1 Features
1• 2:1 Multiplexer and 1:2 Buffer
• 0.25-Gbps to 2.5-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
• Low power, 0.45 W Typical
• Lead-Less WQFN-36 Package
• −40°C to +85°C Operating Temperature Range

2 Applications
• Backplane Drivers or Cable Driver
• Redundancy and Signal Conditioning Applications
• CPRI/OBSAI

3 Description
The DS25MB100 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 2.5 Gbps. Each input stage has a
fixed equalizer to reduce ISI distortion from board
traces.
All output drivers have four selectable levels of preemphasis
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 switchside
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.