TimerBlox™ Overview

Looking for a VCO, PWM generator, one-shot, delay, or other timing circuit? Before grabbing a timer or a microcontroller, consider one of Linear Technology’s dedicated TimerBlox timing circuits. Using a built-in oscillator, these simple and accurate devices provide timing functions from μHz to MHz. No elaborate circuitry, memory or programming effort, just set and forget. It’s about time – your time.

TimerBlox devices combine an accurate programmable oscillator with precision circuitry and logic.  No capacitors, no crystals, no microcontroller and no programming are required.   Source and sink capability of 20mA enables the TimerBlox parts to directly drive opto-isolators and transformers for electrical isolation.  The small footprint allows each TimerBlox device to be placed at the point of use, providing an ideal solution for space-limited applications.

To speed and simplify your design process, TimerBlox Designer is an Excel based selection and synthesis tool that allows you to choose and configure the TimerBlox part best suited for your application.

Part Number Function Details Operating Range Demo Board
LTC6990 VCO Configurable Gain & Voltage Range 488Hz to 2MHz DC1562A-A
LTC6991 LF Clock Period from 1ms up to 9.5 hours 29μHz to 977Hz DC1562A-B
LTC6992-1 PWM 0% to 100% Pulse Width Control 3.8Hz to 1MHz DC1562A-C
LTC6992-2 5% to 95% Pulse Width Control 3.8Hz to 1MHz DC1562A-D
LTC6992-3 0% to 95% Pulse Width Control 3.8Hz to 1MHz DC1562A-E
LTC6992-4 5% to 100% Pulse Width Control 3.8Hz to 1MHz DC1562A-F
LTC6993-1 One-Shot Rising Edge Trigger 1μs to 34s DC1562A-G
LTC6993-2 Rising Edge Trigger, Retriggerable 1μs to 34s DC1562A-H
LTC6993-3 Falling Edge Trigger 1μs to 34s DC1562A-I
LTC6993-4 Falling Edge Trigger, Retriggerable 1μs to 34s DC1562A-J
LTC6994-1 Delay Rising or Falling Edge Trigger 1μs to 34s DC1562A-K
LTC6994-2 Rising & Falling Edge Trigger 1μs to 34s DC1562A-L
SC-KIT-TBX-ND Kit TIMERBLOX SAMPLE KIT -  

LTC6990 VCO

Linear Technology's LTC6990 is a precision silicon oscillator with a programmable frequency range of 488Hz to 2MHz. It can be used as a fixed-frequency or voltage-controlled oscillator (VCO). The LTC6990 is part of the TimerBlox family of versatile silicon timing devices. A single resistor, RSET, programs the LTC6990’s internal master oscillator frequency. This master oscillator and an internal frequency divider, NDIV, programmable to eight settings from 1 to 128, determine the output frequency.

Optionally, a second resistor at the SET input provides linear voltage control of the output frequency and can be used for frequency modulation. A narrow or wide VCO tuning range can be configured by the appropriate selection of the two resistors. The LTC6990 includes an enable function that is synchronized with the master oscillator to ensure clean, glitch-free output pulses. The disabled output can be configured to be high impedance or forced low. Datasheet

Features:

  • Fixed-frequency or voltage-controlled operation
    • Fixed: single resistor programs frequency with <2.2% maximum error
    • VCO: two resistors set VCO center frequency and tuning range
  • Frequency range: 488Hz to 2MHz
  • 2.25V to 5.5V single supply operation
  • Output enable (selectable low or hi-Z when disabled)
  • 72μA supply current at 100kHz
  • 500μs start-up time
  • VCO bandwidth >300kHz at 1MHz
  • CMOS logic output sources/sinks 20mA
  • 50% duty cycle square wave output
  • –40°C to 125°C operating temperature range
Digi-Key Part Number Manufacturer Part Number Description
LTC6990CDCB#TRMPBFCT-ND LTC6990CDCB#TRMPBF IC MPU SUPERVISORY 6DFN
LTC6990CS6#TRMPBFCT-ND LTC6990CS6#TRMPBF IC MPU SUPERVISORY TSOT23-6
LTC6990IS6#TRMPBFCT-ND LTC6990IS6#TRMPBF IC TIMERBLOX VCO TSOT23-6
LTC6990HS6#TRMPBFCT-ND LTC6990HS6#TRMPBF IC TIMERBLOX VCO TSOT23-6
DC1562A-A-ND DC1562A-A BOARD EVAL LTC6990
SC-KIT-TBX-ND SC-KIT-TBX TIMERBLOX SAMPLE KIT

