SN74ALS621ADWR

Buffers, Drivers, Receivers, Transceivers Overview

The SN74ALS621ADWR 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. Recommended operating conditions specify a low-level output current of 24 mA and a maximum propagation delay of 33 ns.

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
• Dual-enable configuration allows for local bus-latch functionality

Buffers, Drivers, Receivers, Transceivers Applications

• Asynchronous data bus transceivers
• Local bus-latch applications
• Wired-OR bus line drivers

Buffers, Drivers, Receivers, Transceivers Procurement Notes

Verify that the specific ordering suffix matches the required package type and lead finish. Confirm the revision level aligns with design specifications. Ensure the component meets RoHS compliance requirements for the target assembly process. Check for any specific environmental or reliability certifications mandated by the application standards.

Buffers, Drivers, Receivers, Transceivers Selection Notes

Select this component when open-collector outputs are required for bus sharing or wired-OR logic. The ALS series offers a balance of speed and power consumption compared to standard TTL. Verify that the system voltage falls within the 4.5 V to 5.5 V range. Consider the 33 ns propagation delay for timing constraints in the data path.

Buffers, Drivers, Receivers, Transceivers Part Context

This part belongs to the SN74ALS62xA series of octal bus transceivers. It shares functional similarities with the SN74ALS620A (inverting) and SN74ALS623A (3-state), differing primarily in output structure. The DW suffix indicates a plastic small-outline package variant.

Buffers, Drivers, Receivers, Transceivers Replacement Considerations

SN74ALS621ADW is a direct pin-compatible alternative in tube packaging.