XRT91L32ES Exar, XRT91L32ES Datasheet - Page 9

• Manufacturer Part Number: XRT91L32ES
• Description: LIN Transceivers SONET SDH 8 bit TRANCEIVER
• Manufacturer: Exar

Specifications of XRT91L32ES

• Product Category: LIN Transceivers
• Rohs: yes

xr
REV. 1.0.3
TRANSMITTER SECTION
TTLREFCLK
TXPCLK_O
REFCLKN
REFCLKP
N
AME
LVPECL Diff
LVTTL
LVTTL
L
EVEL
T
YPE
O
I
I
P
STS-12/STM-4 OR STS-3/STM-1 SONET/SDH TRANSCEIVER
82
29
30
56
IN
Transmit Parallel Clock Output (77.76/19.44 MHz)
Transmit Parallel Clock Output Operation
This pin will output a 77.76 MHz (STS-12/STM-4) or 19.44 MHz
(STS-3/STM-1) clock output reference for the 8-bit parallel
transmit data input TXDI[7:0]. This clock is used by the framer/
mapper device to present the TXDI[7:0] data which the
XRT91L32 will latch on the rising edge of this clock. This
enables the framer/mapper device and the XRT91L32 trans-
ceiver to be in synchronization.
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.
N
Auxillary Reference Clock Input (77.76 MHz or 19.44 MHz)
This LVTTL 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 LVTTL clock source.
Pin CMUFREQSEL determines the value used as the refer-
ence. See Pin CMUFREQSEL for more details.
N
OTE
OTE
7
: In the event that TTLREFCLK LVTTL input is used
: In the event that REFCLKP/N differential inputs is used
instead of these differential inputs for clock reference,
the REFCLKP should be tied to ground.
instead of this LVTTL input for clock reference, the
TTLREFCLK should be tied to ground.
D
ESCRIPTION
XRT91L32