MAX220-49 Datasheet by Rochester Electronics, LLC

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General Description
The MAX220–MAX249 family of line drivers/receivers is
intended for all EIA/TIA-232E and V.28/V.24 communications
interfaces, particularly applications where ±12V is not
available.
The MAX225, MAX233, MAX235, and MAX245/MAX246/
MAX247 use no external components and are recommended
for applications where printed circuit board space is critical.
The MAX220-MAX249 are offered in 26 different packages
with temperatures from 0 to +70°C up to -55°C to +125°C.
See ordering information table at the end of the data
sheet for all package and temperature options.
Applications
Interface Translation
Multidrop RS-232 Networks
Portable Diagnostics Equipment
Benefits and Features
Saves Board Space
Integrated Charge Pump Circuitry
Eliminates the Need for a Bipolar ±12V Supply
Enables Single Supply Operation from +5V Supply
Integrated Capacitors (MAX223, MAX233, MAX235,
MAX245–MAX247)
Saves Power for Reduced Power Requirements
5μW Shutdown Mode
19-4323; Rev 18; 5/19
AutoShutdown and UCSP are trademarks of Maxim Integrated
Products, Inc.
Ordering Information and Selection Table appears at end of
data sheet.
TOP VIEW
16
15
14
13
12
11
10
9
1
2
3
4
5
6
7
8
VCC
GND
T1OUT
R1IN
C2+
C1-
V+
C1+
+
MAX220
MAX232
MAX232A R1OUT
T1IN
T2IN
R2OUT
R2IN
T2OUT
V-
C2-
DIP/SO
V+
V-
2+10V
C1+
C1
C2
1
3
4
5
11
10
12
9
6
14
7
13
8
T1IN
R1OUT
T2IN
R2OUT
T1OUT
R1IN
T2OUT
R2IN
+5V INPUT
C2+ -10V
C4
RS-232
OUTPUTS
RS-232
INPUTS
TTL/CMOS
INPUTS
TTL/CMOS
OUTPUTS
GND
15
5k
5k
400k
400k
+5V
+5V
+10V TO -10V
VOLTAGE INVERTER
+5V TO +10V
VOLTAGE DOUBLER
16
C3
C5
CAPACITANCE (µF)
DEVICE
MAX220
MAX232
MAX232A
C1
0.047
1.0
0.1
C2
0.33
1.0
0.1
C3
0.33
1.0
0.1
C4
0.33
1.0
0.1
C5
0.33
1.0
0.1
C2-
C1-
VCC
MAX220–MAX249 +5V-Powered, Multichannel
RS-232 Drivers/Receivers
MAX220/MAX232/MAX232A Pin Configuration and Typical Operating Circuit
Click here for production status of specific part numbers.
(Voltages referenced to GND.)
VCC ..........................................................................-0.3V to +6V
V+ (Note 1) ................................................ (VCC - 0.3V) to +14V
V- (Note 1) .............................................................+0.3V to -14V
Input Voltages
TIN ......................................................... -0.3V to (VCC - 0.3V)
RIN (Except MAX220) .....................................................±30V
RIN (MAX220) .................................................................±25V
TOUT (Except MAX220) (Note 2) ...................................±15V
TOUT (MAX220) ........................................................... ±13.2V
Output Voltages
TOUT ...............................................................................±15V
ROUT .................................................... -0.3V to (VCC + 0.3V)
Driver/Receiver Output Short Circuited to GND ........Continuous
Continuous Power Dissipation (TA = +70°C)
16-Pin Plastic DIP (derate 10.53mW/°C above+70°C) ...842mW
18-Pin Plastic DIP (derate 11.11mW/°C above +70°C) ...889mW
20-Pin Plastic DIP (derate 8.00mW/°C above +70°C) .... 440mW
16-Pin Narrow SO (derate 8.70mW/°C above +70°C) ....696mW
16-Pin Wide SO (derate 9.52mW/°C above +70°C) .......762mW
18-Pin Wide SO (derate 9.52mW/°C above +70°C) .......762mW
20-Pin Wide SO (derate 10.00mW/°C above +70°C) .....800mW
20-Pin SSOP (derate 8.00mW/°C above +70°C) ............ 640mW
16-Pin CERDIP (derate 10.00mW/°C above +70°C) ......800mW
18-Pin CERDIP (derate 10.53mW/°C above +70°C) ......842mW
Operating Temperature Ranges
MAX2_ _AC_ _, MAX2_ _C_ _ ..........................0°C to +70°C
MAX2_ _AE_ _, MAX2_ _E_ _ ...................... -40°C to +85°C
MAX2_ _AM_ _, MAX2_ _M_ _ ................... -55°C to +125°C
Storage Temperature Range ............................ -65°C to +160°C
Lead Temperature (soldering, 10s) .................................+300°C
Soldering Temperature (reflow)
20 PDIP (P20M+1) ......................................................+225°C
All other lead(Pb)-free packages ................................. +260°C
All other packages containing lead(Pb) .......................+240°C
(VCC = +5V ±10%, C1–C4 = 0.1μF‚ MAX220, C1 = 0.047μF, C2–C4 = 0.33μF, TA = TMIN to TMAXunless otherwise noted.) (Note 3)
Note 1: For the MAX220, V+ and V- can have a maximum magnitude of 7V, but their absolute difference cannot exceed 13V.
Note 2: Input voltage measured with TOUT in high-impedance state, VSHDN or VCC = 0V.
PARAMETER CONDITIONS MIN TYP MAX UNITS
RS-232 TRANSMITTERS
Output Voltage Swing All transmitter outputs loaded with 3kΩ to GND ±5 ±8 V
Input Logic-Low Voltage 1.4 0.8 V
Input Logic-High Voltage All devices except MAX220 2 1.4 V
MAX220: VCC = +5.0V 2.4
Logic Pullup/lnput Current
All except MAX220, normal operation 5 40
µA
VSHDN = 0V, MAX222/MAX242, shutdown, MAX220 ±0.01 ±1
Output Leakage Current
VCC = +5.5V, VSHDN = 0V, VOUT = ±15V, MAX222/
MAX242 ±0.01 ±10
µA
VCC = VSHDN = 0V VOUT = ±15V ±0.01 ±10
MAX220, VOUT = ±12V ±25
Data Rate 200 116 kbps
Transmitter Output Resistance VCC = V+ = V- = 0V, VOUT = ±2V 300 10M Ω
Output Short-Circuit Current VOUT = 0V VOUT = 0V ±7 ±22 mA
MAX220 ±60
RS-232 RECEIVERS
RS-232 Input Voltage Operating Range ±30 V
MAX220 ±25
RS-232 Input Threshold Low VCC = +5V All except MAX243 R2IN 0.8 1.3 V
MAX243 R2IN (Note 4) -3
RS-232 Input Threshold High VCC = +5V All except MAX243 R2IN 1.8 2.4 V
MAX243 R2IN (Note 4) -0.5 -0.1
MAX220–MAX249 +5V-Powered, Multichannel
RS-232 Drivers/Receivers
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2
Absolute Maximum Ratings—MAX220/222/232A/233A/242/243
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these
or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect
device reliability.
Electrical Characteristics—MAX220/222/232A/233A/242/243
(VCC = +5V ±10%, C1–C4 = 0.1μF‚ MAX220, C1 = 0.047μF, C2–C4 = 0.33μF, TA = TMIN to TMAXunless otherwise noted.) (Note 3)
PARAMETER CONDITIONS MIN TYP MAX UNITS
RS-232 Input Hysteresis
All except MAX220/MAX243, VCC = +5V, no
hysteresis in shutdown 0.2 0.5 1.0
V
MAX220 0.3
MAX243 1
RS-232 Input Resistance TA = +25°C (MAX220) 357
357
TTL/CMOS Output Voltage Low IOUT = 3.2mA 0.2 0.4 V
IOUT = 1.6mA (MAX220) 0.4
TTL/CMOS Output Voltage High IOUT = -1.0mA 3.5 VCC -
0.2 V
TTL/CMOS Output Short-Circuit Current Sourcing VOUT = VGND -2 -10 mA
Sinking VOUT = VCC 10 30
TTL/CMOS Output Leakage Current VSHDN = VCC or VEN = VCC (VSHDN = 0V for
MAX222), 0V ≤ VOUT ≤ VCC ±0.05 ±10 µA
EN Input Threshold Low MAX242 1.4 0.8 V
EN Input Threshold High MAX242 2.0 1.4 V
Supply Voltage Range 4.5 5.5 V
VCC Supply Current (VSHDN = VCC),
Figures 5, 6, 11, 19
No load
MAX220 0.5 2
mA
MAX222/MAX232A/MAX233A/
MAX242/MAX243 4 10
3kΩ load
both inputs
MAX220 12
MAX222/MAX232A/MAX233A/
MAX242/MAX243 15
Shutdown Supply Current MAX222/
MAX242
TA = +25°C 0.1 10
µA
TA = 0°C to +70°C 2 50
TA = -40°C to +85°C 2 50
TA = -55°C to +125°C 35 100
SHDN Input Leakage Current MAX222/MAX242 ±1 µA
SHDN Threshold Low MAX222/MAX242 1.4 0.8 V
SHDN Threshold High MAX222/MAX242 2.0 1.4 V
Transition Slew Rate
CL = 50pF to 2500pF,
RL = 3kΩ to 7kΩ, VCC
= +5V, TA = +25°C,
measured from +3V to
-3V or -3V to +3V
MAX222/MAX232A/
MAX233/MAX242/MAX243 6 12 30
V/µs
MAX220 1.5 3 30.0
Transmitter Propagation Delay TLL to
RS-232 (Normal Operation)
tPHLT, Figure 1
MAX222/MAX232A/
MAX233/MAX242/MAX243 1.3 3.5
µs
MAX220 4 10
tPLHT, Figure 1
MAX222/MAX232A/
MAX233/MAX242/MAX243 1.5 3.5
MAX220 5 10
MAX220–MAX249 +5V-Powered, Multichannel
RS-232 Drivers/Receivers
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3
Electrical Characteristics—MAX220/222/232A/233A/242/243 (continued)
OUTPUTVOLTAGE (V) OUTPUT CURRENTWA) OUTPUT LoAu CURREN FLOWS FROM v. TD v7 ALL CAPS VCC : .5 25v ALL CAPS u M van : a 75v v. VAVULTAGE (v)
(VCC = +5V ±10%, C1–C4 = 0.1μF‚ MAX220, C1 = 0.047μF, C2–C4 = 0.33μF, TA = TMIN to TMAXunless otherwise noted.) (Note 3)
Note 3: All units are production tested at hot. Specifications over temperature are guaranteed by design.
Note 4: MAX243 R2OUT is guaranteed to be low when R2IN ≥ 0V or is unconnected.
PARAMETER CONDITIONS MIN TYP MAX UNITS
Receiver Propagation Delay RS-232 to TLL
(Normal Operation)
tPHLR, Figure 2
MAX222/MAX232A/MAX233/
MAX242/MAX243 0.5 1
µs
MAX220 0.6 3
tPLHR, Figure 2
MAX222/MAX232A/MAX233/
MAX242/MAX243 0.6 1
MAX220 0.8 3
Receiver Propagation Delay RS-232 to TLL
(Shutdown)
tPHLS, Figure 2 MAX242 0.5 10 µs
tPHLS, Figure 2 MAX242 2.5 10
Receiver-Output Enable Time tER MAX242, Figure 3 125 500 ns
Receiver-Output Disable Time tDR MAX242, Figure 3 160 500 ns
Transmitter-Output Enable Time
(SHDN Goes High) tET
MAX222/MAX242, 0.1µF caps
(includes charge-pump start-
up), Figure 4
250 µs
Transmitter-Output Disable Time
(SHDN Goes Low) tDT MAX222/MAX242,
0.1µF caps, Figure 4 600 ns
Transmitter + to - Propagation Delay
Difference (Normal Operation) tPHLT - tPLHT
MAX222/MAX232A/MAX233/
MAX242/MAX243 300 ns
MAX220 2000
Receiver + to - Propagation Delay
Difference (Normal Operation) tPHLR - tPLHR
MAX222/MAX232A/MAX233/
MAX242/MAX243 100 ns
MAX220 225
11
10
4
0 10 40 60
AVAILABLE OUTPUT CURRENT
vs. DATA RATE
6
5
7
9
8
MAX220-02
DATA RATE (kb/s)
OUTPUT CURRENT (mA)
20 30 50
OUTPUT LOAD CURRENT
FLOWS FROM V+ TO V-
VCC = +5.25V
ALL CAPS
1µF
ALL CAPS
0.1µF VCC = +4.75V
+10V
-10V
MAX222/MAX242
ON-TIME EXITING SHUTDOWN
+5V
+5V
0V
0V
MAX220-03
500ms/div
V+, V- VOLTAGE (V)
1µF CAPS V+
V+
V-
V-
SHDN
0.1µF CAPS
1µF CAPS
0.1µF CAPS
10
8
-10
0 5 15 25
OUTPUT VOLTAGE vs. LOAD CURRENT
-4
-6
-8
-2
6
4
2
MAX220-01
LOAD CURRENT (mA)
OUTPUT VOLTAGE (V)
10
0
20
0.1µF
EITHER V+ OR V- LOADED
VCC = +5V
NO LOAD ON
TRANSMITTER OUTPUTS
(EXCEPT MAX220, MAX233A)
V- LOADED, NO LOAD ON V+
V+ LOADED, NO LOAD ON V-
F
1µF
0.1µF
MAX220–MAX249 +5V-Powered, Multichannel
RS-232 Drivers/Receivers
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4
Electrical Characteristics—MAX220/222/232A/233A/242/243 (continued)
Typical Operating Characteristics
MAX220/MAX222/MAX232A/MAX233A/MAX242/MAX243
(Voltages referenced to GND.)
