MM74HC123AMTC

Overview

The MM74HC123AMTC is a dual retriggerable monostable multivibrator utilizing advanced silicon-gate CMOS technology. It operates within a supply voltage range of 2V to 6V and supports an operating temperature from -40°C to +85°C. The device features typical propagation delays of 25 ns, maximum quiescent current of 80 µA, and maximum input current of 1 µA. It provides a fanout of 10 LS-TTL loads and generates output pulses ranging from 400 ns to infinity based on external RC components.

Feature Summary

• Dual retriggerable monostable multivibrator architecture with independent timing circuits
• Schmitt trigger inputs allow for slow rise and fall times up to one second
• Retriggerable operation extends output pulse width upon subsequent valid triggers
• Outputs resettable via active-low clear input during pulse generation

Applications

• Pulse generation and timing control in digital systems
• Debouncing mechanical switches
• Frequency division and pulse stretching
• Timing delay circuits requiring wide pulse width ranges

Procurement Notes

Verify the specific package marking and manufacturer origin, as this component was originally manufactured by Fairchild Semiconductor before its acquisition by onsemi. Confirm RoHS compliance status through official datasheets or material declarations, as legacy stock may vary. Ensure the ordering code matches the TSSOP-16 configuration required for your PCB footprint.

Selection Notes

Select this component when a dual-channel monostable solution with Schmitt trigger inputs is required. It is suitable for applications needing wide pulse width stability over temperature and supply variations. Consider the 2V to 6V operating range for compatibility with various logic families. Verify that the external RC timing components meet the minimum resistance requirements relative to the supply voltage.

Part Context

This part belongs to the MM74HC123A series of high-speed monostable multivibrators. It utilizes silicon-gate CMOS technology to achieve speeds comparable to low-power Schottky TTL while maintaining low power consumption. The device includes two independent one-shots with both negative (A) and positive (B) transition triggered inputs.

Replacement Considerations

74VHC123AMTCX