SCAN TEST DEVICES WITH 18-BIT TRANSCEIVERS AND REGISTERS

The ABTH18646A and ABTH182646A scan test devices with 18-bit Bus Transceivers and Registers 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 Bus Transceivers and Registers that allow for multiplexed transmission of data directly from the input bus or from the internal Registers 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 Bus Transceivers and Registers Transceiver function is controlled by output-enable (OE) and direction (DIR) inputs. When OE is low, the transceiver is active and operates in the A-to-B direction when DIR is high or in the B-to-A direction when DIR is low. When OE is high, both the A and B outputs are in the high-impedance state, effectively isolating both buses. Data flow is controlled by Clock (CLKAB and CLKBA) and select (SAB and SBA) inputs. Data on the A bus is clocked into the associated Registers on the low-to-high transition of CLKAB. When SAB is low, real-time A data is selected for presentation to the B bus (transparent mode). When SAB is high, stored A data is selected for presentation to the B bus (registered mode). The function of the CLKBA and SBA inputs mirrors that of CLKAB and SAB, respectively. Figure 1 shows the four fundamental bus-management functions that are performed with the ABTH18646A and ABTH182646A. By Texas Instruments
SN54ABTH182646A 's PackagesSN54ABTH182646A 's pdf datasheet
SN54ABTH18646A




SN54ABTH182646A Pinout, Pinouts
SN54ABTH182646A pinout,Pin out
This is one package pinout of SN54ABTH182646A,If you need more pinouts please download SN54ABTH182646A's pdf datasheet.

SN54ABTH182646A circuits will be updated soon..., now you can download the pdf datasheet to check the circuits!

Related Electronics Part Number

Related Keywords:

SN54ABTH182646A Pb-Free SN54ABTH182646A Cross Reference SN54ABTH182646A Schematic SN54ABTH182646A Distributor
SN54ABTH182646A Application Notes SN54ABTH182646A RoHS SN54ABTH182646A Circuits SN54ABTH182646A footprint
Hot categories