SN74AS638AN

Buffers, Drivers, Receivers, Transceivers Overview

The SN74AS638AN is an octal bus transceiver from the Texas Instruments AS logic family, housed in a 20-pin PDIP package. It features three-state outputs and operates within a supply voltage range of 4.5 V to 5.5 V. The device provides a propagation delay of 15 ns and supports TTL input and output levels. It delivers a low-level output current of 24 mA and a high-level output current of -12 mA. Designed for through-hole mounting, it functions as an inverting bus transceiver with eight independent channels.

Buffers, Drivers, Receivers, Transceivers Feature Summary

• Octal configuration providing eight independent bidirectional data paths
• Three-state outputs allowing direct connection to system buses
• High-speed performance with 15 ns propagation delay characteristic of the AS series

Buffers, Drivers, Receivers, Transceivers Applications

• Memory module data bus interfacing
• Microprocessor-based system data routing
• Control signal distribution in industrial automation

Buffers, Drivers, Receivers, Transceivers Procurement Notes

Verify the specific suffix 'AN' corresponds to the PDIP-20 package and standard operating temperature range. Confirm RoHS compliance status for the specific manufacturing batch. Ensure the design accommodates the 4.5 V to 5.5 V supply requirement and TTL level compatibility. Check for obsolescence notices or lifecycle changes directly from the manufacturer before finalizing procurement plans.

Buffers, Drivers, Receivers, Transceivers Selection Notes

Select this component when high-speed octal bus transfer is required with TTL-compatible interfaces. The AS series offers faster switching speeds compared to ALS variants. Verify that the 24 mA sink current capability meets the load requirements of the connected circuitry. Ensure the 20-pin PDIP footprint fits the target PCB layout constraints.

Buffers, Drivers, Receivers, Transceivers Part Context

This part belongs to the SN74AS638A family of octal bus transceivers. It shares functional similarities with the SN74ALS638 but utilizes Advanced Schottky technology for improved speed. The device is designed for efficient data transfer between registers and buses in complex digital systems requiring high throughput.

Buffers, Drivers, Receivers, Transceivers Replacement Considerations

The SN74ALS638AN is a compatible alternative within the same product family, offering similar functionality with slightly slower propagation characteristics. Verify pinout compatibility and electrical parameter alignment before substitution.