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.

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