GENERAL DESCRIPTION
The XRT91L34 is a fully integrated quad channel 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 or 51.84 Mbps STS-1/STM-0 applications. The device provides Clock and Data Recovery (CDR) function by synchronizing its on-chip Voltage Controlled Oscillator (VCO) to the incoming serial data stream. The device internally monitors Loss of Lock (LOL) conditions and automatically mutes recovered data upon Loss of Signal (LOS) conditions.

FEATURES
• Quad Channel CDR targeted for SONET STS-12/STS-3/STS-1 and SDH STM-4/STM-1/STM-0 Applications
• Selectable data rate operation between 622.08 Mbps, 155.52 Mbps, or 51.84 Mbps.
• Single-chip fully integrated solution containing quad-channel clock and data recovery (CDR) functions
• Optional flexibility to configure for LVDS or Differential LVPECL High Speed I/O Interface
• Internal 100Ω termination for the high speed LVDS/Differential LVPECL inputs included
• Utilizes reference clock frequency of either 19.44 MHz or 77.76 MHz
• Host mode serial microprocessor interface simplifies monitor and control, including LOS monitoring
• Diagnostics features include LOS monitoring in Host Mode and automatic recovered data mute upon LOS
• Loss of Lock Detect output for each channel
• Permits mixed data rate configuration of the four channels
• Independent power down control of unused channels for lower power operation
• 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.
• Complies with ANSI/TIA/EIA-644 and IEEE P1596.3 3.3V LVDS standard, 3.3V Differential LVPECL, and JESD 8-B LVTTL and LVCMOS standard.
• Operates with dual power supply of 1.8V core and 3.3V IO supply
• 90mW LVDS/ 350mW Differential LVPECL per channel Typical Power Dissipation
• Package: 14 x 14 x 1.4 mm 128-pin LQFP
• RoHS Compliant Lead-Free package availability
• 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