74HC5555D,112

Overview

The Nexperia 74HC5555D,112 is a precision programmable delay timer featuring a 24-stage binary counter and an integrated oscillator. It supports RC, crystal, or external clock inputs with a divide-by range of 2 to 2^24. The device offers positive and negative edge triggering, retriggerable or non-retriggerable modes, and Schmitt trigger inputs for noise immunity. Operating on a 2.0 V to 6.0 V supply, it provides high-precision digital timing with automatic power-on reset and direct drive capability for power transistors.

Feature Summary

• 24-stage binary counter with programmable delay from 100 ns up to 2^24 divisions
• Three oscillator modes: RC, crystal, or external clock input
• Positive and negative edge triggered with Schmitt trigger action on inputs A and B
• Retriggerable/non-retriggerable selection via RTR/RTR pin

Applications

• Motor control systems
• Precision timing circuits
• Delay circuits
• Domestic appliances

Procurement Notes

Verify the ordering suffix '112' against official Nexperia documentation to confirm specific packaging details such as tape and reel specifications. Ensure compatibility with the SO16 (SOT109-1) package dimensions and thermal requirements for the intended PCB layout.

Selection Notes

Select this component when precise digital timing is required over wide ranges. Choose between RC, crystal, or external oscillation based on frequency stability needs. Consider the divide-by ratio and maximum clock frequency limits to ensure synchronization accuracy at the desired output pulse width.

Part Context

This part belongs to the 74HC series of high-speed CMOS logic devices. It is functionally compatible with other 74HC family timers but offers extended programmability through its 24-stage counter. The device complies with JEDEC standard no. 7A and features ESD protection exceeding 2000 V HBM.

Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided source material.