3.3V, 622Mbps LVDS, Dual 4:2 Crosspoint Switch

622Mbps Protection Switching with Zero Jitter Accumulation

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The MAX3640 is a dual-path crosspoint switch for use at OC-12 data rates. The MAX3640 can be used to receive and transmit 622Mbps low-voltage differential signals (LVDS) across a backplane with minimum jitter accumulation. Each path incorporates input buffers, multiplexers, a crosspoint switch, and output drivers. The four output channels have a redundant set of outputs for test or fanning purposes. The device offers signal-path redundancy for critical data streams.

The MAX3640 has a unique power-saving feature. When a set of four output channels has been de-selected, the output drivers are powered down to reduce power consumption by 165mW. The fully differential architecture ensures low crosstalk, jitter accumulation, and signal skew.

The MAX3640 is available in a 48-pin TQFP package and operates from a +3.3V supply over the 0°C to +85°C temperature range.
MAX3640: Typical Operating Circuit MAX3640: Typical Operating Circuit Enlarge+

Key Features

  • Single +3.3V Supply
  • 257mW Power Consumption (four output channels enabled)
  • 2.8psRMS Output Random Jitter
  • 42ps Output Deterministic Jitter
  • Power-Down Feature for Deselected Outputs
  • 110ps Channel-to-Channel Skew
  • 240ps Output Edge Speed
  • LVDS Inputs/Outputs
  • LVDS Output 3-State Enable


  • ATM Switch Cores
  • Digital Cross-Connects
  • High-Speed Parallel Links
  • SONET/SDH Backplanes
  • System Interconnects
Product Reliability Reports: MAX3640.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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