CYS25G0101DX

CYS25G0101DX SONET OC-48 Transceiver SONET OC-48 Transceiver 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 ❐ 100internal termination and DC restoration ■ Differential CML serial output ❐ Source matched for 50 transmission lines (100  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 ■ 0.25 BiCMOS technology ■ Pb-free packages available 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. Transmit Path New data is accepted at the 16-bit parallel transmit interface at a rate of 155.52 MHz. This data is passed to a small integrated FIFO to enable flexible transfer of data betw...