74HCT423D,118

Overview

The 74HCT423D,118 is a dual retriggerable monostable multivibrator with reset from the HCT logic family. It operates within a supply voltage range of 4.5 V to 5.5 V and supports an ambient temperature range of -40 °C to +125 °C. The device features Schmitt-trigger inputs for noise tolerance and allows pulse width control via external resistor and capacitor components. It is housed in a 16-lead SSOP package.

Feature Summary

• Dual retriggerable monostable multivibrator architecture
• Schmitt-trigger action on trigger inputs for slow edge tolerance
• Direct active LOW reset input terminates output pulses 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 against current NXP documentation to confirm package type and temperature grade. Confirm availability status as discontinuation notices may apply to legacy logic families. Ensure design compliance with JEDEC standard no. 7A specifications before finalizing procurement.

Selection Notes

Select this component when dual independent monostable functions are required in a single package. 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 SSOP package fits the PCB layout constraints.

Part Context

This part belongs to the 74HCT423 family of dual retriggerable monostable multivibrators. It shares functional similarities with the 74HC423 but utilizes HCT input thresholds for TTL compatibility. The 'D' suffix indicates the SO16 plastic small outline package variant.

Replacement Considerations

The 74HC423D is functionally identical regarding pinout and logic behavior but differs in input voltage thresholds. Other manufacturers producing JEDEC-compliant 74HCT423 devices may serve as alternatives if electrical parameters match.