General Description
The VSC8111 is an ATM/SONET/SDH compatible transceiver integrating an on-chip clock multiplication unit (PLL) for the high speed clock and 8 bit serial-to-parallel and parallel-to-serial data conversion. The high speed clock generated by the on-chip PLL is selectable for 155.52 or 622.08 MHz operation. The demultiplexer contains SONET/SDH frame detection and recovery. In addition, the device provides both facility and equipment loopback modes and two loop timing modes. The part is packaged in a 100 PQFP with an integrated heat spreader for optimum thermal performance and reduced cost. The VSC8111 provides an integrated solution for ATM physical layers and SONET/SDH systems applications
   
Features
• Loss of Signal (LOS) Control
• Provides Equipment, Facilities and Split
    Loopback Modes as well as Loop Timing Mode
• Meets Bellcore, ITU and ANSI Specifications for
    Jitter Performance
• Single 3.3V Supply Voltage
• Low Power - 1.4 Watts Maximum
• 100 PQFP Package
• Operates at Either STS-3/STM-1 (155.52 Mb/s) or
    STS-12/STM-4 (622.08 Mb/s) Data Rates
• Compatible with Industry ATM UNI Devices
• On Chip Clock Generation of the 155.52 Mhz
    or 622.08 Mhz High Speed Clock
• Dual 8 Bit Parallel TTL Interface
• SONET/SDH Frame Detection and Recovery