GENERAL DESCRIPTION
The XRT91L80 is a fully integrated SONET/SDH transceiver for SONET OC-48/STM-16 applications supporting the use of Forward Error Correction (FEC) capability.

FEATURES
• 2.488 / 2.666 Gbps Transceiver
• Targeted for SONET OC-48/SDH STM-16 Applications
• Selectable full duplex operation between standard rate of 2.488 Gbps or Forward Error Correction rate of 2.666 Gbps
• Single-chip fully integrated solution containing parallel-to-serial converter, clock multiplier unit (CMU), serialto-parallel converter, and clock data recovery (CDR) functions
• 4-bit LVDS signaling data paths running at 622.08/666.51 Mbps compliant with OIF SFI-4 Implimentation Agreement
• Non-FEC and FEC rate REFCLKP/N single reference input port
• Supports 77.76/83.31 MHz or 155.52/166.63 MHz transmit and receive external reference input port
• Optional VCXO input port support multiple de-jittering modes
• On-chip phase detector and charge pump for external VCXO based de-jittering PLL
• Internal FIFO decouples transmit parallel clock input and transmit parallel clock output
• Provides Local, Remote Serial, Remote Parallel and Split Loopback modes as well as Loop Timing mode
• Diagnostics features include various lock detect functions and transmit CMU and receive CDR Lock Detect
• Host mode serial microprocessor interface simplifies monitor and control
• Meets Telcordia, ANSI and ITU-T jitter requirements including T1.105.03 - 2002 SONET Jitter Tolerance specification, GR-253 CORE, GR-253 ILR SONET Jitter specifications.
• Operates at 1.8V CMOS and CML with 3.3V I/O
• 490mW Typical Power Dissipation
• Package: 12 x 12 mm 196-pin STBGA
• IEEE 1149.1 Compatable JTAG port

APPLICATIONS
• SONET/SDH-based Transmission Systems
• Add/Drop Multiplexers
• Cross Connect Equipment
• ATM and Multi-Service Switches and Routers
• DSLAMS
• SONET/SDH Test Equipment
• DWDM Termination Equipment