VCC ..........................................................................-0.3V to +6V
V+ .............................................................. (VCC - 0.3V) to +14V
V- ........................................................................... +0.3V to -14V
Input Voltages
TIN ........................................................ -0.3V to (VCC + 0.3V)
RIN...................................................................................±30V
Output Voltages
TOUT ...............................................(V+ + 0.3V) to (V- - 0.3V)
ROUT .................................................... -0.3V to (VCC + 0.3V)
Short-Circuit Duration, TOUT to GND .......................Continuous
Continuous Power Dissipation (TA = +70°C)
14-Pin Plastic DIP (derate 10.00mW/°C above +70°C) ... 800mW
16-Pin Plastic DIP (derate 10.53mW/°C above +70°C) ... 842mW
20-Pin Plastic DIP (derate 11.11mW/°C above +70°C) .... 889mW
24-Pin Narrow Plastic DIP
(derate 13.33mW/°C above +70°C) ..............................1.07W
24-Pin Plastic DIP (derate 9.09mW/°C above +70°C) 500mW
16-Pin Wide SO (derate 9.52mW/°C above +70°C) ...762mW
20-Pin Wide SO (derate 10.00mW/°C above +70°C) .800mW
24-Pin Wide SO (derate 11.76mW/°C above +70°C) .. 941mW
28-Pin Wide SO (derate 12.50mW/°C above +70°C) ........1W
44-Pin Plastic FP (derate 11.11mW/°C above +70°C) 889mW
14-Pin CERDIP (derate 9.09mW/°C above +70°C) ....727mW
16-Pin CERDIP (derate 10.00mW/°C above +70°C) ..800mW
20-Pin CERDIP (derate 11.11mW/°C above +70°C) ...889mW
24-Pin Narrow CERDIP
(derate 12.50mW/°C above +70°C) ...................................1W
24-Pin Sidebraze (derate 20.0mW/°C above +70°C) ........ 1.6W
28-Pin SSOP (derate 9.52mW/°C above +70°C) ............. 762mW
Operating Temperature Ranges
MAX2 _ _ C _ _ ..................................................0°C to +70°C
MAX2 _ _ E _ _ .............................................. -40°C to +85°C
MAX2 _ _ M _ _ ........................................... -55°C to +125°C
Storage Temperature Range ............................ -65°C to +160°C
Lead Temperature (soldering, 10s) .................................+300°C
Soldering Temperature (reflow)
20 PDIP (P20M+1) ......................................................+225°C
24 PDIP (P24M-1) .......................................................+225°C
All other lead(Pb)-free packages ................................. +260°C
All other packages containing lead(Pb) .......................+240°C
(MAX223/230/232/234/236/237/238/240/241, VCC = +5V ±10%; MAX233/MAX235, VCC = +5V ±5%‚ C1–C4 = 1.0μF;
MAX231/MAX239, VCC = +5V ±10%; V+ = +7.5V to +13.2V; TA = TMIN to TMAX; unless otherwise noted.) (Note 5)
PARAMETER CONDITIONS MIN TYP MAX UNITS
Output Voltage Swing All transmitter outputs loaded with 3kΩ to ground ±5.0 ±7.3 V
VCC Supply Current No load,
TA = +25°C
MAX232/233 5 10
mAMAX223/230/234–238/240/241 7 15
MAX231/239 0.4 1
V+ Supply Current MAX231 1.8 5 mA
MAX239 5 15
Shutdown Supply Current TA = +25°C MAX223 15 50 µA
MAX230/235/236/240/241 1 10
Input Logic-Low Voltage TIN, EN, SHDN (MAX233); EN, SHDN (MAX230/235–241) 0.8 V
Input Logic-High Voltage
TIN 2.0
V
EN, SHDN (MAX223);
EN, SHDN (MAX230/235/236/240/241) 2.4
Logic Pullup Current VTIN = 0V 1.5 200 µA
Receiver Input Voltage
Operating Range -30 +30 V
MAX220–MAX249 +5V-Powered, Multichannel
RS-232 Drivers/Receivers
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5
Absolute Maximum Ratings—MAX223/MAX230–MAX241
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these
or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect
device reliability.
Electrical Characteristics—MAX223/MAX230–MAX241
(MAX223/230/232/234/236/237/238/240/241, VCC = +5V ±10%; MAX233/MAX235, VCC = +5V ±5%‚ C1–C4 = 1.0μF;
MAX231/MAX239, VCC = +5V ±10%; V+ = +7.5V to +13.2V; TA = TMIN to TMAX; unless otherwise noted.) (Note 5)
Note 5: All units are production tested at hot except for the MAX240, which is production tested at TA = +25°C. Specifications over
temperature are guaranteed by design.
PARAMETER CONDITIONS MIN TYP MAX UNITS
RS-232 Input Logic-Low Voltage TA = +25°C,
VCC = +5V
Normal operation
VSHDN = +5V (MAX223)
VSHDN = 0V (MAX235/236/240/241)
0.8 1.2
V
Shutdown (MAX223)
VSHDN = 0V,
VEN = +5V (R4IN, R5IN)
0.6 1.5
RS-232 Input Logic-High Voltage TA = +25°C,
VCC = +5V
Normal operation
VSHDN = 5V (MAX223)
VSHDN = 0V (MAX235/236/240/241)
1.7 2.4
V
Shutdown (MAX223)
VSHDN = 0V,
VEN = +5V (R4IN‚ R5IN)
1.5 2.4
RS-232 Input Hysteresis VCC = +5V, no hysteresis in shutdown 0.2 0.5 1.0 V
RS-232 Input Resistance TA = +25°C, VCC = +5V 3 5 7
TTL/CMOS Output Voltage Low IOUT = 1.6mA (MAX231/232/233, IOUT = 3.2mA) 0.4 V
TTL/CMOS Output Voltage High IOUT = -1mA 3.5 VCC
- 0.4 V
TTL/CMOS Output Leakage
Current
0V ≤ ROUT ≤ VCC; VEN = 0V (MAX223);
VEN = VCC (MAX235–241) ±0.05 ±10 µA
Receiver Output Enable Time Normal
operation
MAX223 600 ns
MAX235/236/239/240/241 400
Receiver Output Disable TimeNormal
operation
MAX223 900 ns
MAX235/236/239/240/241 250
Propagation Delay
RS-232 IN to
TTL/CMOS OUT,
CL = 150pF
Normal operation 0.5 10
µs
VSHDN = 0V
(MAX223)
tPHLS 4 40
tPLHS 6 40
Transition Region Slew Rate
MAX223/MAX230/MAX234–241, TA = +25°C, VCC = +5V,
RL = 3kΩ to 7kΩ‚ CL = 50pF to 2500pF, measured from
+3V to -3V or -3V to +3V
3 5.1 30
V/μs
MAX231/MAX232/MAX233, TA = +25°C, VCC = +5V,
RL = 3kΩ to 7kΩ, CL = 50pF to 2500pF, measured from
+3V to -3V or -3V to +3V
4 30
Transmitter Output Resistance VCC = V+ = V- = 0V, VOUT = ±2V 300 Ω
Transmitter Output Short-Circuit
Current ±10 mA
MAX220–MAX249 +5V-Powered, Multichannel
RS-232 Drivers/Receivers
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6
Electrical Characteristics—MAX223/MAX230–MAX241 (continued)
E L 2 IRANSMWERS LOADED LTRANSMWER LDADED STRANS V MWERS LOADED A TRANSMDIERS LOADED L tTRANSr TA 25% MmERs CH‘A wF LDADED ’TRANSMLWER LOADS: amuzmupE 7‘ wk 1 TRANS MmER LOADED ,2 TRANS;3 TRANS MLITERS MWERS LOADED LOADED VON {V1 RS LDADED VOL (V) W, V- WHEN EXITING SHUTDOWN ‘SHUTDOWN PDLARLW Ls FOR NDN MAXZM PARTS SLEW RATE (ws) Vv‘ v- (v) TA Vcc LO c L L ZTRANSM LOADED M TERS TRANSMWERS OADED u : 45% v7 LD
7.4
6.0
0 2500
TRANSMITTER OUTPUT VOLTAGE (VOH)
vs. LOAD CAPACITANCE AT
DIFFERENT DATA RATES
6.4
6.2
7.2
7.0
MAX220-05
LOAD CAPACITANCE (pF)
VOH (V)
15001000500 2000
6.8
6.6
160kb/s
80kb/s
20kb/s
TA = +25°C
VCC = +5V
3 TRANSMITTERS LOADED
RL = 3k
C1–C4 = 1µF
12.0
4.0
0 2500
TRANSMITTER SLEW RATE
vs. LOAD CAPACITANCE
6.0
5.0
11.0
9.0
10.0
MAX220-06
LOAD CAPACITANCE (pF)
SLEW RATE (V/µs)
15001000500 2000
8.0
7.0
TA = +25°C
VCC = +5V
LOADED, RL = 3k
C1–C4 = 1µF
1 TRANSMITTER LOADED
2 TRANSMITTERS
LOADED
3 TRANSMITTERS
LOADED
4 TRANSMITTERS
LOADED
-6.0
-9.0
4.5 5.5
TRANSMITTER OUTPUT
VOLTAGE (VOL) vs. VCC
-8.0
-8.5
-6.5
-7.0
MAX220-07
VCC (V)
V
OL
(V)
5.0
-7.5
4 TRANS-
MITTERS
LOADED
TA = +25°C
C1–C4 = 1µF
TRANSMITTER
LOADS =
3k || 2500pF
1 TRANS-
MITTER
LOADED
2 TRANS-
MITTERS
LOADED
3 TRANS-
MITTERS
LOADED
-6.0
-7.6
0 2500
TRANSMITTER OUTPUT VOLTAGE (V
OL
)
vs. LOAD CAPACITANCE AT
DIFFERENT DATA RATES
-7.0
-7.2
-7.4
-6.2
-6.4
MAX220-08
LOAD CAPACITANCE (pF)
VOL (V)
15001000500 2000
-6.6
-6.8 160kb/s
80kb/s
20kb/s
TA = +25°C
VCC = +5V
3 TRANSMITTERS LOADED
RL = 3k
C1–C4 = 1µF
10
-10
0 5 10 15 20 25 30 35 40 45 50
TRANSMITTER OUTPUT VOLTAGE (V+, V-)
vs. LOAD CURRENT
-2
-6
-4
-8
8
6
MAX220-09
CURRENT (mA)
V+, V- (V)
4
2
0
V+ AND V-
EQUALLY
LOADED
V- LOADED,
NO LOAD
ON V+
TA = +25°C
VCC = +5V
C1–C4 = 1µF
ALL TRANSMITTERS UNLOADED
V+ LOADED,
NO LOAD
ON V-
8.5
6.5
4.5 5.5
TRANSMITTER OUTPUT
VOLTAGE (VOH) vs. VCC
7.0
8.0
MAX220-04
VCC (V)
V
OH
(V)
5.0
7.5
1 TRANSMITTER
LOADED 3 TRANS-
MITTERS
LOADED
4 TRANSMITTERS
LOADED
2 TRANSMITTERS
LOADED
TA = +25°C
C1–C4 = 1µF
TRANSMITTER
LOADS =
3k || 2500pF
*SHUTDOWN POLARITY IS REVERSED
FOR NON MAX241 PARTS
V+, V- WHEN EXITING SHUTDOWN
(1µF CAPACITORS)
MAX220-13
VSHDN*
V-
O
V+
500ms/div
MAX220–MAX249 +5V-Powered, Multichannel
RS-232 Drivers/Receivers
Maxim Integrated
7
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Typical Operating Characteristics
MAX223/MAX230–MAX241
(Voltages referenced to GND.)
Supply Voltage (VCC) ..............................................-0.3V to +6V
Input Voltages
TIN‚ ENA, ENB, ENR, ENT, ENRA,
ENRB, ENTA, ENTB ............................. -0.3V to (VCC + 0.3V)
RIN...................................................................................±25V
TOUT (Note 6) .................................................................±15V
ROUT .................................................... -0.3V to (VCC + 0.3V)
Short Circuit Duration (one output at a time)
TOUT to GND ........................................................ Continuous
ROUT to GND .......................................................Continuous
Continuous Power Dissipation (TA = +70°C)
28-Pin Wide SO (derate 12.50mW/°C above +70°C) ........1W
40-Pin Plastic DIP (derate 11.11mW/°C above +70°C) 611mW
44-Pin PLCC (derate 13.33mW/°C above +70°C) ........1.07W
Operating Temperature Ranges
MAX225C_ _, MAX24_C_ _ ............................... 0°C to +70°C
MAX225E_ _, MAX24_E_ _ .......................... -40°C to +85°C
Storage Temperature Range ............................ -65°C to +160°C
Lead Temperature (soldering,10s)) .................................+300°C
Soldering Temperature (reflow)
40 PDIP (P40M-2) .......................................................+225°C
All other lead(Pb)-free packages ................................. +260°C
All other packages containing lead(Pb) .......................+240°C
(MAX225, VCC = +5.0V ±5%; MAX244–MAX249, VCC = +5.0V ±10%, external capacitors C1–C4 = 1μF; TA = TMIN to TMAX; unless
otherwise noted.) (Note 7)
Note 6: Input voltage measured with transmitter output in a high-impedance state, shutdown, or VCC = 0V.
