Produktdetails

Supply voltage (min) (V) 2.7 Supply voltage (max) (V) 3.6 Number of channels 8 IOL (max) (mA) 32 IOH (max) (mA) -15 Input type TTL-Compatible CMOS Output type 3-State Features Balanced outputs, Partial power down (Ioff), Positive input clamp diode, Power up 3-state, Very high speed (tpd 5-10ns) Technology family LVT Rating Military Operating temperature range (°C) -40 to 85
Supply voltage (min) (V) 2.7 Supply voltage (max) (V) 3.6 Number of channels 8 IOL (max) (mA) 32 IOH (max) (mA) -15 Input type TTL-Compatible CMOS Output type 3-State Features Balanced outputs, Partial power down (Ioff), Positive input clamp diode, Power up 3-state, Very high speed (tpd 5-10ns) Technology family LVT Rating Military Operating temperature range (°C) -40 to 85
SOIC (DW) 24 159.65 mm² 15.5 x 10.3
  • Members of Texas Instruments Broad Family of Testability Products Supporting IEEE Std 1149.1-1990 (JTAG) Test Access Port (TAP) and Boundary-Scan Architecture
  • Provide Built-In Access to IEEE Std 1149.1 Scan-Accessible Test/Maintenance Facilities at Board and System Levels
  • While Powered at 3.3 V, the TAP Interface Is Fully 5-V Tolerant for Mastering Both 5-V and/or 3.3-V IEEE Std 1149.1 Targets
  • Simple Interface to Low-Cost 3.3-V Microprocessors/Microcontrollers Via 8-Bit Asynchronous Read/Write Data Bus
  • Easy Programming Via Scan-Level Command Set and Smart TAP Control
  • Transparently Generate Protocols to Support Multidrop TAP Configurations Using TI’s Addressable Scan Port
  • Flexible TCK Generator Provides Programmable Division, Gated-TCK, and Free-Running-TCK Modes
  • Discrete TAP Control Mode Supports Arbitrary TMS/TDI Sequences for Noncompliant Targets
  • Programmable 32-Bit Test Cycle Counter Allows Virtually Unlimited Scan/Test Length
  • Accommodate Target Retiming (Pipeline) Delays of up to 15 TCK Cycles
  • Test Output Enable (TOE)\ Allows for External Control of TAP Signals
  • High-Drive Outputs (–32-mA IOH, 64-mA IOL) at TAP Support Backplane Interface and/or High Fanout

  • Members of Texas Instruments Broad Family of Testability Products Supporting IEEE Std 1149.1-1990 (JTAG) Test Access Port (TAP) and Boundary-Scan Architecture
  • Provide Built-In Access to IEEE Std 1149.1 Scan-Accessible Test/Maintenance Facilities at Board and System Levels
  • While Powered at 3.3 V, the TAP Interface Is Fully 5-V Tolerant for Mastering Both 5-V and/or 3.3-V IEEE Std 1149.1 Targets
  • Simple Interface to Low-Cost 3.3-V Microprocessors/Microcontrollers Via 8-Bit Asynchronous Read/Write Data Bus
  • Easy Programming Via Scan-Level Command Set and Smart TAP Control
  • Transparently Generate Protocols to Support Multidrop TAP Configurations Using TI’s Addressable Scan Port
  • Flexible TCK Generator Provides Programmable Division, Gated-TCK, and Free-Running-TCK Modes
  • Discrete TAP Control Mode Supports Arbitrary TMS/TDI Sequences for Noncompliant Targets
  • Programmable 32-Bit Test Cycle Counter Allows Virtually Unlimited Scan/Test Length
  • Accommodate Target Retiming (Pipeline) Delays of up to 15 TCK Cycles
  • Test Output Enable (TOE)\ Allows for External Control of TAP Signals
  • High-Drive Outputs (–32-mA IOH, 64-mA IOL) at TAP Support Backplane Interface and/or High Fanout

The ’LVT8980A embedded test-bus controllers (eTBCs) are members of the TI broad family of testability integrated circuits. This family of devices supports IEEE Std 1149.1-1990 boundary scan to facilitate testing of complex circuit assemblies. Unlike most other devices of this family, the eTBCs are not boundary-scannable devices; rather, their function is to master an IEEE Std 1149.1 (JTAG) test access port (TAP) under the command of an embedded host microprocessor/microcontroller. Thus, the eTBCs enable the practical and effective use of the IEEE Std 1149.1 test-access infrastructure to support embedded/built-in test, emulation, and configuration/maintenance facilities at board and system levels.

