SN74LVC257APWT

Overview

The SN74LVC257APWT is a quadruple 2-line to 1-line data selector and multiplexer with 3-state outputs, manufactured by Texas Instruments. It operates from a supply voltage of 1.65V to 3.6V and features inputs that accept voltages up to 5.5V. The device provides a maximum propagation delay of 4.6ns at 3.3V. It utilizes TSSOP-16 packaging.

Feature Summary

• Provides four independent channels for selecting between two input lines per channel.
• Features 3-state outputs that prevent loading on data lines when output-enable is high.
• Supports mixed-voltage environments by accepting 5V inputs while operating at lower supply voltages.

Applications

• Cable Modem Termination Systems
• Tests and Measurements
• I/O Expanders
• Motor Drivers
• Network Switches

Procurement Notes

Verify the specific package suffix 'T' indicates the Tape and Reel carrier format containing 250 units. Confirm the RoHS compliance status and lead finish details against the latest manufacturer documentation before finalizing procurement specifications.

Selection Notes

Select this component for bus-organized systems requiring signal multiplexing from 4-bit sources. Ensure the design accommodates the 1.65V to 3.6V supply range and considers the 5.5V input tolerance for interfacing with higher voltage logic levels.

Part Context

This part belongs to the SNx4LVC257A family of quadruple 2-to-1 multiplexers. It is designed for low-voltage CMOS applications, offering balanced output drive and high-speed performance suitable for digital signal selection in various electronic systems.

Replacement Considerations

SN74LVC257ADBR

FAQ

How does the device handle power-up or power-down states?

To ensure the high-impedance state during power transitions, the OE pin must be tied to VCC through a pullup resistor.

What is the function of the A/B select pin?

The A/B pin selects which input pair (A or B) is routed to the corresponding Y output; a low logic level selects A, and a high logic level selects B.