Maxim Distributor

RS-232 Transceivers


Maxim's true RS-232 transceivers use four 0.1 µF external capacitors


Maxim's RS-232 TransceiversMaxim's MAX3222/MAX3232/MAX3237/MAX3241 transceivers have a proprietary low-dropout transmitter output stage. This enables true RS-232 performance from a 3.0 V to 5.5 V supply with a dual charge pump. The devices require only four small, 0.1 µF external charge-pump capacitors. The MAX3222, MAX3232, and MAX3241 run at data rates of 120 kbps while maintaining RS-232 output levels. The MAX3237 runs at data rates of 250 kbps in the normal operating mode and 1 Mbps in the MegaBaud™ operating mode, while maintaining RS-232 output levels.

The MAX3222 and MAX3232 have two receivers and two drivers. The MAX3222 features a 1 µA shutdown mode that reduces power consumption and extends battery life in portable systems. Its receivers remain active in shutdown mode, allowing external devices such as modems to be monitored using only 1 µA supply current. The MAX3222 and MAX3232 are pin, package, and functionally compatible with the industry-standard MAX242 and MAX232, respectively.

The MAX3241 is a complete serial port (3 drivers/5 receivers) designed for notebook and sub-notebook computers. The MAX3237 (5 drivers/3 receivers) is ideal for fast modem applications. Both these devices feature a shutdown mode in which all receivers can remain active while using only 1 µA supply current. Receivers R1 (MAX3237/MAX3241) and R2 (MAX3241) have extra outputs in addition to their standard outputs. These extra outputs are always active, allowing external devices, such as a modem, to be monitored without forward biasing the protection diodes in circuitry that may have VCC completely removed.

Features
  • 3.0 V to 5.5 V
  • Low-power
  • True RS-232 transceivers using four 0.1 µF external capacitors
  • Up to 1 Mbps

Digi-Key P/N Manufacturer P/N Description
MAX3222 Series
MAX3222EETP+-ND MAX3222EETP+ IC TXRX RS232 250KBPS LP 20TQFN Datasheet
MAX3222CPN+-ND MAX3222CPN+ IC TXRX RS232 120KBPS LP 18-DIP Datasheet
MAX3222CAP+-ND MAX3222CAP+ IC TXRX RS-232 LP 20-SSOP
MAX3222CWN+-ND MAX3222CWN+ IC TXRX RS-232 LP 18-SOIC
MAX3222ECAP+-ND MAX3222ECAP+ IC TXRX RS-232 LP 20-SSOP Datasheet
View additional MAX3222 Series parts
MAX3232 Series
MAX3232ECUE+-ND MAX3232ECUE+ IC TXRX RS-232 LP 16-TSSOP Datasheet
MAX3232EETE+-ND MAX3232EETE+ IC TXRX RS232 250KBPS LP 16-TQFN
MAX3232EEUE+-ND MAX3232EEUE+ IC TXRX RS-232 LP 16-TSSOP
MAX3232CUE+-ND MAX3232CUE+ IC RS232 TRANSCVR 16-16TSSOP Datasheet
MAX3232CSE+-ND MAX3232CSE+ IC TXRX RS232 1MBPS LP 16-SOIC
View additional MAX3232 Series parts
MAX3237 Series
MAX3237ECAI+-ND MAX3237ECAI+ IC TXRX RS-232 LP 28-SSOP Datasheet
MAX3237EAI+-ND MAX3237EAI+ IC TXRX RS232 1MBPS LP 28-SSOP Datasheet
MAX3237EEAI+-ND MAX3237EEAI+ IC TXRX RS232 1MBPS 28-SSOP Datasheet
MAX3237CAI+-ND MAX3237CAI+ IC TXRX RS232 1MBPS LP 28-SSOP Datasheet
View additional MAX3237 Series parts
MAX3241 Series
MAX3241CUI+-ND MAX3241CUI+ IC TXRX RS-232 LP 28-TSSOP Datasheet
MAX3241ECAI+-ND MAX3241ECAI+ IC TXRX RS232 1MBPS 28-SSOP Datasheet
MAX3241EAI+-ND MAX3241EAI+ IC TXRX RS232 1MBPS LP 28-SSOP Datasheet
MAX3241EEUI+-ND MAX3241EEUI+ IC TXRX RS-232 LP 28-TSSOP Datasheet
MAX3241EEWI+-ND MAX3241EEWI+ IC TXRX RS-232 LP 28-SOIC
View additional MAX3241 Series parts