GENERAL DESCRIPTION
The AD8156, a member of the Xstream line of products, is a high speed, fully differential, digital crosspoint switch. The part can function as a 4 × 4 crosspoint switch with double-latched memory, allowing simultaneous updates, or as a dual 2 × 2 with direct output control. The AD8156 has low power dissipation, typically 700 mW on 3.3 V with all outputs and input equalizers active. It operates at any data rate from dc to 6.25 Gbps per port.
Each input channel on the AD8156 has a programmable input equalizer to compensate for signal loss over a backplane.

FEATURES
   4 × 4, fully differential, nonblocking array
   Configurable for dual 2 × 2 operation
   DC to 6.25 Gbps per channel, NRZ data rate
   Programmable input equalization compensates for over 40”
      of FR-4 at 6.25 Gbps
   Multicast and broadcast modes of operation
   Programmable output swing
      100 mV p-p to 1.6 V p-p differential
   Power supply: 3.3 V (±10%)
   Low power
      No EQ: 400 mW typical
      Maximum EQ: 700 mW typical
   Inputs: ac-coupled or dc-coupled
   Wide set of dc-coupled input standards
      3.3 V/2.5 V/1.8 V CML or 3.3 V LVPECL
   Control: LVTTL- or LVCMOS-compatible
   Low additive jitter: 25 ps p-p typical
   Low random jitter: 0.8 ps rms
   Integrated 50 Ω termination impedance at inputs/outputs
   Individual output disable for power savings
   49-ball, 8 mm × 8 mm BGA, 1 mm pitch

APPLICATIONS
   Backplane equalization
   SONET/SDH
   Gigabit Ethernet
   XAUI
   Fibre Channel