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SN74ABTH18652A的基本参数
  • 制造厂商:TI
  • 产品类别:逻辑和电压转换
  • 技术类目:缓冲器、驱动器和收发器 - 通用收发器
  • 功能描述:具有 18 位收发器和寄存器的扫描测试设备
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SN74ABTH18652A的产品详情:

The 'ABTH18652A and 'ABTH182652A scan test devices with 18-bit bus transceivers and registers 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 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 SCOPETM bus transceivers and registers.

Data flow in each direction is controlled by clock (CLKAB and CLKBA), select (SAB and SBA), and output-enable (OEAB and ) inputs. For A-to-B data flow, 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). When OEAB is high, the B outputs are active. When OEAB is low, the B outputs are in the high-impedance state. Control for B-to-A data flow is similar to that for A-to-B data flow, but uses CLKBA, SBA, and inputs. Since the input is active-low, the A outputs are active when is low and are in the high-impedance state when is high. Figure 1 illustrates the four fundamental bus-management functions that are performed with the 'ABTH18652A and 'ABTH182652A.

 

In the test mode, the normal operation of the SCOPETM bus transceivers and registers 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 is also 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 'ABTH182652A, which are designed to source or sink up to 12 mA, include 25- series resistors to reduce overshoot and undershoot.

The SN54ABTH18652A and SN54ABTH182652A are characterized for operation over the full military temperature range of -55°C to 125°C. The SN74ABTH18652A and SN74ABTH182652A are characterized for operation from -40°C to 85°C.

 

 

 

SN74ABTH18652A的优势和特性:
  • 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
  • Include D-Type Flip-Flops and Control Circuitry to Provide Multiplexed Transmission of Stored and Real-Time Data
  • Bus Hold on Data Inputs Eliminates the Need for External Pullup Resistors
  • B-Port Outputs of 'ABTH182652A Devices Have Equivalent 25- Series Resistors, So No External Resistors Are Required
  • State-of-the-Art EPIC-IIBTM BiCMOS Design
  • One Boundary-Scan Cell Per I/O Architecture Improves Scan Efficiency
  • SCOPETM Instruction Set
    • IEEE Standard 1149.1-1990 Required Instructions and Optional 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
  • Packaged in 64-Pin Plastic Thin Quad Flat (PM) Packages Using 0.5-mm Center-to-Center Spacings and 68-Pin Ceramic Quad Flat (HV) Packages Using 25-mil Center-to-Center Spacings

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

SN74ABTH18652A的参数(英文):
  • IOL (Max) (mA)
  • 64
  • IOH (Max) (mA)
  • -15
  • Technology Family
  • ABT
  • Rating
  • Catalog
  • Operating temperature range (C)
  • -40 to 85
SN74ABTH18652A具体的完整产品型号参数及价格(美元):

SN74ABTH18652A的完整型号有:SN74ABTH18652APM,以下是这些产品的关键参数及官网采购报价:

SN74ABTH18652APM,工作温度:-40 to 85,封装:LQFP (PM)-64,包装数量MPQ:160个,MSL 等级/回流焊峰值温度:Level-3-260C-168 HR,引脚镀层/焊球材料:NIPDAU,TI官网SN74ABTH18652APM的批量USD价格:8.541(1000+)

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SN74ABTH18652A的评估套件:

SN74ABTH18652APM,工作温度:-40 to 85,封装:LQFP (PM)-64,包装数量MPQ:160个,MSL 等级/回流焊峰值温度:Level-3-260C-168 HR,引脚镀层/焊球材料:NIPDAU,TI官网SN74ABTH18652APM的批量USD价格:8.541(1000+)

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