54F161/B2A

Overview

The 54F161/B2A is a synchronous four-bit binary counter manufactured by Rochester Electronics. It features an asynchronous master reset input and a synchronous parallel data load capability, allowing data to be loaded into the flip-flops on the positive edge of the clock when the load control is active. The device includes ripple carry outputs for cascading multiple counters to form wider binary counting sequences. Designed for military specifications, it operates within a defined temperature range suitable for harsh environments.

Feature Summary

• Synchronous four-bit binary counting architecture with dedicated ripple carry outputs
• Asynchronous master reset mechanism for immediate clearing of all flip-flop states
• Synchronous parallel data loading functionality controlled by specific enable inputs

Applications

• Military-grade digital timing and sequencing circuits
• Cascaded high-speed binary counting systems
• Radar and avionics signal processing logic

Procurement Notes

Verify component authenticity through official manufacturer documentation or authorized distribution channels. Confirm that the part meets the required MIL-PRF-38535 standards for Class Q or V applications. Ensure that the package marking and date codes align with the specific revision requested. Request full traceability records including lot history and test reports to validate compliance with military quality assurance protocols before finalizing procurement.

Selection Notes

Select this component when a robust, synchronous four-bit counter is required for mission-critical applications. It is appropriate for designs needing precise timing synchronization and reliable data loading under extreme environmental conditions. Consider the asynchronous reset feature for system initialization requirements. Evaluate the ripple carry outputs if extending the count width beyond four bits is necessary for the specific application logic.

Part Context

This component belongs to the SN54F series of high-speed Schottky logic devices. The '54' prefix indicates military-grade qualification, ensuring operation across a wider temperature range than commercial variants. Rochester Electronics provides lifecycle support for these legacy components, maintaining supply for defense and aerospace programs that require long-term availability of proven logic families.

Replacement Considerations

Direct replacements include other SN54F161 variants from original manufacturers such as Texas Instruments or National Semiconductor, provided they meet the same military qualification standards. Verify pin compatibility and electrical characteristics against the original datasheet. Alternative logic families may require circuit redesign due to differences in propagation delay and power consumption profiles.