SN74ALS645A-1DW

Buffers, Drivers, Receivers, Transceivers Overview

The SN74ALS645A-1DW is an octal bus transceiver with 3-state outputs in a 20-pin Small-Outline (DW) package. It facilitates asynchronous two-way communication between data buses, transmitting data from the A bus to the B bus or vice versa based on the DIR input level. The OE input isolates the buses when disabled. This -1 version features an increased recommended maximum IOL of 48 mA, applicable only if VCC is between 4.75 V and 5.25 V. Operating temperature range is 0°C to 70°C.

Buffers, Drivers, Receivers, Transceivers Feature Summary

• Bidirectional data transmission between A and B buses controlled by DIR input
• Three-state outputs allowing effective bus isolation via OE input
• -1 version supports increased low-level output current under specific voltage conditions

Buffers, Drivers, Receivers, Transceivers Applications

• Asynchronous two-way communication between data buses
• Bus-oriented memory and logic systems
• High-density digital circuit designs requiring bidirectional control

Buffers, Drivers, Receivers, Transceivers Procurement Notes

Verify the exact ordering suffix against the Package Option Addendum, as the -1DW variant is listed as obsolete while other suffixes like -1DWR remain active. Confirm RoHS compliance status and lead finish details directly with Texas Instruments for this specific discontinued part number before procurement planning.

Buffers, Drivers, Receivers, Transceivers Selection Notes

Select this component for applications requiring high-density octal bus interfacing with TTL-compatible inputs. Ensure the design accommodates the specific -1 version electrical characteristics, particularly the IOL rating constraints relative to supply voltage. Verify that the SOIC-20 package dimensions align with the target PCB layout requirements.

Buffers, Drivers, Receivers, Transceivers Part Context

This device belongs to the SN74ALS645A family of octal bus transceivers. It shares functional similarities with standard versions but distinguishes itself through enhanced low-level output current capabilities in the -1 variant. The DW package option provides a surface-mount solution within the broader ALS logic series portfolio.

Buffers, Drivers, Receivers, Transceivers Replacement Considerations

SN74ALS645A-1DWR is listed as an active production alternative with identical functionality and marking.