1FEATURES

2• DC - 3.125 Gbps Low Jitter, Low Skew, Low

Power Operation

• Pin Selectable Transmit Pre-Emphasis and

Receive Equalization Eliminate Data

Dependant Jitter

• Wide Input Common Mode Voltage Range

Allows DC-Coupled Interface to LVDS, CML

and LVPECL Drivers

• LOS Circuitry Detects Open Inputs Fault

• Integrated 100Ω Input and Output

Terminations

• 8 kV ESD on LVDS I/O Pins Protects Adjoining

Components

• Small 6 mm x 6 mm WQFN-40 Space Saving

Package

APPLICATIONS

• Clock and Data Buffering and Repeating

• Copper Cable Driving and Equalization

• FR-4 Equalization

• OC-48 / STM-16

DESCRIPTION

The DS25BR440 is a 3.125 Gbps Quad LVDS buffer

optimized for high-speed signal routing and repeating

over lossy FR-4 printed circuit board backplanes and

balanced cables. Fully differential signal paths ensure

exceptional signal integrity and noise immunity.

The DS25BR440 features two levels of transmit pre-

emphasis (PE) and two levels of receive equalization

(EQ). Both of these features compensate for

interconnect losses and ultimately maximize noise

margin. A loss-of-signal (LOS) circuit monitors each

input channel and a unique LOS pin is asserted when

no signal is detected at that input.

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.

Each differential input and output is internally

terminated with a 100Ω resistor to lower device return

losses, reduce component count and further minimize

board space.