TI Introduces Industry's First 3.3 V Supply PECL/TTL Translators

Low-Voltage Devices Among Seven New PECL Products Replacing Discontinued Agere Devices

DALLAS, Aug. 5 /PRNewswire/ -- Texas Instruments Incorporated (NYSE: TXN) (TI) today introduced seven pseudo emitter-coupled logic (PECL) and translator/transistor logic (TTL) drivers and receivers, including the industry's first 3.3-V PECL translators and five devices that are direct replacements for translators discontinued by Agere Systems Inc. (Agere). The devices translate between differential input logic levels and TTL output logic levels. Designed for handling digital data or clock signals over balanced transmission lines, they are well-suited for applications such as telecommunications and medical imaging. (See http://www.ti.com/sc04173 .)

The 3.3-V TB3R1 and TB3R2 quad differential PECL receivers offer a low- voltage migration path for designers who have previously used 5-V supply PECL devices. Five other devices -- the TB5D1M, TB5D2H, TB5R1, TB5R2 and TB5T1 -- have combined features to replace nine former Agere PECL devices. The devices match the original Agere pinouts, allowing for plug-in replacement. Each new device offers 3-kV HBM and 2-kV CDM electrostatic discharge (ESD) protection and an operating temperature range of -40 degrees C to 85 degrees C.

   Key Features

   Quad Differential PECL Drivers (TB5D1M and TB5D2H)
     --  Translate PECL input levels to TTL output logic levels
     --  5.0-V or 3.3-V supply operation
     --  (TB5D1M) Surge protection on differential outputs
     --  (TB5D2H) No line loading when Vcc = 0
     --  Three-state output with a third-state level of less than 0.1 V
     --  Logic inputs include internal pull-up resistors of approximately
         40 kOhm that are connected to Vcc to ensure a logical high level
         input if the inputs are open circuited.

   Quad Differential PECL Receivers (TB5R1, TB5R2, TB3R1, TB3R2)
     --  Translate PECL input levels to TTL output logic levels
     --  5-V supply (TB5R1, TB5R2)
     --  3.3-V supply (TB3R1, TB3R2)
     --  50 mV hysterisis (TB5R1, TB3R1)
     --  Preferred state output (TB5R2, TB3R2)
     --  Power-down loading characteristics of the receiver input circuit
         are approximately 8 kOhm relative to the power supplies to prevent
         loading the transmission line when the device is powered down.
     --  Enable inputs include internal pull-up resistors of approximately
         40 kOhm connected to Vcc to ensure a logical high level input if
         the inputs are open circuited.

   Dual Differential PECL Driver/Receiver (TB5T1)
     --  5-V supply
     --  Translates TTL input levels to differential PECL output levels
         (driver) or converts PECL input levels to TTL output levels
         (receiver).
     --  Logic inputs include internal pull-up resistors of approximately
         40 kOhm that are connected to VCC to ensure a logical high level
         input if the inputs are open circuited.
     --  Power-down loading characteristics of the receiver input circuit
         are approximately 8 kOhm relative to the power supplies to prevent
         loading the transmission line when the device is powered down.
     --  Each pair has its own common-mode enable control, allowing serial
         data and a control clock to be transmitted and received on a single
         circuit.
     --  In circuits with termination resistors, the line remains impedance-
         matched when the circuit is powered down.

  Available Today

The PECL translator devices are available now from TI and its authorized distributors. Packaging and suggested resale pricing listed below.

       Part Number and Description        Packages      Price 1ku resale

   TB5D1M    Quad driver with lightning     SOIC,             7.20
              protection (5V and 3.3V)    Gull-wing

   TB5D2H    Quad driver with no line       SOIC,             7.20
                loading with Vcc=0        Gull-wing
                  (5V and 3.3V)

   TB5R1     Quad receiver with 50mV        SOIC,             7.20
                 Hysteresis (5.5V)        Gull-wing

   TB5R2     Quad receiver with preferred   SOIC,             7.20
                  state output (5V)       Gull-wing

   TB5T1         Dual differential          SOIC,             7.20
                  transceiver (5V)        Gull-wing

   TB3R1     Quad receiver with 50mV        SOIC              8.65
                 Hysteresis (3.3V)

   TB3R2     Quad receiver with preferred   SOIC              8.65
                 state output (3.3V)


The PECL translators join other TI interface and clocking products meeting designers' needs in PECL to TTL translation applications, such as the CDCM1804 and CDCM1802 clock buffers, each of which provides both a LVPECL output and a LVCMOS output.

For more information on finding the most appropriate bus interface solution for today's advanced system architectures, please refer to the "Comparing Bus Solutions" application report available at http://www.ti.com/sc04173b .

Texas Instruments Incorporated provides innovative DSP and analog technologies to meet our customers' real world signal processing requirements. In addition to Semiconductor, the company's businesses include Sensors & Controls, and Educational & Productivity Solutions.

TI is headquartered in Dallas, Texas, and has manufacturing, design or sales operations in more than 25 countries.

   Please refer all reader inquiries to:  Texas Instruments Incorporated
                                          Semiconductor Group, SC-04173
                                          Literature Response Center
                                          14950 FAA Blvd.
                                                                           Ft.  Worth,  TX    76155
                                                                                    1-800-477-8924
 


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