SN74BCT8240ADWR

Specialty Logic Overview

The SN74BCT8240ADWR is a scan test device featuring octal inverting buffers, belonging to the Texas Instruments SCOPE family. It supports IEEE Standard 1149.1-1990 boundary-scan architecture for testing complex circuit-board assemblies. The device operates with a supply voltage range of 4.5 V to 5.5 V and functions within an operating temperature range of 0°C to 70°C. It utilizes a 24-pin SOIC (DW) package.

Specialty Logic Feature Summary

• Supports IEEE Standard 1149.1-1990 boundary-scan architecture via a 4-wire Test Access Port interface.
• Functionally equivalent to 'F240 and 'BCT240 octal buffers in normal operation mode.
• Enables parallel-signature analysis on inputs and pseudo-random pattern generation from outputs.
• Includes dedicated test terminals for synchronous control of internal test circuitry.

Specialty Logic Applications

• Facilitating testing of complex circuit-board assemblies through boundary-scan techniques.
• Performing self-tests on boundary-test cells and observing I/O boundaries.
• Implementing optional test reset signals by recognizing double-high-level voltage on TMS pin.

Specialty Logic Procurement Notes

Verify that the component matches the SN74BCT8240A series specifications, specifically the 4.5 V to 5.5 V supply voltage range and 0°C to 70°C operating temperature. Confirm the package type is SOIC-24 (DW) and ensure compliance with IEEE Standard 1149.1-1990 requirements for boundary-scan integration.

Specialty Logic Selection Notes

Select this device when boundary-scan testability is required for systems using BCT logic families. It serves as a direct functional replacement for standard 'F240 or 'BCT240 buffers while adding comprehensive test access capabilities. Ensure the design accommodates the specific TAP controller state machine and register structures defined in the datasheet.

Specialty Logic Part Context

This component is part of the Texas Instruments SCOPE family of testability products. It integrates standard octal buffer functionality with specialized test registers, including an instruction register, boundary-scan register, and bypass register. This combination allows for seamless transition between normal data driving and diagnostic test modes without altering the physical footprint of standard buffer applications.

Specialty Logic Replacement Considerations

The device is functionally equivalent to the 'F240 and 'BCT240 in normal mode. For replacements requiring identical boundary-scan features, verify compatibility with the specific SCOPE instruction set and TAP controller implementation described in the datasheet.