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
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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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Related Resources

Belle Isle 2020
05/29/2020 - 05/31/2020, Detroit, MI
2020 Detroit Grand Prix - Chevrolet Detroit Grand Prix presented by Lear Fast Facts The Chevrolet Detroit Grand Prix presented by Lear was hosted on Belle Isle, May 29 - 30 2020. The event featured the cars of the NTT IndyCar Series, the IMSA WeatherTech SportsCar Championship and the Trans Am Series presented by Pirelli. The weekend is collectively referred to as the Chevrolet Detroit Grand Prix presented by Lear and it once again featured the Chevrolet Dual in Detroit IndyCar doubleheader.