SN74LVC257APWR

Overview

The SN74LVC257APWR 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 (tpd) is 4.6ns at 3.3V. Typical output ground bounce (VOLP) is 2V at VCC = 3.3V and TA = 25°C. Latch-up performance exceeds 250mA per JESD 17. ESD protection exceeds 2000V human-body model and 200V machine model.

Feature Summary

• Operates from 1.65V to 3.6V supply voltage
• Inputs accept voltages up to 5.5V for level translation
• Maximum propagation delay of 4.6ns at 3.3V
• High ESD protection exceeding 2000V human-body model

Applications

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

Procurement Notes

Verify the specific package type and suffix against official documentation before procurement. Confirm operating temperature range requirements match the SN74LVC257A specifications. Ensure input signals do not exceed absolute maximum ratings. Check for RoHS compliance status if required by project standards. Validate pinout compatibility with existing PCB layouts.

Selection Notes

Select this component when designing bus-organized systems requiring signal multiplexing from 4-bit data sources. Consider its capability to translate between 3.3V and 5V logic levels. Evaluate the 3-state output feature for minimizing line loading. Assess the maximum propagation delay against system timing constraints. Verify power supply voltage availability within the 1.65V to 3.6V range.

Part Context

This part belongs to the SNx4LVC257A family of quadruple 2-line to 1-line data selectors and multiplexers. It utilizes CMOS technology designed for low-voltage operation. The device provides balanced output drive suitable for high-speed applications. It is intended for digital signal data selection and multiplexing functions in various electronic systems.

Replacement Considerations

SN74LVC257ADBR

FAQ

Can the SN74LVC257APWR be used for level translation?

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

What happens to the outputs when OE is high?

When the output-enable (OE) input is at a high logic level, the 3-state outputs enter a high-impedance state and do not load the data lines.