DM54LS257AJ/883

Overview

The DM54LS257AJ/883C is a military-grade quad 2-line to 1-line data selector/multiplexer manufactured by National Semiconductor. It utilizes Low-Power Schottky (LS) TTL technology and features tri-state outputs for bus-oriented applications. The device is housed in a 14-pin ceramic dual in-line package (DIP) with a gold-tin terminal finish, designed for MIL-STD-883 Class C screening. It operates on a nominal 5 V supply voltage within an extended temperature range of -55 °C to 125 °C.

Feature Summary

• Provides four independent multiplexing channels with selectable data inputs
• Features tri-state outputs to facilitate direct connection to system buses
• Constructed with Low-Power Schottky TTL circuitry for reduced power consumption
• Designed for high reliability under extreme environmental conditions

Applications

• Military avionics signal routing systems
• Spacecraft data acquisition and switching matrices
• High-reliability industrial control logic interfaces
• Defense communication equipment data selectors

Procurement Notes

Verify the specific suffix '883C' indicates MIL-STD-883 Class C screening requirements. Confirm the material composition matches the ceramic package specification. Ensure the manufacturer source is authorized for military-grade components. Check for lot traceability documentation required for defense contracts. Validate that the lead finish meets the specified gold-tin standard.

Selection Notes

Select this component when military qualification and wide temperature operation are mandatory. Compare propagation delay specifications against system timing constraints. Evaluate power dissipation limits relative to the thermal environment. Consider the ceramic package durability for harsh physical conditions. Verify compatibility with existing 5 V logic families in the design.

Part Context

This part belongs to the 54LS series of logic integrated circuits, which are the military versions of the commercial 74LS family. The 54LS257 specifically functions as a quadruple 2-input multiplexer. It shares functional similarities with other 54LS devices but is distinguished by its rigorous manufacturing standards and packaging suitable for aerospace and defense applications.

Replacement Considerations

Consider the DM54LS257J/883C or DM54LS257ADMQB as potential equivalents. Verify pinout compatibility before substitution. Ensure the replacement maintains the same MIL-STD-883 screening level. Check for any differences in output drive strength or electrical characteristics.