SN74ALS642A-1DW

Buffers, Drivers, Receivers, Transceivers Overview

The SN74ALS642A-1DW is an octal bus transceiver in a high-density 20-pin SOIC 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 direction-control (DIR) input level. The device features open-collector outputs and operates within a supply voltage range of 4.5 V to 5.5 V. It provides isolation when the output-enable (OE) input is disabled. The -1 version supports a recommended maximum low-level output current of 48 mA under specific voltage conditions.

Buffers, Drivers, Receivers, Transceivers Feature Summary

• Bidirectional data transmission between two independent buses controlled by a single direction signal
• Open-collector output configuration suitable for wired-OR applications
• Hardware isolation capability via the output-enable control input

Buffers, Drivers, Receivers, Transceivers Applications

• Asynchronous communication interfaces between data buses
• Bus-oriented memory and control circuits
• Post-to-post buffering for bidirectional data transfer

Buffers, Drivers, Receivers, Transceivers Procurement Notes

Verify the active status and RoHS compliance directly with Texas Instruments before procurement. Confirm that the specific ordering suffix matches the required packaging format. Ensure the design accommodates the open-collector nature of the outputs, which requires external pull-up components for proper logic high levels.

Buffers, Drivers, Receivers, Transceivers Selection Notes

Select this component when an inverting octal transceiver with open-collector outputs is required. The -1 designation indicates enhanced drive capability compared to standard versions. Consider the SOIC package dimensions and thermal characteristics for the target application environment.

Buffers, Drivers, Receivers, Transceivers Part Context

This device belongs to the SN74ALS series of logic integrated circuits. It is functionally related to the non-inverting SN74ALS641A but provides inverted logic output. Both devices share similar pinouts and operational principles within the ALS family architecture.

Buffers, Drivers, Receivers, Transceivers Replacement Considerations

SN74ALS642A-1DWR is a tape-and-reel alternative offering identical electrical performance and functionality in the same package type.