MM74HC191WMX

Counter Dividers Overview

The MM74HC191WMX is a high-speed silicon-gate CMOS device belonging to the 74HC series, manufactured by National Semiconductor. It functions as an asynchronously presettable 4-bit binary up/down counter. The component integrates four master/slave flip-flops with internal gating and steering logic to facilitate asynchronous parallel loading and synchronous count-up or count-down operations. It operates within a supply voltage range of 2 V to 6 V and supports a maximum counting rate of 24 MHz. The device is housed in a 16-SOIC surface-mount package and is designed for applications requiring reversible binary counting capabilities.

Counter Dividers Feature Summary

• Synchronous reversible counting capability allowing both up and down operations controlled by a single input
• Asynchronous parallel load feature enabling immediate data presetting independent of the clock signal
• Count enable control mechanism designed to support synchronous expansion for multi-stage counter systems

Counter Dividers Applications

• Binary counting sequences in digital logic circuits
• Frequency division networks utilizing synchronous expansion
• Data routing and address decoding systems requiring reversible counters

Counter Dividers Procurement Notes

Verify that the specific MM74HC191WMX variant matches the required 16-SOIC package dimensions and pinout configuration. Confirm compliance with JEDEC standard no. 7A specifications for electrical characteristics. Ensure the supply voltage range aligns with the target circuit design requirements before integration.

Counter Dividers Selection Notes

Select this component when a synchronous 4-bit binary counter with reversible direction control is required. It serves as a suitable alternative to low-power Schottky TTL (LSTTL) counterparts due to its pin compatibility and CMOS power efficiency. Consider the 2 V to 6 V operating range and 24 MHz speed limit when evaluating system timing constraints.

Counter Dividers Part Context

This part belongs to the 74HC family of high-speed CMOS logic devices. These components are widely recognized for their compatibility with LSTTL interfaces while offering lower power dissipation. The MM74HC191WMX specifically addresses the need for compact, surface-mountable reversible counters in modern electronic designs.

Counter Dividers Replacement Considerations

The 74HC191D and 74HC191PW are documented equivalents from NXP Semiconductors. Verify pinout and electrical parameter alignment before substituting these parts.