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AD8155:  6.5 Gbps Dual Buffer Mux/Demux

Product Details

The AD8155 is an asynchronous, protocol-agnostic, dual-lane 2:1 switch with a total of six differential CML inputs and six differential CML outputs. The signal path supports NRZ signaling with data rates up to 6.5 Gbps per lane. Each lane offers programmable receive equalization, programmable output pre-emphasis, programmable output levels, and loss-of-signal detection.

The nonblocking switch-core of the AD8155 implements a 2:1 multiplexer and 1:2 demultiplexer per lane and supports independent lane switching through the two select pins, SEL[1:0]. Each port is a two-lane link. Every lane implements an asynchronous path supporting dc to 6.5 Gbps NRZ data, fully independent of other lanes. The AD8155 has low latency and very low lane-to-lane skew.

The main application of the AD8155 is to support redundancy on both the backplane and the line interface sides of a serial link. The demultiplexing path implements unicast and bicast capability, allowing the part to support either 1+1 or 1:1 redundancy.

The AD8155 is also suited for testing high speed serial links because of its ability to duplicate incoming data. In a port monitoring application, the AD8155 can maintain link connectivity with a pass-through connection from Port C to Port A while sending a duplicate copy of the data to test equipment on Port B.

The rich feature set of the AD8155 can be controlled either through external toggle pins or by setting on-chip control registers through the I2C® interface.


  • Low cost redundancy switch
  • SONET OC48/SDH16 and lower data rates
  • RXAUI, 4x Fibre Channel, Infiniband , and GbE over backplane
  • OIF CEI 6.25 Gbps over backplane
  • Serial data-level shift
  • 2-/4-/6-lane equalizers or redrivers

    • Dual 2:1 mux/1:2 demux
    • Optimized for dc to 6.5 Gbps NRZ data
    • Per-lane P/N pair inversion for routing ease
    • Programmable input equalization
      Compensates up to 40 inches of FR4
    • Loss-of-signal detection
    • Programmable output pre-emphasis up to 12 dB
    • Programmable output levels with squelch and disable
    • Accepts ac-coupled or dc-coupled differential CML inputs
    • 50 Ω on-chip termination
    • 1:2 demux supports unicast or bicast operation
    • Port-level loopback
    • See data sheet for additional Features

    Functional Block Diagram for AD8155

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    The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Analog Devices, Inc. sales office or authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.

    AD8155 Evaluation Board
    Model Description Price RoHS View PCN/ PDN Check Inventory/
    AD8155-EVALZ Status: Production Evaluation Board $895.00 Yes - Contact ADI

    Pricing displayed is based on 1-piece. The USA list pricing shown is for budgetary use only, shown in United States dollars (FOB USA per unit), and is subject to change. International prices may vary due to local duties, taxes, fees and exchange rates.

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