SN74ALS621ADW

Buffers, Drivers, Receivers, Transceivers Overview

The SN74ALS621ADW is an octal bus transceiver from the Texas Instruments ALS logic family, housed in a 20-pin Small-Outline (DW) package. It provides asynchronous two-way communication between data buses with open collector true outputs. The device operates on a supply voltage ranging from 4.5 V to 5.5 V and supports a low-level output current of 24 mA. Propagation delay ranges from 10 ns to 33 ns depending on direction and load conditions. It functions within an operating temperature range of 0°C to 70°C.

Buffers, Drivers, Receivers, Transceivers Feature Summary

• Dual-output-enable configuration allows flexible timing control for data transmission between A and B buses.
• Local bus-latch capability enables data storage by simultaneously enabling both OEAB and OEBA inputs.
• Open-collector true outputs reinforce input signals when isolation is disabled.

Buffers, Drivers, Receivers, Transceivers Applications

• Asynchronous two-way communication between data buses
• Bus-oriented memory and signal buffering
• Local bus-latch applications

Buffers, Drivers, Receivers, Transceivers Procurement Notes

Verify the specific ordering suffix 'DW' confirms the plastic small-outline package type. Confirm RoHS compliance status and lead finish details via the manufacturer's latest packaging addendum. Ensure the component matches the standard version specifications rather than the -1 variant which has different current ratings.

Buffers, Drivers, Receivers, Transceivers Selection Notes

Select this component for designs requiring octal bidirectional data transfer with open-collector outputs. Verify that the system voltage remains within the 4.5 V to 5.5 V range. Consider the propagation delay limits when designing high-speed bus interfaces. Ensure the application does not require the higher drive current available in the -1 version.

Buffers, Drivers, Receivers, Transceivers Part Context

This device belongs to the SN74ALS621A series of octal bus transceivers. It is part of the broader 74ALS logic family designed for high-speed applications. The DW package designation indicates a surface-mount SOIC form factor suitable for automated assembly processes.

Buffers, Drivers, Receivers, Transceivers Replacement Considerations

The SN74ALS621A-1DW is a compatible alternative offering increased recommended maximum low-level output current. Verify pinout compatibility and electrical characteristics before substitution.