SN74LVC257ADR

Overview

The SN74LVC257ADR 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. The device features inputs that accept voltages up to 5.5V, enabling use as a translator in mixed 3.3V or 5V systems. Maximum propagation delay is 4.6ns at 3.3V. It is housed in a 16-pin SOIC package.

Feature Summary

• Provides four independent 2-to-1 multiplexing channels with 3-state outputs for bus-organized systems.
• Accepts input signals up to 5.5V, allowing direct interfacing with 3.3V or 5V logic devices.
• Includes high electrostatic discharge protection exceeding 2000V via human-body model testing.

Applications

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

Procurement Notes

Verify the specific ordering suffix 'ADR' corresponds to the SOIC-16 package and large tape-and-reel carrier configuration. Confirm the operating temperature range matches the -40°C to +85°C specification for this variant. Ensure design compliance with the recommended pull-up resistor requirements on the OE pin during power-up sequences.

Selection Notes

Select this component when designing systems requiring low-voltage operation between 1.65V and 3.6V with high-speed signal routing capabilities. The 3-state output feature is essential for preventing bus contention in shared data line architectures. Verify that the maximum propagation delay of 4.6ns meets the timing constraints of the target application interface.

Part Context

This part belongs to the SNx4LVC257A family of quadruple multiplexers designed for CMOS technology. The LVC series supports wide supply voltage ranges and provides balanced output drive characteristics. The device integrates overvoltage-tolerant inputs to facilitate seamless integration into mixed-voltage digital environments without external level-shifting components.

Replacement Considerations

SN74LVC257AD

FAQ

How does the device handle mixed voltage environments?

The inputs are overvoltage tolerant and can accept voltages up to 5.5V, allowing them to be driven directly by 3.3V or 5V devices while the core operates at 1.65V to 3.6V.

What is the function of the OE pin?

The Output Enable (OE) pin controls the 3-state outputs. When OE is high, the outputs enter a high-impedance state; when low, the selected inputs are passed to the outputs.