54LS670LMQB

Overview

The 54LS670LMQB is a Tri-State 4-by-4 Register File manufactured by National Semiconductor. It is organized as four words of four bits each, providing storage for digital logic applications. The component features tri-state outputs to facilitate bus-oriented architectures. It is designed for military-grade performance with an extended operating temperature range from -55 °C to 125 °C. The device utilizes a ceramic dual in-line package (CDIP) construction, ensuring durability and reliability in harsh environments.

Feature Summary

• Tri-state output capability for efficient bus interfacing
• Military-grade temperature rating for extreme environment operation
• Ceramic dual in-line packaging for enhanced physical robustness

Applications

• Military avionics systems requiring high reliability
• Spacecraft data processing units
• Industrial control systems in extreme temperatures

Procurement Notes

Verify the manufacturer origin carefully, as National Semiconductor assets were acquired by Texas Instruments. Confirm that the specific suffix 'LMQB' denotes the correct military grade and ceramic package variant required for your design. Ensure compatibility with existing inventory sources, as availability may vary between original stock and redistribution channels.

Selection Notes

Select this component when military-grade environmental tolerance and ceramic packaging are mandatory. It serves as a direct functional replacement for standard 54LS670 devices where higher thermal stability and mechanical ruggedness are required. Consider the pinout compatibility if substituting into existing PCB layouts designed for the LS series register files.

Part Context

This part belongs to the 54LS logic family, which offers low-power Schottky performance. The 54-series designation indicates military qualification standards, distinguishing it from commercial 74-series counterparts. National Semiconductor originally developed this line before its acquisition by Texas Instruments, which continues to support legacy components.