SN74ALS990DW

Overview

The SN74ALS990DW is an octal D-type transparent read-back latch manufactured by Texas Instruments. It features eight non-inverting outputs and operates within a supply voltage range of 4.5 V to 5.5 V. The device exhibits a propagation delay of approximately 6 ns, enabling high-speed data processing. It functions in a commercial temperature range from 0°C to +70°C and is housed in a 20-pin DW (SOIC) package.

Feature Summary

• Provides transparent latching functionality for temporary data storage and transfer in digital circuits.
• Includes read-back capability to monitor input states directly.
• Features tri-state outputs for efficient bus interfacing.

Applications

• Temporary data storage in digital systems
• Data transfer operations requiring high speed
• Bus interface applications

Procurement Notes

Verify the specific ordering suffix to ensure the correct package type and tape/reel configuration match your assembly requirements. Confirm that the component meets all relevant RoHS directives for your target market. Check for any recent product change notifications regarding pinout or electrical characteristics before finalizing procurement plans.

Selection Notes

Select this component when an octal latch with read-back functionality is required. Ensure the system logic family is compatible with ALS standards. Verify that the 20-pin SOIC package fits the available board space and thermal constraints. Confirm that the operating voltage and temperature ranges align with the overall system design specifications.

Part Context

This part belongs to the SN74ALS990 series of octal D-type transparent read-back latches. It is designed for high-speed digital applications where data integrity and fast processing are critical. The device integrates eight independent latches into a single package, simplifying circuit design for wide data buses.

Replacement Considerations

Check for direct pin-to-pin replacements within the same ALS logic family. Verify compatibility with existing PCB footprints and signal levels. Ensure that any substitute part maintains the same read-back feature and tri-state output capabilities.