View all LTC6990 products

LTC6991 μHz Clock

Linear Technology's LTC6991 is a silicon oscillator with a programmable period range of 1.024ms to 9.54 hours (29.1μHz to 977Hz) that is specifically intended for long duration timing events. The LTC6991 is part of the TimerBlox™ family of versatile silicon timing devices.

A single resistor, RSET, programs the LTC6991’s internal master oscillator frequency. The output clock period is determined by this master oscillator and an internal frequency divider, NDIV, programmable to eight settings from 1 to 2²¹. Datasheet

Features:

  • Internal oscillator
    • No crystal
    • No timing caps
  • Simple setup using 1 to 3 resistors
    • Period range: 1ms to 9.5 hours
    • <1.5% maximum error
  • Square wave output with 50% duty cycle
  • Output reset function
  • 55μA to 80μA supply current
  • 500μs start-up time
  • 2.25V to 5.5V single supply operation
  • CMOS output driver sources/sinks 20mA
  • –40°C to 125°C operating temperature range
Digi-Key Part Number Manufacturer Part Number Description
LTC6991CDCB#TRMPBFCT-ND LTC6991CDCB#TRMPBF IC TIMERBLOX OSCILLATOR 6-DFN
LTC6991CS6#TRMPBFCT-ND LTC6991CS6#TRMPBF IC TIMERBLOX OSCILLATOR TSOT23-6
LTC6991IS6#TRMPBFCT-ND LTC6991IS6#TRMPBF IC TIMERBLOX OSCILLATOR TSOT23-6
LTC6991HS6#TRMPBFCT-ND LTC6991HS6#TRMPBF IC TIMERBLOX OSCILLATOR TSOT23-6
DC1562A-B-ND DC1562A-B BOARD EVAL LTC6991
SC-KIT-TBX-ND SC-KIT-TBX TIMERBLOX SAMPLE KIT

View all LTC6991 products

LTC6992 PWM

Linear Technology's LTC6992 is a silicon oscillator with an easy-to-use analog voltage-controlled pulse width modulation (PWM) capability. The LTC6992 is part of the TimerBlox™ family of versatile silicon timing devices.

A single resistor, RSET, programs the LTC6992’s internal master oscillator frequency. This master oscillator and an internal frequency divider, NDIV, programmable to eight settings from 1 to 16384, determine the output frequency. Datasheet

Features:

