TimerBlox: Monostable Pulse Generator (One Shot)

The LTC6993 is a monostable multivibrator (also known as a “one-shot” pulse generator) with a programmable pulse width of 1µs 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.

The output pulse is initiated by a transition on the trigger input (TRIG). Each part can be configured to generate positive or negative output pulses. The LTC6993 is available in four versions to provide different trigger signal polarity and retrigger capability.

The LTC6993 also offers the ability to dynamically adjust the width of the output pulse via a separate control voltage.

Device

Input Polarity

Retrigger

LTC6993-1

Rising-Edge

No

LTC6993-2

Rising-Edge

Yes

LTC6993-3

Falling-Edge

No

LTC6993-4

Falling-Edge

Yes

Applications

* Watchdog Timer

* Frequency Discriminators

* Missing Pulse Detection

* Envelope Detection

* High Vibration, High Acceleration Environments

* Portable and Battery-Powered Equipment

* Pulse Width Range: 1µs to 33.6 Seconds

* Configured with 1 to 3 Resistors

* Pulse Width Max Error:

* <2.3% for Pulse Width > 512µs

* <3.4% for Pulse Width of 8µs to 512µs

* <4.9% for Pulse Width of 1µs to 8µs

* Four LTC6993 Options Available:

* Rising-Edge or Falling-Edge Trigger

* Retriggerable or Non-Retriggerable

* Configurable for Positive or Negative Output Pulse