DisplayPort 2:1 Multiplexer, DisplayPort v1.2 and Dual-mode compatible

The PS8331 is an integrated DisplayPort 2:1 multiplexer that is compatible with DisplayPort 1.2 and dual-mode DisplayPort signaling.  DisplayPort link rates up to 5.4Gbps are supported as well as Fast AUX.  When used for native DisplayPort signaling, the PS8331 will serve as a redriver by link training with the downstream DisplayPort Sink.  When used with a dual-mode upstream Source, PS8331 supports the use of AC coupled TMDS signaling up to a 300MHz TMDS clock rate, enabling the support of DVI or HDMI Sink devices through the use of a downstream level shifter device or external dual-mode cable adaptor.


  • Supports 2:1 multiplexing for Dual-mode DisplayPort signaling
  • Compliant to VESA® DisplayPort Standard version 1.2 including support for 1.62, 2.7 and 5.4-Gbps link rates
  • Automatic receiver equalization adjustment compensates for PCB, cable and connector losses
  • Built in redriver / repeater function provides link training with the downstream DisplayPort device using AUX interception
  • Supports all DP v1.2 pre-emphasis and output amplitude levels for 1, 2, or 4 lane DisplayPort configurations
  • Supports transmitter Feed Forward Equalizer (FFE) with Post Cursor 2 for HBR2
  • Compatible with dual-mode DisplayPort Source operation with a TMDS clock rate up to 300MHz
  • Built-in AUX Channel and DDC combiner for upstream dual-mode Source device
  • Supports Source initiated power management through AUX channel
  • Automatic power down management
  • Automatic output squelch during TMDS signal loss during dual-mode operation
  • Device pin control and local I2C bus control options
  • Single 3.3 V power supply option (PS8331B) or 3.3V / 1.5V dual supply option (PS8331A) for lowest power consumption
  • 5x9mm 60-pin QFN RoHS compliant and halogen free package
  • 0° to 70°C operating temperature range
  • ESD: HBM 8 kV


  • Notebook and desktop PC motherboards implementing switchable graphics
  • Notebook docking stations
  • Monitors
  • All-in-One systems to support external DisplayPort input
  • DisplayPort branch devices