PARAMETER CONDITIONS MIN TYP MAX UNITS
RS-232 TRANSMITTERS
Input Logic-Low Voltage 1.4 0.8 V
Input Logic-High Voltage 2 1.4 V
Logic Pullup/lnput Current Tables 1a–1d Normal operation 10 50 μA
Shutdown ±0.01 ±1
Data Rate Tables 1a–1d, normal operation 120 64 kbps
Output Voltage Swing All transmitter outputs loaded with 3kΩ to GND ±5 ±7.5 V
Output Leakage Current (Shutdown) Tables 1a–1d
VENA, VENB, VENT, VENTA,
VENTB = VCC, VOUT = ±15V ±0.01 ±25 μA
VCC = 0V, VOUT = ±15V ±0.01 ±25
Transmitter Output Resistance VCC = V+ = V- = 0V, VOUT = ±2V (Note 8) 300 10M Ω
Output Short-Circuit Current VOUT = 0V ±7 ±30 mA
RS-232 RECEIVERS
RS-232 Input Voltage Operating Range ±25 V
RS-232 Input Logic-Low Voltage VCC = +5V 0.8 1.3 V
RS-232 Input Logic-High Voltage VCC = +5V 1.8 2.4 V
RS-232 Input Hysteresis VCC = +5V 0.2 0.5 1.0 V
RS-232 Input Resistance 3 5 7
TTL/CMOS Output Voltage Low IOUT = 3.2mA 0.2 0.4 V
TTL/CMOS Output Voltage High IOUT = -1.0mA 3.5 VCC -
0.2 V
TTL/CMOS Output Short-Circuit Current Sourcing VOUT = VGND -2 -10 mA
Sinking VOUT = VCC 10 30
TTL/CMOS Output Leakage Current Normal operation, outputs disabled,
Tables 1a–1d, 0V ≤ VOUT ≤ VCC, VENR_ = VCC
±0.05 ±0.10 μA
MAX220–MAX249 +5V-Powered, Multichannel
RS-232 Drivers/Receivers
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Absolute Maximum Ratings—MAX225/MAX244–MAX249
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these
or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect
device reliability.
Electrical Characteristics—MAX225/MAX244–MAX249
(MAX225, VCC = +5.0V ±5%; MAX244–MAX249, VCC = +5.0V ±10%, external capacitors C1–C4 = 1μF; TA = TMIN to TMAX; unless
otherwise noted.) (Note 7)
Note 7: All units production tested at hot. Specifications over temperature are guaranteed by design.
Note 8: The 300Ω minimum specification complies with EIA/TIA-232E, but the actual resistance when in shutdown mode or VCC =
0V is 10MΩ as is implied by the leakage specification.
PARAMETER CONDITIONS MIN TYP MAX UNITS
POWER SUPPLY AND CONTROL LOGIC
Supply Voltage Range MAX225 4.75 5.25 V
MAX244–MAX249 4.5 5.5
VCC Supply Current
(Normal Operation)
No load MAX225 10 20
mA
MAX244–MAX249 11 30
3kΩ loads on
all outputs
MAX225 40
MAX244–MAX249 57
Shutdown Supply Current TA = +25°C 8 25
TA = TMIN to TMAX 50
Control Input
Leakage current ±1 µA
Logic-low voltage 1.4 0.8 V
Logic-high voltage 2.4 1.4
AC CHARACTERISTICS
Transition Slew Rate CL = 50pF to 2500pF, RL = 3kΩ to 7kΩ, VCC = +5V,
TA = +25°C, measured from +3V to -3V or -3V to +3V 5 10 30 V/μs
Transmitter Propagation Delay
TLL to RS-232 (Normal Operation)
tPHLT, Figure 1 1.3 3.5 µs
tPLHT, Figure 1 1.3 3.5
Receiver Propagation Delay
TLL to RS-232 (Normal Operation)
tPHLR, Figure 2 0.6 1.5 µs
tPLHR, Figure 2 0.6 1.5
Receiver Propagation Delay
TLL to RS-232 (Low-Power Mode)
tPHLS, Figure 2 0.6 1.5 µs
tPLHS, Figure 2 0.6 10
Transmitter + to - Propagation
Delay Difference (Normal Operation) tPHLT - tPLHT 350 ns
Receiver + to - Propagation
Delay Difference (Normal Operation) tPHLR - tPLHR 350 ns
Receiver-Output Enable Time tER, Figure 3 100 500 ns
Receiver-Output Disable Time tDR, Figure 3 100 500 ns
Transmitter Enable Time tET
MAX246–MAX249
(excludes charge-pump startup) 5 µs
MAX225/MAX245–MAX249
(includes charge-pump startup) 10 ms
Transmitter Disable Time tDT, Figure 4 100 ns
MAX220–MAX249 +5V-Powered, Multichannel
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Electrical Characteristics—MAX225/MAX244–MAX249 (continued)
VD: : .sv WLTH ALL IRANSMLWERS DRLVEN OADED WLTH 5m v. AND v7 LOADED ELTHER v. >- > TRANSMLWER SLEW RATE ( W V. AND v7 LOAD v. LOADED
10
-10
0 5 10 15 20 25 30 35
OUTPUT VOLTAGE
vs. LOAD CURRENT FOR V+ AND V-
-2
-4
-6
-8
8
MAX220-11
LOAD CURRENT (mA)
OUTPUT VOLTAGE (V)
6
4
2
0
V+ AND V- LOADED
EITHER V+ OR
V- LOADED
V+ AND V- LOADED
VCC = +5V
EXTERNAL CHARGE PUMP
1µF CAPACITORS
8 TRANSMITTERS
DRIVING 5k AND
2000pF AT 20kb/s V- LOADED
V+ LOADED
9.0
5.0
0123 4 5
TRANSMITTER OUTPUT VOLTAGE (V+, V-)
vs. LOAD CAPACITANCE AT
DIFFERENT DATA RATES
6.0
5.5
8.5
MAX220-12
LOAD CAPACITANCE (nF)
V+, V- (V)
8.0
7.5
7.0
6.5
VCC = +5V WITH ALL TRANSMITTERS DRIVEN
LOADED WITH 5k
40kb/s
60kb/s
100kb/s
200kb/s
ALL CAPACITIORS 1µF
10kb/s
20kb/s
18
2
0 1 2 3 4 5
TRANSMITTER SLEW RATE
vs. LOAD CAPACITANCE
8
6
4
16
MAX220-10
LOAD CAPACITANCE (nF)
TRANSMITTER SLEW RATE (V/µs)
14
12
10
VCC = +5V
EXTERNAL POWER SUPPLY
1µF CAPACITORS
40kb/s DATA RATE
8 TRANSMITTERS
LOADED WITH 3k
MAX220–MAX249 +5V-Powered, Multichannel
RS-232 Drivers/Receivers
Maxim Integrated
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Typical Operating Characteristics
MAX225/MAX244–MAX249
Figure 1. Transmitter Propagation-Delay Timing
Figure 3. Receiver-Output Enable and Disable Timing
Figure 2. Receiver Propagation-Delay Timing
Figure 4. Transmitter-Output Disable Timing
INPUT
OUTPUT
+3V
V+
0V
V-
0V
tPLHT tPHLT
EN
RX IN
a) TEST CIRCUIT
b) ENABLE TIMING
c) DISABLE TIMING
EN INPUT
RECEIVER
OUTPUTS
RX OUT
RX
1k
0V
+3V
EN
EN
+0.8V
+3.5V
OUTPUT ENABLE TIME (tER)
VCC - 2V
VOL + 0.5V
VOH - 0.5V
OUTPUT DISABLE TIME (tDR)
VCC - 2V
+3V
0V
150pF
EN INPUT
VOH
RECEIVER
OUTPUTS
VOL
tPHLR
tPHLS
tPLHR
tPLHS
50%
VCC
50%
+3V
50%
INPUT
OUTPUT
*EXCEPT FOR R2 ON THE MAX243
WHERE -3V IS USED.
0V*
50%
GND
1 OR 0 TX
3k50pF
-5V
+5V
OUTPUT DISABLE TIME (tDT)
V+
SHDN +3V
0V
V-
0V
a) TIMING DIAGRAM
b) TEST CIRCUIT
MAX220–MAX249 +5V-Powered, Multichannel
RS-232 Drivers/Receivers
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Test Circuits/Timing Diagrams
Table 1a. MAX245 Control Pin Configurations
Table 1b. MAX245 Control Pin Configurations
Table 1c. MAX246 Control Pin Configurations
ENT ENR OPERATION STATUS TRANSMITTERS RECEIVERS
0 0 Normal Operation All Active All Active
0 1 Normal Operation All Active All High-Z
1 0 Shutdown All High-Z All Low-Power Receive Mode
1 1 Shutdown All High-Z All High-Z
ENT ENR OPERATION
STATUS
TRANSMITTERS RECEIVERS
TA1–TA4 TB1–TB4 RA1–RA5 RB1–RB5
0 0 Normal Operation All Active All Active All Active All Active
0 1 Normal Operation All Active All Active RA1–RA4 High-Z,
RA5 Active
RA1–RA4 High-Z,
RA5 Active
1 0 Shutdown All High-Z All High-Z All Low-Power
Receive Mode
All Low-Power
Receive Mode
1 1 Shutdown All High-Z All High-Z
RA1–RA4 High-Z,
RA5 Low-Power
Receive Mode
RA1–RA4 High-Z,
RA5 Low-Power
Receive Mode
ENA ENB OPERATION
STATUS
TRANSMITTERS RECEIVERS
TA1–TA4 TB1–TB4 RA1–RA5 RB1–RB5
0 0 Normal Operation All Active All Active All Active All Active
0 1 Normal Operation All Active All Active All Active RA1–RA4 High-Z,
RA5 Active
1 0 Shutdown All High-Z All High-Z RA1–RA4 High-Z,
RA5 Active
All Low-Power
Receive Mode
1 1 Shutdown All High-Z All High-Z
RA1–RA4 High-Z,
RA5 Low-Power
Receive Mode
RA1–RA4 High-Z,
RA5 Low-Power
Receive Mode
MAX220–MAX249 +5V-Powered, Multichannel
RS-232 Drivers/Receivers
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Control Pin Configuration Tables
Table 1d. MAX247/MAX248/MAX249 Control Pin Configurations
ENTA ENTB ENRA ENRB OPERATION
STATUS
TRANSMITTERS RECEIVERS
MAX247 TA1–TA4 TB1–TB4 RA1–RA4 RB1–RB5
MAX248 TA1–TA4 TB1–TB4 RA1–RA4 RB1–RB4
MAX249 TA1–TA3 TB1–TB3 RA1–RA5 RB1–RB5
0 0 0 0 Normal Operation All Active All Active All Active All Active
0 0 0 1 Normal Operation All Active All Active All Active
All High-Z, except
RB5 stays active on
MAX247
0 0 1 0 Normal Operation All Active All Active All High-Z All Active
0 0 1 1 Normal Operation All Active All Active All High-Z
All High-Z, except
RB5 stays active on
MAX247
0 1 0 0 Normal Operation All Active All High-Z All Active All Active
0 1 0 1 Normal Operation All Active All High-Z All Active
All High-Z, except
RB5 stays active on
MAX247
0 1 1 0 Normal Operation All Active All High-Z All High-Z All Active
0 1 1 1 Normal Operation All Active All High-Z All High-Z
All High-Z, except
RB5 stays active on
MAX247
1 0 0 0 Normal Operation All High-Z All Active All Active All Active
1 0 0 1 Normal Operation All High-Z All Active All Active
All High-Z, except
RB5 stays active on
MAX247
1 0 1 0 Normal Operation All High-Z All Active All High-Z All Active
1 0 1 1 Normal Operation All High-Z All Active All High-Z
All High-Z, except
RB5 stays active on
MAX247
1 1 0 0 Shutdown All High-Z All High-Z Low-Power
Receive Mode
Low-Power
Receive Mode
1 1 0 1 Shutdown All High-Z All High-Z Low-Power
Receive Mode
All High-Z, except
RB5 stays active on
MAX247
1 1 1 0 Shutdown All High-Z All High-Z All High-Z Low-Power
Receive Mode
1 1 1 1 Shutdown All High-Z All High-Z All High-Z
All High-Z, except
RB5 stays active on
MAX247
MAX220–MAX249 +5V-Powered, Multichannel
RS-232 Drivers/Receivers
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Detailed Description
The MAX220–MAX249 contain four sections: dual charge-
pump DC-DC voltage converters, RS-232 drivers, RS-232
receivers, and receiver and transmitter enable control
inputs.
Dual Charge-Pump Voltage Converter
The MAX220–MAX249 have two internal charge-pumps
that convert +5V to ±10V (unloaded) for RS-232 driver
operation. The first converter uses capacitor C1 to double
the +5V input to +10V on C3 at the V+ output. The second
converter uses capacitor C2 to invert +10V to -10V on C4
at the V- output.
A small amount of power may be drawn from the +10V
(V+) and -10V (V-) outputs to power external circuitry (see
the Typical Operating Characteristics section), except on
the MAX225 and MAX245–MAX247, where these pins
are not available. V+ and V- are not regulated, so the
output voltage drops with increasing load current. Do not
load V+ and V- to a point that violates the minimum ±5V
EIA/TIA-232E driver output voltage when sourcing current
from V+ and V- to external circuitry.
When using the shutdown feature in the MAX222,
MAX225, MAX230, MAX235, MAX236, MAX240,
MAX241, and MAX245–MAX249, avoid using V+ and Vto
power external circuitry. When these parts are shut down,
V- falls to 0V, and V+ falls to +5V. For applications where
a +10V external supply is applied to the V+ pin (instead of
using the internal charge pump to generate +10V), the C1
capacitor must not be installed and the SHDN pin must be
connected to VCC. This is because V+ is internally con-
nected to VCC in shutdown mode.
RS-232 Drivers
The typical driver output voltage swing is ±8V when load-
ed with a nominal 5kΩ RS-232 receiver and VCC = +5V.
Output swing is guaranteed to meet the EIA/TIA-232E
and V.28 specification, which calls for ±5V minimum driver
output levels under worst-case conditions. These include
a minimum 3kΩ load, VCC = +4.5V, and maximum oper-
ating temperature. Unloaded driver output voltage ranges
from (V+ -1.3V) to (V- +0.5V).
