DM54LS158E/883

Overview

The DM54LS158E/883 is a military-grade data selector and multiplexer from the National Semiconductor LS Series. It features four independent 2-to-1 multiplexing circuits with inverted outputs, implemented in TTL technology. The device utilizes a 20-pin Ceramic Quad Flat Pack (CQCC20) package, also designated as LCCC, suitable for high-reliability applications. It operates at a nominal supply voltage of 5 V and is qualified to MIL-STD-883 standards.

Feature Summary

• Provides four independent 2-to-1 data selection channels within a single integrated circuit
• Features inverted output logic compatible with standard TTL interfaces
• Constructed using LS series TTL technology for defined switching performance
• Housed in a hermetic ceramic quad flat pack package for environmental resilience

Applications

• Military avionics signal routing systems
• Spacecraft telemetry data selection
• High-reliability industrial control multiplexing
• Defense communication equipment interface management

Procurement Notes

Verify that the component carries the correct /883 suffix indicating compliance with MIL-STD-883 testing requirements. Confirm the package type is CQCC20 or LCCC and check for proper screening levels such as Class B or C. Ensure documentation confirms the manufacturer as National Semiconductor or authorized successor entities to guarantee authenticity and traceability for critical deployments.

Selection Notes

Select this component when four independent 2-to-1 multiplexing functions are required in a harsh environment. It is appropriate for designs necessitating hermetic sealing and radiation tolerance associated with ceramic packages. Consider this part over plastic equivalents if long-term stability and military qualification are mandatory constraints for the system architecture.

Part Context

This device belongs to the 54LS family of logic components produced by National Semiconductor. The 54 series denotes military temperature range and reliability specifications, distinguishing it from commercial 74 series parts. The LS designation indicates Low-power Schottky technology, offering a balance of speed and power consumption suitable for complex digital logic systems requiring robust performance.

Replacement Considerations

Direct replacements must match the 54LS logic family and CQCC20 package. Verify equivalent parts from Texas Instruments or other authorized manufacturers that maintain MIL-STD-883 qualification. Ensure pin compatibility and identical logical function before substitution.