3.125Gbps XAUI Quad Equalizer

Achieve Clean 3.125Gbps XAUI Interfaces over 40in Backplanes

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The MAX3980 quad equalizer provides compensation for transmission medium losses for four "lanes" of digital NRZ data at a 3.125Gbps data rate in one package. It is tailor-made for 10-Gigabit Ethernet (10GbE) backplane applications requiring attenuation of noise and jitter that occur in communicating from MAC to PMD or from MAC to Switch. In support of the IEEE®-802.3ae for the XAUI interface, the MAX3980 adaptively allows XAUI lanes to reach up to 40in (1.0m) on FR4 board material.

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

The MAX3980 is available in a 44-pin exposed-pad QFN package. The MAX3980 consumes only 700mW at +3.3V or 175mW per channel.
MAX3980: Typical Application Circuit MAX3980: Typical Application Circuit Enlarge+

Key Features

  • Four Differential Digital Data "Lanes" at 3.125Gbps
  • Spans 40in (1.0m) of FR4 PC Board
  • 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)

See parametric specs for Equalizers (Cable and Circuit Board) (9)

Part NumberApplicationsData Rate
Data Rate
Max. Reach @ Max. Data RateVSUPPLY
I/O TypeChannelsRx Eq. @ Max. Rate
Package/PinsOper. Temp.
minmaxtypSee Notes
Copper Cable Interconnect
Printed Circuit Board Interconnect
1m FR4
7m Cable
0 to +85$19.54 @1k

Pricing Notes:
This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific and version-specific prices and delivery, please see the price and availability page or contact an authorized distributor.

Technical Documents

App Note 863 MAX3980: Equalizing XAUI Backplanes with the MAX3980
Product Reliability Reports: MAX3980.pdf 
Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C   Material Composition  

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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