MC74AC161D

Counter Dividers Overview

The MC74AC161D is a high-speed synchronous modulo-16 binary counter manufactured by onsemi in a 16-pin SOIC package. It features synchronous preset capability, two count enable inputs (CEP and CET), and a terminal count output for multistage expansion. The device includes an asynchronous Master Reset input that forces outputs LOW. Recommended operating voltage ranges from 2.0 V to 6.0 V for AC logic. Typical count rates reach 125 MHz at 5.0 V supply.

Counter Dividers Feature Summary

• Synchronous counting and loading operations ensure accurate state transitions aligned with clock edges.
• Asynchronous Master Reset input overrides all other functions to force outputs low immediately.
• Outputs provide high drive capability with source and sink currents of 24 mA.

Counter Dividers Applications

• Programmable frequency dividers
• Synchronous multistage counters
• Digital timing sequences

Counter Dividers Procurement Notes

Verify the specific suffix 'D' indicates the SOIC-16 package variant when sourcing replacements. Confirm the manufacturer is onsemi or authorized distributor. Check RoHS compliance status as specifications apply to both standard and lead-free devices. Ensure the asynchronous reset function matches system requirements rather than the synchronous reset found in the 163 series.

Counter Dividers Selection Notes

Select this component for applications requiring synchronous presettable binary counting with asynchronous reset functionality. The AC logic family offers higher speed performance compared to standard TTL equivalents. Verify that the 16-pin surface mount package fits the PCB layout constraints. Consider the 24 mA output drive strength for direct load interfacing without additional buffering.

Counter Dividers Part Context

This part belongs to the MC74AC161/ACT161 and MC74AC163/ACT163 family of synchronous presettable binary counters. The AC variant provides high-speed operation suitable for modern digital systems. The D suffix specifically denotes the plastic small-outline package. These devices are designed for versatile use in programmable dividers and multi-stage counting applications.

Counter Dividers Replacement Considerations

MC74ACT161D

Counter Dividers FAQ

What is the difference between the MC74AC161 and MC74AC163?

The MC74AC161 features an asynchronous Master Reset input that immediately forces outputs low. The MC74AC163 has a synchronous Reset input that clears outputs on the rising edge of the clock pulse.

How does the Terminal Count output function?

The TC output goes HIGH when the counter reaches state 15 and CET is HIGH. It can be used with CEP and CET inputs to form synchronous multistage counters.