SN74LVC257AD

Overview

The SN74LVC257AD 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, allowing compatibility with 3.3V or 5V devices in mixed-voltage systems. At 3.3V, the maximum propagation delay is 4.6ns. It includes ESD protection exceeding 2000V (human-body model) and latch-up performance exceeding 250mA per JESD 17.

Feature Summary

• Provides four independent 2-to-1 multiplexing channels with 3-state outputs for bus-organized systems.
• Accepts input voltages up to 5.5V, enabling use as a translator in mixed 3.3V and 5V environments.
• Features low output ground bounce and high-speed operation suitable for demanding digital applications.

Applications

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

Procurement Notes

Verify the specific package type and ordering suffix against the manufacturer's current documentation before procurement. Confirm that the component meets all required environmental standards and operating temperature ranges for the intended application. Ensure proper handling precautions are observed due to electrostatic discharge sensitivity.

Selection Notes

Select this component when designing systems requiring low-voltage operation between 1.65V and 3.6V with high-speed signal routing capabilities. It is suitable for applications needing interface translation between different logic voltage levels without external components. Consider the thermal characteristics and layout requirements for optimal performance in dense circuit designs.

Part Context

This part belongs to the SNx4LVC257A family of quadruple 2-line to 1-line data selectors and multiplexers. The 'SN74' prefix indicates commercial grade availability, while 'LVC' denotes Low-Voltage CMOS technology. The 'AD' suffix specifies the SOIC-16 package variant. This series is designed for efficient signal multiplexing in modern electronic systems.

Replacement Considerations

SN74LVC257ADR

FAQ

Can the SN74LVC257AD be used to translate signals between 3.3V and 5V logic?

Yes, the inputs can be driven from either 3.3V or 5V devices, allowing the device to function as a translator in mixed voltage system environments.

What is the recommended method to ensure the high-impedance state during power up or power down?

To ensure the high-impedance state during power up or power down, the OE (Output Enable) input must be tied to VCC through a pullup resistor.