SNJ54AHC123AJ

Overview

The SNJ54AHC123AJ is a dual retriggerable monostable multivibrator from the AHC series, housed in a 16-pin ceramic DIP package. It operates within a supply voltage range of 2V to 5.5V and supports an operating temperature range of -55°C to 125°C. The device features Schmitt-trigger circuitry on A, B, and CLR inputs for slow input transition rates. It provides edge triggering from active-high or active-low gated logic inputs and includes glitch-free power-up reset on outputs.

Feature Summary

• Dual retriggerable monostable multivibrators designed for extended output pulse generation
• Schmitt-trigger circuitry on all inputs to handle slow transition rates without jitter
• Edge triggered operation utilizing active-high or active-low gated logic inputs
• Glitch-free power-up reset ensures defined output states during initialization

Applications

• Pulse width modulation circuits requiring precise timing control
• Debouncing switches to eliminate mechanical contact bounce noise
• Generating fixed time delays in digital logic sequences
• Frequency division and pulse stretching applications

Procurement Notes

Verify the specific ordering suffix 'J' corresponds to the 16-pin CDIP ceramic package when sourcing. Confirm that the component meets MIL-PRF-38535 requirements if military-grade reliability is necessary for the application. Ensure the design accounts for the recommended operating conditions regarding supply voltage and temperature ranges.

Selection Notes

Select this component when dual independent monostable circuits are required in a single package. The AHC series offers CMOS compatibility with high noise immunity. Consider the external timing components (resistor and capacitor) needed to set the desired pulse duration based on the application's frequency and duty cycle requirements.

Part Context

This part belongs to the SNx4AHC123A family of dual retriggerable monostable multivibrators. The 'SNJ' prefix indicates a Texas Instruments military-grade version in a ceramic DIP package. It shares functional characteristics with commercial variants like the SN74AHC123A but differs in packaging and environmental specifications.

Replacement Considerations

SNJ54AHC123AFK

FAQ

How is the output pulse duration determined?

The pulse duration is programmed by selecting external resistance and capacitance values connected between the Rext/Cext and Cext terminals.

Can the output pulse be terminated early?

Yes, driving the clear (CLR) input low will override the trigger inputs and terminate the output pulse immediately.