Input thresholds are both TTL and CMOS compatible. The
inputs of unused drivers can be left unconnected since
400kΩ input pullup resistors to VCC are built in (except
for the MAX220). The pullup resistors force the outputs of
unused drivers low because all drivers invert. The internal
input pullup resistors typically source 12μA, except in
shutdown mode where the pullups are disabled. Driver
outputs turn off and enter a high-impedance state—where
leakage current is typically microamperes (maximum
25μA)—when in shutdown mode, in three-state mode, or
when device power is removed. Outputs can be driven
to ±15V. The powersupply current typically drops to 8μA
in shutdown mode. The MAX220 does not have pullup
resistors to force the outputs of the unused drivers low.
Connect unused inputs to GND or VCC.
The MAX239 has a receiver three-state control line, and
the MAX223, MAX225, MAX235, MAX236, MAX240, and
MAX241 have both a receiver three-state control line and
a low-power shutdown control. Table 2 shows the effects
of the shutdown control and receiver three-state control
on the receiver outputs.
The receiver TTL/CMOS outputs are in a high-imped-
ance, three-state mode whenever the three-state enable
line is high (for the MAX225/MAX235/MAX236/MAX239–
MAX241), and are also high-impedance whenever the
shutdown control line is high.
When in low-power shutdown mode, the driver outputs
are turned off and their leakage current is less than 1μA
with the driver output pulled to ground. The driver output
leakage remains less than 1μA, even if the transmitter
output is backdriven between 0V and (VCC + 6V). Below
-0.5V, the transmitter is diode clamped to ground with
1kΩ series impedance. The transmitter is also zener
clamped to approximately VCC + 6V, with a series imped-
ance of 1kΩ.
The driver output slew rate is limited to less than 30V/
μs as required by the EIA/TIA-232E and V.28 specifica-
tions. Typical slew rates are 24V/μs unloaded and 10V/μs
loaded with 3Ω and 2500pF.
RS-232 Receivers
EIA/TIA-232E and V.28 specifications define a voltage
level greater than 3V as a logic 0, so all receivers invert.
Input thresholds are set at 0.8V and 2.4V, so receivers
respond to TTL level inputs as well as EIA/TIA-232E and
V.28 levels.
Table 2. Three-State Control of Receivers
PART SHDN SHDN EN EN(R) RECEIVERS
MAX223 —
Low
High
High
X
Low
High
High Impedance
Active
High Impedance
MAX225 Low
High
High Impedance
Active
MAX235
MAX236
MAX240
Low
Low
High
— —
Low
High
X
High Impedance
Active
High Impedance
MAX220–MAX249 +5V-Powered, Multichannel
RS-232 Drivers/Receivers
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14
The receiver inputs withstand an input overvoltage up to
±25V and provide input terminating resistors with nominal
5kΩ values. The receivers implement Type 1 interpreta-
tion of the fault conditions of V.28 and EIA/TIA-232E.
The receiver input hysteresis is typically 0.5V with a
guaranteed minimum of 0.2V. This produces clear out-
put transitions with slow-moving input signals, even with
moderate amounts of noise and ringing. The receiver
propagation delay is typically 600ns and is independent
of input swing direction.
Low-Power Receive Mode
The low-power receive mode feature of the MAX223,
MAX242, and MAX245–MAX249 puts the IC into shut-
down mode but still allows it to receive information. This is
important for applications where systems are periodically
awakened to look for activity. Using low-power receive
mode, the system can still receive a signal that will acti-
vate it on command and prepare it for communication at
faster data rates. This operation conserves system power.
Negative Threshold—MAX243
The MAX243 is pin compatible with the MAX232A, differ-
ing only in that RS-232 cable fault protection is removed
on one of the two receiver inputs. This means that con-
trol lines such as CTS and RTS can either be driven
or left unconnected without interrupting communication.
Different cables are not needed to interface with different
pieces of equipment.
The input threshold of the receiver without cable fault
protection is -0.8V rather than +1.4V. Its output goes
positive only if the input is connected to a control line that
is actively driven negative. If not driven, it defaults to the
0 or “OK to send” state. Normally‚ the MAX243’s other
receiver (+1.4V threshold) is used for the data line (TD or
RD)‚ while the negative threshold receiver is connected to
the control line (DTR‚ DTS‚ CTS‚ RTS, etc.).
Other members of the RS-232 family implement the
optional cable fault protection as specified by EIA/TIA-
232E specifications. This means a receiver output goes
high whenever its input is driven negative‚ left uncon-
nected‚ or shorted to ground. The high output tells the
serial communications IC to stop sending data. To avoid
this‚ the control lines must either be driven or connected
with jumpers to an appropriate positive voltage level.
Shutdown—MAX222–MAX242
On the MAX222‚ MAX235‚ MAX236‚ MAX240‚ and
MAX241‚ all receivers are disabled during shutdown.
On the MAX223 and MAX242‚ two receivers continue
to operate in a reduced power mode when the chip is in
shutdown. Under these conditions‚ the propagation delay
increases to about 2.5μs for a high-to-low input transition.
When in shutdown, the receiver acts as a CMOS inverter
with no hysteresis. The MAX223 and MAX242 also have
a receiver output enable input (EN for the MAX242 and
EN for the MAX223) that allows receiver output control
independent of SHDN (SHDN for MAX241). With all other
devices‚ SHDN (SHDN for MAX241) also disables the
receiver outputs.
The MAX225 provides five transmitters and five receiv-
ers‚ while the MAX245 provides ten receivers and eight
transmitters. Both devices have separate receiver and
transmitter-enable controls. The charge pumps turn off
and the devices shut down when a logic high is applied
to the ENT input. In this state, the supply current drops to
less than 25μA and the receivers continue to operate in
a low-power receive mode. Driver outputs enter a high-
impedance state (three-state mode). On the MAX225‚
all five receivers are controlled by the ENR input. On the
MAX245‚ eight of the receiver outputs are controlled by
the ENR input‚ while the remaining two receivers (RA5
and RB5) are always active. RA1–RA4 and RB1–RB4
are put in a three-state mode when ENR is a logic high.
Receiver and Transmitter Enable
Control Inputs
The MAX225 and MAX245–MAX249 feature transmitter
and receiver enable controls.
The receivers have three modes of operation: full-speed
receive (normal active)‚ three-state (disabled)‚ and low-
power receive (enabled receivers continue to function at
lower data rates). The receiver enable inputs control the
full-speed receive and three-state modes. The transmit-
ters have two modes of operation: full-speed transmit
(normal active) and three-state (disabled). The transmit-
ter enable inputs also control the shutdown mode. The
device enters shutdown mode when all transmitters are
disabled. Enabled receivers function in the low-power
receive mode when in shutdown.
MAX220–MAX249 +5V-Powered, Multichannel
RS-232 Drivers/Receivers
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15
Tables 1a–1d define the control states. The MAX244 has
no control pins and is not included in these tables.
The MAX246 has ten receivers and eight drivers with
two control pins, each controlling one side of the device.
A logic high at the A-side control input (ENA) causes the
four A-side receivers and drivers to go into a three-state
mode. Similarly, the B-side control input (ENB) causes
the four B-side drivers and receivers to go into a three-
state mode. As in the MAX245, one Aside and one B-side
receiver (RA5 and RB5) remain active at all times. The
entire device is put into shutdown mode when both the A
and B sides are disabled (ENA = ENB = +5V).
The MAX247 provides nine receivers and eight drivers
with four control pins. The ENRA and ENRB receiver
enable inputs each control four receiver outputs. The
ENTA and ENTB transmitter enable inputs each control
four drivers. The ninth receiver (RB5) is always active.
The device enters shutdown mode with a logic high on
both ENTA and ENTB.
The MAX248 provides eight receivers and eight drivers
with four control pins. The ENRA and ENRB receiver
enable inputs each control four receiver outputs. The
ENTA and ENTB transmitter enable inputs control four
drivers each. This part does not have an always-active
receiver. The device enters shutdown mode and transmit-
ters go into a three-state mode with a logic high on both
ENTA and ENTB.
The MAX249 provides ten receivers and six drivers with
four control pins. The ENRA and ENRB receiver enable
inputs each control five receiver outputs. The ENTA and
ENTB transmitter enable inputs control three drivers
each. There is no always-active receiver. The device
enters shutdown mode and transmitters go into a three-
state mode with a logic high on both ENTA and ENTB. In
shutdown mode, active receivers operate in a low-power
receive mode at data rates up to 20kb/s.
Applications Information
Figures 5 through 25 show pin configurations and typi-
cal operating circuits. In applications that are sensitive to
power-supply noise, VCC should be decoupled to ground
with a capacitor of the same value as C1 and C2 con-
nected as close as possible to the device.
MAX220–MAX249 +5V-Powered, Multichannel
RS-232 Drivers/Receivers
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16
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Figure 5. MAX220/MAX232/MAX232A Pin Configuration and Typical Operating Circuit
Figure 6. MAX222/MAX242 Pin Configurations and Typical Operating Circuit
TOP VIEW
16
15
14
13
12
11
10
9
1
2
3
4
5
6
7
8
VCC
GND
T1OUT
R1IN
C2+
C1-
V+
C1+
+
MAX220
MAX232
MAX232A R1OUT
T1IN
T2IN
R2OUT
R2IN
T2OUT
V-
C2-
DIP/SO
V+
V-
2+10V
C1+
C1
C2
1
3
4
5
11
10
12
9
6
14
7
13
8
T1IN
R1OUT
T2IN
R2OUT
T1OUT
R1IN
T2OUT
R2IN
+5V INPUT
C2+ -10V
C4
RS-232
OUTPUTS
RS-232
INPUTS
TTL/CMOS
INPUTS
TTL/CMOS
OUTPUTS
GND
15
5k
5k
400k
400k
+5V
+5V
+10V TO -10V
VOLTAGE INVERTER
+5V TO +10V
VOLTAGE DOUBLER
16
C3
C5
CAPACITANCE (µF)
DEVICE
MAX220
MAX232
MAX232A
C1
0.047
1.0
0.1
C2
0.33
1.0
0.1
C3
0.33
1.0
0.1
C4
0.33
1.0
0.1
C5
0.33
1.0
0.1
C2-
C1-
VCC
5k
DIP/SO
18
17
16
15
14
13
12
11
1
2
3
4
5
6
7
8
SHDN
VCC
GND
T1OUT
C1-
V+
C1+
(N.C.) EN
R1IN
R1OUT
T1IN
T2IN
T2OUT
V-
C2-
C2+
10
9R2OUT
R2IN
MAX222
MAX242
20
19
18
17
16
15
14
13
1
2
3
4
5
6
7
8
SHDN
VCC
GND
T1OUT
C1-
V+
C1+
(N.C.) EN
N.C.
R1IN
R1OUT
N.C.
T2OUT
V-
C2-
C2+
12
11
9
10
T1IN
T2IN
R2OUT
R2IN
MAX222
MAX242
SSOP
( ) ARE FOR MAX222 ONLY.
PIN NUMBERS IN TYPICAL OPERATING CIRCUIT ARE FOR DIP/SO PACKAGES ONLY.
V+
V-
3+10V
C1
C2
2
4
5
6
12
11
13
7
15
8
14
9
T1IN
R1OUT
T2IN
R2OUT
T1OUT
(EXCEPT MAX220)
(EXCEPT MAX220)
R1IN
T2OUT
R2IN
+5V INPUT
C2+ -10V
C4
RS-232
OUTPUTS
RS-232
INPUTS
TTL/CMOS
INPUTS
TTL/CMOS
OUTPUTS
GND
16
5k
400k
400k
+5V
+5V
+10V TO -10V
VOLTAGE INVERTER
VCC
+5V TO +10V
VOLTAGE DOUBLER
17
C3
C5
1
10
18
SHDN
EN
(N.C.)
ALL CAPACITORS = 0.1µF
C2-
C1+
C1-
+
+
TOP VIEW
MAX220–MAX249 +5V-Powered, Multichannel
RS-232 Drivers/Receivers
www.maximintegrated.com Maxim Integrated
17
flflflflflflflflflflflflflfl LHJLILILHJULHJLILHJL‘L‘ 1: (2 MW flow (2 TZW TZOUT n raw mom (2 MN mom (2 raw W OUT mom fl RUN Rzom : sz mom : Raw mom T RMN ‘ g >—¢ 2 m
Figure 7. MAX225 Pin Configuration and Typical Operating Circuit
13
14
28
27
26
25
24
23
22
21
1
2
3
4
5
6
7
8
VCC
VCC VCC
400k
400k
400k
400k
400k
T1OUT
+5V
+5V
0.1µF
+5V
3
28 27
4
25
24
23
26
5
6
7
22
GND
ENR
ENR
GND
21
+5V
+5V
+5V
T2OUT
T3OUT
T4OUT
5k
5k
5k
5k
5k
14
13
2
1
T5OUT
T5OUT
R1IN
R2IN
R3IN
R4IN
R5IN
T1IN 11
12
18
17
16
15
10
9
8
19
20
T2IN
T3IN
T4IN
T5IN
ENT
R2OUT
R3OUT
R4OUT
PINS (ENR, GND, VCC, T5OUT) ARE INTERNALLY CONNECTED.
CONNECT EITHER OR BOTH EXTERNALLY. T5OUT IS A SINGLE DRIVER.
