The DS25MB200 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 2.5 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 drivers are internally
terminated with 50Ω to VCC.
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