SN74BCT8240ADW

Specialty Logic Overview

The SN74BCT8240ADW is an octal inverting buffer and line driver integrated into the SCOPE testability family. It supports IEEE Standard 1149.1-1990 boundary-scan architecture for complex circuit-board assembly testing. The device features a four-wire Test Access Port (TAP) interface with dedicated terminals for test data input, output, mode select, and clock. In normal operation, it functions equivalently to standard octal buffers while maintaining low power consumption through BiCMOS technology.

Specialty Logic Feature Summary

• Supports IEEE Standard 1149.1-1990 boundary-scan architecture for board-level testing
• Integrates a four-wire Test Access Port (TAP) controller for synchronous test operations
• Provides parallel-signature analysis and pseudo-random pattern generation capabilities
• Maintains functional equivalence to standard octal buffers during normal-mode operation

Specialty Logic Applications

• Boundary-scan testing of complex printed circuit board assemblies
• Self-test operations on boundary-test cells within digital systems
• Parallel-signature analysis of data inputs at device terminals
• Pseudo-random pattern generation from device outputs for diagnostic purposes

Specialty Logic Procurement Notes

Verify that the specific ordering suffix corresponds to the plastic small-outline package variant required for your design. Confirm that the component meets the commercial operating temperature range specifications. Ensure compatibility with the target system's voltage levels and signal integrity requirements before finalizing procurement decisions.

Specialty Logic Selection Notes

Select this component when board-level testability is a primary design requirement alongside standard buffering functionality. It is suitable for applications requiring simultaneous normal logic operation and JTAG-compliant test access. Consider the package constraints and thermal characteristics relative to the intended mounting environment.

Specialty Logic Part Context

This device belongs to Texas Instruments' SCOPE family of testability products, designed to facilitate manufacturing test of complex electronic assemblies. It integrates standard octal buffer logic with specialized scan-test circuitry controlled via the TAP interface. The family supports various instructions defined by the IEEE 1149.1 standard for comprehensive system diagnostics.

Specialty Logic Replacement Considerations

SN54BCT8240AJT

Specialty Logic FAQ

How does the device handle test operations without affecting normal logic?

Activating the TAP in normal mode allows snapshot sampling of terminal data without inhibiting the functional operation of the octal buffers.

What is the function of the Boundary-Control Register?

The two-bit register specifies additional test operations such as parallel-signature analysis or pseudo-random pattern generation during boundary-run tests.