Scan Test Devices With 18-Bit Universal Bus Transceivers
The ABTH18502A and ABTH182502A scan test devices with 18-bit universal Bus Transceivers are members of the Texas Instruments SCOPE testability integrated-circuit 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 18-bit universal Bus Transceivers that combine D-type Latches and D-type Flip-Flops to allow data flow in transparent, latched, or clocked modes. They CAN be used either as two 9-bit transceivers or one 18-bit transceiver. The test circuitry CAN be activated by the TAP to take snapshot samples of the data appearing at the device pins or to perform a self test on the boundary-test cells. Activating the TAP in the normal mode does not affect the functional operation of the SCOPE universal Bus Transceivers
Data flow in each direction is controlled by output-enable ( and ), latch-enable (LEAB and LEBA), and Clock (CLKAB and CLKBA) inputs. For A-to-B data flow, the device operates in the transparent mode when LEAB is high. When LEAB is low, the A-bus data is latched while CLKAB is held at a static low or high Logic level. Otherwise, if LEAB is low, A-bus data is stored on a low-to-high transition of CLKAB. When is low, the B outputs are active. When is high, the B outputs are in the high-impedance state. B-to-A data flow is similar to A-to-B data flow but uses the , LEBA, and CLKBA inputs.
In the test mode, the normal operation of the SCOPE universal 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 performs boundary-scan test operations according to the protocol described in IEEE Standard 1149.1-1990.
Four dedicated test pins observe and control the operation of the test circuitry: test data input (TDI), test data output (TDO), test mode select (TMS), and test Clock (TCK). Additionally, the test circuitry performs other testing functions such as parallel-signature analysis (PSA) on data inputs and pseudo-random pattern generation (PRPG) from data outputs. All testing and scan operations are synchronized to the TAP Interface
Improved scan efficiency is accomplished through the adoption of a one boundary-scan cell (BSC) per I/O pin architecture. This architecture is implemented in such a way as to capture the most pertinent test data. A PSA/COUNT instruction also is included to ease the testing of Memories and other circuits where a binary count addressing scheme is useful.
Active bus-hold circuitry holds unused or floating data inputs at a valid Logic level.
The B-port outputs of 'ABTH182502A, which are designed to source or sink up to 12 mA, include 25- series resistors to reduce overshoot and undershoot.
The SN54ABTH18502A and SN54ABTH182502A are characterized for operation over the full military temperature range of -55?C to 125?C. The SN74ABTH18502A and SN74ABTH182502A are characterized for operation from -40?C to 85?C.
A-to-B data flow is shown. B-to-A data flow is similar but uses OEBA, LEBA, and CLKBA.
Output level before the indicated steady-state input conditions were established
By Texas Instruments
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