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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