MC74AC161DR2

Counter Dividers Overview

The MC74AC161DR2G is a high-speed synchronous modulo-16 binary counter manufactured by onsemi in a SOIC-16 package. It features asynchronous Master Reset, parallel data inputs, and two count enable inputs for versatile multistage configurations. Operating within a supply voltage range of 2.0 V to 6.0 V, it supports a typical count rate of 125 MHz at 5.0 V with outputs capable of sourcing or sinking 24 mA.

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.
• Terminal Count output facilitates the expansion into synchronous multistage counters.

Counter Dividers Applications

• Programmable frequency dividers
• Synchronous multistage counter systems
• Digital timing and sequencing circuits

Counter Dividers Procurement Notes

Verify the specific ordering suffix 'DR2G' corresponds to the SOIC-16 tape and reel packaging configuration. Confirm that the device code matches the exact logic family variant required, as reset behavior differs between AC and ACT series counterparts.

Counter Dividers Selection Notes

Select this component when an asynchronous reset mechanism is required for immediate output clearing. Ensure the application operates within the specified 2.0 V to 6.0 V supply range and accounts for the 50 pF load capacitance conditions defined in the AC characteristics tables.

Counter Dividers Part Context

This part belongs to the MC74AC161/ACT161 and MC74AC163/ACT163 family of synchronous presettable binary counters. The AC series utilizes standard CMOS technology, while the ACT series offers TTL-compatible input thresholds for easier interfacing with legacy logic families.

Counter Dividers Replacement Considerations

MC74AC163DR2G: Features synchronous reset instead of asynchronous master reset.

Counter Dividers FAQ

How does the reset function differ between the MC74AC161 and MC74AC163?

The MC74AC161 utilizes an asynchronous Master Reset (MR) that forces outputs low immediately regardless of the clock. The MC74AC163 uses a Synchronous Reset (SR) that clears outputs on the rising edge of the clock pulse.

Can the Terminal Count output be used as a clock signal?

No, the Terminal Count output is subject to decoding spikes due to internal race conditions and is not recommended for use as a clock or asynchronous reset source.