SN74HC257PW

Overview

The SN74HC257PW is a quadruple 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, high-current drive capability for up to 15 LSTTL loads, and low power consumption with a maximum ICC of 80 µA. Typical propagation delay is 9 ns at 5 V.

Feature Summary

• Provides four independent 2-to-1 data selectors controlled by shared address select inputs.
• Features 3-state outputs that enter a high-impedance state when the active-low strobe input is high.
• Designed for bus interface applications in high-performance systems.

Applications

• Bus interface from multiple sources
• Data selection
• Multiplexing

Procurement Notes

Verify the specific package type (TSSOP) and manufacturer origin against the datasheet specifications. Confirm RoHS compliance status and check the current production status, as the standard SN74HC257PW may be obsolete while tape-and-reel variants like PWR remain active.

Selection Notes

Select this component for designs requiring quad 2-to-1 multiplexing with tri-state output control. Ensure the system voltage falls between 2 V and 6 V. Consider the SN74HC258 if inverted outputs are required instead of the non-inverted outputs provided here.

Part Context

This part belongs to the SNx4HC257 family of quadruple 2-line to 1-line data selectors. It is distinct from the SN74HC258, which provides inverted outputs. The PW suffix indicates a TSSOP-16 package, distinguishing it from SOIC or PDIP variants.

Replacement Considerations

SN74HC257PWR

FAQ

How does the strobe input affect the outputs?

A high level at the G terminal forces all outputs into the high-impedance state.

What is the difference between SN74HC257 and SN74HC258?

The SN74HC257 has non-inverted outputs, whereas the SN74HC258 has inverted outputs.