SN74ABT8652DWRG4

Specialty Logic Overview

The SN74ABT8652DWRG4 is a scan test device featuring octal bus transceivers and registers, designed for IEEE Standard 1149.1-1990 boundary-scan testing. It utilizes EPIC-IIB BiCMOS technology to reduce power dissipation while maintaining functional equivalence to standard ABT652 devices in normal operation. The component operates within a supply voltage range of 4.5 V to 5.5 V and supports an operating temperature range from -40°C to +85°C. It is housed in a 38-pin Plastic Small-Outline (DW) package.

Specialty Logic Feature Summary

• Integrates IEEE Standard 1149.1-1990 compliant Test Access Port (TAP) interface for boundary-scan architecture support.
• Provides dual-mode functionality with normal bus management operations and dedicated test circuitry activation via TAP.
• Includes specialized test registers such as boundary-scan, bypass, and boundary-control registers for comprehensive board-level diagnostics.

Specialty Logic Applications

• Testing complex circuit-board assemblies using boundary-scan methodology.
• Parallel-signature analysis at inputs with masking options.
• Pseudo-random pattern generation from outputs for self-test verification.

Specialty Logic Procurement Notes

Verify the specific suffix 'G4' indicates compliance with RoHS directives and confirms the Plastic Small-Outline (DW) package variant. Ensure the design accommodates the 4-wire TAP interface signals (TDI, TDO, TMS, TCK). Confirm that the application environment remains within the specified commercial temperature limits of -40°C to +85°C.

Specialty Logic Selection Notes

Select this component when board-level testing requirements mandate IEEE 1149.1 compliance alongside high-speed octal data transfer capabilities. It serves as a direct functional replacement for non-scan ABT652 devices where testability features are required. Consider the DW package dimensions for PCB layout constraints and ensure the system design supports the necessary TAP controller logic.

Specialty Logic Part Context

This device belongs to the Texas Instruments SCOPE family of testability products, which integrates scan test structures directly into standard logic functions. The SN74ABT8652 series specifically targets applications requiring robust boundary-scan capabilities without sacrificing the performance of octal bus transceivers. It represents a solution for manufacturing test efficiency in mixed-signal or digital systems.

Specialty Logic Replacement Considerations

Functionally equivalent to the SN74ABT652 in normal mode. The SN54ABT8652 offers military temperature range compatibility (-55°C to 125°C). Verify pinout compatibility if substituting with other octal bus transceiver variants lacking scan features.

Specialty Logic FAQ

How does the device handle normal operation during test mode activation?

Activating the TAP in normal mode does not affect the functional operation of the SCOPE octal bus transceivers and registers until the test mode is explicitly enabled via the instruction register.

What is the purpose of the Boundary-Control Register (BCR)?

The BCR implements additional test operations not included in the basic instruction set, such as pseudo-random pattern generation, parallel-signature analysis with masking, and binary count up.