1FEATURES
2• DC - 3.125 Gbps Low Jitter, Low Skew, Low
Power Operation
• Pin and SMBus Configurable, Fully
Differential, Non-Blocking Architecture
• Pin (Two Levels) and SMBus (Four Levels)
Selectable Pre-Emphasis and Equalization
Eliminate ISI Jitter
• Wide Input Common Mode Range Enables
Easy Interface to CML and LVPECL Drivers
• LOS Circuitry Detects Open Inputs Fault
Condition
• On-Chip 100Ω Input and Output Termination
Minimizes Insertion and Return Losses,
Reduces Component Count, Minimizes Board
Space The DS25CP114 Eliminates the On-Chip
Input Termination for Added Design Flexibility.
• 8 kV ESD on LVDS I/O Pins Protects Adjoining
Components
• Small 6 mm x 6 mm WQFN-40 Space Saving
Package

APPLICATIONS
• SD/HD/3G HD SDI Routers
• OC-48 / STM-16
• InfiniBand and FireWire

DESCRIPTION
The DS25CP104A and DS25CP114 are 3.125 Gbps
4x4 LVDS crosspoint switches optimized for highspeed
signal routing and switching over lossy FR-4
printed circuit board backplanes and balanced cables.
Fully differential signal paths ensure exceptional
signal integrity and noise immunity. The non-blocking
architecture allows connections of any input to any
output or outputs. The switch configuration can be
accomplished via external pins or the System
Management Bus (SMBus) interface.
The DS25CP104A and DS25CP114 feature four
levels (Off, Low, Medium, High) of transmit pre- emphasis (PE) and four levels (Off, Low, Medium,
High) of receive equalization (EQ) settable via the
SMBus interface. Off and Medium PE levels and Off
and Low EQ levels are settable with the external pins.
In addition, the SMBus circuitry enables the loss of
signal (LOS) monitors that can inform a system of the
presence of an open inputs condition (e.g. disconnected cable).
Wide input common mode range allows the switch to
accept signals with LVDS, CML and LVPECL levels;
the output levels are LVDS. A very small package
footprint requires a minimal space on the board while the flow-through pinout allows easy board layout. On
the DS25CP104A each differential input and output is
internally terminated with a 100Ω resistor to lower
return losses, reduce component count and further
minimize board space. For added design flexibility the
100Ω input terminations on the DS25CP114 have
been eliminated. This enables a designer to build
custom crosspoint configurations and distribution
circuits that require a limited multidrop signaling
topology.