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XRT91L80 Datasheet(PDF) 8 Page - Exar Corporation

Part # XRT91L80
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

XRT91L80 Datasheet(HTML) 8 Page - Exar Corporation

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XRT91L80
PRELIMINARY
xr
xr
xr
xr
2.488/2.666GBPS OC-48/STM-16 SONET/SDH TRANSCEIVER
REV. P1.0.4
6
TRANSMITTER SECTION
NAME
LEVEL
TYPE
PIN
DESCRIPTION
TXDI0P
TXDI0N
TXDI1P
TXDI1N
TXDI2P
TXDI2N
TXDI3P
TXDI3N
LVDS
I
H13
J13
K14
L14
K13
L13
M14
N14
Transmit Parallel Data Input
The 622Mbps 4-bit parallel transmit input data should be
applied to the transmitters simultaneously referenced to the ris-
ing edge of the TXCLKI input. The 4-bit parallel interface is
multiplexed into the transmit serial output interface MSB first
(TXDI3P/N).
NOTE:
The XRT91L80 can accept 666Mbps 4-bit parallel
transmit input data for Forward Error Correction (FEC)
Applications.
TXCLKIP
TXCLKIN
LVDS
I
H14
J14
Transmit Input Clock
622MHz input clock reference for the 4-bit parallel transmit
input data TXDIP/N[3:0].
NOTE:
The XRT91L80 can accept a 666MHz transmit input
clock for Forward Error Correction (FEC) Applications.
TXOP
TXON
CMLDIFF
O
K1
L1
Transmit Serial Data Output
The transmit serial data stream is generated by multiplexing the
4-bit parallel transmit input data into a 2.488Gbps serial data
stream. In Forward Error Correction, the transmit serial data
stream is 2.666Gbps.
REFCLKP
REFCLKN
LVPECL
I
P6
N6
Reference Clock Input
This differential input clock reference is used for the transmit
clock multiplier unit (CMU) to provide the necessary high speed
clock reference for this device. Pin REFFREQSEL determines
the value used as the reference. See Pin REFFREQSEL for
more details.
VCXO_INP
VCXO_INN
LVPECL
I
P4
N4
Voltage Controled Oscillator Input
This differential input clock is used for the transmit PLL jitter
attenuation. Pin REFFREQSEL determines the value used as
the reference. See Pin REFFREQSEL for more details.
REFFREQSEL
LVTTL
I
P1
Reference Clock Frequency Select
Hardware Mode This pin is used to select the frequency of the
REFCLK input to the CMU.
"Low" = 77.76MHz (83.5MHz for FEC)
"High" = 155.52MHz (167MHz for FEC)
This pin is provided with an internal active pull-down.
VCXO_SEL
LVTTL
I
M6
Selects De-Jitter VCXO Option
Hardware Mode This pin selects either the normal REFCLK or
the de-jitter VCXO as a reference clock.
"Low" = Normal REFCLK Mode
"High" = De-Jitter VCXO Mode
This pin is provided with an internal active pull-down.
VCXO_LOCK
LVTTL
O
N8
De-Jitter PLL Lock Detect
If the de-jitter PLL lock detect is enabled with Pin P3 and the
de-jitter VCXO mode is selected by Pin M6, this pin will pull
"High" when the PLL is locked.
"Low" = VCXO out of Lock
"High" = VCXO Locked


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