SY87700L

Micrel, Inc. 3.3V 32-175Mbps AnyRate® CLOCK AND DATA RECOVERY SY87700L SY87700L Use lower-power SY87700AL for new designs FEATURES ■ Industrial temperature range (–40°C to +85°C) ■ 3.3V power supply ■ SONET/SDH/ATM compatible ■ Clock and data recovery from 32Mbps up to 175Mbps NRZ data stream, clock generation from 32Mbps to 175Mbps ■ Two on-chip PLLs: one for clock generation and another for clock recovery ■ Selectable reference frequencies ■ Differential PECL high-speed serial I/O ■ Line receiver input: no external buffering needed ■ Link Fault indication ■ 100k ECL compatible I/O ■ Complies with Bellcore, ITU/CCITT and ANSI specifications for applications such as OC-1 and OC-3 as well as proprietary applications ■ Available in 32-pin EPAD-TQFP and 28-pin SOIC packages (28-pin SOIC is available, but is not recommended for new designs.) DESCRIPTION The SY87700L is a complete Clock Recovery and Data Retiming integrated circuit for data rates from 32Mbps up to 175Mbps NRZ. The device is ideally suited for SONET/SDH/ATM applications and other high-speed data transmission systems. Clock recovery and data retiming is performed by synchronizing the on-chip VCO directly to the incoming data stream. The VCO center frequency is controlled by the reference clock frequency and the selected divide ratio. On-chip clock generation is performed through the use of a frequency multiplier PLL with a byte rate source as reference. The SY87700L also includes a link fault detection circuit....