MM74HC123ASJX

Overview

The MM74HC123ASJX is a dual retriggerable monostable multivibrator manufactured by onsemi, utilizing advanced silicon-gate CMOS technology. It features two independent circuits with negative (A) and positive (B) transition triggered inputs, plus a clear input for resetting the output pulse. The device operates within a supply voltage range of 2V to 6V and supports propagation delays up to 48 ns at 4.5V. It includes Schmitt trigger inputs to tolerate slow rise and fall times, ensuring stable operation across wide temperature ranges from -40°C to +85°C.

Feature Summary

• Dual retriggerable monostable multivibrator architecture allowing pulse extension upon repeated triggering.
• Schmitt trigger inputs on A and B channels provide tolerance for slow signal transitions.
• Direct reset capability via the Clear input to terminate output pulses immediately.
• CMOS construction ensures low quiescent current consumption and high noise immunity.

Applications

• Pulse width modulation generation
• Timing delay circuits
• Debouncing switches

Procurement Notes

Verify the specific ordering suffix 'SJX' against manufacturer documentation to confirm package type and tape/reel configuration. Confirm end-of-life status or obsolescence notices prior to final design approval. Ensure compatibility with existing PCB footprints for the SOP-16 package variant.

Selection Notes

Select this component when dual independent timing channels are required in a single package. Consider the HC series logic family for its balance of speed and power consumption compared to standard TTL. Verify that the external RC timing components meet the minimum resistance requirements relative to the supply voltage to ensure proper operation.

Part Context

This part belongs to the MM74HC123A series of dual monostable multivibrators. It is functionally compatible with other devices in the 74HC123 family but may differ in physical packaging or manufacturing origin depending on the specific suffix assigned by the distributor or manufacturer.

Replacement Considerations

Check datasheets for pinout compatibility before substituting with other 74HC123 variants. Verify electrical characteristics such as propagation delay and supply voltage ranges match the original design requirements.