Functional Description
The CYS25G0101DX SONET OC-48 Transceiver is a communications building block for high speed SONET data communications. It provides complete parallel-to-serial and serial-to-parallel conversion, clock generation, and clock and data recovery operations in a single chip optimized for full SONET compliance.

FEATUREs
■ SONET OC-48 operation
■ Bellcore and ITU jitter compliance
■ 2.488 GBaud serial signaling rate
■ Multiple selectable loopback or loop through modes
■ Single 155.52 MHz reference clock
■ Transmit FIFO for flexible data interface clocking
■ 16-bit parallel-to-serial conversion in transmit path
■ Serial-to-16-bit parallel conversion in receive path
■ Synchronous parallel interface
   ❐ LVPECL compliant
   ❐ HSTL compliant
■ Internal transmit and receive phase-locked loops (PLLs)
■ Differential CML serial input
   ❐ 50 mV input sensitivity
   ❐ 100Ωinternal termination and DC restoration
■ Differential CML serial output
   ❐ Source matched for 50Ωtransmission lines (100 Ω differential
      transmission lines)
■ Direct interface to standard fiber optic modules
■ Less than 1.0W typical power
■ 120-pin 14 mm × 14 mm TQFP
■ Standby power saving mode for inactive loops
■ 0.25μ BiCMOS technology
■ Pb-free packages available