74HC423N,652

Overview

The NXP USA Inc. 74HC423N,652 is a dual retriggerable monostable multivibrator with reset, manufactured using high-speed silicon-gate CMOS technology. It operates within a supply voltage range of 2.0 V to 6.0 V and features Schmitt-trigger inputs for noise tolerance. The device provides two independent channels, each capable of generating output pulses controlled by external resistors and capacitors connected to dedicated timing pins. It supports direct reset functionality to terminate output pulses immediately.

Feature Summary

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

Applications

• Pulse width generation and timing circuits
• Debouncing switches or contacts
• Frequency division and pulse stretching

Procurement Notes

Verify the specific ordering suffix '652' against official manufacturer documentation to confirm package type and temperature range specifications. Ensure compatibility with system voltage levels and load requirements before procurement. Cross-reference datasheet revision history for any updates to electrical characteristics or pin configurations.

Selection Notes

Select this component when dual independent monostable channels are required in a single package. Consider the HC series for wider supply voltage flexibility compared to HCT variants. Evaluate external timing component values to achieve desired pulse widths, noting that minimum pulse width is determined by REXT and CEXT selections.

Part Context

This part belongs to the 74HC/HCT logic family, designed for general-purpose digital applications. It is functionally identical to the 74HC123 except it lacks triggering via the reset input. The DIP16 package variant offers through-hole mounting options suitable for prototyping and legacy board designs.

Replacement Considerations

The 74HC123 serves as a functional substitute but includes additional triggering capability via the reset input. Verify pinout compatibility and ensure the application does not rely on the distinct reset-triggering behavior unique to the 74HC423.