MC74AC161DG

Counter Dividers Overview

The MC74AC161DG is a high-speed synchronous modulo-16 binary counter manufactured by onsemi. It operates within a supply voltage range of 2.0 V to 6.0 V and features an asynchronous Master Reset input that overrides all other inputs to force outputs LOW. The device utilizes D-type edge-triggered flip-flops with parallel clocking, ensuring synchronous counting and loading. It includes two Count Enable inputs (CEP and CET) and a Terminal Count output for versatile multistage expansion. Packaged in a 16-lead SOIC (CASE 751B), it supports operation from -40°C to +85°C.

Counter Dividers Feature Summary

• Synchronous counting and presettable loading via parallel data inputs
• Asynchronous Master Reset function overriding all other control signals
• High-speed synchronous expansion capability using Terminal Count output
• Outputs capable of sourcing and sinking up to 24 mA

Counter Dividers Applications

• Programmable frequency dividers
• Synchronous multistage counters
• Digital timing sequences
• Event counting logic

Counter Dividers Procurement Notes

Verify the specific suffix 'D' corresponds to the SOIC-16 package configuration as defined in the datasheet ordering information. Confirm RoHS compliance status and lead-free marking requirements for the target assembly process. Ensure the design accommodates the asynchronous nature of the Master Reset signal regarding setup and hold times relative to the clock edge.

Counter Dividers Selection Notes

Select this component when a synchronous modulo-16 binary counter with asynchronous reset is required. The AC series offers a wider operating voltage range compared to ACT variants. Verify that the application does not require TTL-compatible inputs, which are specific to the ACT series. Consider the propagation delays and maximum count frequencies specified at the intended operating voltage and load conditions.

Counter Dividers Part Context

This part belongs to the MC74AC(T)161/163 family of synchronous binary counters. The 'AC' designation indicates standard CMOS performance with a broad voltage range, distinguishing it from the 'ACT' variant which provides TTL-compatible input thresholds. The device shares functional similarities with the MC74AC163 but differs in its reset mechanism, utilizing asynchronous rather than synchronous clearing.

Counter Dividers Replacement Considerations

Public confirmed substitute part numbers include CD74AC161M96 from Texas Instruments.