SN74ALS641A-1NSR

Buffers, Drivers, Receivers, Transceivers Overview

The SN74ALS641A-1NSR is an octal bus transceiver from the Texas Instruments ALS logic family, housed in a 20-pin SOIC package. It operates within a supply voltage range of 4.5 V to 5.5 V and supports a maximum low-level output current of 48 mA with a high-level output current of -15 mA. The device features open-collector outputs and provides direction control for bidirectional data transfer. It functions as a single-channel, 8-bit transceiver with TTL input and output levels, designed for surface-mount installation.

Buffers, Drivers, Receivers, Transceivers Feature Summary

• Provides bidirectional data transmission via eight independent channels with direction control capability.
• Features open-collector outputs suitable for wired-OR configurations and bus line driving.
• Compatible with TTL input and output voltage levels for standard digital interface integration.

Buffers, Drivers, Receivers, Transceivers Applications

• Bidirectional bus-oriented memory and I/O mapping
• Driving bus lines and implementing bus protocols
• Interface circuits between different logic families

Buffers, Drivers, Receivers, Transceivers Procurement Notes

Verify the specific suffix 'NSR' against the manufacturer's official documentation to confirm the tape-and-reel packaging configuration and ensure it matches the required handling specifications. Confirm that the open-collector output type aligns with the circuit design requirements, as this differs from standard push-pull outputs. Cross-reference the exact part number to distinguish between variants with differing electrical characteristics or pinouts.

Buffers, Drivers, Receivers, Transceivers Selection Notes

Select this component when an octal transceiver with open-collector outputs is required for bidirectional bus applications. Ensure the system design accommodates the necessary pull-up resistors associated with open-collector logic. Verify that the 4.5 V to 5.5 V operating voltage range matches the target power supply and that the 20-pin SOIC package fits the available PCB footprint constraints.

Buffers, Drivers, Receivers, Transceivers Part Context

This device belongs to the SN74ALS641 series of octal bus transceivers. It serves as a key component in systems requiring efficient data routing between microprocessors and peripheral devices. The ALS technology offers improved speed and power consumption compared to earlier standards, making it suitable for moderate-speed digital designs requiring robust bus interfacing capabilities.

Buffers, Drivers, Receivers, Transceivers Replacement Considerations

Publicly confirmed substitute part numbers include SN74ALS641A-1DWR and SN74ALS641ADWR. These alternatives share the same functional logic and pinout but may differ in packaging style or reel specifications. Verify compatibility before substitution.