DS25CP104 Datasheet | National Semiconductor

Description The DS25CP104 is a 3.125 Gbps 4x4 LVDS crosspoint switch optimized for high-speed 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 acplished via external pins or the System Management Bus (SMBus) interface. The DS25CP104 features 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 mon 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. Each differential input and output is internally terminated with a 100Ω resistor to lower device insertion and return losses, reduce ponent count and further minimize board space. Features - DC - 3.125 Gbps low jitter, low skew, low power operation - Pin and SMBus configurable, fully differential, nonblocking architecture - Pin (two levels) and SMBus (four levels) selectable preemphasis and equalization eliminate ISI jitter to CML and LVPECL drivers - Wide Input mon Mode Range enables easy interface - LOS circuitry detects open inputs fault condition - On-chip 100Ω input and output termination minimizes insertion and return losses, reduces ponent count and minimizes board space - 8 k V ESD on LVDS I/O pins protects adjoining ponents - Small 6 mm x 6 mm LLP-40 space saving package Applications - - - -...