SN74ALS621ADWRE4

Buffers, Drivers, Receivers, Transceivers Overview

The SN74ALS621ADWRE4 is an octal bus transceiver from the Texas Instruments ALS logic family, housed in a 20-pin SOIC package. It features open-collector true outputs and operates within a supply voltage range of 4.5 V to 5.5 V. The device supports asynchronous two-way communication between data buses with dual-enable inputs for flexible timing control. It is characterized for operation from 0°C to 70°C.

Buffers, Drivers, Receivers, Transceivers Feature Summary

• Provides asynchronous two-way communication capability between data buses
• Features open-collector true outputs suitable for wired-OR configurations
• Includes dual-enable configuration allowing local bus-latch functionality

Buffers, Drivers, Receivers, Transceivers Applications

• Asynchronous data bus transceivers
• Local bus-latch applications
• Memory and memory-style architectures

Buffers, Drivers, Receivers, Transceivers Procurement Notes

Verify that the RE4 suffix indicates tape-and-reel packaging rather than tube packaging when sourcing components. Confirm RoHS compliance status as specified in the manufacturer's documentation. Ensure the ordering part number matches the required package style and environmental specifications for your assembly process.

Buffers, Drivers, Receivers, Transceivers Selection Notes

Select this component when open-collector outputs are required for bus sharing or wired-logic applications. The dual-enable feature allows simultaneous bidirectional data transfer, which is useful for specific latch configurations. Consider the ALS speed and power characteristics relative to standard TTL requirements.

Buffers, Drivers, Receivers, Transceivers Part Context

This device belongs to the SN74ALS621A series of octal bus transceivers. It shares functional similarities with the SN74ALS620A (inverting) and SN74ALS623A (three-state), differing primarily in output type and polarity. The ALS family offers higher speed and lower power consumption compared to standard 74LS devices.

Buffers, Drivers, Receivers, Transceivers Replacement Considerations

SN74ALS621ADWR is a direct pin-compatible alternative available in tape-and-reel packaging.