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