  • Pulse width modulation (PWM) controlled by simple 0V to 1V analog input
  • Four available options define duty cycle limits
    • Minimum duty cycle at 0% or 5%
    • Maximum duty cycle at 95% or 100%
  • Frequency range: 3.81Hz to 1MHz
  • Configured with 1 to 3 resistors
  • <1.7% maximum frequency error
  • PWM duty cycle error <3.7% maximum
  • Frequency modulation (VCO) capability
  • 2.25V to 5.5V single supply operation
  • 115μA supply current at 100kHz
  • 500μs start-up time
  • CMOS output driver sources/sinks 20mA
  • –40°C to 125°C operating temperature range
Digi-Key Part Number Manufacturer Part Number Description
LTC6992CS6-1#TRMPBFCT-ND LTC6992CS6-1#TRMPBF IC OSC SILICON 1MHZ TSOT23-6
LTC6992CDCB-1#TRMPBFCT-ND LTC6992CDCB-1#TRMPBF IC OSC SILICON 1MHZ 6-DFN
LTC6992IS6-3#TRMPBFCT-ND LTC6992IS6-3#TRMPBF IC OSC SILICON 1MHZ TSOT23-6
LTC6992HS6-2#TRMPBFCT-ND LTC6992HS6-2#TRMPBF IC OSC SILICON 1MHZ TSOT23-6
LTC6992HS6-1#TRMPBFCT-ND LTC6992HS6-1#TRMPBF IC OSC SILICON 1MHZ TSOT23-6
LTC6992CDCB-4#TRMPBFCT-ND LTC6992CDCB-4#TRMPBF IC OSC SILICON 1MHZ 6-DFN
LTC6992CDCB-3#TRMPBFCT-ND LTC6992CDCB-3#TRMPBF IC OSC SILICON 1MHZ 6-DFN
LTC6992CS6-4#TRMPBFCT-ND LTC6992CS6-4#TRMPBF IC OSC SILICON 1MHZ TSOT23-6
LTC6992CDCB-2#TRMPBFCT-ND LTC6992CDCB-2#TRMPBF IC OSC SILICON 1MHZ 6-DFN
LTC6992CS6-3#TRMPBFCT-ND LTC6992CS6-3#TRMPBF IC OSC SILICON 1MHZ TSOT23-6
LTC6992CS6-2#TRMPBFCT-ND LTC6992CS6-2#TRMPBF IC OSC SILICON 1MHZ TSOT23-6
LTC6992IS6-4#TRMPBFCT-ND LTC6992IS6-4#TRMPBF IC OSC SILICON 1MHZ TSOT23-6
LTC6992HS6-4#TRMPBFCT-ND LTC6992HS6-4#TRMPBF IC OSC SILICON 1MHZ TSOT23-6
LTC6992HS6-3#TRMPBFCT-ND LTC6992HS6-3#TRMPBF IC OSC SILICON 1MHZ TSOT23-6
LTC6992IS6-2#TRMPBFCT-ND LTC6992IS6-2#TRMPBF IC OSC SILICON 1MHZ TSOT23-6
LTC6992IS6-1#TRMPBFCT-ND LTC6992IS6-1#TRMPBF IC OSC SILICON 1MHZ TSOT23-6
DC1562A-C-ND DC1562A-C BOARD EVAL LTC6992-1
DC1562A-D-ND DC1562A-D BOARD EVAL LTC6992-2
DC1562A-E-ND DC1562A-E BOARD EVAL LTC6992-3
DC1562A-F-ND DC1562A-F BOARD EVAL LTC6992-4
SC-KIT-TBX-ND SC-KIT-TBX TIMERBLOX SAMPLE KIT

View all LTC6992 products

LTC6993 One-Shot

Linear Technology's LTC6993 is a monostable multivibrator (also known as a “one-shot” pulse generator) with a programmable pulse width of 1 µs to 33.6 seconds. The LTC6993 is part of the TimerBlox™ family of versatile silicon timing devices. A single resistor, RSET, programs an internal master oscillator frequency, setting the LTC6993’s time base. The output pulse width is determined by this master oscillator and an internal clock divider, NDIV, programmable to eight settings from 1 to 2²¹.   LTC6993 Datasheet

Features & Applications:

