SN74AS640DWG4

Buffers, Drivers, Receivers, Transceivers Overview

The SN74AS640DWG4 is an octal bus transceiver with 3-state outputs manufactured by Texas Instruments. It operates within a supply voltage range of 4.5 V to 5.5 V and supports bidirectional data transmission between two buses based on the DIR input level. The device features inverting logic and includes an output-enable (OE) input for isolating buses. It is housed in a 20-pin Small-Outline (DW) package and is characterized for operation over a temperature range of 0°C to 70°C.

Buffers, Drivers, Receivers, Transceivers Feature Summary

• Bidirectional data transfer capability between A and B buses controlled by direction signals
• Inverting logic design for asynchronous communication applications
• Output isolation functionality via dedicated enable control input

Buffers, Drivers, Receivers, Transceivers Applications

• Asynchronous two-way communication between data buses
• Bus-oriented memory and register implementations
• High-density circuit designs requiring bidirectional data flow

Buffers, Drivers, Receivers, Transceivers Procurement Notes

Verify that the ordering suffix G4 confirms compliance with RoHS standards as indicated by manufacturer documentation. Confirm the DW package designation matches the required physical footprint. Ensure the component corresponds to the catalog version intended for commercial temperature ranges rather than military specifications.

Buffers, Drivers, Receivers, Transceivers Selection Notes

Select this component when high-speed bidirectional data transfer is required for 8-bit wide buses. The AS series offers faster switching characteristics compared to standard or ALS variants. Verify that the operating environment remains within the specified commercial temperature limits and that the power supply voltage stays within the recommended 4.5 V to 5.5 V range.

Buffers, Drivers, Receivers, Transceivers Part Context

This part belongs to the SN54/74AS640 family of octal bus transceivers. It shares functional similarities with the SN74ALS640B but provides improved speed performance typical of the AS logic family. The device is designed for general-purpose digital systems requiring efficient bus management and signal direction control.

Buffers, Drivers, Receivers, Transceivers Replacement Considerations

SN74AS640N serves as a pin-compatible alternative in a PDIP package.