XRT91L30
OC-12/3 SONET/SDH 8 Bit Transceiver
Exar Corporation offers an extensive portfolio of
products for networking and transmission
applications
T
he XRT91L30 is a fully integrated SONET/SDH transceiver
for SONET OC-12/3 and SDH STM-4/1 applications. The
transceiver includes an on-chip Clock Multiplier Unit (CMU),
which uses a high frequency Phase-Locked Loop (PLL) to
generate the high-speed transmit serial clock from slower external
clock references. It also provides Clock and Data Recovery (CDR)
functions by synchronizing its on-chip Voltage Controlled
Oscillator (VCO) to the incoming serial data stream. The chip
provides serial-to-parallel and parallel-to-serial converters and 8bit Transistor-to-transistor logic (TTL) system interfaces in both
receive and transmit directions. The transmit section includes an
Elastic Buffer First In First Out (FIFO) to absorb any phase
differences between the transmitter input clock and the internally
generated transmitter reference clock. The operation of the device
can be monitored by checking the status of the Lock Detect and
Loss of Signal output signals.
The low-jitter, parallel 8-bit, TTL interface guarantees compliance
with the bit-error rate requirements of the Telecordia and ITU-T
standards.
Major Features
• 622.08/155.52 Mbps Transceiver
• Single-chip fully integrated
solution containing parallelto-serial converter, clock
multiplier unit (CMU), serialto-parallel converter and
clock data recovery (CDR)
functions
• Targeted for SONET OC-12/3
and SDH STM-4/1
Applications
• Internal FIFO decouples
transmit input and output
clocks
XRT91L30
OC-12/3 SONET/SDH 8 Bit Transceiver
XR91L30 Block Diagram
0C-12/3 TRANSCEIVER
WP
FIFO_RST
FIFO
FIFO_AUTORST
TxDI0P/N
TxDI1P/N
TxDI 7 P/N
PISO
(Parallel Input
Serial Output)
Re-Timer
TXOP/N
CDR
RXI0P/N
RP
TxCLKIP/N
TXPCLKOP /N
TXCLKO32P/N
CMU
RLOOPP
DLOOP
TRITXCLKO
RxDO0P/N
RxDO1P/N
RLOOPS
SIPO
(Serial Input
Parallel Output )
RxDO 7 P/N
RxCLKP/N
RXCLK32P/N
DISRD
LOCKDET_CDR
LOCKDET_CMU
LOSDET
LOSEXT
POLARITY
TEST
OVERFLOW
Hardware
Control
RLOOPS
RLOOPP
DLOOP
LPTIME_JA
LPTM_NO_JA
LOOPBW
Serial
Microprocessor
CS
SCLK
SDI
SDO
Host/Hw
JTAG
INT
Reset
TDO
TDI
TCK
TMS
TRST
Applications
Features
• Provides Local, Remote and Split Loop-Back
modes as well as Loop Timing mode
• SONET/SDH-based Transmission Systems
• Add/Drop Multiplexers
• Diagnostics features include various lock detect
functions
• Cross Connect Equipment
• Meets Telcordia, ANSI & ITU-T jitter require
ments
• ATM and Multi-Service Switches, Routers
and Switch/Routers
• 3.3V PECL High-Speed Interface
• DSLAMS
• 8-bit TTL Parallel Interface
• SONET/SDH Test Equipment
• Single 3.3 Volts Power Supply
• DWDM Termination Equipment
• 500mW Typical Power Dissipation
• Package: 10 x 10 mm 64-pin PQFP
• IEEE 1149.1 Compatable JTAG port
• No external passive components required
• No external heatsink or airflow required
• ESD greater than 2kV on all pins
Ordering Information
Product No.
Package
Operating
Temp. Range
64 PQFP
-40ºC to +85ºC
• Reference frequency of 77.76/19.44 MHz
• Loss of Signal Detect on the High Speed interface
FLY0905_XRT91L30
©2005 Exar Corporation
XRT91L30IQ
Exar Corporation • 48720 Kato Road • Fremont, CA 94538 • 510.668.7000 • fax 510.668.7001 • www.exar.com