SN74AHC123AN

Overview

The SN74AHC123AN is a dual retriggerable monostable multivibrator from the Texas Instruments AHC logic series. It operates within a supply voltage range of 2V to 5.5V and features Schmitt-trigger circuitry on all inputs to accommodate slow transition rates. The device provides edge triggering from active-high or active-low gated logic inputs, allowing for flexible pulse generation. It includes an overriding clear function to terminate output pulses early and ensures glitch-free power-up reset states.

Feature Summary

• Dual retriggerable monostable multivibrators with Schmitt-trigger inputs
• Edge triggered from active-high or active-low gated logic inputs
• Overriding clear terminates output pulse
• Glitch-free power-up reset on outputs

Applications

• Pulse generation circuits
• Timing delay applications
• Debouncing switches
• Frequency division

Procurement Notes

Verify the specific ordering suffix against the manufacturer's official documentation to confirm package type, temperature range, and environmental compliance. Ensure that the selected variant matches the required operating conditions and pinout configuration for the target application design.

Selection Notes

Select this component when dual independent monostable circuits are required in a single package. The AHC series offers high-speed performance with low power consumption. Consider the PDIP-16 package for through-hole mounting requirements and verify compatibility with the system's supply voltage range.

Part Context

This part belongs to the SNx4AHC123A family of dual retriggerable monostable multivibrators. The 'N' suffix indicates a 16-pin Plastic Dual In-Line Package (PDIP). It is designed for general-purpose digital applications requiring precise timing control with external RC components.

Replacement Considerations

SN74AHCT123AN

FAQ

How is the output pulse duration determined?

The output 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, the overriding clear (CLR) input can be driven low during the output pulse to terminate it early.