SN74HC257DE4

Overview

The SN74HC257DE4 is a quad 2-line to 1-line data selector/multiplexer with 3-state outputs manufactured by Texas Instruments. It operates within a supply voltage range of 2 V to 6 V and supports an operating temperature range of -40°C to 85°C. The device features non-inverted outputs, typical propagation delays of 9 ns at 5 V, and low input current of 1 µA maximum. It is housed in a 16-pin SOIC package.

Feature Summary

• Provides four independent channels for selecting between two data sources using shared address inputs.
• Features 3-state outputs that prevent loading on data lines when the output-enable input is high.
• Capable of driving up to 15 LSTTL loads due to high-current inverting output design.

Applications

• Bus interface systems connecting multiple signal sources
• Data routing in high-performance digital systems
• Multiplexing signals from 4-bit data sources

Procurement Notes

Verify the specific ordering suffix 'E4' against the manufacturer's official documentation to confirm compliance details and material specifications. Ensure the selected package variant matches the required PCB footprint and thermal constraints for the intended application environment.

Selection Notes

Select this component for applications requiring wide voltage operation between 2 V and 6 V. Consider the HC logic family for its balance of speed and power consumption. Verify that the 16-pin SOIC package dimensions fit the available board space and that the 3-state output capability aligns with the bus architecture requirements.

Part Context

This part belongs to the SNx4HC257 series of quadruple 2-line to 1-line data selectors. It shares functional similarities with the SN74HC258, which provides inverted outputs instead of non-inverted ones. Both devices utilize the same pinout and control logic but differ in output polarity.

Replacement Considerations

SN74HC257DRG4: Active production version with identical electrical characteristics and SOIC-16 packaging.