54ACT257WRQMLV

Overview

The 54ACT257WRQMLV is a quad 2-input multiplexer from the ACT series, manufactured by National Semiconductor. It features four independent data selectors, each providing a true output with TRI-STATE capability. The device operates on a 3.3V or 5V supply and utilizes CMOS technology. It is housed in a 16-pin Ceramic Flat Pack (CDFP) package, designed for military temperature ranges (-55°C to 125°C). Propagation delay is typically 11 ns at nominal supply.

Feature Summary

• Quad configuration of 2-to-1 data selectors
• TRI-STATE outputs for bus driving applications
• Military-grade ceramic packaging for harsh environments
• ACT series performance with CMOS input compatibility

Applications

• Military avionics signal routing
• High-reliability data selection systems
• Bus isolation in defense electronics
• Cryogenic or high-temperature logic switching

Procurement Notes

Verify the specific suffix WRQMLV indicates radiation hardening or qualified military status. Confirm CDFP16 package authenticity. Ensure datasheet matches National Semiconductor/TI official documentation. Check RoHS compliance status as military parts may be exempt. Validate supplier authorization for QML-level components.

Selection Notes

Select this part for applications requiring quad multiplexing with TRI-STATE control in extreme temperatures. Compare propagation delays against system timing requirements. Ensure voltage levels match 3.3V or 5V operation. Consider package size constraints for CDFP16 footprint. Verify compatibility with existing logic families.

Part Context

Part of the National Semiconductor ACT series, known for speed comparable to LS TTL but with CMOS power consumption. The 54ACT257 specifically provides quad 2-input multiplexing. The WRQMLV designation suggests a specialized military or aerospace variant with enhanced reliability standards compared to commercial equivalents.

Replacement Considerations

Check for direct cross-reference from Texas Instruments or authorized distributors. Verify pinout compatibility with standard 54ACT257 devices. Ensure environmental ratings meet mission requirements. Confirm availability of equivalent radiation-hardened alternatives if needed.