1FEATURES

2• 1– 4.25 Gbps Fully Differential Data Paths

• Fixed Input Equalization

• Programmable Output Pre-emphasis

• Independent Switch and Line Side Pre-

emphasis Controls

• Programmable Switch-side Loopback Mode

• On-chip Terminations

• +3.3V Dupply

• ESD Rating HBM 6 kV

• Lead-less WQFN-48 Package

(7mmx7mmx0.8mm, 0.5mm Pitch)

• –40°C to +85°C Operating Temperature Range

APPLICATIONS

• Backplane Driver or Cable Driver

• Redundancy and Signal Conditioning

Applications

• XAUI

DESCRIPTION

The DS42MB200 is a dual signal conditioning 2:1

multiplexer and 1:2 fan-out buffer designed for use in

backplane redundancy applications. Signal

conditioning features include input equalization and

programmable output pre-emphasis that enable data

communication in FR4 backplanes up to 4.25 Gbps.

Each input stage has a fixed equalizer to reduce ISI

distortion from board traces.

All output drivers have 4 selectable steps of pre-

emphasis to compensate for transmission losses from

long FR4 backplanes and reduce deterministic jitter.

The pre-emphasis levels can be independently

controlled for the line-side and switch-side drivers.

The internal loopback paths from switch-side input to

switch-side output enable at-speed system testing. All

receiver inputs are internally terminated with 100Ω

differential terminating resistors. All driver outputs are

internally terminated with 50Ω to VCC.