MC74AC163MEL

Counter Dividers Overview

The MC74AC163MEL 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 supports a typical count rate of 140 MHz at 5.0 V. The device features a synchronous reset input that overrides counting and parallel loading, allowing outputs to be simultaneously reset on the rising edge of the clock. It includes two types of Count Enable inputs (CEP and CET) plus a Terminal Count output for versatile multistage configurations. Packaged in an EIAJ-16 surface-mount format.

Counter Dividers Feature Summary

• Synchronous Reset Input: Overrides counting and parallel loading to allow simultaneous output reset on the clock rising edge.
• High-Speed Synchronous Expansion: Supports programmable dividers and multistage counters via dedicated enable inputs and terminal count output.
• Robust Output Drive: Provides source and sink currents up to 24 mA for direct load driving.

Counter Dividers Applications

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

Counter Dividers Procurement Notes

Verify component authenticity through official manufacturer channels or authorized distributors. Confirm RoHS compliance status as specific Pb-free orderable part numbers may differ from standard listings. Ensure the ordering suffix matches the required package type and shipping configuration before finalizing procurement.

Counter Dividers Selection Notes

Select this component when a synchronous reset mechanism is required rather than asynchronous clearing. It is suitable for designs needing high-speed operation up to 140 MHz with a wide supply voltage tolerance. Verify interface compatibility with existing logic families and ensure the EIAJ-16 package fits the target PCB layout constraints.

Counter Dividers Part Context

This device belongs to the MC74AC(T)161/163 family of synchronous presettable binary counters. While the MC74AC161 variant utilizes an asynchronous Master Reset, the MC74AC163 specifically implements a Synchronous Reset. Both share identical counting logic, pinouts, and expansion capabilities, differing primarily in their reset behavior relative to the clock signal.

Counter Dividers Replacement Considerations

CD74AC163M (Texas Instruments)

Counter Dividers FAQ

How does the reset function of the MC74AC163 differ from the MC74AC161?

The MC74AC163 features a Synchronous Reset input that clears outputs on the rising edge of the clock. In contrast, the MC74AC161 uses an Asynchronous Master Reset that immediately forces outputs low regardless of the clock state.

What is the maximum operating frequency for this counter?

At a supply voltage of 5.0 V, the device supports a typical maximum count frequency of 140 MHz.