SN74ALS646ADW

Buffers, Drivers, Receivers, Transceivers Overview

The SN74ALS646ADW is an octal registered bus transceiver from the Texas Instruments ALS logic family. It features eight D-type flip-flops with three-state outputs, designed for high-speed data transfer and storage in bidirectional bus architectures. The device operates within a supply voltage range of 4.5 V to 5.5 V and supports TTL input and output levels. Packaged in a 24-pin SOIC (DW) format, it offers a propagation delay of 30 ns and provides a low-level output current of 24 mA alongside a high-level output current of -15 mA. It functions as a non-inverting transceiver suitable for industrial temperature ranges.

Buffers, Drivers, Receivers, Transceivers Feature Summary

• Integrates octal registered architecture combining bus transceiving capabilities with data storage via internal D-type flip-flops.
• Provides three-state outputs to facilitate efficient management of bidirectional data flow on system buses.
• Supports TTL-compatible input and output voltage levels for broad interoperability with standard logic families.

Buffers, Drivers, Receivers, Transceivers Applications

• Bidirectional data bus architectures requiring simultaneous signal transmission and temporary data storage.
• High-speed digital systems utilizing ALS logic series for improved performance over standard TTL.
• Industrial control environments operating within specified commercial temperature limits.

Buffers, Drivers, Receivers, Transceivers Procurement Notes

Verify the specific package variant, as the ADW suffix denotes a 24-pin SOIC tube packaging. Confirm that the required propagation delay and drive current specifications align with the target circuit design. Ensure compatibility with the 4.5 V to 5.5 V power supply range and check for any updated RoHS compliance documentation prior to final procurement decisions.

Buffers, Drivers, Receivers, Transceivers Selection Notes

Select this component when an application demands both bus driving capability and latched data storage within a single integrated circuit. The ALS series offers faster switching speeds compared to standard LS logic, making it appropriate for higher frequency operations. Consider the 24-pin SOIC footprint constraints and ensure thermal management meets the requirements for operation up to 70°C.

Buffers, Drivers, Receivers, Transceivers Part Context

This part belongs to the SN74ALS646A family of octal bus transceivers with registers. It serves as a specialized interface component bridging microprocessors and memory or peripheral devices. The ALS technology provides a balance between speed and power consumption, positioning it between older LS logic and newer advanced CMOS technologies in legacy and mixed-signal designs.

Buffers, Drivers, Receivers, Transceivers Replacement Considerations

Direct functional substitutes include other octal registered bus transceivers from the same manufacturer's ALS line, such as the SN74ALS646ADR for tape-and-reel packaging. Verify pinout compatibility and electrical characteristics before substituting with generic equivalents from other vendors.