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National Semiconductor Electronic Components Datasheet

DS42MB200 Datasheet

Dual 4.25 Gbps 2:1/1:2 CML Mux/Buffer

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DS42MB200 pdf
December 7, 2007
DS42MB200
Dual 4.25 Gbps 2:1/1:2 CML Mux/Buffer with Transmit Pre-
Emphasis and Receive Equalization
General Description
The DS42MB200 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 4.25 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 100differential terminating resistors.
Features
1– 4.25 Gbps fully differential data paths
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 (7mmx7mmx0.8mm, 0.5mm
pitch)
–40°C to +85°C operating temperature range
Applications
Backplane driver or cable driver
Redundancy and signal conditioning applications
XAUI
Functional Block Diagram
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© 2007 National Semiconductor Corporation 201786
20178633
www.national.com


National Semiconductor Electronic Components Datasheet

DS42MB200 Datasheet

Dual 4.25 Gbps 2:1/1:2 CML Mux/Buffer

No Preview Available !

DS42MB200 pdf
Simplified Block Diagram
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20178631
2


Part Number DS42MB200
Description Dual 4.25 Gbps 2:1/1:2 CML Mux/Buffer
Maker National Semiconductor
Total Page 16 Pages
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