54LS163AFMQB

Overview

The 54LS163AFMQB is a synchronous 4-bit binary counter manufactured by National Semiconductor. It operates within a supply voltage range of 4.5 V to 5.5 V and supports a maximum frequency of 25 MHz at nominal supply. The device utilizes positive edge triggering and features a load/preset input for bidirectional control capabilities in digital logic circuits. Packaged in a 16-pin flatpack (FL16) ceramic housing, it is designed for military and aerospace applications with an operating temperature range from -55 °C to 125 °C.

Feature Summary

• Synchronous 4-bit binary counting architecture
• Positive edge trigger mechanism
• Integrated load/preset input functionality

Applications

• Digital logic circuit counting operations
• Frequency division applications
• Timing control systems

Procurement Notes

Verify the specific suffix MQB confirms the flatpack package style and ceramic construction. Ensure the component meets MIL-STD-883 Class C screening requirements if intended for military or aerospace use. Confirm RoHS compliance status as lead-free variants exist alongside non-compliant versions depending on production batch and manufacturer specifications.

Selection Notes

Select this component when a synchronous 4-bit counter with preset capability is required for high-reliability environments. The LS-TTL technology ensures compatibility with standard logic families while offering improved speed over standard TTL. The ceramic flatpack package provides robustness against harsh environmental conditions compared to plastic alternatives.

Part Context

This part belongs to the 54LS series of logic integrated circuits produced by National Semiconductor, now part of Texas Instruments. The 54-series designation indicates military-grade quality standards, distinguishing it from the commercial 74-series counterparts. The 54LS163 variant specifically provides synchronous operation with a parallel load feature, differing from asynchronous counters like the 54LS161.

Replacement Considerations

Direct substitutes include the 54LS163AJ and 54LS163ALMQB. Verify pinout compatibility and electrical characteristics before substitution. The 54LS169W serves as a related up/down counter alternative but differs in directionality control.