SN74LS642-1DW

Buffers, Drivers, Receivers, Transceivers Overview

The SN74LS642-1DW is an octal bus transceiver from the Texas Instruments SN74LS series, housed in a 20-pin SOIC package. It features open-collector outputs and operates within a supply voltage range of 4.75 V to 5.25 V. The device supports bidirectional data transfer with a common direction control input. It includes a single polarity control pin that determines whether the data path is non-inverting or inverting. Designed for low-power Schottky logic, it provides high noise immunity and fast switching speeds suitable for general-purpose digital applications.

Buffers, Drivers, Receivers, Transceivers Feature Summary

• Octal bus transceiver architecture providing eight independent bidirectional data channels
• Open-collector output configuration allowing wired-OR connections and flexible load driving
• Common direction control input manages signal flow between port A and port B
• Single polarity control input enables selection between non-inverting and inverting modes

Buffers, Drivers, Receivers, Transceivers Applications

• Bidirectional data bus drivers for microprocessor systems
• Memory module address and data line buffering
• I/O port expansion circuits requiring open-drain capabilities
• General-purpose digital logic level translation interfaces

Buffers, Drivers, Receivers, Transceivers Procurement Notes

Verify the specific ordering suffix '-1' confirms the inclusion of the polarity control feature, as standard variants may lack this function. Confirm the 'DW' designation corresponds to the 20-pin SOIC package type required for your PCB layout. Ensure the component meets RoHS compliance standards if applicable to your manufacturing process. Cross-reference the manufacturer's current status to confirm availability before finalizing procurement plans.

Buffers, Drivers, Receivers, Transceivers Selection Notes

Select this component when an octal transceiver with open-collector outputs is required for bus interfacing. The inclusion of polarity control allows for flexible logic inversion without additional external gates. Consider the 20-pin SOIC package dimensions for surface-mount assembly constraints. Evaluate the low-power Schottky characteristics against system power budgets and speed requirements compared to standard TTL alternatives.

Buffers, Drivers, Receivers, Transceivers Part Context

This part belongs to the SN74LS64x family of octal bus transceivers manufactured by Texas Instruments. The LS designation indicates Low-power Schottky technology, which offers improved speed and lower power consumption compared to standard 74-series logic. The family includes variants with 3-state outputs (SN74LS640, SN74LS645) and open-collector outputs (SN74LS641, SN74LS642). This specific model integrates both direction and polarity controls for versatile bus management.

Buffers, Drivers, Receivers, Transceivers Replacement Considerations

SN74LS642DW serves as a direct functional equivalent without the polarity control suffix.