SN74LVC257APWRG4

Overview

The SN74LVC257APWRG4 is a quadruple 2-line to 1-line data selector and multiplexer with 3-state outputs. It operates from 1.65V to 3.6V VCC, features inputs accepting voltages up to 5.5V, and has a maximum propagation delay of 4.6ns at 3.3V. The device is housed in a 16-pin TSSOP package.

Feature Summary

• Provides four independent 2-to-1 multiplexing channels with high-speed switching capabilities.
• Features 3-state outputs that prevent loading on data lines when the output-enable input is inactive.
• Supports mixed voltage environments by allowing inputs driven from 3.3V or 5V devices.

Applications

• Cable Modem Termination Systems
• I/O Expanders
• Network Switches

Procurement Notes

Verify the specific ordering suffix 'G4' against the manufacturer's current documentation to confirm compliance with environmental standards such as RoHS. Ensure the selected package type matches the intended PCB footprint requirements for the 16-pin TSSOP configuration.

Selection Notes

Select this component for bus-organized systems requiring signal multiplexing between 4-bit data sources and output lines. Consider its low-voltage operation range and high input tolerance when designing interfaces between different logic families.

Part Context

This part belongs to the SNx4LVC257A series of quadruple 2-line to 1-line data selectors. It utilizes CMOS technology to provide balanced output drive and is designed for applications requiring efficient signal routing in digital systems.

Replacement Considerations

SN74LVC257ADBR

FAQ

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

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

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

The A/B pin selects the input channel; a low logic level selects input A, while a high logic level selects input B.