DS42BR400 Datasheet, PDF (1/12 Pages) National Semiconductor (TI) – Quad Transceiver with Input Equalization and Output De-Emphasis

May 2006
DS42BR400
Quad Transceiver with Input Equalization and Output
De-Emphasis
General Description
The DS42BR400 is a quad 250 Mbps – 4.25 Gbps CML
transceiver, or 8-channel buffer, for use in XAUI Fibre Chan-
nel backplane and cable applications. With operation down
to 250 Mbps, the DS42BR400 can be used in applications
requiring both low and high frequency data rates. Each input
stage has a fixed equalizer to reduce ISI distortion from
board traces. The equalizers are grouped in fours and are
enabled through two control pins. These control pins provide
customers flexibility in XAUI applications where ISI distortion
may vary from one direction to another. All output drivers
have four selectable steps of de-emphasis to compensate
against transmission loss across long FR4 backplanes. The
de-emphasis blocks are also grouped in fours. In addition,
the DS42BR400 also has loopback control capability on four
channels. All CML drivers and receivers are internally termi-
nated with 50Ω pull-up resistors.
Features
n Quad 4.25 Gbps Transceiver or 8-Channel CML Serial
Buffer
n 250 Mbps – 4.25 Gbps Fully Differential Data Paths
n Optional Fixed Input Equalization
n Selectable Output De-emphasis
n Individual Loopback Controls
n On-chip Termination
n +3.3V supply
n Low Power, 1.3 Watts MAX
n Lead-less eLLP-60 pin package
(9mmx9mmx0.8mm, 0.4mm pitch)
n −40˚C to +85˚C Industrial Temperature Range
n 6 kV ESD Rating, HBM
Functional Block Diagram
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