The eTBCs master all TAP signals required to support one 4- or 5-wire IEEE Std 1149.1 serial test bus: test clock (TCK), test mode select (TMS), test data input (TDI), test data output (TDO), and test reset (TRST)\. All such signals can be connected directly to the associated target IEEE Std 1149.1 devices without need for additional logic or buffering. However, as well as being directly connected, the TMS, TDI, and TDO signals can be connected to distant target IEEE Std 1149.1 devices via a pipeline, with a retiming delay of up to 15 TCK cycles; the eTBCs automatically handle all associated serial-data justification.

Conceptually, the eTBCs operate as simple 8-bit memory- or I/O-mapped peripherals to a microprocessor/microcontroller (host). High-level commands and parallel data are passed to/from the eTBCs via their generic host interface, which includes an 8-bit data bus (D7–D0) and a 3-bit address bus (A2–A0). Read/write select (R/W\) and strobe (STRB)\ signals are implemented so that the critical host-interface timing is independent of the CLKIN period. An asynchronous ready (RDY) indicator is provided to hold off, or insert wait states into, a host read/write cycle when the eTBCs cannot respond immediately to the requested read/write operation.

High-level commands are issued by the host to cause the eTBCs to generate the TMS sequences necessary to move the test bus from any stable TAP-controller state to any other such stable state, to scan instruction or data through test registers in target devices, and/or to execute instructions in the Run-Test/Idle TAP state. A 32-bit counter can be programmed to allow a predetermined number of scan or execute cycles.

During scan operations, serial data that appears at the TDI input is transferred into a serial to 4 × 8-bit-parallel first-in/first-out (FIFO) read buffer, which can then be read by the host to obtain the return serial-data stream up to eight bits at a time. Serial data that is to be transmitted from the TDO output is written by the host, up to eight bits at a time, to a 4 × 8-bit-parallel to serial FIFO write buffer.

In addition to such simple state-movement, scan, and run-test operations, the eTBCs support several additional commands that provide for input-only scans, output-only scans, recirculate scans (in which TDI is mirrored back to TDO), and a scan mode that generates the protocols used to support multidrop TAP configurations using TI’s addressable scan port. Two loopback modes also are supported that allow the microprocessor/microcontroller host to monitor the TDO or TMS data streams output by the eTBCs.

The eTBCs’ flexible clocking architecture allows the user to choose between free-running (in which the TCK always follows CLKIN) and gated modes (in which the TCK output is held static except during state-move, run-test, or scan cycles) as well as to divide down TCK from CLKIN. A discrete mode also is available in which the TAP is driven strictly by read/write cycles under full control of the microprocessor/microcontroller host. These features ensure that virtually any IEEE Std 1149.1 target device or device chain can be serviced by the eTBCs, even where such may not fully comply to IEEE Std 1149.1

While most operations of the eTBCs are synchronous to CLKIN, a test-output enable (TOE)\ is provided for output control of the TAP outputs, and a reset (RST)\ input is provided for hardware reset of the eTBCs. The former can be used to disable the eTBCs so that an external controller can master the associated IEEE Std 1149.1 test bus.

The ’LVT8980A embedded test-bus controllers (eTBCs) are members of the TI broad family of testability integrated circuits. This family of devices supports IEEE Std 1149.1-1990 boundary scan to facilitate testing of complex circuit assemblies. Unlike most other devices of this family, the eTBCs are not boundary-scannable devices; rather, their function is to master an IEEE Std 1149.1 (JTAG) test access port (TAP) under the command of an embedded host microprocessor/microcontroller. Thus, the eTBCs enable the practical and effective use of the IEEE Std 1149.1 test-access infrastructure to support embedded/built-in test, emulation, and configuration/maintenance facilities at board and system levels.

The eTBCs master all TAP signals required to support one 4- or 5-wire IEEE Std 1149.1 serial test bus: test clock (TCK), test mode select (TMS), test data input (TDI), test data output (TDO), and test reset (TRST)\. All such signals can be connected directly to the associated target IEEE Std 1149.1 devices without need for additional logic or buffering. However, as well as being directly connected, the TMS, TDI, and TDO signals can be connected to distant target IEEE Std 1149.1 devices via a pipeline, with a retiming delay of up to 15 TCK cycles; the eTBCs automatically handle all associated serial-data justification.

