XRT91L32ES Exar, XRT91L32ES Datasheet - Page 6

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

Specifications of XRT91L32ES

• Product Category: LIN Transceivers
• Rohs: yes

XRT91L32
STS-12/STM-4 OR STS-3/STM-1 SONET/SDH TRANSCEIVER
PIN DESCRIPTIONS
L32
HARDWARE CONTROL
CMUFREQSEL
STS12/STS3
RESET
N
AME
LVTTL
LVTTL
LVTTL
L
EVEL
T
YPE
I
I
I
P
97
4
8
IN
Remote Serial Loopback
Active "High." When this pin is pulled "High" , the internal state
machines are set to their default state.
"Low" = Normal Operation
"High" = Master Hardware Reset ( minimum 100nS)
Data Rate Selection
Selects SONET/SDH transmission and reception speed rate
"Low" = STS-3/STM-1 155.52 Mbps
"High" = STS-12/STM-4 622.08 Mbps
Clock Multiplier Unit Reference Frequency Select
This pin is used to select the frequency of the REFCLKP/N or
TTLREFCLK input to the CMU.
"Low" = 77.76 MHz reference clock
"High" = 19.44 MHz reference clock
N
OTE
4
FREQSEL
CMU-
: REFCLKP/N or TTLREFCLK input should be generated
0
0
1
1
from an LVPECL/LVTTL crystal oscillator which has a
frequency accuracy better than 20ppm in order for the
transmitted data rate frequency to have the necessary
accuracy required for SONET systems..
STS12/
STS3
0
1
0
1
D
ESCRIPTION
REFCLKP/N
TTLREFCLK
REFERENCE
FREQUENCY
77.76 MHz
77.76 MHz
19.44 MHz
19.44 MHz
OR
xr
STS-12/STM-4
STS-12/STM-4
STS-3/STM-1
STS-3/STM-1
155.52 Mbps
622.08 Mbps
155.52 Mbps
622.08 Mbps
D
ATA
R
REV. 1.0.3
ATE