Enhanced Performance HDMI/DVI Level Shifter

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  • This page contains information on a product that is no longer manufactured (discontinued). Specifications and information herein are available for historical reference only.

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Block Diagram

PTN3381D Block Diagram

PTN3381D Block Diagram


High-speed TMDS level shifting

  • Converts four lanes of low-swing AC-coupled differential input signals to DVI v1.0 andHDMI v1.4b compliant open-drain current-steering differential output signals
  • TMDS level shifting operation up to 3 Gbit/s per lane (300 MHz character clock)supporting 36-bit deep color, 3D and 3 Gbit/s modes
  • Programmable equalizer
  • Integrated 50 Ω termination resistors for self-biasing differential inputs
  • Back-current safe outputs to disallow current when device power is off and monitor ison
  • Disable feature to turn off TMDS inputs and outputs and to enter low-power state

DDC level shifting

  • Integrated DDC buffering and level shifting (3.3 V source to 5 V sink side)
  • Rise time accelerator on sink-side DDC ports
  • 100 kHz I²C-bus clock frequency
  • Back-power safe sink-side terminals to disallow backdrive current when power is off orwhen DDC is not enabled

HDMI dongle detect support

  • Incorporates I²C target ROM
  • Responds to DDC read to address 81h with predetermined byte sequence
  • Feature enabled by pin DDET (must be enabled for correct operation in accordancewith DisplayPort interoperability guideline)

HPD level shifting

  • HPD non-inverting level shift from 0 V on the sink side to 0 V on the source side, orfrom 5 V on the sink side to 3.3 V on the source side
  • Integrated 200 kΩ pull-down resistor on HPD sink input guarantees ‘input LOW’ whenno display is plugged in
  • Back-power safe design on HPD_SINK to disallow backdrive current when power is off

5 V DC voltage regulator

  • Generates 5 V for the DVI/HDMI connector from the 3.3 V DP_PWR pin supplied bythe DisplayPort connector
  • Supports up to 75 mA of load current with an accuracy of ±300 mV
  • Only two external capacitors required
  • Eliminates need for an external 5 V regulator in dongle applications
  • Back drive protection on 5 V output
  • Short-circuit protection
  • Overcurrent protection


  • Power supply 2.85 V to 3.6 V
  • ESD resilience to 6 kV HBM, 1 kV CDM
  • Power-saving modes (using output enable)
  • Back-current-safe design on all sink-side main link, DDC and HPD terminals
  • Transparent operation: no re-timing or software configuration required

Target Applications

  • DisplayPort to HDMI adapters supporting 36-bit deep color, 3D and 3 Gbit/s modes
  • DisplayPort to DVI adapters required to drive long cables


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