SN74LVT18512

ACTIVE

Product details

Supply voltage (min) (V) 2.7 Supply voltage (max) (V) 3.6 Number of channels 18 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, Very high speed (tpd 5-10ns) Technology family LVT Rating Catalog Operating temperature range (°C) -40 to 85
Supply voltage (min) (V) 2.7 Supply voltage (max) (V) 3.6 Number of channels 18 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, Very high speed (tpd 5-10ns) Technology family LVT Rating Catalog Operating temperature range (°C) -40 to 85
TSSOP (DGG) 64 137.7 mm² 17 x 8.1
  • Members of the Texas Instruments SCOPETM Family of Testability Products
  • Members of the Texas Instruments WidebusTM Family
  • State-of-the-Art 3.3-V ABT Design Supports Mixed-Mode Signal Operation (5-V Input and Output Voltages With 3.3-V VCC)
  • Support Unregulated Battery Operation Down to 2.7 V
  • UBTTM (Universal Bus Transceiver) Combines D-Type Latches and D-Type Flip-Flops for Operation in Transparent, Latched, or Clocked Mode
  • B-Port Outputs of 'LVT182512 Devices Have Equivalent 25- Series Resistors, So No External Resistors Are Required
  • Compatible With the IEEE Std 1149.1-1990 (JTAG) Test Access Port and Boundary-Scan Architecture
  • SCOPETM Instruction Set
    • IEEE Std 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
  • Package Options Include 64-Pin Plastic Thin Shrink Small Outline (DGG) and 64-Pin Ceramic Dual Flat (HKC) Packages Using 0.5-mm Center-to-Center Spacings

SCOPE, Widebus, and UBT are trademarks of Texas Instruments Incorporated.

  • Members of the Texas Instruments SCOPETM Family of Testability Products
  • Members of the Texas Instruments WidebusTM Family
  • State-of-the-Art 3.3-V ABT Design Supports Mixed-Mode Signal Operation (5-V Input and Output Voltages With 3.3-V VCC)
  • Support Unregulated Battery Operation Down to 2.7 V
  • UBTTM (Universal Bus Transceiver) Combines D-Type Latches and D-Type Flip-Flops for Operation in Transparent, Latched, or Clocked Mode
  • B-Port Outputs of 'LVT182512 Devices Have Equivalent 25- Series Resistors, So No External Resistors Are Required
  • Compatible With the IEEE Std 1149.1-1990 (JTAG) Test Access Port and Boundary-Scan Architecture
  • SCOPETM Instruction Set
    • IEEE Std 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
  • Package Options Include 64-Pin Plastic Thin Shrink Small Outline (DGG) and 64-Pin Ceramic Dual Flat (HKC) Packages Using 0.5-mm Center-to-Center Spacings

SCOPE, Widebus, and UBT are trademarks of Texas Instruments Incorporated.

The 'LVT18512 and 'LVT182512 scan test devices with 18-bit universal bus transceivers are members of the Texas Instruments SCOPETM testability integrated-circuit family. This family of devices supports IEEE Std 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.

Additionally, these devices are designed specifically for low-voltage (3.3-V) VCC operation, but with the capability to provide a TTL interface to a 5-V system environment.

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 SCOPETM universal bus transceivers.

Data flow in each direction is controlled by output-enable (OEAB\ and OEBA\), latch-enable (LEAB and LEBA), and clock (CLKAB and CLKBA) inputs. For A-to-B data flow, the devices operate in the transparent mode when LEAB is high. When LEAB is low, the A data is latched while CLKAB is held at a static low or high logic level. Otherwise, if LEAB is low, A data is stored on a low-to-high transition of CLKAB. When OEAB\ is low, the B outputs are active. When OEAB\ 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 OEBA\, LEBA, and CLKBA inputs.

In the test mode, the normal operation of the SCOPETM 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 Std 1149.1-1990.

Four dedicated test pins are used to 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 B-port outputs of 'LVT182512, which are designed to source or sink up to 12 mA, include equivalent 25- series resistors to reduce overshoot and undershoot.

The SN54LVT18512 and SN54LVT182512 are characterized for operation over the full military temperature range of -55°C to 125°C. The SN74LVT18512 and SN74LVT182512 are characterized for operation from -40°C to 85°C.

The 'LVT18512 and 'LVT182512 scan test devices with 18-bit universal bus transceivers are members of the Texas Instruments SCOPETM testability integrated-circuit family. This family of devices supports IEEE Std 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.

Additionally, these devices are designed specifically for low-voltage (3.3-V) VCC operation, but with the capability to provide a TTL interface to a 5-V system environment.

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 SCOPETM universal bus transceivers.

Data flow in each direction is controlled by output-enable (OEAB\ and OEBA\), latch-enable (LEAB and LEBA), and clock (CLKAB and CLKBA) inputs. For A-to-B data flow, the devices operate in the transparent mode when LEAB is high. When LEAB is low, the A data is latched while CLKAB is held at a static low or high logic level. Otherwise, if LEAB is low, A data is stored on a low-to-high transition of CLKAB. When OEAB\ is low, the B outputs are active. When OEAB\ 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 OEBA\, LEBA, and CLKBA inputs.

In the test mode, the normal operation of the SCOPETM 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 Std 1149.1-1990.

Four dedicated test pins are used to 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 B-port outputs of 'LVT182512, which are designed to source or sink up to 12 mA, include equivalent 25- series resistors to reduce overshoot and undershoot.

The SN54LVT18512 and SN54LVT182512 are characterized for operation over the full military temperature range of -55°C to 125°C. The SN74LVT18512 and SN74LVT182512 are characterized for operation from -40°C to 85°C.

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Technical documentation

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Type Title Date
* Data sheet 3.3-V ABT Scan Test Devices With 18-Bit Universal Bus Transceivers datasheet 01 Oct 1997
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 Dec 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 May 2002
Application note Power-Up 3-State (PU3S) Circuits in TI Standard Logic Devices 10 May 2002
Selection guide Advanced Bus Interface Logic Selection Guide 09 Jan 2001
Application note LVT-to-LVTH Conversion 08 Dec 1998
Application note LVT Family Characteristics (Rev. A) 01 Mar 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 Oct 1996
Application note Live Insertion 01 Oct 1996
Application note Understanding Advanced Bus-Interface Products Design Guide 01 May 1996

Design & development

For additional terms or required resources, click any title below to view the detail page where available.

Simulation model

BSDL Model of SN74LVT18512

SCTM027.ZIP (3 KB) - BSDL Model
Simulation model

SN74LVT18512 IBIS Model

SCEM049.ZIP (14 KB) - IBIS Model
Package Pins CAD symbols, footprints & 3D models
TSSOP (DGG) 64 Ultra Librarian

Ordering & quality

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Information included:
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