DS40MB200_07 Datasheet, PDF (1/16 Pages) National Semiconductor (TI) – Dual 4.0 Gbps 2:1/1:2 CML Mux/Buffer with Transmit Pre-Emphasis and Receive Equalization

December 6, 2007
DS40MB200
Dual 4.0 Gbps 2:1/1:2 CML Mux/Buffer with Transmit Pre-
Emphasis and Receive Equalization
General Description
The DS40MB200 is a dual signal conditioning 2:1 multiplexer
and 1:2 fan-out buffer designed for use in backplane redun-
dancy applications. Signal conditioning features include input
equalization and programmable output pre-emphasis that en-
able data communication in FR4 backplanes up to 4 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 back-
planes and reduce deterministic jitter. The pre-emphasis lev-
els 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 test-
ing. All receiver inputs and driver outputs are internally
terminated with 100Ω differential terminating resistors
Features
■ ^{1– 4 Gbps low jitter operation}
■ ^{Fixed input equalization}
■ ^{Programmable output pre-emphasis}
■ ^{Independent switch and line side pre-emphasis controls}
■ ^{Programmable switch-side loopback mode}
■ ^{On-chip terminations}
■ ^{+3.3V supply}
■ ^{ESD rating HBM 6 kV}
■ ^{Lead-less LLP-48 package (7 mm x 7 mm)}
■ ^{0°C to +85°C operating temperature range}
Applications
■ ^{Backplane or cable driver}
■ ^{Redundancy and signal conditioning applications}
■ ^{XAUI, Infiniband}
Functional Block Diagram
© 2007 National Semiconductor Corporation 200217
20021733
www.national.com