XRT91L33 Datasheet, PDF (1/16 Pages) Exar Corporation – STS-12/STS-3 MULTIRATE CLOCK AND DATA RECOVERY UNIT

XRT91L33
STS-12/STS-3 MULTIRATE CLOCK AND DATA RECOVERY UNIT
AUG 2008
REV. V1.0.0
FEATURES
• Performs clock and data recovery for selectable
data of 622.08 Mbps (STS-12/STM-4) or 155.52
Mbps (STS-3/STM-1) NRZ data
• Meets Telcordia, ANSI and ITU-T G.783 and G.825
SDH jitter requirements including T1.105.03 - 2002
SONET Jitter Tolerance specification, and GR-253
CORE, GR-253 ILR SONET Jitter specifications.
• Lock output pin monitors data run length and
frequency drift from reference clock
• Data is resampled at the output
• Active High Signal Detect (SIGD) LVPECL input
• Low jitter, high-speed outputs support LVPECL and
low-power LVDS termination
• 19.44 MHz reference frequency LVTTL input
• Low power: 215 mW typical
• 3.3V power supply
• 20-pin TSSOP package
• Requires one external capacitor
• PLL bypass operation facilitates board debug
process
• ESD greater than 2kV on all pins
APPLICATIONS
• SONET/SDH-based Transmission Systems
• Add/Drop Multiplexers
• Cross Connect Equipment
• ATM and Multi-Service Switches, Routers and
Switch/Routers
• DSLAMS
• SONET/SDH Test Equipment
• DWDM Termination Equipment
GENERAL DESCRIPTION
The XRT91L33 is a fully integrated multirate Clock
and Data Recovery (CDR) device for SONET/SDH
622.08 Mbps STS-12/STM-4 or 155.52 Mbps STS-3/
STM-1 applications. The device provides Clock and
Data Recovery (CDR) function by synchronizing its
on-chip Voltage Controlled Oscillator (VCO) to the
incoming serial scrambled non-return to zero (NRZ)
data stream. Figure 1 shows the block diagram of
the XRT91L33.
FIGURE 1. BLOCK DIAGRAM OF XRT91L33
STS12_MODE
REFCK
19.44 MHz
CAP+
1u F
CAP+
TEST
RX LOOP
FILTER
RXDIP
RXDIN
External
100R
termination
Differential
Receiver
RXDATAIN
Internal
biasing
LCKTOREFN
SIGD
PLL
CDR
STS-12/3
or
STM-4/1
Clock and Data
Recovery
LVDS/LVPECL
RECVD- ^{Output Drivers}
DATAOUT
0
1
RECVD-
CLKOUT
MUTE
RXDO
RXDOP
RXDON
RXCLKOP
RXCLKON
LOCK
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • [phone] • FAX [phone] • www.exar.com