Conceptually, the eTBCs operate as simple 8-bit memory- or I/O-mapped peripherals to a microprocessor/microcontroller (host). High-level commands and parallel data are passed to/from the eTBCs via their generic host interface, which includes an 8-bit data bus (D7–D0) and a 3-bit address bus (A2–A0). Read/write select (R/W\) and strobe (STRB)\ signals are implemented so that the critical host-interface timing is independent of the CLKIN period. An asynchronous ready (RDY) indicator is provided to hold off, or insert wait states into, a host read/write cycle when the eTBCs cannot respond immediately to the requested read/write operation.

High-level commands are issued by the host to cause the eTBCs to generate the TMS sequences necessary to move the test bus from any stable TAP-controller state to any other such stable state, to scan instruction or data through test registers in target devices, and/or to execute instructions in the Run-Test/Idle TAP state. A 32-bit counter can be programmed to allow a predetermined number of scan or execute cycles.

During scan operations, serial data that appears at the TDI input is transferred into a serial to 4 × 8-bit-parallel first-in/first-out (FIFO) read buffer, which can then be read by the host to obtain the return serial-data stream up to eight bits at a time. Serial data that is to be transmitted from the TDO output is written by the host, up to eight bits at a time, to a 4 × 8-bit-parallel to serial FIFO write buffer.

In addition to such simple state-movement, scan, and run-test operations, the eTBCs support several additional commands that provide for input-only scans, output-only scans, recirculate scans (in which TDI is mirrored back to TDO), and a scan mode that generates the protocols used to support multidrop TAP configurations using TI’s addressable scan port. Two loopback modes also are supported that allow the microprocessor/microcontroller host to monitor the TDO or TMS data streams output by the eTBCs.

The eTBCs’ flexible clocking architecture allows the user to choose between free-running (in which the TCK always follows CLKIN) and gated modes (in which the TCK output is held static except during state-move, run-test, or scan cycles) as well as to divide down TCK from CLKIN. A discrete mode also is available in which the TAP is driven strictly by read/write cycles under full control of the microprocessor/microcontroller host. These features ensure that virtually any IEEE Std 1149.1 target device or device chain can be serviced by the eTBCs, even where such may not fully comply to IEEE Std 1149.1

While most operations of the eTBCs are synchronous to CLKIN, a test-output enable (TOE)\ is provided for output control of the TAP outputs, and a reset (RST)\ input is provided for hardware reset of the eTBCs. The former can be used to disable the eTBCs so that an external controller can master the associated IEEE Std 1149.1 test bus.

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Typ Titel Datum
* Data sheet SN54LVT8980A, SN74LVT8980A datasheet (Rev. B) 18 Mär 2004
Application note Implications of Slow or Floating CMOS Inputs (Rev. E) 26 Jul 2021
Selection guide Logic Guide (Rev. AB) 12 Jun 2017
Application note Understanding and Interpreting Standard-Logic Data Sheets (Rev. C) 02 Dez 2015
User guide LOGIC Pocket Data Book (Rev. B) 16 Jan 2007
EVM User's guide LASP Demo Board User's Guide 01 Nov 2005
Application note Programming CPLDs Via the 'LVT8986 LASP 01 Nov 2005
Application note Semiconductor Packing Material Electrostatic Discharge (ESD) Protection 08 Jul 2004
Application note TI IBIS File Creation, Validation, and Distribution Processes 29 Aug 2002
Application note 16-Bit Widebus Logic Families in 56-Ball, 0.65-mm Pitch Very Thin Fine-Pitch BGA (Rev. B) 22 Mai 2002
Application note Power-Up 3-State (PU3S) Circuits in TI Standard Logic Devices 10 Mai 2002
Selection guide Advanced Bus Interface Logic Selection Guide 09 Jan 2001
Application note LVT-to-LVTH Conversion 08 Dez 1998
Application note LVT Family Characteristics (Rev. A) 01 Mär 1998
Application note Bus-Interface Devices With Output-Damping Resistors Or Reduced-Drive Outputs (Rev. A) 01 Aug 1997
Application note Input and Output Characteristics of Digital Integrated Circuits 01 Okt 1996
Application note Live Insertion 01 Okt 1996
Application note Understanding Advanced Bus-Interface Products Design Guide 01 Mai 1996

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