SN74HC257DT

Overview

The SN74HC257DT is a high-speed CMOS quad 2-line to 1-line data selector/multiplexer with three-state non-inverting outputs. It operates within a supply voltage range of 2 V to 6 V and features low power consumption with a maximum ICC of 80 µA. The device provides an active-low strobe (G) input that forces all outputs into a high-impedance state, facilitating bus interface applications. Key electrical characteristics include a typical propagation delay of 9 ns at 5 V and output drive capabilities of up to 15 LSTTL loads.

Feature Summary

• Contains four identical multiplexers controlled by common address select inputs
• Provides three-state outputs for efficient bus system interfacing
• Features low input current and high noise immunity

Applications

• Bus-oriented systems requiring signal routing from multiple sources
• Data selection and multiplexing in digital logic circuits
• High-performance systems utilizing shared data lines

Procurement Notes

Verify the specific ordering suffix 'DT' against the manufacturer's official Package Option Addendum. The datasheet indicates this specific suffix may be obsolete or require direct inquiry. Confirm availability status and ensure the selected package variant matches the required thermal and mechanical specifications for the target application.

Selection Notes

Select this component when a quad 2-to-1 multiplexer with non-inverting outputs and three-state control is required. Ensure the operating voltage falls between 2 V and 6 V. Consider the HC series for general-purpose applications where standard speed and low power are prioritized over the higher performance of AC or ACT families.

Part Context

This device belongs to the Texas Instruments SNx4HC257 family, which includes complementary inverted output variants like the SN74HC258. The HC series represents high-speed CMOS technology compatible with Low-power Schottky TTL (LSTTL) logic levels. The DT designation typically refers to the SOIC surface-mount package configuration.

Replacement Considerations

SN74HC257DR: Active production version of the same device in the SOIC package.