SN74ALS642A-1NSR

Buffers, Drivers, Receivers, Transceivers Overview

The SN74ALS642A-1NSR is an octal bus transceiver in the ALS logic series, housed in a 20-pin SOP (SOIC) package. It provides bidirectional data transmission between two buses with inverting logic functionality. The device features three-state outputs and includes direction control (DIR) and output enable (OE) inputs for managing data flow and isolation. Designed for operation within a supply voltage range of 4.5 V to 5.5 V, it supports an operating temperature range from 0°C to 70°C. The -1 suffix indicates an increased recommended maximum low-level output current capability compared to standard versions.

Buffers, Drivers, Receivers, Transceivers Feature Summary

• Octal bus transceiver architecture supporting asynchronous two-way communication between data buses
• Inverting logic function allowing data transfer from A to B or B to A based on direction control input
• Three-state outputs with dedicated output-enable input for effective bus isolation
• -1 version variant featuring increased low-level output current capacity

Buffers, Drivers, Receivers, Transceivers Applications

• Asynchronous two-way communication between data buses
• Bidirectional data transmission systems requiring bus isolation
• Digital circuit designs utilizing inverting logic functions

Buffers, Drivers, Receivers, Transceivers Procurement Notes

Verify that the specific ordering suffix matches the required package type and tape-and-reel specifications. Confirm the -1 designation aligns with application requirements for increased low-level output current. Ensure compatibility with the specified 4.5 V to 5.5 V supply voltage range and industrial temperature limits before procurement.

Buffers, Drivers, Receivers, Transceivers Selection Notes

Select this component when inverting logic is required for octal bus applications. The -1 version is suitable for designs needing higher low-level sink current capabilities. Consider the SOP package dimensions and thermal characteristics for PCB layout. Verify that the three-state output behavior meets system isolation requirements during inactive periods.

Buffers, Drivers, Receivers, Transceivers Part Context

This device belongs to the Texas Instruments SN74ALS642A family of octal bus transceivers. It shares functional similarities with the non-inverting SN74ALS641A but differs in logic polarity. The product line utilizes Advanced Low-Power Schottky technology to balance speed and power consumption. The -1 variant specifically addresses high-current drive needs within the same logical framework.

Buffers, Drivers, Receivers, Transceivers Replacement Considerations

SN74ALS642A-1N is available as a PDIP alternative. SN74ALS642A-1DW offers a SOIC option with tube packaging. SN74ALS641A-1NSR serves as a non-inverting equivalent if logic polarity differences are acceptable.