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Texas Instruments Introduces New Low-Voltage Universal Bus Transceivers

Strengthens Lead in the IEEE Standard 1149.1 Boundary-Scan Logic Market

 DALLAS (March 3, 1997) – Texas Instruments, the leader in IEEE Standard 1149.1 (JTAG) boundary-scan logic solutions according to the industry analyst firm Insight Onsite, announces a new family of low-voltage JTAG Universal Bus Transceivers (UBT). Building on the success and market adoption of the Advanced BiCMOS Technology (ABT) family of JTAG UBTs, TI has extended their JTAG portfolio with the new Low-Voltage Technology (LVT) family. The LVT UBT devices are the only IEEE Standard 1149.1 (JTAG) 3.3V UBT solutions on the market, and are widely used in applications such as telecommunications, internetworking and wireless infrastructure systems.

 The LVT devices, designated the LVTH18502A, LVTH182502A, LVTH18504A and LVTH182504A, are IEEE Standard 1149.1 solutions for 3.3V applications. The ABT devices, designated the ABTH18502A, ABTH182502A, ABTH18504A, and ABTH182504A are IEEE Standard 1149.1 solutions for 5V applications. These devices deliver IEEE Standard 1149.1 solutions to board/system designers for use in all applications implementing bus devices and are a cost-effective way to integrate test and maintainability into the systems. Both families have bus hold, series damping resistor option and are also available in military grade. Six additional devices are planned for the LVT portfolio, all in a 64-pin thin shrink-small outline package (TSSOP).

 Functions of a Universal Bus Transceiver

The UBT can replace more than 50 standard bus-interface devices, increasing design flexibility. A single UBT can serve several different functions, including:

  • bus driver
  • bus latch
  • bus flip-flop
  • bus flip-flop with clock enable
  • standard transceiver
  • latched transceiver
  • registered transceiver
  • registered transceiver with clock enable

 

Features/Benefits

 

  • IEEE Standard 1149.1 (JTAG) Compliance

Increases test coverage and facilitates embedded system-level test.
  • Flexible/universal function

Simplifies design -- 1 UBT can replace more than 50 bus-interface logic devices.
  • 3.3V powered

Lowers overall system power requirements.
  • 5V tolerant I/O

Supports interface to 5V devices in mixed-mode 3.3V/5V applications and provides seamless migration to 3.3V.
  • High drive (-32/64mA) outputs and propagation delays less than 6.0ns

Delivers ABT-equivalent performance for demanding 3.3V applications.
  • Series damping resistor option (18250X devices)

Improves signal integrity by preventing overshoots and undershoots.
  • Bus hold

Eliminates the need for resistors on inputs, saves board space, lowers component cost, and consumes less power.
  • TQFP packaging

Saves board space.

 

End Equipment Applications

  • Telecommunications
  • Wireless infrastructure
  • Internetworking
  • Workstations/high-end servers

 

Pricing, Packaging and Availability

The LVTH18502A, LVTH182502A, LVTH18504A and LVTH182504A are now available from Texas Instruments and its authorized distributors. The devices are in a 64-pin thin quad flat pack (TQFP) and are priced at $13.33* in quantities of 1,000 or more.

* Price revised 8/1/97.

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