2-bit Bidirectional Low Voltage Translator

The Gunning Transceiver Logic – Transceiver Voltage Clamps (GTL-TVC) provide high-speed voltage translation with low ON-state resistance and minimal propagation delay. The GTL2002 provides 2 NMOS pass transistors (Sn and Dn) with a common gate (GREF) and a reference transistor (SREF and DREF). The device allows bidirectional voltage translations between 1.0 V and 5.0 V without use of a direction pin.

When the Sn or Dn port is LOW the clamp is in the ON-state and a low resistance connection exists between the Sn and Dn ports. Assuming the higher voltage is on the Dn port, when the Dn port is HIGH, the voltage on the Sn port is limited to the voltage set by the reference transistor (SREF). When the Sn port is HIGH, the Dn port is pulled to VCCby the pull-up resistors. This functionality allows a seamless translation between higher and lower voltages selected by the user, without the need for directional control.

Product Block Diagram

Product Block Diagram

Why Used?

  • Allows voltage level translation between 1.0 V, 1.2 V, 1.5 V, 1.8 V, 2.5 V, 3.3 V and 5 V buses, which allows direct interface with GTL, GTL+, LVTTL/TTL and 5 V CMOS levels
  • Provides bidirectional voltage translation with no direction pin
  • Low 6.5 Ω ON-state resistance (Ron) between input and output pins (Sn/Dn)
  • No power supply required; will not latch up
  • Low standby current

Where Used?

  • Any application that requires bidirectional or unidirectional voltage level translation from any voltage between 1.0 V and 5.0 V to any voltage between 1.0 V and 5.0 V
  • The open-drain construction with no direction pin is ideal for bidirectional low voltage (e.g., 1.0 V, 1.2 V, 1.5 V, or 1.8 V) processor I²C-bus port translation to the normal 3.3 V or 5.0 V I²C-bus signal levels or GTL/GTL+ translation to LVTTL/TTL signal levels

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