1 Features

1• 2:1 Multiplexer and 1:2 Buffer

• 0.25-Gbps to 4.25-Gbps Fully Differential Data

Paths

• Fixed Input Equalization

• Programmable Output Pre-Emphasis

• Independent Pre-Emphasis Controls

• Programmable Loopback Modes

• On-Chip Terminations

• ESD Rating of 6-kV HBM

• 3.3-V Supply

• Lead-Less WQFN-36 Package

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

2 Applications

• Backplane Drivers or Cable Drivers

• Redundancy and Signal Conditioning Applications

• CPRI/OBSAI

3 Description

The DS42MB100 device is a signal conditioning 2:1

multiplexer and 1:2 fan-out buffer designed for use in backplane-redundancy or cable driving applications.

Signal conditioning features include continuous time

linear equalization (CTLE) and programmable output

pre-emphasis that enable data communication in FR4

backplane up to 4.25 Gbps. Each input stage has a fixed equalizer to reduce ISI distortion from board

traces.

All output drivers have four selectable levels of pre-

emphasis to compensate for transmission losses from

long FR4 backplane or cable attenuation reducing

deterministic jitter. The pre-emphasis levels can be independently controlled for the line-side and switch-

side drivers. The internal loopback paths from switchside

input to switch-side output enable at-speed

system testing. All receiver inputs are internally

terminated with 100-Ω differential terminating

resistors. All driver outputs are internally terminated

with 50-Ω terminating resistors to VCC.