SN74LS257BNSR

Overview

The SN74LS257BNSR is a quad 2-input data selector/multiplexer manufactured by Texas Instruments. It belongs to the 74LS logic family and features three-state outputs for bus-oriented applications. The device provides four independent multiplexers, each selecting between two inputs based on address lines. It operates with a standard 5V supply voltage typical of LS-TTL logic. The component is designed for high-speed digital signal routing in complex circuitry.

Feature Summary

• Quad configuration providing four independent 2-to-1 multiplexing channels
• Three-state output capability enabling direct bus interfacing
• LS-TTL logic family compatibility for standard digital systems

Applications

• Data routing in microprocessor-based systems
• Bus-oriented transmission line driving
• Digital signal selection in instrumentation

Procurement Notes

Verify the specific suffix 'BNSR' against official Texas Instruments documentation to confirm package type and tape-and-reel specifications. Ensure the order matches the exact manufacturer part number to avoid receiving variants with different electrical characteristics or packaging formats. Cross-reference with current datasheets for any obsolescence notices.

Selection Notes

Select this component when designing circuits requiring multiple independent 2-to-1 signal paths with bus-compatible outputs. The LS series offers a balance of speed and power consumption suitable for general-purpose TTL applications. Consider alternative families if lower power or higher speed is required compared to standard LS performance levels.

Part Context

This device is part of the broader 74xx257 series of multiplexers. It shares functional similarities with other quad 2-input selectors but differs in drive strength and speed due to its specific LS-TTL technology. It serves as a foundational building block for digital data path management in legacy and industrial control designs.