SN74ALS641ANS

Buffers, Drivers, Receivers, Transceivers Overview

The SN74ALS641ANS is an octal bus transceiver from the Texas Instruments ALS series, housed in a 20-pin SOP package. It provides asynchronous two-way communication between data buses with true (non-inverting) logic outputs. The device features bidirectional data transfer controlled by a DIR input and isolation capability via an OE input. It operates within a supply voltage range of 4.5 V to 5.5 V and supports an operating temperature range of 0°C to 70°C.

Buffers, Drivers, Receivers, Transceivers Feature Summary

• Bidirectional data transmission between A and B buses
• Direction control via dedicated DIR input pin
• Bus isolation through output-enable (OE) functionality
• True logic output polarity for non-inverting operation

Buffers, Drivers, Receivers, Transceivers Applications

• Asynchronous two-way communication between data buses
• I/O port expansion in microprocessor systems
• Memory interface buffering and driving

Buffers, Drivers, Receivers, Transceivers Procurement Notes

Verify the specific ordering suffix 'ANS' against current TI documentation to confirm package type and availability status. Confirm RoHS compliance and lead finish details as these may vary across production runs. Ensure the design accommodates the specified SOP-20 footprint and thermal requirements for the commercial temperature range.

Buffers, Drivers, Receivers, Transceivers Selection Notes

Select this component when true logic polarity is required for bus interfacing. The -1 version designation indicates increased low-level output current capability compared to standard variants. Verify that the system load capacitance does not exceed the maximum rated value to maintain signal integrity and switching speed specifications.

Buffers, Drivers, Receivers, Transceivers Part Context

This device belongs to the SN74ALS641A family of octal bus transceivers. It is functionally similar to the SN74ALS642A but differs in output polarity, offering true rather than inverting logic. The part is designed for high-density applications requiring efficient bus management and direction control in digital systems.

Buffers, Drivers, Receivers, Transceivers Replacement Considerations

SN74ALS641ADWR is a recommended active replacement for obsolete SOIC versions. SN74ALS641AN serves as a direct PDIP equivalent. SN74ALS641A-1DWR and SN74ALS641A-1NSR are active alternatives with enhanced drive characteristics.