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DS42BR400 Datasheet

Quad 4.25 Gbps CML Transceiver

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March 27, 2008
DS42BR400
Quad 4.25 Gbps CML Transceiver with Transmit
De-Emphasis and Receive Equalization
General Description
The DS42BR400 is a quad 250 Mbps – 4.25 Gbps CML
transceiver, or 8-channel buffer, for use in backplane and ca-
ble 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
www.DcaotnatSrohlepeint4sU. .Tchoemse control pins provide customers flexibility
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 have 50termi-
nation to VCC. All receivers are internally terminated with
differential 100Ω.
Features
250 Mbps – 4.25 Gbps Fully Differential Data Paths
Optional Fixed Input Equalization
Selectable Output De-emphasis
Individual Loopback Controls
On-chip Termination
Lead-less eLLP-60 pin package (9 mm x 9 mm x 0.8 mm,
0.5 mm pitch)
−40°C to +85°C Industrial Temperature Range
6 kV ESD Rating, HBM
Applications
Backplane driver or cable driver
Signal repeating, buffering and conditioning applications
Simplified Application Diagram
20182440
© 2008 National Semiconductor Corporation 201824
www.national.com


National Semiconductor Electronic Components Datasheet

DS42BR400 Datasheet

Quad 4.25 Gbps CML Transceiver

No Preview Available !

Functional Block Diagram
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www.national.com
20182401
2


Part Number DS42BR400
Description Quad 4.25 Gbps CML Transceiver
Maker National Semiconductor
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DS42BR400 Datasheet PDF






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