Members of the Texas Instruments

SCOPE ? Family of Testability Products

Octal Test-Integrated Circuits

Functionally Equivalent to ’F245 and

BCT245 in the Normal- Function Mode

Compatible With the IEEE Standard

1149.1-1990 (JTAG) Test Access Port and

Boundary-Scan Architecture

Test Operation Synchronous to Test

Access Port (TAP)

Implement Optional Test Reset Signal by

Recognizing a Double-High-Level Voltage

(10 V) on TMS Pin

SCOPE ? Instruction Set

? IEEE Standard 1149.1-1990 Required

Instructions, Optional INTEST, CLAMP,

and HIGHZ

? Parallel-Signature Analysis at Inputs

? Pseudo-Random Pattern Generation

From Outputs

? Sample Inputs/Toggle Outputs

Package Options Include Plastic

Small-Outline (DW) Packages, Ceramic

Chip Carriers (FK), and Standard Plastic

and Ceramic 300-mil DIPs (JT, NT)

description

The ’BCT8245A scan test devices with octal bus

transceivers are members of the Texas

Instruments SCOPE? testability integratedcircuit

family. This family of devices supports IEEE

Standard 1149.1-1990 boundary scan to facilitate

testing of complex circuit-board assemblies. Scan

access to the test circuitry is accomplished via the

4-wire test access port (TAP) interface.

In the normal mode, these devices are functionally equivalent to the ’F245 and ’BCT245 octal bus transceivers.

The test circuitry can be activated by the TAP to take snapshot samples of the data appearing at the device

terminals or to perform a self test on the boundary-test cells. Activating the TAP in normal mode does not affect

the functional operation of the SCOPE? octal bus transceivers.

In the test mode, the normal operation of the SCOPE? octal bus transceivers is inhibited and the test circuitry

is enabled to observe and control the I/O boundary of the device. When enabled, the test circuitry can perform

boundary-scan test operations as described in IEEE Standard 1149.1-1990.