XRT91L33A Datasheet, PDF (1/18 Pages) Exar Corporation – STS-12/STS-3 MULTIRATE CLOCK AND DATA RECOVERY UNIT

XRT91L33A
STS-12/STS-3 MULTIRATE CLOCK AND DATA RECOVERY UNIT
JUNE 2010
REV. 1.0.1
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 is a status output that monitors data run
length and frequency drift away from the 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
 Enhanced Jitter performance
 Meets both Jitter tolerance and generation
requirements
APPLICATIONS
 SONET/SDH-based Transmission Systems
 DSLAMS and Add/Drop Multiplexers
 Cross Connect Equipment
 ATM and Multi-Service Switches, Routers and
Switch/Routers
 DWDM Termination Equipment
GENERAL DESCRIPTION
The XRT91L33A 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 XRT91L33A.
FIGURE 1. BLOCK DIAGRAM OF XRT91L33A
STS12_MODE
REFCK
19.44 MHz
CAP+
1u F
CAP-
TEST
RX LOOP
FILTER
RXDIP
RXDIN
External
100R
termination
Differential
Receiver
RXDATAIN
Internal
biasing
PLL
CDR
STS -12/3
or
STM-4/1
Clock and Data
Recovery
LVDS/LVPECL
RECVD- ^{Output Drivers}
DATAOUT
0
1
RECVD-
CLKOUT
RXDOP
RXDON
RXCLKOP
RXCLKON
LCKTOREFN
SIGD
MUTE
RXDO
LOCK
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