Product details


Function Equalizer, Mux buffer Protocols LVDS, LVPECL, CML Number of Tx 1, 2 Number of Rx 1, 2 Supply voltage (V) 3.3 Signaling rate (Mbps) 4250 Input signal CML Output signal CML Rating Catalog Operating temperature range (C) -40 to 85 open-in-new Find other LVDS, M-LVDS & PECL ICs


  • 2:1 Multiplexer and 1:2 Buffer
  • 0.25-Gbps to 4.25-Gbps Fully Differential Data Paths
  • Fixed Input Equalization
  • Programmable Output Pre-Emphasis
  • Independent Pre-Emphasis Controls
  • Programmable Loopback Modes
  • On-Chip Terminations
  • ESD Rating of 6-kV HBM
  • 3.3-V Supply
  • Lead-Less WQFN-36 Package
  • –40°C to +85°C Operating Temperature Range

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The DS42MB100 device is a signal conditioning 2:1 multiplexer and 1:2 fan-out buffer designed for use in backplane-redundancy or cable driving applications. Signal conditioning features include continuous time linear equalization (CTLE) and programmable output pre-emphasis that enable data communication in FR4 backplane up to 4.25 Gbps. Each input stage has a fixed equalizer to reduce ISI distortion from board traces.

All output drivers have four selectable levels of pre-emphasis to compensate for transmission losses from long FR4 backplane or cable attenuation reducing deterministic jitter. The pre-emphasis levels can be independently controlled for the line-side and switch-side drivers. The internal loopback paths from switch-side input to switch-side output enable at-speed system testing. All receiver inputs are internally terminated with 100-Ω differential terminating resistors. All driver outputs are internally terminated with 50-Ω terminating resistors to VCC.

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Technical documentation

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Type Title Date
* Datasheet DS42MB100 4.25-Gbps 2:1/1:2 CML MUX/Buffer With Transmit Pre-Emphasis and Receive Equalization datasheet (Rev. H) Oct. 14, 2015
Application notes Driving Signals Over XAUI Backplanes Using DS42MB100, DS40MB200, or DS42BR400 (Rev. B) Apr. 26, 2013

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How to Measure Jitter

Learn how to measure jitter using eye diagrams in this short,interactive video.

Posted: 21-Jan-2018
Duration: 05:04

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