XRT91L82ES Exar, XRT91L82ES Datasheet - Page 8

• Manufacturer Part Number: XRT91L82ES
• Description: Bus Transceivers Transceiver
• Manufacturer: Exar

Specifications of XRT91L82ES

• Product Category: Bus Transceivers
• Rohs: yes

XRT91L82
2.488/2.666 GBPS STS-48/STM-16 SONET/SDH TRANSCEIVER
COMMON CONTROL
REFREQSEL1
REFREQSEL0
REF2CLKP
REF2CLKN
/ SCLK
N
AME
LVPECL Diff
LVCMOS
LVCMOS
LVTTL,
LVTTL,
L
EVEL
T
YPE
I
I
I
A11
B11
D12
E12
P
IN
PRELIMINARY
Reference Clock Input 2
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. Pin REFREQSEL[1:0] determines the value used as
the reference. See Pin REFREQSEL[1:0] for more details.
Internally terminated and biased.
Reference Clock Frequency Select
Hardware Mode REFREQSEL1 pin is used to select the fre-
quency of the REF1CLK and/or REF2CLK input to the CMU
and CDR.
N
This pin is provided with an internal pull-down.
Host Mode This pin is functions as the microprocessor Serial
Clock Input.
Reference Clock Frequency Select
REFREQSEL0 pin is used to select the frequency of the
REF1CLK and/or REF2CLK input to the CMU and CDR.
N
This pin is provided with an internal pull-down.
OTE
OTE
5
REFREQSEL
REFREQSEL
: Non-FEC rates require 155.52 MHz clock reference.
: Non-FEC rates require 155.52 MHz clock reference.
[1:0]
[1:0]
00
01
10
00
01
10
11
11
FEC rates require 166.63 MHz clock reference
FEC rates require 166.63 MHz clock reference
155.52 MHz present on
155.52 MHz present on
166.63 MHz present on
166.63 MHz present on
155.52 MHz present on
155.52 MHz present on
166.63 MHz present on
166.63 MHz present on
REFERENCE FREQUENCY
REFERENCE FREQUENCY
REF2CLK not used
REF1CLK not used
REF2CLK not used
REF1CLK not used
REF1CLK
REF1CLK
REF2CLK
REF2CLK
REF1CLK
REF1CLK
REF2CLK
REF2CLK
D
CMU
CMU
ESCRIPTION
155.52 MHz present on
166.63 MHz present on
155.52 MHz present on
166.63 MHz present on
155.52 MHz present on
166.63 MHz present on
155.52 MHz present on
166.63 MHz present on
REFERENCE FREQUENCY
REFERENCE FREQUENCY
REF2CLK not used
REF1CLK not used
REF2CLK not used
REF1CLK not used
xr
xr
xr
xr
REF1CLK
REF2CLK
REF1CLK
REF2CLK
REF1CLK
REF2CLK
REF1CLK
REF2CLK
CDR
CDR
REV. P1.0.5