SN74ALS639AN

Buffers, Drivers, Receivers, Transceivers Overview

The SN74ALS639AN is an octal bus transceiver from the Texas Instruments ALS logic family, housed in a 20-pin PDIP package. It features bidirectional data transfer with A-bus outputs configured as open collector and B-bus outputs as push-pull. The device operates within a supply voltage range of 4.5 V to 5.5 V. It supports non-inverting logic functions and includes TTL-compatible inputs and outputs. The component is designed for surface mount or through-hole installation, functioning reliably within a temperature range of 0°C to +70°C.

Buffers, Drivers, Receivers, Transceivers Feature Summary

• Bidirectional octal bus transceiver architecture
• Mixed output drive capabilities with open collector and push-pull configurations
• TTL-compatible input and output interfaces

Buffers, Drivers, Receivers, Transceivers Applications

• Memory mapping control circuits
• Clock drivers and buffer applications
• Bidirectional bus architectures requiring mixed drive strengths

Buffers, Drivers, Receivers, Transceivers Procurement Notes

Verify the specific ordering suffix to confirm the package type and tape/reel specifications. Ensure the procurement channel provides official datasheets matching the SN74ALS639AN designation. Confirm RoHS compliance status directly with the manufacturer documentation before integration into regulated assemblies.

Buffers, Drivers, Receivers, Transceivers Selection Notes

Select this component when bidirectional data transfer requires distinct drive characteristics for source and sink loads. The open collector A-bus allows wired-OR connections, while the push-pull B-bus provides standard logic levels. Verify that the system voltage remains within the 4.5 V to 5.5 V operational window.

Buffers, Drivers, Receivers, Transceivers Part Context

This part belongs to the SN74ALS series, representing Advanced Low-power Schottky technology. It serves as a high-speed alternative to standard 74LS devices, offering improved speed-to-power product ratios. The octal configuration consolidates eight independent transceivers into a single package for dense board layouts.

Buffers, Drivers, Receivers, Transceivers Replacement Considerations

Direct pin-compatible substitutes include other octal bus transceivers from the same logic family, such as the SN74ALS245. Verify that the replacement maintains the required open collector and push-pull output mix if that specific electrical characteristic is critical to the design.