SN74ACT8990FN

Specialty Logic Overview

The SN74ACT8990FN is a test-bus controller IC from Texas Instruments' SCOPETM family, designed as an IEEE Std 1149.1 (JTAG) TAP master. It features a 16-bit generic host interface for communication with external processors. The device operates within a voltage range of 4.5V to 5.5V and supports boundary scan logic functions. It is housed in a 44-pin PLCC package measuring 16.58x16.58 mm.

Specialty Logic Feature Summary

• Functions as a JTAG TAP master supporting IEEE Std 1149.1 standards
• Provides a 16-bit generic host interface for system integration
• Part of the SCOPETM testability integrated-circuit family

Specialty Logic Applications

• Boundary scan testing systems
• JTAG-based debug and programming interfaces
• Test bus control in electronic assemblies

Specialty Logic Procurement Notes

Verify the specific suffix 'FN' corresponds to the 44-PLCC package variant when sourcing. Confirm RoHS compliance status through official manufacturer documentation or authorized distributor specifications prior to procurement. Ensure the component matches the exact part number to avoid functional discrepancies with other variants in the ACT8990 series.

Specialty Logic Selection Notes

Select this component when a dedicated JTAG TAP master with a parallel host interface is required. It is suitable for designs needing direct processor connection via a 16-bit bus. Consider the PLCC package constraints for PCB layout. Verify that the operating voltage requirements align with the 4.5V to 5.5V specification.

Specialty Logic Part Context

This part belongs to the SN74ACT series of specialty function logic devices. It is specifically categorized under test-bus controllers and boundary scan JTAG logic. The device is manufactured by Texas Instruments and is distinct from standard logic gates or microcontrollers, focusing solely on testability and protocol management functions.

Specialty Logic Replacement Considerations

Check for compatible TAP masters within the same SCOPETM family. Verify pinout compatibility if substituting with other SN74ACT8990 variants. Ensure the replacement supports the same IEEE 1149.1 standard and 16-bit host interface requirements.