SN74LVC257D

Overview

The SN74LVC257D is a quadruple 2-line to 1-line data selector/multiplexer with 3-state outputs manufactured by Texas Instruments. It belongs to the SN74LVC257A logic family and operates on a single power supply ranging from 1.65 V to 3.6 V. The device features four independent multiplexing circuits, each selecting between two inputs based on address lines. It utilizes a 16-pin SOIC package for surface-mount installation. Key electrical characteristics include a maximum propagation delay of 6.4 ns at 3.3 V and output drive capabilities of 24 mA for both high and low states. The operational temperature range extends from -40°C to +85°C.

Feature Summary

• Provides four independent 2-to-1 data selection paths within a single integrated circuit
• Features 3-state outputs that prevent loading of data lines when disabled
• Supports input voltage levels up to 5.5 V while operating from lower supply voltages

Applications

• I/O expansion in embedded systems
• Motor driver control interfaces
• Server and network switch signal routing
• Telecommunications infrastructure equipment

Procurement Notes

Verify the specific suffix 'D' corresponds to the standard 16-SOIC package variant rather than tape-and-reel or other packaging options. Confirm RoHS compliance status and ensure the manufacturer part number matches the exact datasheet revision required for your design. Check for any lead-free manufacturing updates or environmental declarations relevant to your region's regulatory standards before finalizing procurement.

Selection Notes

Select this component when designing systems requiring multiple independent data paths with tri-state buffering. It is suitable for applications needing fast switching speeds under low-voltage operation. Ensure the system voltage remains within the 1.65 V to 3.6 V range. Consider thermal dissipation requirements if operating near maximum temperature limits. Verify that the 24 mA output current meets the load requirements of the connected circuitry.

Part Context

This device is part of the broader SN74LVC257A family, which includes variants with different packaging such as SSOP or tape-and-reel formats. It shares functional similarities with other LVC series multiplexers but offers specific performance metrics tailored for low-voltage digital logic applications. The SN74AS257D represents an older Advanced Schottky technology alternative with higher voltage tolerance but slower speed compared to this LVC version.

Replacement Considerations

SN74LVC257ADG4: Pin-compatible replacement with identical functionality and specifications.

FAQ

What is the maximum propagation delay for the SN74LVC257D?

The maximum propagation delay is 6.4 ns when operating at a supply voltage of 3.3 V.

Can the SN74LVC257D accept 5 V input signals?

Yes, the inputs are designed to accept voltage levels up to 5.5 V, allowing compatibility with 5 V logic sources even when powered by lower voltages.