SN74LVC257ADG4

Overview

The SN74LVC257ADG4 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 compatibility with 3.3V or 5V logic systems. At 3.3V, the maximum propagation delay is 4.6ns. It provides ESD protection exceeding 2000V via the human-body model and latch-up performance exceeding 250mA per JESD 17. The component is housed in a 16-pin SOIC package.

Feature Summary

• Provides four independent 2-to-1 multiplexing channels with high-speed signal selection capabilities.
• Features 3-state outputs that isolate data lines when the output-enable input is at a high logic level.
• Supports mixed-voltage system environments by accepting 5V inputs while operating on lower supply voltages.

Applications

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

Procurement Notes

Verify the specific ordering suffix 'DG4' against the manufacturer's current documentation to confirm the exact package variant and environmental compliance status. Ensure the procurement channel sources components directly from authorized distributors to guarantee authenticity and traceability. Confirm that the received parts match the specified 16-pin SOIC form factor required for the target PCB layout.

Selection Notes

Select this component for designs requiring low-voltage operation between 1.65V and 3.6V with high-speed multiplexing needs. The 5.5V tolerant inputs make it suitable for interfacing with legacy 5V logic without additional level shifting circuitry. Consider the 16-pin SOIC package dimensions during the mechanical design phase to ensure adequate board space and thermal management.

Part Context

This device belongs to the SNx4LVC257A family of quadruple 2-line to 1-line data selectors. These devices are designed for bus-organized systems where signals from 4-bit data sources must be multiplexed to 4-output data lines. The LVC series utilizes CMOS technology to provide balanced output drive and low power consumption compared to older logic families.

Replacement Considerations

Public confirmed substitute part numbers include SN74LVC257ADR and SN74LVC257APWR.

FAQ

How does the device handle mixed voltage environments?

The inputs can be driven from either 3.3V or 5V devices, allowing the use of these devices as translators in a mixed 3.3V and 5V system environment.

What is the purpose of the OE input?

The active-low Output Enable (OE) input controls the 3-state outputs. When OE is at a high logic level, the outputs do not load the data lines.