  • Pulse width range: 1 µs to 33.6 seconds
  • Configured with 1 to 3 resistors
  • Pulse width max error:
    • <2.3% for pulse width > 512 µs
    • <3.4% for pulse width of 8 µs to 512 µs
    • <4.9% for pulse width of 1 µs to 8 µs
  • Four LTC6993 options available:
    • Rising-edge or falling-edge trigger
    • Retriggerable or non-retriggerable
  • Configurable for positive or negative output pulse
  • Fast recovery time
  • 2.25 V to 5.5 V single supply operation
  • 70 µA supply current at 10 µs pulse width
  • 500 µs start-up time
  • Watchdog timer
  • Frequency discriminators
  • Missing pulse detection
  • Envelope detection
  • High vibration, high acceleration environments
  • Portable and battery-powered equipment
Digi-Key Part Number Manufacturer Part Number Description
LTC6993CDCB-1#TRMPBFCT-ND LTC6993CDCB-1#TRMPBF IC MONOSTABLE MULTIVIBRATOR 6DFN
LTC6993CDCB-2#TRMPBFCT-ND LTC6993CDCB-2#TRMPBF IC MONOSTABLE MULTIVIBRATOR 6DFN
LTC6993CDCB-3#TRMPBFCT-ND LTC6993CDCB-3#TRMPBF IC MONOSTABLE MULTIVIBRATOR 6DFN
LTC6993CDCB-4#TRMPBFCT-ND LTC6993CDCB-4#TRMPBF IC MONOSTABLE MULTIVIBRATOR 6DFN
LTC6993CS6-1#TRMPBFCT-ND LTC6993CS6-1#TRMPBF IC MONO MULTIVIBRATOR TSOT23-6
LTC6993CS6-2#TRMPBFCT-ND
LTC6993CS6-2#TRMPBF
IC MONO MULTIVIBRATOR TSOT23-6
LTC6993CS6-3#TRMPBFCT-ND LTC6993CS6-3#TRMPBF IC MONO MULTIVIBRATOR TSOT23-6
LTC6993CS6-4#TRMPBFCT-ND LTC6993CS6-4#TRMPBF IC MONO MULTIVIBRATOR TSOT23-6
DC1562A-G-ND DC1562A-G BOARD EVAL LTC6993-1
DC1562A-H-ND DC1562A-H BOARD EVAL LTC6993-2
DC1562A-I-ND DC1562A-I BOARD EVAL LTC6993-3
DC1562A-J-ND DC1562A-J BOARD EVAL LTC6993-4
SC-KIT-TBX-ND SC-KIT-TBX TIMERBLOX SAMPLE KIT

View all LTC6993 products

LTC6994 Delay

The LTC6994 is a programmable delay block with a range of 1μs to 33.6 seconds. The LTC6994 is part of the TimerBlox family of versatile silicon timing devices.

A single resistor, RSET, programs an internal master oscillator frequency, setting the LTC6994’s time base. The input-to-output delay is determined by this master oscillator and an internal clock divider, NDIV, programmable to eight settings from 1 to 221.

The output (OUT) follows the input (IN) after delaying the rising and/or falling transitions. The LTC6994-1 will delay the rising or falling edge. The LTC6994-2 will delay both transitions, and adds the option to invert the output.

The LTC6994 also offers the ability to dynamically adjust the delay time via a separate control voltage. LTC6994 Datasheet

Features & Applications:

  • Delay Range: 1μs to 33.6 Seconds
  • Configured with 1 to 3 Resistors
  • Delay Max Error:
    – <2.3% for Delay > 512μs
    – <3.4% for Delay of 8μs to 512μs
    – <5.1% for Delay of 1μs to 8μs
  • Delay One or Both Rising/Falling Edges
  • 2.25V to 5.5V Single Supply Operation
  • 70μA Supply Current at 10μs Delay
  • 500μs Start-Up Time
  • CMOS Output Driver Sources/Sinks 20mA
  • –55°C to 125°C Operating Temperature Range
  • Available in Low Profile (1mm) SOT-23 (ThinSOT™) and 2mm × 3mm DFN
  • Noise Discriminators/Pulse Qualifiers
  • Delay Matching
  • Switch Debouncing
  • High Vibration, High Acceleration Environments
  • Portable and Battery-Powered Equipment
Digi-Key Part Number Manufacturer Part Number Description
LTC6994CS6-1#TRMPBFCT-ND LTC6994CS6-1#TRMPBF IC TIMERBLOX DELAY R/F TSOT23-6
LTC6994CS6-2#TRMPBFCT-ND LTC6994CS6-2#TRMPBF IC TIMERBLOX DELAY R/F TSOT23-6
LTC6994CDCB-1#TRMPBFCT-ND LTC6994CDCB-1#TRMPBF IC TIMERBLOX DELAY R/F 6-DFN
LTC6994CDCB-2#TRMPBFCT-ND LTC6994CDCB-2#TRMPBF IC TIMERBLOX DELAY R/F 6-DFN
DC1562A-K-ND DC1562A-K BOARD EVAL LTC6994-1
DC1562A-L-ND DC1562A-L BOARD EVAL LTC6994-2
SC-KIT-TBX-ND SC-KIT-TBX TIMERBLOX SAMPLE KIT

View all LTC6994 products