R5OUT
R1OUT
VCC
ENT
T3IN
T2IN
T1IN
ENR
ENR
T4IN
T5IN
R4OUT
R5OUT
R3IN
R3OUT
R2OUT
R1OUT
20
19
18
17
9
10
11
12
R5IN
R4IN
T3OUT
T4OUT
T2OUT
T1OUT
R1IN
R2IN
SO
MAX225
16
15
T5OUT
MAX225 FUNCTIONAL DESCRIPTION
5 RECEIVERS
5 TRANSMITTERS
2 CONTROL PINS
1 RECEIVER ENABLE (ENR)
1 TRANSMITTER ENABLE (ENT)
T5OUT
GND
GND
TOP VIEW
+
MAX220–MAX249 +5V-Powered, Multichannel
RS-232 Drivers/Receivers
www.maximintegrated.com Maxim Integrated
18
J 11,, 2 3 m m fl iiim g, 5 EU 33333333333333 KKKEEKKKEKKEEE
Figure 8. MAX223/MAX241 Pin Configuration and Typical Operating Circuit
GND
10
27R3OUT
23
R4OUT
R3IN
R4IN
5k
5k
54
R2OUT R2IN
5k
RS-232
INPUTS
LOGIC
OUTPUTS
RS-232
OUTPUTS
TTL/CMOS
INPUTS
R2
89
R1OUT R1IN
5k
R1
R3
R4
19 18
R5OUT R5IN
5k
R5
2
7T1IN T1OUT
+5V
400k
+5V
63
T2IN T2OUT
T2
400k
20 T3OUT 1
T3IN
+5V
T3
400k
C1+
C1-
1.0µF
12 VCC
+5V INPUT
11
17
1.0µF
13
1.0µF
+5V TO +10V
VOLTAGE DOUBLER
26
1.0µF
T1
28
21 T4IN T4OUT
+5V
400k
T4
14
C2+
C2-
15
1.0µF 16
+10V TO -10V
VOLTAGE INVERTER
V+
22
EN (EN)
24 25
28
27
26
25
24
23
22
21
20
19
18
17
16
15
1
2
3
4
5
6
7
8
9
10
11
12
13
14
T4OUT
R3IN
R3OUT
SHDN (SHDN)
R4IN*
C2+
R4OUT*
T4IN
T3IN
R5OUT*
R5IN*
V-
C2-
C1-
V+
C1+
VCC
GND
R1IN
R1OUT
T1IN
T2IN
R2OUT
R2IN
T2OUT
T1OUT
T3OUT
Wide SO/
SSOP
MAX223
MAX241
EN (EN)
SHDN
(SHDN)
*R4 AND R5 IN MAX223 REMAIN ACTIVE IN SHUTDOWN.
NOTE: PIN LABELS IN ( ) ARE FOR MAX241.
V-
+
TOP VIEW
MAX220–MAX249 +5V-Powered, Multichannel
RS-232 Drivers/Receivers
www.maximintegrated.com Maxim Integrated
19
i; 1;, L: b E, m T)T<><><(a {e="" \="" 333333333]="" v="" eeekkkekke="" 3333333]="" cccccccc="" 333333]="" v="" ccccccc="">
Figure 9. MAX230 Pin Configuration and Typical Operating Circuit
Figure 10. MAX231 Pin Configurations and Typical Operating Circuit
20
19
18
17
16
15
14
13
1
2
3
4
5
6
7
8
T5IN
N.C.
SHDN
T2IN
T2OUT
T1OUT
T5OUT
T4IN
T3IN
V-
C1+
VCC
GND
T1IN
12
11
9
10
C2-
C2+
C1-
V+
DIP/SO
MAX230
V+
V-
9
C1+
C1-
8
10
11
12
5
4
14
13
2
3
1
20
T3IN
T4IN
T2IN
T5IN
T1OUT
T2OUT
+5V INPUT
C2+
C2-
RS-232
OUTPUTS
TTL/CMOS
INPUTS
GND
6
400k
+5V
400k
+5V
400k
+5V
400k
+5V
400k
+5V
+10V TO -10V
VOLTAGE INVERTER
VCC
+5V TO +10V
VOLTAGE DOUBLER
7
1.0µF
1.0µF
1.0µF
1.0µF
19
15
16
T3OUT T4OUT
18
x
T1IN
T3OUT
T4OUT
T5OUT
17
1.0µF
T2
T3
T4
T5
N.C. SHDN
T1
+
TOP VIEW
V+
V-
14
C1+
C1-
1
2
8
7
3
11
4
T2IN
T1IN T1OUT
T2OUT
+5V INPUT
RS-232
INPUTS
TTL/CMOS
OUTPUTS
GND
12 (14)
5k
5k
+12V TO -12V
VOLTAGE CONVERTER
13 (15)
1.0µF
1.0µF
C2
1.0µF
400k
+5V
400k
+5V
6
910
R1IN
R2IN
R2OUT
R1OUT
5
16
15
14
13
12
11
10
9
1
2
3
4
5
6
7
8
V+
VCC
GND
T1OUT
T2OUT
V-
C-
C+
MAX231
R1IN
R1OUT
T1IN
N.C.
N.C.
T2IN
R2OUT
R2IN
SO
(12)
RS-232
OUTPUTS
TTL/CMOS
INPUTS
(11)
(13)(10)
VCC
PIN NUMBERS IN ( ) ARE FOR SO PACKAGE.
14
13
12
11
10
9
8
1
2
3
4
5
6
7
V+
VCC
GND
T1OUTT2OUT
V-
C-
C+
MAX231
R1IN
R1OUT
T1INT2IN
R2OUT
R2IN
DIP
+7.5V TO +12V
(16)
T1
T2
R1
R2
++
TOP VIEW
MAX220–MAX249 +5V-Powered, Multichannel
RS-232 Drivers/Receivers
www.maximintegrated.com Maxim Integrated
20
333 13E, 3333333333 CCCCCCCCCC 1,, {5 [wk 33333333 V KKEEKEEK
Figure 11. MAX233/MAX233A Pin Configuration and Typical Operating Circuit
Figure 12. MAX234 Pin Configuration and Typical Operating Circuit
2
1
5
18
T2IN
T1IN T1OUT
T2OUT
+5V INPUT
RS-232
INPUTS
TTL/CMOS
OUTPUTS
GND GND
6 9
400k
+5V
400k
+5V
5k
5k
7
20
34
R1IN
R2IN
R2OUT
R1OUT
19
RS-232
OUTPUTS
TTL/CMOS
INPUTS
VCC
PIN NAMES IN ( ) ARE FOR SO PACKAGE.
20
19
18
17
16
15
14
13
1
2
3
4
5
6
7
8
R2IN
T2OUT
V-
R1IN
R1OUT
T1IN
C2-
C2+
V+ (C1-)
C1- (C1+)
(V+) C1+
VCC
GND
T1OUT
12
11
9
10
V- (C2+)
C2+ (C2-)
(V-) CS-
GND
DIP/SO
MAX233
MAX233A
T2IN R2OUT
C1+
C1-
V-
V-
V+
C2+
C2-
CS-
C2+
8 (13)
13 (14)
12 (10)
17
14 (8)
11 (12)
15
16
10 (11)
DO NOT MAKE
CONNECTIONS TO
THESE PINS
INTERNAL -10V
POWER SUPPLY
INTERNAL +10V
POWER SUPPLY
1.0µF
TOP VIEW
+
16
15
14
13
12
11
10
9
1
2
3
4
5
6
7
8
T3OUT
T4OUT
T4IN
T3IN
T1IN
T2IN
T2OUT
T1OUT
MAX234
V-
C2-
C2+
C1-
V+
C1+
VCC
GND
DIP/SO
V+
V-
8
C1+
C1-
1.0µF
1.0µF
1.0µF
7
9
10
11
4
3
13
14
12
1
2
16
15
T1IN
T3IN
T2IN
T4IN
T1OUT
T3OUT
T2OUT
T4OUT
+5V INPUT
C2-
C2+
RS-232
OUTPUTS
TTL/CMOS
INPUTS
GND
5
+5V
+5V
+10V TO -10V
VOLTAGE INVERTER
VCC
+5V TO +10V
VOLTAGE DOUBLER
6
+5V
+5V
400k
400k
400k
400k
1.0µF
1.0µF
T1
T2
T4
T3
+
TOP VIEW
MAX220–MAX249 +5V-Powered, Multichannel
RS-232 Drivers/Receivers
www.maximintegrated.com Maxim Integrated
21
($2, ($3,, E21,, 1<:,><:, g="" 333333333333="" v="" cccccccccccc="">
Figure 13. MAX235 Pin Configuration and Typical Operating Circuit
1.0µF
+5V INPUT
GND
11
6
23
5
R2OUT
RS-232
INPUTS
TTL/CMOS
OUTPUTS
14 13
21
R5OUT
5k
17 18
R4OUT
5k
24
R3OUT
5k
24
23
22
21
20
19
18
17
1
2
3
4
5
6
7
8
R3IN
R3OUT
T5IN
SHDNT2OUT
T1OUT
T3OUT
T4OUT
EN
T5OUT
R4IN
R4OUTT1IN
T2IN
R2OUT
R2IN
16
15
14
13
9
10
11
12
T4IN
T3IN
R5OUT
R5INVCC
GND
R1IN
R1OUT
DIP
MAX235
5k
9 10
R1OUT R1IN
R2IN
R3IN
R4IN
R5IN
5k
7
15
3
4
T2IN
T3OUT RS-232
OUTPUTS
TTL/CMOS
INPUTS
22 19T5IN T5OUT
+5V
16 1T4IN T4OUT
+5V
2
T3IN
+5V
+5V
8T1IN T1OUT
+5V
T2OUT
T1
T1
R2
R3
R4
R5
T2
T3
T5
T4
400k
400k
400k
400k
400k
SHDN
EN
20
12
VCC
+
TOP VIEW
MAX220–MAX249 +5V-Powered, Multichannel
RS-232 Drivers/Receivers
www.maximintegrated.com Maxim Integrated
22
j 3, fl 3 RM 3 Y>>>\:, E: Y>>>\.:, L : j, :2: g? {E r / RZDUT 13 13w % 19 TMN % s 1sz 33333333333] CCCCCCCCCCCC
Figure 14. MAX236 Pin Configuration and Typical Operating Circuit
GND
8
23
R2OUT RS-232
INPUTS
TTL/CMOS
OUTPUTS
17 16
21
R3OUT
R2IN
R3IN
5k
5k
54
R1OUT R1IN
5k
RS-232
OUTPUTS
TTL/CMOS
INPUTS
R1
R2
R3
2
7T1IN T1OUT
+5V
T1
400k
63
T2IN
+5V
T2OUT
T2
400k
18 T3OUT 1
T3IN
+5V
T3
400k
19 24
T4IN T4OUT
+5V
T4
400k
SHDN
EN
20
11
C1+
C1-
1.0µF
10
12
13
14
15
+5V INPUT
C2+
C2-
VCC
+5V TO +10V
VOLTAGE DOUBLER
91.0µF
1.0µF
+10V TO -10V
VOLTAGE INVERTER
22
24
23
22
21
20
19
18
17
1
2
3
4
5
6
7
8
T4OUT
R2IN
R2OUT
SHDNR1IN
T2OUT
T1OUT
T3OUT
T4IN
T3IN
R3OUTGND
T1IN
T2IN
R1OUT
16
15
14
13
9
10
11
12
R3IN
V-
C2-
C2+C1-
V+
C1+
VCC
DIP/SO
MAX236 EN
1.0µF
1.0µF
TOP VIEW
V+
V-
+
MAX220–MAX249 +5V-Powered, Multichannel
RS-232 Drivers/Receivers
www.maximintegrated.com Maxim Integrated
23
J E \m I<><><>1 m m w m m 33333333333] u KEKCCCECCKCK
Figure 15. MAX237 Pin Configuration and Typical Operating Circuit
GND
8
23
R2OUT RS-232
INPUTS
TTL/CMOS
OUTPUTS
17 16
R3OUT
R2IN
R3IN
5k
5k
54
R1OUT R1IN
5k
RS-232
OUTPUTS
TTL/CMOS
INPUTS
R1
R2
R3
2
7T1IN T1OUT
+5V
T1
400k
63
T2IN
+5V
T2OUT
T2
400k
18 T3OUT 1
T3IN
+5V
T3
400k
21 20
T5IN T5OUT
+5V
T5
400k
11
C1+
C1-
1.0µF
10
12
13
14
15
+5V INPUT
C2+
C2-
VCC
+5V TO +10V
VOLTAGE DOUBLER
91.0µF
1.0µF
+10V TO -10V
VOLTAGE INVERTER
22
24
23
22
21
20
19
18
17
1
2
3
4
5
6
7
8
T4OUT
R2IN
R2OUT
T5INR1IN
T2OUT
T1OUT
T3OUT
T4IN
T3IN
R3OUTGND
T1IN
T2IN
R1OUT
16
15
14
13
9
10
11
12
R3IN
V-
C2-
C2+C1-
V+
C1+
VCC
DIP/SO
MAX237 T5OUT
1.0µF
1.0µF
19 24
T4IN T4OUT
+5V
T4
400k
V+
V-
+
TOP VIEW
MAX220–MAX249 +5V-Powered, Multichannel
RS-232 Drivers/Receivers
www.maximintegrated.com Maxim Integrated
24
4,, J E; ‘ m m éimnsiftéjnsi, r1£2ir
16. MAX238 Pin Configuration and Typical Operating Circuit
GND
8
3
R2OUT
22 23
R3OUT
R2IN
R3IN
5k
5k
67
R1OUT R1IN
5k
RS-232
OUTPUTS
TTL/CMOS
INPUTS
RS-232
INPUTS
TTL/CMOS
OUTPUTS
R1
R2
R3
17 16
R4OUT R4IN
5k
R4
2
5T1IN T1OUT
+5V
400k
+5V
18 1
T2IN T2OUT
T2
400k
19 T3OUT 24
T3IN
+5V
T3
400k
11
C1+
C1-
1.0µF
10
12
13
14
15
+5V INPUT
C2+
C2-
VCC
+5V TO +10V
VOLTAGE DOUBLER
91.0µF
1.0µF
+10V TO -10V
VOLTAGE INVERTER
4
1.0µF
1.0µF
21 20
T4IN T4OUT
+5V
T4
400k
T1
24
23
22
21
20
19
18
17
1
2
3
4
5
6
7
8
T3OUT
R3IN
R3OUT
T4INR2OUT
R2IN
T1OUT
T2OUT
TOP VIEW
T3IN
T2IN
R4OUTGND
R1IN
R1OUT
T1IN
16
15
14
13
9
10
11
12
R4IN
V-
C2-
C2+C1-
V+
C1+
VCC
DIP/SO
MAX238 T4OUT
+
V+
V-
MAX220–MAX249 +5V-Powered, Multichannel
RS-232 Drivers/Receivers
www.maximintegrated.com Maxim Integrated
25
E 3§?§§iéii (Si, 321,, g, { 3311133131]: V CCCCCCCCCCCC
Figure 17. MAX239 Pin Configuration and Typical Operating Circuit
GND
3
18
R3OUT
12
R4OUT
R3IN
R4IN
5k
5k
22 21
R2OUT R2IN
5k
RS-232
OUTPUTS
TTL/CMOS
INPUTS
RS-232
INPUTS
TTL/CMOS
OUTPUTS
R2
12
R1OUT R1IN
5k
R1
R3
R4
10 9
R5OUT R5IN
5k
R5
19
24 T1IN T1OUT
+5V
400k
+5V
23 20
T2IN T2OUT
T2
400k
16 T3OUT 13
T3IN
+5V
T3
400k
C1+
C1-
1.0µF
6VCC 8
+5V INPUT
45
1.0µF
+10V TO -10V
VOLTAGE INVERTER
17
1.0µF
T1
24
23
22
21
20
19
18
17
1
2
3
4
5
6
7
8
T1IN
T2IN
R2OUT
R2INVCC
GND
R1IN
R1OUT
T1OUT
R3IN
R3OUTV-
C-
C+
V+
16
15
14
13
9
10
11
12
T3IN
N.C.
