SN74ALS642A-1DWRE4

Buffers, Drivers, Receivers, Transceivers Overview

The SN74ALS642A-1DWRE4 is an octal bus transceiver from the Texas Instruments 74ALS series, housed in a 20-pin SOIC package. It provides bidirectional data transmission between two buses (A and B) controlled by a DIR input, with isolation enabled via an OE input. The device features inverting logic and operates within a supply voltage range of 4.5 V to 5.5 V. It supports low-level output currents up to 48 mA under specific conditions and functions reliably across an operating temperature range of 0°C to 70°C.

Buffers, Drivers, Receivers, Transceivers Feature Summary

• Bidirectional octal bus transceiver architecture for asynchronous communication
• Inverting logic configuration for signal inversion during transfer
• Direction control and output enable inputs for flexible bus management

Buffers, Drivers, Receivers, Transceivers Applications

• Asynchronous two-way communication between data buses
• Bus-oriented memory and command decoders
• High-density digital systems requiring bidirectional data flow

Buffers, Drivers, Receivers, Transceivers Procurement Notes

Verify that the ordering suffix 'E4' corresponds to lead-free packaging and RoHS compliance as per Texas Instruments standards. Confirm the -1 designation indicates the increased low-level output current capability of 48 mA. Ensure the DW package type matches the required surface-mount footprint and pin spacing for the target PCB layout.

Buffers, Drivers, Receivers, Transceivers Selection Notes

Select this component when inverting logic is required for bidirectional data transfer. The -1 version offers higher drive strength compared to standard variants. Consider the 74ALS series characteristics for speed and power consumption balance. Verify compatibility with system voltage levels and thermal requirements before integration into the design.

Buffers, Drivers, Receivers, Transceivers Part Context

This part belongs to the SN74ALS64x family of octal bus transceivers. It shares functional similarities with the non-inverting SN74ALS641A but differs in logic polarity. The device is designed for high-density applications using 20-pin packages. It complements other logic families by providing robust bidirectional buffering capabilities.

Buffers, Drivers, Receivers, Transceivers Replacement Considerations

SN74ALS642A-1DWR is a tape-and-reel variant of the same device. SN74ALS642A-1DW is the tube-packaged equivalent. SN74ALS641A serves as a non-inverting alternative within the same series.