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XRT91L81 Datasheet(PDF) 11 Page - Exar Corporation

Part # XRT91L81
Description  2.488/2.666GBPS OC-48/STM-16 SONET/SDH TRANSCEIVER
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Manufacturer  EXAR [Exar Corporation]
Direct Link  http://www.exar.com
Logo EXAR - Exar Corporation

XRT91L81 Datasheet(HTML) 11 Page - Exar Corporation

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XRT91L81
2.488/2.666GBPS OC-48/STM-16 SONET/SDH TRANSCEIVER
PRELIMINARY
REV. P1.0.3
9
RXI0P
RXI0N
CMLDIFF
I
C1
D1
Primary Receive Serial Data Input
The receive serial data stream of 2.488Gbps is applied to the
primary input pins if RXSEL is "Low". In Forward Error Correc-
tion, the receive serial data stream is 2.666Gbps.
RXI1P
RXI1N
CMLDIFF
I
G1
F1
Secondary Receive Serial Data Input Port
The receive serial data stream of 2.488Gbps is applied to the
secondary input pins if RXSEL is "High". In Forward Error Cor-
rection, the receive serial data stream is 2.666Gbps.
RXSEL
LVTTL
I
A2
Receive Serial Data Select
Hardware Mode This pin is used to select the Receive Serial
Data Input from the primary or secondary inputs.
"Low" = RXI0
"High" = RXI1
REXT
-
I
A1
Limiting Amplifier Biasing Resistor
This pin should be pulled "Low" with a 499
Ω resistor.
RXCLK16P
RXCLK16N
LVDS
O
A6
A7
155.52 (166) MHz Reference Clock
This output clock reference is derived from the recovered clock
from the receive path.
LOCKDET_CDR
LVTTL
O
C7
CDR Lock Detect
This pin will be pulled "High" to indicate that the CDR is locked.
LOSEXT
LVTTL
I
B5
LOS or SD input from optical module
POLARITY
LVTTL
I
C4
Polarity for LOS input
Hardware Mode LOSEXT and POLARITY signals will be
Exclussive NORed internally to generate the correct polarity.
LOSDET
LVTTL
O
C5
LOS Detect
Flags LOS condition based on LOS/SD signal from optical
module.
DISRD
LVTTL
I
A3
Disable Receive Output Data Upon LOS
Hardware Mode If this pin is pulled "High", the receive output
data will automically pull "Low" when a LOS condition occurs.
"Low" = Disabled
"High" = Mute Data Upon LOS
RECEIVER SECTION
NAME
LEVEL
TYPE
PIN
DESCRIPTION


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