EN
T3OUTR4IN
R4OUT
R5OUT
R5IN
DIP/SO
MAX239 T2OUT
+7.5V TO +13.2V
INPUT
7
V+
11
EN
14 15
N.C.
V-
+
TOP VIEW
MAX220–MAX249 +5V-Powered, Multichannel
RS-232 Drivers/Receivers
www.maximintegrated.com Maxim Integrated
26
E E: fl £37,122, $37,131,, 4,, g a
Figure 18. MAX240 Pin Configuration and Typical Operating Circuit
GND
18
4R3OUT
40
R4OUT
R3IN
R4IN
5k
5k
13 10
R2OUT R2IN
5k
RS-232
INPUTS
TTL/CMOS
OUTPUTS
RS-232
OUTPUTS
TTL/CMOS
INPUTS
R2
16 17
R1OUT R1IN
5k
R1
R3
R4
36 35
R5OUT R5IN
5k
R5
7
15 T1IN T1OUT
+5V
400k
+5V
14 8
T2IN T2OUT
T2
400k
37 T3OUT 6
T3IN
+5V
T3
400k
C1+
C1-
1.0µF
25 VCC
+5V INPUT
19
30
1.0µF
26
1.0µF
+5V TO +10V
VOLTAGE DOUBLER
3
1.0µF
T1
+5V
241
T5IN T5OUT
T5
400k
5
38 T4IN T4OUT
+5V 400k
T4
27
C2+
C2-
28
1.0µF 29
+5V TO -10V
VOLTAGE INVERTER
V+
39
EN
42 43
Plastic FP
MAX240
SHDN
EN
T5OUT
R4IN
R4OUT
R5OUT
R5IN
N.C.
N.C.
T3IN
T4IN
R2OUT
T2IN
T1IN
R1OUT
R1IN
N.C.
N.C.
N.C.
N.C.
VCC
GND
R2IN
N.C.
T4OUT
T2OUT
T1OUT
T3OUT
N.C.
R3IN
R3OUT
N.C.
T5IN
N.C.
C1+
C2
V+
C1-
C2+
N.C.
V-
N.C.
N.C.
N.C.
33
32
31
30
29
28
27
26
25
24
23
34
35
36
37
38
39
40
41
42
43
44
1
2
3
4
5
6
7
8
9
10
11
22
21
20
19
18
17
16
15
14
13
12
SHDN
TOP VIEW
V-
+
MAX220–MAX249 +5V-Powered, Multichannel
RS-232 Drivers/Receivers
www.maximintegrated.com Maxim Integrated
27
flflflflflflflfl LILILILILHJLILI RECEIVER INPUT R1 ourRur R2 OUTPUT 5 av H‘GH H‘GH OPEN H‘GH LOW 2 .av LOW LOW W W f—HfiH \H»
Figure 19. MAX243 Pin Configuration and Typical Operating Circuit
V+
V-
2+10V
C1+
C1-
1
3
4
5
11
10
12
9
6
14
7
13
8
T1IN
R1OUT
T2IN
R2OUT
T1OUT
R1IN
T2OUT
R2IN
+5V INPUT
C2+
C2-
-10V
RS-232
OUTPUTS
RS-232
INPUTS
TTL/CMOS
INPUTS
TTL/CMOS
OUTPUTS
GND
15
5k
5k
400k
400k
+5V
+5V
+10V TO -10V
VOLTAGE INVERTER
+5V TO +10V
VOLTAGE DOUBLER
16
16
15
14
13
12
11
10
9
1
2
3
4
5
6
7
8
C1+ VCC
GND
T1OUT
R1IN
R1OUT
T1IN
T2IN
R2OUT
MAX243
DIP/SO
V+
C1-
V-
C2+
C2-
T2OUT
R2IN
0.1µF
0.1µF
0.1µF
0.1µF
0.1µF
RECEIVER INPUT
-3V
OPEN
+3V
R1 OUTPUT
HIGH
HIGH
LOW
R2 OUTPUT
HIGH
LOW
LOW
TOP VIEW
VCC
+
MAX220–MAX249 +5V-Powered, Multichannel
RS-232 Drivers/Receivers
www.maximintegrated.com Maxim Integrated
28
12 H+ +4_4a<fi§ éflbkgi4+="" w="" w="" jjjjjjjjjjj="" flflflflflflflflflflfl="" eeeeeeeeee:="" r?="" flgfi="" h?="" «ya="" h?="" h?="" 43%="" h?="" «ya="" uuuuuuuuuuu="">
Figure 20. MAX244 Pin Configuration and Typical Operating Circuit
400k
+10V TO -10V VOLTAGE INVERTER
+5V TO +10V VOLTAGE DOUBLER
VCC
400k
400k
GND
+5V +5V
+5V +5V
+5V
25
24
23
21 20
2
1µF
1µF
1µF 1µF
1µF
16
3
17
4
18
5k
5k
5k
5k
5k
5k
5k
5k
5k
5k
C2-
C2+
C1-
C1+
TA2OUT
TA2IN
TA3OUT
TA3IN
TA4OUT
TA4IN
9 RA1IN
10 RA1OUT
8 RA2IN
11 RA2OUT
7 RA3IN
12 RA3OUT
6 RA4IN
13 RA4OUT
5 RA5IN
14
19
RA5OUT
26
22
43
29
42
28
41
27
36
35
37
34
38
33
39
32
40
31
V-
V+
TB2OUT
TB2IN
400k
2
15
TA1OUT
TA1IN
44
30
TB1OUT
TB1IN
TB3OUT
TB3IN
TB4OUT
TB4IN
RB1IN
RB1OUT
RB2IN
RB2OUT
RB3IN
RB3OUT
RB4IN
RB4OUT
RB5IN
RB5OUT
MAX249 FUNCTIONAL DESCRIPTION
10 RECEIVERS
5 A-SIDE RECEIVERS
5 B-SIDE RECEIVERS
8 TRANSMITTERS
4 A-SIDE TRANSMITTERS
4 B-SIDE TRANSMITTERS
NO CONTROL PINS
441234 404142
43
5
21 24 26
25 27 28
22 2319 20
8
9
10
11
12
13
14
15
16
17 29
30
31
32
33
34
35
36
37
38
TA3IN
VCC
RA5IN
MAX244
PLCC
TOP VIEW
TA4OUT
TA3OUT
TA2OUT
TA1OUT
TB1OUT
TB2OUT
TB3OUT
TB4OUT
RB5IN
GND
V+
C1+
C2+
C1-
V-
C2-
TB3IN
TB4IN
RB3IN
RB2IN
RB1IN
RB1OUT
RB2OUT
RB3OUT
RB4OUT
RB5OUT
TB1IN
TB2IN
TA2IN
TA1IN
RA5OUT
RA4OUT
RA3OUT
RA2OUT
RA1OUT
RA1IN
RA2IN
739 RB4IN
RA3IN
6
18
RA4INTA4IN
+5V +5V
+5V +5V
+
MAX220–MAX249 +5V-Powered, Multichannel
RS-232 Drivers/Receivers
www.maximintegrated.com Maxim Integrated
29
jjjjjjjjjjjjjjjjjjjj v CCCCCCCCCCCECECEECEC
Figure 21. MAX245 Pin Configuration and Typical Operating Circuit
400k
VCC
400k
400k
GND
+5V +5V
+5V +5V
+5V
40
17
1µF
3
18
4
19
5
5k
5k
5k
5k
5k
5k
5k
5k
5k
5k
TA2OUT
TA2IN
TA3OUT
TA3IN
TA4OUT
TA4IN
1
11 RA1IN
10 RA1OUT
12 RA2IN
9 RA2OUT
13 RA3IN
8 RA3OUT
14 RA4IN
7 RA4OUT
15 RA5IN
6
20
RA5OUT
23
37
22
36
21
35
29
30
28
31
27
32
26
33
25
34
TB2OUT
TB2IN
TB3OUT
TB3IN
TB4OUT
TB4IN
RB1IN
RB1OUT
RB2IN
RB2OUT
RB3IN
RB3OUT
RB4IN
RB4OUT
RB5IN
RB5OUT
+5V +5V
400k
16
2
TA1OUT
TA1IN
24
38
TB1OUT
TB1IN
+5V +5V
40 VCC
ENT
TB1IN
TB2IN
TB3IN
TB4IN
RB5OUT
RB4OUT
RB3OUT
RB2OUT
RB1OUT
RB1IN
RB2IN
RB3IN
RB4IN
RB5IN
TB1OUT
TB2OUT
TB3OUT
TB4OUT
39
38
37
36
35
34
33
32
31
1
2
3
4
5
6
7
8
9
10
ENR
TA1IN
TA2IN
TA3IN
TA4IN
RA5OUT
RA4OUT
RA3OUT
RA2OUT
RA1OUT
RA1IN
RA2IN
RA3IN
RA4IN
RA5IN
TA1OUT
TA2OUT
TA3OUT
TA4OUT
GND
TOP VIEW
MAX245
30
29
28
27
26
25
24
23
22
21
11
12
13
14
15
16
17
18
19
DIP
20
MAX245 FUNCTIONAL DESCRIPTION
10 RECEIVERS
5 A-SIDE RECEIVERS (RA5 ALWAYS ACTIVE)
5 B-SIDE RECEIVERS (RB5 ALWAYS ACTIVE)
8 TRANSMITTTERS
4 A-SIDE TRANSMITTERS
2 CONTROL PINS
1 RECEIVER ENABLE (ENR)
1 TRANSMITTER ENABLE (ENT)
39
+
ENR ENT
MAX220–MAX249 +5V-Powered, Multichannel
RS-232 Drivers/Receivers
www.maximintegrated.com Maxim Integrated
30
.5v .5v .5v fléék figék fiéfiék a e WW 5, W jjjjjjjjjjjjjjjjjjj] v CCCCCCCCCCCCCCCCCCCC
Figure 22. MAX246 Pin Configuration and Typical Operating Circuit
400k
VCC
400k
GND
+5V
+5V
+5V
+5V
+5V
40
16
1µF
2
18
4
TA1OUT
TA1IN
TA3OUT
TA3IN
20
24
38
22
36
139
TB1OUT
TB1IN
TB3OUT
TB3IN
400k
+5V
17
3
TA2OUT
TA2IN
+5V
23
37
TB2OUT
TB2IN
400k
+5V
19
5
TA4OUT
TA4IN
+5V
21
35
TB4OUT
TB4IN
5k
5k
5k
5k
5k
5k
5k
5kΩ
5k
5k
11 RA1IN
10 RA1OUT
12 RA2IN
9 RA2OUT
13 RA3IN
8 RA3OUT
14 RA4IN
7 RA4OUT
15 RA5IN
6 RA5OUT
29
30
28
31
27
32
26
33
25
34
RB1IN
RB1OUT
RB2IN
RB2OUT
RB3IN
RB3OUT
RB4IN
RB4OUT
RB5IN
RB5OUT
40 VCC
ENB
TB1IN
TB2IN
TB3IN
TB4IN
RB5OUT
RB4OUT
RB3OUT
RB2OUT
RB1OUT
RB1IN
RB2IN
RB3IN
RB4IN
RB5IN
TB1OUT
TB2OUT
TB3OUT
TB4OUT
39
38
37
36
35
34
33
32
31
1
2
3
4
5
6
7
8
9
10
ENA
TA1IN
TA2IN
TA3IN
TA4IN
RA5OUT
RA4OUT
RA3OUT
RA2OUT
RA1OUT
RA1IN
RA2IN
RA3IN
RA4IN
RA5IN
TA1OUT
TA2OUT
TA3OUT
TA4OUT
GND
TOP VIEW
MAX246
30
29
28
27
26
25
24
23
22
21
11
12
13
14
15
16
17
18
19
DIP
20
MAX246 FUNCTIONAL DESCRIPTION
10 RECEIVERS
5 A-SIDE RECEIVERS (RA5 ALWAYS ACTIVE)
5 B-SIDE RECEIVERS (RB5 ALWAYS ACTIVE)
8 TRANSMITTERS
4 A-SIDE TRANSMITTERS
4 B-SIDE TRANSMITTERS
2 CONTROL PINS
ENABLE A-SIDE (ENA)
ENABLE B-SIDE (ENB)
ENA ENB
+
MAX220–MAX249 +5V-Powered, Multichannel
RS-232 Drivers/Receivers
www.maximintegrated.com Maxim Integrated
31
39 FIT .sv .sv .sv .sv .sv .sv .sv .sv fiééjh fiééfi; fiéék A jjjjjjjjjjjjjjjjjjj] v CCCCCCCCCCCCCCCCCCCC
Figure 23. MAX247 Pin Configuration and Typical Operating Circuit
400k
VCC
400k
GND
+5V
+5V
+5V
+5V
+5V
1
40
16
1µF
2
18
4
5k
5k
5k
5k
5k
5k
5k
5k
ENTA
TA1OUT
TA1IN
TA3OUT
TA3IN
6 RB5OUT
12 RA1IN
10 RA1OUT
13 RA2IN
9 RA2OUT
14 RA3IN
8 RA3OUT
15 RA4IN
7
20
RA4OUT
11
39
24
38
22
36
29
31
28
32
27
33
26
34
30ENRA
ENTB
TB1OUT
TB1IN
TB3OUT
TB3IN
RB1IN
5k
25
RB5IN
RB1OUT
RB2IN
RB2OUT
RB3IN
RB3OUT
RB4IN
RB4OUT
ENRB
