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XRT91L306 Datasheet(PDF) 10 Page - Exar Corporation

Part # XRT91L306
Description  STS-12/STM-4 OR STS-3/STM-1 SONET/SDH TRANSCEIVER
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Manufacturer  EXAR [Exar Corporation]
Direct Link  http://www.exar.com
Logo EXAR - Exar Corporation

XRT91L306 Datasheet(HTML) 10 Page - Exar Corporation

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XRT91L30
xr
STS-12/STM-4 OR STS-3/STM-1 SONET/SDH TRANSCEIVER
REV. 1.0.1
8
REFCLKP
REFCLKN
LVPECL Diff
I
16
17
Reference Clock Input (77.76 MHz or 19.44 MHz)
This differential clock input reference is used for the transmit
clock multiplier unit (CMU) and clock data recovery (CDR) to
provide the necessary high speed clock reference for this
device. It will accept either a 77.76 MHz or a 19.44 MHz Differ-
ential LVPECL clock source. Pin CMUFREQSEL determines
the value used as the reference. See Pin CMUFREQSEL for
more details. REFCLKP/N inputs are internally biased to 1.65V.
NOTE:
In the event that TTLREFCLK LVTTL input is used
instead of these differential inputs for clock reference,
the REFCLKP should be tied to ground.
TTLREFCLK
LVTTL,
LVCMOS
I
36
TTL Reference Clock Input (77.76 MHz or 19.44 MHz)
This optional LVTTL clock input reference is used for the trans-
mit clock multiplier unit (CMU) and clock data recovery (CDR)
to provide the necessary high speed clock reference for this
device rather than a differential clock source. It will accept
either a 77.76 MHz or a 19.44 MHz LVTTL clock source. Pin
CMUFREQSEL determines the value used as the reference.
See Pin CMUFREQSEL for more details.
NOTE:
In the event that REFCLKP/N differential inputs are
used instead of this LVTTL input for clock reference,
the TTLREFCLK should be tied to ground.
TRANSMITTER SECTION
NAME
LEVEL
TYPE
PIN
DESCRIPTION


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