54S253FM

Overview

The National Semiconductor 54S253FM is a dual 4-input multiplexer featuring TRI-STATE outputs, designed for TTL logic applications. It integrates two independent 4-to-1 data selectors within a single 16-pin Ceramic Flat Pack (CFP) package. The device allows the selection of one of four data inputs for each function based on address lines, providing high-speed signal routing capabilities suitable for digital systems requiring reliable data management and isolation.

Feature Summary

• Dual independent 4-to-1 data selector functionality
• TRI-STATE output capability for bus isolation
• TTL-compatible logic levels
• Robust ceramic flat pack construction

Applications

• Digital data routing systems
• Address decoding circuits
• Signal switching networks
• Multiplexed input processing

Procurement Notes

Verify the specific suffix 'FM' indicates the ceramic flat pack package variant when sourcing. Confirm manufacturer lineage as National Semiconductor was acquired by Texas Instruments; ensure documentation aligns with the original NS specifications. Check for military or extended temperature grades if required for your application environment.

Selection Notes

Select this component when dual independent multiplexing with TRI-STATE outputs is required in a TTL environment. The CFP package offers superior thermal and mechanical stability compared to plastic variants. Ensure voltage levels match standard TTL requirements and that the pinout compatibility fits the existing PCB layout constraints.

Part Context

This part belongs to the 54-series TTL logic family, known for high reliability and performance. The 54S253 specifically denotes the Schottky-clamped version, offering faster switching speeds than standard 54-series counterparts. It serves as a critical component in complex digital architectures requiring efficient data path management.

Replacement Considerations

Direct substitutes include the 54LS253 for lower power consumption, though speed characteristics will differ. Verify pin compatibility and electrical parameters before swapping. Other compatible parts may exist from different manufacturers adhering to the same JEDEC standards.