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National Semiconductor Electronic Components Datasheet

DS25MB200 Datasheet

Dual 2.5 Gbps 2:1/1:2 CML Mux/Buffer

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April 9, 2008
DS25MB200
Dual 2.5 Gbps 2:1/1:2 CML Mux/Buffer with Transmit Pre-
Emphasis and Receive Equalization
General Description
The DS25MB200 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 2.5 Gbps.
Each input stage has a fixed equalizer to reduce ISI distortion
from board traces. All output drivers have 4 selectable steps
www.DoaftparSeh-eemetp4hUa.csiosmto 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 sys-
tem testing. All receiver inputs are internally terminated with
100differential terminating resistors. All drivers are inter-
nally terminated with 50to VCC.
Features
0.6–2.5 Gbps low jitter operation
Fixed input equalization
Programmable output pre-emphasis
Independent switch and line side pre-emphasis controls
Programmable switch-side loopback modes
On-chip terminations
HBM ESD rating 6 kV on all pins
+3.3V supply
Lead-less LLP-48 package (7mm x 7mm x 0.8mm, 0.5mm
pitch)
—40°C to +85°C operating temperature range
Applications
Backplane or cable driver
Redundancy and signal conditioning applications
Functional Block Diagram
© 2008 National Semiconductor Corporation 201823
20182333
www.national.com


National Semiconductor Electronic Components Datasheet

DS25MB200 Datasheet

Dual 2.5 Gbps 2:1/1:2 CML Mux/Buffer

No Preview Available !

Simplified Block Diagram
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20182331
2


Part Number DS25MB200
Description Dual 2.5 Gbps 2:1/1:2 CML Mux/Buffer
Maker National Semiconductor
Total Page 14 Pages
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