74HCT423N,112

Overview

The NXP USA Inc. 74HCT423N,112 is a dual retriggerable monostable multivibrator with reset, housed in a 16-lead plastic dual in-line package (DIP16). It operates within a supply voltage range of 4.5 V to 5.5 V and supports an ambient temperature range from -40 °C to +125 °C. The device features Schmitt-trigger action on trigger inputs for noise immunity and allows pulse width control via external resistor and capacitor components.

Feature Summary

• Dual retriggerable monostable multivibrator architecture
• Schmitt-trigger action on all inputs except direct reset
• Direct reset input terminates output pulse immediately
• Pin compatible with Low power Schottky TTL (LSTTL)

Applications

• Pulse generation circuits
• Timing delay applications
• Debouncing switches

Procurement Notes

Verify the specific ordering suffix '112' against current manufacturer documentation to confirm packaging and compliance status. Confirm that the DIP16 package variant matches the required mechanical footprint for the target PCB layout. Ensure design specifications align with the HCT logic family voltage requirements.

Selection Notes

Select this component when a dual-channel monostable multivibrator with immediate reset capability is required. The HCT series ensures compatibility with standard TTL logic levels. Verify that the external timing components can support the desired pulse width range and that the operating temperature environment falls within the specified industrial limits.

Part Context

This part belongs to the 74HC/HCT423 series of high-speed Si-gate CMOS devices. It is functionally identical to the 74HC123 and 74HCT123, with the distinction that the 74HCT423 cannot be triggered via the reset input. The series complies with JEDEC standard no. 7A.

Replacement Considerations

74HC423N,118

FAQ

How does the 74HCT423 differ from the 74HCT123?

The 74HCT423 is identical to the 74HCT123 except that it cannot be triggered via the reset input.

What provides noise immunity for the trigger inputs?

The nA and nB inputs feature Schmitt-trigger action, making them highly tolerant to slower input rise and fall times.