SN74ABT18245A - 具有 18 位总线收发器的扫描测试设备

SN74ABT18245A是TI德州仪器公司的一款边界扫描(JTAG)逻辑产品，SN74ABT18245A是具有 18 位总线收发器的扫描测试设备，本站介绍了SN74ABT18245A的封装应用图解、特点和优点、功能等，并给出了与SN74ABT18245A相关的TI元器件型号供参考。

SN74ABT18245A - 具有 18 位总线收发器的扫描测试设备 - 边界扫描(JTAG)逻辑 - 特殊逻辑 - 德州仪器

产品描述

The 'ABT18245A scan test devices with 18-bit bus transceivers are members of the Texas Instruments SCOPETM 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 noninverting bus transceivers. 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 SCOPETM bus transceivers.

Data flow is controlled by the direction-control (DIR) and output-enable (OE\) inputs. Data transmission is allowed from the A bus to the B bus or from the B bus to the A bus, depending on the logic level at DIR. OE\ can be used to disable the device so that the buses are effectively isolated.

In the test mode, the normal operation of the SCOPETM bus transceivers is inhibited and the test circuitry is enabled to observe and control the input/output (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.

The SN54ABT18245A is characterized for operation over the full military temperature range of -55°C to 125°C. The SN74ABT18245A is characterized for operation from -40°C to 85°C.

产品特性

Members of the Texas Instruments SCOPETM Family of Testability Products
Members of the Texas Instruments WidebusTM Family
Compatible With the IEEE Standard 1149.1-1990 (JTAG) Test Access Port and Boundary-Scan Architecture
SCOPETM Instruction Set
- IEEE Standard 1149.1-1990 Required Instructions, CLAMP and HIGHZ
- Parallel-Signature Analysis at Inputs
- Pseudo-Random Pattern Generation From Outputs
- Sample Inputs/Toggle Outputs
- Binary Count From Outputs
- Device Identification
- Even-Parity Opcodes
State-of-the-Art EPIC-II BTM BiCMOS Design Significantly Reduces Power Dissipation
Packaged in Plastic Shrink Small-Outline (DL) and Thin Shrink Small-Outline (DGG) Packages and 380-mil Fine-Pitch Ceramic Flat (WD) Packages

SCOPE, Widebus, and EPIC-IIB are trademarks of Texas Instruments Incorporated.

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