DS25MB100 Datasheet, PDF (1/16 Pages) National Semiconductor (TI) – 2.5 Gb/s 1:2 Mux/Buffer with Input Equalization and Output De-Emphasis

March 2007
DS25MB100
2.5 Gb/s 1:2 Mux/Buffer with Input Equalization and Output
De-Emphasis
General Description
The DS25MB100 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 in-
clude input equalization and programmable output de-em-
phasis 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 de-emphasis to compensate for trans-
mission losses from long FR4 backplane or cable attenuation
reducing deterministic jitter. The de-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 receiv-
er inputs and driver outputs are internally terminated with
100Ω differential terminating resistors.
Features
■ ^{2:1 multiplexer and 1:2 buffer}
■ ^{0.25–2.5 Gbps fully differential data paths}
■ ^{Fixed input equalization}
■ ^{Programmable output de-emphasis}
■ ^{Independent de-emphasis controls}
■ ^{Programmable loopback modes}
■ ^{On-chip terminations}
■ ^{HBM ESD rating 5.5 kV on all pins}
■ ^{+3.3V supply}
■ ^{Low power, 0.45 W typical}
■ ^{Lead-less LLP-36 package}
■ ^{−40°C to +85°C operating temperature range}
Applications
■ ^{Backplane driver or cable driver}
■ ^{Redundancy and signal conditioning applications}
■ ^{PCI Express}
■ ^{Serial ATA}
■ ^CPRI/OBSAI
Functional Block Diagram
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