400k
+5V
17
3
TA2OUT
TA2IN
+5V
23
37
TB2OUT
TB2IN
400k
+5V
19
5
TA4OUT
TA4IN
+5V
21
35
TB4OUT
TB4IN
40 VCC
ENTB
TB1IN
TB2IN
TB3IN
TB4IN
RB4OUT
RB3OUT
RB2OUT
RB1OUT
RB1IN
RB2IN
RB3IN
RB4IN
RB5IN
TB1OUT
TB2OUT
TB3OUT
TB4OUT
39
38
37
36
35
34
33
32
31
1
2
3
4
5
6
7
8
9
10
ENTA
TA1IN
TA2IN
TA3IN
TA4IN
RB5OUT
RA4OUT
RA3OUT
RA2OUT
RA1OUT
RA1IN
RA2IN
RA3IN
RA4IN
TA1OUT
TA2OUT
TA3OUT
TA4OUT
GND
TOP VIEW
MAX247
30
29
28
27
26
25
24
23
22
21
11
12
13
14
15
16
17
18
19
DIP
20
ENRA ENRB
MAX247 FUNCTIONAL DESCRIPTION
9 RECEIVERS
4 A-SIDE RECEIVERS
5 B-SIDE RECEIVERS (RB5 ALWAYS ACTIVE)
8 TRANSMITTERS
4 A-SIDE TRANSMITTERS
4 B-SIDE TRANSMITTERS
4 CONTROL PINS
ENABLE RECEIVER A-SIDE (ENRA)
ENABLE RECEIVER B-SIDE (ENRB)
ENABLE RECEIVER A-SIDE (ENTA)
ENABLE RECEIVER B-SIDE (ENTB)
+
MAX220–MAX249 +5V-Powered, Multichannel
RS-232 Drivers/Receivers
www.maximintegrated.com Maxim Integrated
32
2 a? %%% Rm; MM; M N E jjjjjjjjjjj flflflflflflflflflflfl UUUUUUUUUUU EEEEEEEEEEE
Figure 24. MAX248 Pin Configuration and Typical Operating Circuit
400k
+10V TO -10V VOLTAGE INVERTER
+5V TO +10V VOLTAGE DOUBLER
VCC
400k
GND
+5V
+5V
+5V
+5V
+5V
18
25
24
23
21 20
1
1µF
1µF
1µF 1µF
1µF
14
3
16
5k
5k
5k
5k
5k
5k
5k
5k
ENTA
C2-
C2+
C1-
C1+
TA1OUT
TA1IN
TA3OUT
TA3IN
8 RA1IN
10 RA1OUT
7 RA2IN
11 RA2OUT
6 RA3IN
12 RA3OUT
5 RA4IN
13
19
RA4OUT
9
27
26
22
44
31
42
29
37
35
38
34
39
33
40
32
36ENRA
ENTB
V-
V+
TB1OUT
TB1IN
TB3OUT
TB3IN
RB1IN
RB1OUT
RB2IN
RB2OUT
RB3IN
RB3OUT
RB4IN
RB4OUT
ENRB
400k
+5V
2
15
TA2OUT
TA2IN
+5V
43
30
TB2OUT
TB2IN
400k
+5V
4
17
TA4OUT
TA4IN
+5V
41
28
TB4OUT
TB4IN
441234 404142
43
5
21 24 26
25 27 28
22 2319 20
8
9
10
11
12
13
14
15
16
17 29
30
31
32
33
34
35
36
37
38
TA4IN
VCC
RA4IN
MAX248
PLCC
TOP VIEW
TA4OUT
TA3OUT
TA2OUT
TA1OUT
TB1OUT
TB2OUT
TB3OUT
TA4OUT
RB4IN
GND
V+
C1+
C2+
C1-
V-
C2-
TB4IN
ENTB
RB2IN
RB1IN
RB1OUT
RB2OUT
RB3OUT
RB4OUT
TB1IN
TB2IN
TB3IN
TA3IN
TA2IN
TA1IN
RA4OUT
RA3OUT
RA2OUT
RA1OUT
ENRA
RA1IN
739 RB3IN
RA2IN
6
18
RA3IN
ENRB
ENTA
MAX248 FUNCTIONAL DESCRIPTION
8 RECEIVERS
4 A-SIDE RECEIVERS
4 B-SIDE RECEIVERS
8 TRANSMITTERS
4 A-SIDE TRANSMITTERS
4 B-SIDE TRANSMITTERS
4 CONTROL PINS
ENABLE RECEIVER A-SIDE (ENRA)
ENABLE RECEIVER B-SIDE (ENRB)
ENABLE RECEIVER A-SIDE (ENTA)
ENABLE RECEIVER B-SIDE (ENTB)
+
MAX220–MAX249 +5V-Powered, Multichannel
RS-232 Drivers/Receivers
www.maximintegrated.com Maxim Integrated
33
n H N H+ av av 5% 0% u W «mg Mk? fly jjjjjjjjjjj flflflflflflflflflflfl UUUUUUUUUUU < cccccccccc:="" 9="" enra="" figw="" ya="" h?="" ya="" h?=""><§a h?="" flga="">
Figure 25. MAX249 Pin Configuration and Typical Operating Circuit
400k
+10V TO -10V VOLTAGE INVERTER
+5V TO +10V VOLTAGE DOUBLER
VCC
400k
400k
GND
+5V
+5V
+5V
+5V
+5V
+5V
+5V
18
25
24
23
21 20
1
1µF
1µF
1µF 1µF
15
2
16
3
17
5k
5k
5k
5k
5k
5k
5k
5k
5k
5k
ENTA
C2-
C2+
C1-
C1+
TA1OUT
TA1IN
TA2OUT
TA2IN
TA3OUT
TA3IN
8 RA1IN
10 RA1OUT
7 RA2IN
11 RA2OUT
6 RA3IN
12 RA3OUT
5 RA4IN
13 RA4OUT
4 RA5IN
14
19
RA5OUT
9
27
26
22
44
30
43
29
42
28
37
35
38
34
39
33
40
32
41
31
36ENRA
ENTB
V-
V+
TB1OUT
TB1IN
TB2OUT
TB2IN
TB3OUT
TB3IN
RB1IN
RB1OUT
RB2IN
RB2OUT
RB3IN
RB3OUT
RB4IN
RB4OUT
RB5IN
RB5OUT
ENRB
441234 404142
43
5
21 24 26
25 27 28
22 2319 20
8
9
10
11
12
13
14
15
16
17 29
30
31
32
33
34
35
36
37
38
VCC
RA4IN
RA5IN
MAX249
PLCC
TOP VIEW
TA3OUT
TA2OUT
TA1OUT
TB1OUT
TB2OUT
TB3OUT
RB4IN
RB5IN
GND
V+
C1+
C2+
C1-
V-
C2-
TB3IN
ENTB
RB2IN
RB1IN
RB1OUT
MAX249 FUNCTIONAL DESCRIPTION
10 RECEIVERS
5 A-SIDE RECEIVERS
5 B-SIDE RECEIVERS
6 TRANSMITTERS
3 A-SIDE TRANSMITTERS
3 B-SIDE TRANSMITTERS
4 CONTROL PINS
ENABLE RECEIVER A-SIDE (ENRA)
ENABLE RECEIVER B-SIDE (ENRB)
ENABLE RECEIVER A-SIDE (ENTA)
ENABLE RECEIVER B-SIDE (ENTB)
RB2OUT
RB3OUT
RB4OUT
RB5OUT
TB1IN
TB2INTA3IN
TA2IN
TA1IN
RA4OUT
RA5OUT
RA3OUT
RA2OUT
RA1OUT
ENRA
RA1IN
739 RB3IN
RA2IN
6
18
RA3IN
ENRB
ENTA
1µF
+
MAX220–MAX249 +5V-Powered, Multichannel
RS-232 Drivers/Receivers
www.maximintegrated.com Maxim Integrated
34
+Denotes a lead(Pb)-free/RoHS-compliant package.
*Contact factory for dice specifications.
PART TEMP RANGE PIN-PACKAGE
MAX220CPE+ 0°C to +70°C 16 Plastic DIP
MAX220CSE+ 0°C to +70°C 16 Narrow SO
MAX220CWE+ 0°C to +70°C 16 Wide SO
MAX220C/D 0°C to +70°C Dice*
MAX220EPE+ -40°C to +85°C 16 Plastic DIP
MAX220ESE+ -40°C to +85°C 16 Narrow SO
MAX220EWE+ -40°C to +85°C 16 Wide SO
MAX220EJE -40°C to +85°C 16 CERDIP
MAX220MJE 55°C to +125°C 16 CERDIP
MAX222CPN+ 0°C to +70°C 18 Plastic DIP
MAX222CWN+ 0°C to +70°C 18 Wide SO
MAX222C/D 0°C to +70°C Dice*
MAX222EPN+ -40°C to +85°C 18 Plastic DIP
MAX222EWN+ -40°C to +85°C 18 Wide SO
MAX222EJN -40°C to +85°C 18 CERDIP
MAX222MJN 55°C to +125°C 18 CERDIP
MAX223CAI+ 0°C to +70°C 28 SSOP
MAX223CWI+ 0°C to +70°C 28 Wide SO
MAX223C/D 0°C to +70°C Dice*
MAX223EAI+ -40°C to +85°C 28 SSOP
MAX223EWI+ -40°C to +85°C 28 Wide SO
MAX225CWI+ 0°C to +70°C 28 Wide SO
MAX225EWI+ -40°C to +85°C 28 Wide SO
MAX230CPP+ 0°C to +70°C 20 Plastic DIP1
MAX230CWP+ 0°C to +70°C 20 Wide SO
MAX230C/D 0°C to +70°C Dice*
MAX230EPP+ -40°C to +85°C 20 Plastic DIP
MAX230EWP+ -40°C to +85°C 20 Wide SO
MAX230EJP -40°C to +85°C 20 CERDIP
MAX230MJP 55°C to +125°C 20 CERDIP
MAX231CPD+ 0°C to +70°C 14 Plastic DIP
MAX231CWE+ 0°C to +70°C 16 Wide SO
MAX231CJD 0°C to +70°C 14 CERDIP
MAX231C/D 0°C to +70°C Dice*
MAX231EPD+ -40°C to +85°C 14 Plastic DIP
PART TEMP RANGE PIN-PACKAGE
MAX231EWE+ -40°C to +85°C 16 Wide SO
MAX231EJD -40°C to +85°C 14 CERDIP
MAX231MJD 55°C to +125°C 14 CERDIP
MAX232CPE+ 0°C to +70°C 16 Plastic DIP
MAX232CSE+ 0°C to +70°C 16 Narrow SO
MAX232CWE+ 0°C to +70°C 16 Wide SO
MAX232C/D 0°C to +70°C Dice*
MAX232EPE+ -40°C to +85°C 16 Plastic DIP
MAX232ESE+ -40°C to +85°C 16 Narrow SO
MAX232EWE+ -40°C to +85°C 16 Wide SO
MAX232EJE -40°C to +85°C 16 CERDIP
MAX232MJE 55°C to +125°C 16 CERDIP
MAX232MLP+ 55°C to +125°C 20 LCC
MAX232ACPE+ 0°C to +70°C 16 Plastic DIP
MAX232ACSE+ 0°C to +70°C 16 Narrow SO
MAX232ACWE+ 0°C to +70°C 16 Wide SO
MAX232AC/D 0°C to +70°C Dice*
MAX232AEPE+ -40°C to +85°C 16 Plastic DIP
MAX232AESE+ -40°C to +85°C 16 Narrow SO
MAX232AEWE+ -40°C to +85°C 16 Wide SO
MAX232AEJE -40°C to +85°C 16 CERDIP
MAX232AMJE 55°C to +125°C 16 CERDIP
MAX232AMLP+ 55°C to +125°C 20 LCC
MAX233CPP+ 0°C to +70°C 20 Plastic DIP
MAX233EPP+ -40°C to +85°C 20 Plastic DIP
MAX233ACPP+ 0°C to +70°C 20 Plastic DIP
MAX233ACWP+ 0°C to +70°C 20 Wide SO
MAX233AEPP+ -40°C to +85°C 20 Plastic DIP
MAX233AEWP+ -40°C to +85°C 20 Wide SO
MAX234CPE+ 0°C to +70°C 16 Plastic DIP
MAX234CWE+ 0°C to +70°C 16 Wide SO
MAX234C/D 0°C to +70°C Dice*
MAX234EPE+ -40°C to +85°C 16 Plastic DIP
MAX220–MAX249 +5V-Powered, Multichannel
RS-232 Drivers/Receivers
www.maximintegrated.com Maxim Integrated
35
Ordering Information
+Denotes a lead(Pb)-free/RoHS-compliant package.
