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.