3.125Gbps XAUI Quad Cable Equalizer

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The MAX3981 quad equalizer provides compensation for transmission medium losses for four "lanes" of digital NRZ data at a data rate of 3.125Gbps in one package. It is tailor-made for 10Gigabit Ethernet applications that require attenuation of noise and jitter that occur in communicating with chassis-to-chassis interconnect. In support of IEEE-802.3ae for the XAUI interface, the MAX3981 adaptively allows XAUI lanes to reach 10m (33ft) with inexpensive twin-axial cable for extended backplane applications.

The equalizer has 100Ω differential CML data inputs and outputs.

The MAX3981 is available in a 44-pin exposed-pad QFN package. The MAX3981 consumes only 700mW at 3.3V or 175mW per channel.
MAX3981: Typical Operating Circuit MAX3981: Typical Operating Circuit Enlarge+

Key Features

  • Four Differential Digital Data "Lanes" at 3.125Gbps
  • Span 10m (33ft) of Twin-Axial Cable
  • Receiver Equalization Reduces Intersymbol Interference (ISI)
  • Low Power, 175mW per Channel
  • Standby Mode—Power-Down State
  • Single 3.3V Supply
  • Signal Detect


  • IEEE-802.3ae XAUI Interface (3.125Gbps)
  • InfiniBand® (2.5Gbps)

Quality and Environmental Data

Request Reliability Report for: MAX3981 
Lead-Free Package Tin (Sn) Whisker Reports

CAD Symbols and Footprints

  • MAX3981UTH+
  • MAX3981UTH+T
  • Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C  

    Note : The failure rates are summarized by technology and mapped to the associated material part numbers. The failure rates are highly dependent on the number of units tested.

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