SN74LS444DW

Overview

The SN74LS444DW is a quadruple tridirectional bus transceiver from Texas Instruments' LS logic series. It features eight data inputs and outputs, with independent direction control for each pair of ports. The device operates within a supply voltage range of 4.75 V to 5.25 V and utilizes a 20-pin SOIC package. It supports TTL input levels and provides three-state outputs for effective bus management in digital systems.

Feature Summary

• Provides four bidirectional data channels with independent direction control
• Features three-state outputs to facilitate efficient bus line sharing
• Compatible with standard TTL input logic voltage levels

Applications

• Bidirectional data bus buffering applications
• Two-way bus communication interfaces
• Memory-to-peripheral data transfer circuits

Procurement Notes

Verify the specific revision level and RoHS compliance status directly with the manufacturer or authorized distributors before procurement. Confirm that the SOIC-20 package dimensions match your PCB footprint requirements. Ensure the operating temperature range meets your system's environmental specifications.

Selection Notes

Select this component when designing systems requiring flexible bidirectional data flow between two buses. It is suitable for applications needing isolated control over data direction for individual channel pairs. Consider power consumption and propagation delay characteristics relative to other LS series alternatives.

Part Context

This part belongs to the SN74LS family of low-power Schottky logic devices. It serves as a fundamental building block for digital data routing. The DW suffix indicates a plastic small-outline package variant manufactured by Texas Instruments.

Replacement Considerations

Check for direct pin-compatible substitutes within the same logic family. Verify electrical parameters such as output drive current and switching speed against original design requirements before substitution.