*Contact factory for dice specifications.
PART TEMP RANGE PIN-PACKAGE
MAX234EWE+ -40°C to +85°C 16 Wide SO
MAX234EJE -40°C to +85°C 16 CERDIP
MAX234MJE 55°C to +125°C 16 CERDIP
MAX235CPG+ 0°C to +70°C 24 Wide Plastic DIP
MAX235EPG+ -40°C to +85°C 24 Wide Plastic DIP
MAX235EDG -40°C to +85°C 24 Ceramic SB
MAX235MDG 55°C to +125°C 24 Ceramic SB
MAX236CNG+ 0°C to +70°C 24 Narrow Plastic DIP
MAX236CWG+ 0°C to +70°C 24 Wide SO
MAX236C/D 0°C to +70°C Dice*
MAX236ENG+ -40°C to +85°C 24 Narrow Plastic DIP
MAX236EWG+ -40°C to +85°C 24 Wide SO
MAX236ERG -40°C to +85°C 24 Narrow CERDIP
MAX236MRG 55°C to +125°C 24 Narrow CERDIP
MAX237CNG+ 0°C to +70°C 24 Narrow Plastic DIP
MAX237CWG+ 0°C to +70°C 24 Wide SO
MAX237C/D 0°C to +70°C Dice*
MAX237ENG+ -40°C to +85°C 24 Narrow Plastic DIP
MAX237EWG+ -40°C to +85°C 24 Wide SO
MAX237ERG -40°C to +85°C 24 Narrow CERDIP
MAX237MRG 55°C to +125°C 24 Narrow CERDIP
MAX238CNG+ 0°C to +70°C 24 Narrow Plastic DIP
MAX238CWG+ 0°C to +70°C 24 Wide SO
MAX238C/D 0°C to +70°C Dice*
MAX238ENG+ -40°C to +85°C 24 Narrow Plastic DIP
MAX238EWG+ -40°C to +85°C 24 Wide SO
MAX238ERG -40°C to +85°C 24 Narrow CERDIP
MAX238MRG 55°C to +125°C 24 Narrow CERDIP
MAX239CNG+ 0°C to +70°C 24 Narrow Plastic DIP
MAX239CWG+ 0°C to +70°C 24 Wide SO
MAX239C/D 0°C to +70°C Dice*
MAX239ENG+ -40°C to +85°C 24 Narrow Plastic DIP
MAX239EWG+ -40°C to +85°C 24 Wide SO
MAX239ERG -40°C to +85°C 24 Narrow CERDIP
MAX239MRG 55°C to +125°C 24 Narrow CERDIP
PART TEMP RANGE PIN-PACKAGE
MAX240CMH+ 0°C to +70°C 44 Plastic FP
MAX240C/D 0°C to +70°C Dice*
MAX241CAI+ 0°C to +70°C 28 SSOP
MAX241CWI+ 0°C to +70°C 28 Wide SO
MAX241C/D 0°C to +70°C Dice*
MAX241EAI+ -40°C to +85°C 28 SSOP
MAX241EWI+ -40°C to +85°C 28 Wide SO
MAX242CAP+ 0°C to +70°C 20 SSOP
MAX242CPN+ 0°C to +70°C 18 Plastic DIP
MAX242CWN+ 0°C to +70°C 18 Wide SO
MAX242C/D 0°C to +70°C Dice*
MAX242EPN+ -40°C to +85°C 18 Plastic DIP
MAX242EWN+ -40°C to +85°C 18 Wide SO
MAX242EJN -40°C to +85°C 18 CERDIP
MAX242MJN 55°C to +125°C 18 CERDIP
MAX243CPE+ 0°C to +70°C 16 Plastic DIP
MAX243CSE+ 0°C to +70°C 16 Narrow SO
MAX243CWE+ 0°C to +70°C 16 Wide SO
MAX243C/D 0°C to +70°C Dice*
MAX243EPE+ -40°C to +85°C 16 Plastic DIP
MAX243ESE+ -40°C to +85°C 16 Narrow SO
MAX243EWE+ -40°C to +85°C 16 Wide SO
MAX243EJE -40°C to +85°C 16 CERDIP
MAX243MJE 55°C to +125°C 16 CERDIP
MAX244CQH+ 0°C to +70°C 44 PLCC
MAX244C/D 0°C to +70°C Dice*
MAX244EQH+ -40°C to +85°C 44 PLCC
MAX245CPL+ 0°C to +70°C 40 Plastic DIP
MAX245C/D 0°C to +70°C Dice*
MAX245EPL+ -40°C to +85°C 40 Plastic DIP
MAX246CPL+ 0°C to +70°C 40 Plastic DIP
MAX246C/D 0°C to +70°C Dice*
MAX246EPL+ -40°C to +85°C 40 Plastic DIP
MAX220–MAX249 +5V-Powered, Multichannel
RS-232 Drivers/Receivers
www.maximintegrated.com Maxim Integrated
36
Ordering Information (continued)
+Denotes a lead(Pb)-free/RoHS-compliant package.
*Contact factory for dice specifications.
PART TEMP RANGE PIN-PACKAGE
MAX247CPL+ 0°C to +70°C 40 Plastic DIP
MAX247C/D 0°C to +70°C Dice*
MAX247EPL+ -40°C to +85°C 40 Plastic DIP
MAX248CQH+ 0°C to +70°C 44 PLCC
MAX248C/D 0°C to +70°C Dice*
MAX248EQH+ -40°C to +85°C 44 PLCC
MAX249CQH+ 0°C to +70°C 44 PLCC
MAX249EQH+ -40°C to +85°C 44 PLCC
PART
NUMBER
POWER
SUPPLY
(V)
NO. OF
RS-232
Drivers/
Rx
NO. OF
EXT CAP
NOMINAL
CAPACITOR
VALUE (µF)
SHDN
AND
THREE-
STATE
Rx
ACTIVE
IN SHDN
DATA
RATE
(kbps)
FEATURES
MAX220 +5 2/2 4 0.047, 0.33 No No 120 Ultra-low-power, industry-standard pinout
MAX222
MAX223
MAX225
MAX230
MAX231
MAX232
MAX232A
MAX233
MAX233A
+5
+5
+5
+5
+5 and
+7.5 to
+5
+5
+5
+5
2/2
4/5
5/5
5/0
2/2
2/2
2/2
2/2
2/2
4
4
0
4
2
4
4
0
0
0.1
1.0, 0.1
1.0, 0.1
1.0, 0.1
1.0, 0.1
0.1
Yes
Yes
Yes
Yes
No
No
No
No
No
No
Yes
Yes
No
No
No
No
No
No
200
120
120
120
120
120 (64)
200
120
200
Low-power shutdown
MAX241 and receivers active in shutdown
Available in SO
5 drivers with shutdown
Standard +5/+12V or battery supplies;
same functions as MAX232
Industry standard
Higher slew rate, small caps
No external caps
No external caps, high slew rate
MAX234
MAX235
MAX236
MAX237
MAX238
MAX239
MAX240
MAX241
+5
+5
+5
+5
+5
+5 and
+7.5 to
+5
+5
4/0
5/5
4/3
5/3
4/4
3/5
5/5
4/5
4
0
4
4
4
2
4
4
1.0, 0.1
1.0, 0.1
1.0, 0.1
1.0, 0.1
1.0, 0.1
1.0
1.0, 0.1
No
Yes
Yes
No
No
No
Yes
Yes
No
No
No
No
No
No
No
No
120
120
120
120
120
120
120
120
Replaces 1488
No external caps
Shutdown, three state
Complements IBM PC serial port
Replaces 1488 and 1489
Standard +5/+12V or battery supplies;
single-package solution for IBM PC serial
DIP or flatpack package
Complete IBM PC serial port
MAX242
MAX243
MAX244
MAX245
MAX246
MAX247
MAX248
MAX249
+5
+5
+5
+5
+5
+5
+5
+5
2/2
2/2
8/10
8/10
8/10
8/9
8/8
6/10
4
4
4
0
0
0
4
4
0.1
0.1
1.0
1.0
1.0
Yes
No
No
Yes
Yes
Yes
Yes
Yes
Yes
No
No
Yes
Yes
Yes
Yes
Yes
200
200
120
120
120
120
120
120
Separate shutdown and enable
Open-line detection simplifies cabling
High slew rate
High slew rate, int. caps, two shutdown
High slew rate, int. caps, three shutdown
High slew rate, int. caps, nine operating
High slew rate, selective half-chip enables
Available in quad flatpack package
MAX220–MAX249 +5V-Powered, Multichannel
RS-232 Drivers/Receivers
www.maximintegrated.com Maxim Integrated
37
Ordering Information (continued)
Selection Table
01,03,05 01,03,05 02 02 04 04
J16 L20 J18 L20 J18 L20
1 C1+ NC NC NC EN EN
2 V+ C1+ C1+ C1+ C1+ C1+
3 C1- V+ V+ V+ V+ V+
4 C2+ C1- C1- C1- C1- C1-
5 C2- C2+ C2+ C2+ C2+ C2+
6V- NC C2- NC C2- NC
7 T2OUT C2- V- C2- V- C2-
8 R2IN V- T2OUT V- T2OUT V-
9 R2OUT T2OUT R2IN T2OUT R2IN T2OUT
10 T2IN R2IN R2OUT R2IN R2OUT R2IN
01,03,05 01,03,05 02 02 04 04
J16 L20 J18 L20 J18 L20
11 T1IN NC T2IN NC T2IN NC
12 R1OUT R2OUT T1IN R2OUT T1IN R2OUT
13 R1IN T2IN R1OUT T2IN R1OUT T2IN
14 T1OUT T1IN R1IN T1IN R1IN T1IN
15 GND R1OUT T1OUT R1OUT T1OUT R1OUT
16 VCC NC GND R1IN GND R1IN
17 R1IN VCC T1OUT VCC T1OUT
18 T1OUT SHND GND SHND GND
19 GND VCC VCC
20 VCC SHND SHND
PACKAGE
TYPE
PACKAGE
CODE
OUTLINE
NO.
LAND
PATTERN NO.
14 PDIP P14+3
21-0043
16 PDIP P16+1
16 PDIP P16+2
16 PDIP P16+3
18 PDIP P18+5
20 PDIP P20+3
20 PDIP P20M+1
24 PDIP N24+3
24 PDIP P24M+1
21-0044
28 PDIP P28+2
40 PDIP P40+1
40 PDIP P40M+2
14 CERDIP J14-3
21-0045
16 CERDIP J16-3
18 CERDIP J18-2
20 CERDIP J20-2
24 CERDIP R24-4
16 SO(N) S16+3 21-0041 90-0097
16 SO(N) S16+5
PACKAGE
TYPE
PACKAGE
CODE
OUTLINE
NO.
LAND
PATTERN NO.
16 SO(W) W16+1
21-0042
90-010716 SO(W) W16+2
16 SO(W) W16+3
18 SO(W) W18+1 90-0181
20 SO(W) W20+3 90-0108
20 SO(W) W20M+1
24 SO(W) W24+2 90-0182
28 SO(W) W28+1
90-010928 SO(W) W28+2
28 SO(W) W28M+1
20 LCC L20+3 21-0658 90-0177
20 SSOP A20+1
21-0658
90-0094
24 SSOP A24+2 90-0110
28 SSOP A28+1 90-0095
16 TSSOP U16+1 90-0117
16 FPCK F16-3 21-0013
44 MQFP M44+5 21-0826 90-0169
44 PLCC Q44+1 21-0049 90-0236
44 PLCC Q44+2
MAX220–MAX249 +5V-Powered, Multichannel
RS-232 Drivers/Receivers
www.maximintegrated.com Maxim Integrated
38
Terminal Connections
Package Information
For the latest package outline information and land patterns (footprints), go to www.maximintegrated.com/packages. Note that a “+”,
“#”, or “-” in the package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing
pertains to the package regardless of RoHS status.
REVISION
NUMBER
REVISION
DATE DESCRIPTION PAGES
CHANGED
15 1/06 Added part information to the lead temperature in the Absolute Maximum Ratings
sections 2, 5, 8
16 7/10
Changed multiple packages to lead-free versions; updated/added notes 3, 4, 5, 7, and 8
to the Electrical Characteristics table; removed incorrect subscripting from all pin names
in the Electrical Characteristics table and Pin Configurations
1, 2–9, 17–36
17 1/15 Updated General Description and Benefits and Features sections 1
18 5/19 Add Terminal Connections table 38
Maxim Integrated cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim Integrated product. No circuit patent licenses
are implied. Maxim Integrated reserves the right to change the circuitry and specifications without notice at any time. The parametric values (min and max limits)
shown in the Electrical Characteristics table are guaranteed. Other parametric values quoted in this data sheet are provided for guidance.
Maxim Integrated and the Maxim Integrated logo are trademarks of Maxim Integrated Products, Inc.
MAX220–MAX249 +5V-Powered, Multichannel
RS-232 Drivers/Receivers
© 2019 Maxim Integrated Products, Inc.
39
Revision History
For pricing, delivery, and ordering information, please visit Maxim Integrated’s online storefront at https://www.maximintegrated.com/en/storefront/storefront.html.

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