54F191/QFA

Overview

The 54F191/QFA is a synchronous, positive edge-triggered binary counter belonging to the F/FAST logic series. It features a 4-bit bidirectional counting capability and operates using TTL technology. The device is housed in a PDSO16 package with dimensions of 5.30 mm width and 10.2 mm length, conforming to the EIAJ TYPE2 specification. It includes load/preset input functionality and is certified as lead-free and RoHS compliant.

Feature Summary

• Synchronous operation triggered by positive edges
• Bidirectional 4-bit binary counting capability
• Integrated load and preset input functions

Applications

• Digital data processing systems requiring synchronous counting
• Frequency division circuits within digital logic networks
• Timing sequence generation for control applications

Procurement Notes

Verify that the specific QFA suffix corresponds to the required commercial or military temperature range and packaging variant. Confirm that the component meets current environmental compliance standards, specifically regarding lead-free composition and RoHS directives, before finalizing procurement specifications.

Selection Notes

Select this component when a fast-switching, synchronous 4-bit counter is required. Ensure the system design supports positive edge triggering and utilizes TTL-compatible voltage levels. Verify that the SOP-16 package footprint aligns with the target PCB layout constraints.

Part Context

This part belongs to the 74F/54F family of high-speed logic devices manufactured by Rochester Electronics. These components are designed for applications demanding faster switching speeds than standard logic families while maintaining compatibility with established TTL interface standards.

Replacement Considerations

Compatible substitutes include other 54F-series synchronous counters such as the 54F193. Verify pinout compatibility and electrical characteristics against the original datasheet before substitution.