SY87725LHY Microchip

SY87725L 2.5Gbps GPON/BPON ONU SERDES General Description Features The SY87725L is a single chip transceiver for data rates Single 3.3V supply and 1W typ. power consumption up to 2.5Gbps. On the receive side, it includes a 2.5G/1.25G/625Mbps down stream complete clock recovery and data retiming circuit with 1.25G/625M/156Mbps up stream an integrated 4-bit serial-to-parallel data converter. On 4-bit Serdes with LVDS interfaces the transmit side, it includes a synthesizer with an Serial Data input sensitivity of 30mV typical integrated 4-bit parallel-to-serial data converter. Training mode for fast lock acquisition The SY87725L receiver has a synthesizer that Link Fault Indicator (LFIN: HIGH = Locked) generates an internal clock from an externally supplied TTL or PECL REFCLK that can be either 155.52MHz or Separate training and MUX synthesizers 77.76MHz. This internal clock can be used by the clock Loop back function for diagnostics recovery PLL if an absence of transitions on the input TTLCML Translator for MAC-to-Laser diode driver serial data stream prevents normal clock recovery. This burst control enables it to provide a stable clock source in the Selectable double data rate option for low cost absence of transitions on the incoming serial data FPGA/ASIC MAC implementation stream. Available in Pb-Free (10mm x 10mm) 64-pin The transmit synthesizer uses the CLKIN parallel data EPAD-TQFP clock to generate its own serial rate clock locked to CLKIN. This enables the transmit and receive to operate Applications at different data rates. BPON/GPON/GEPON/EPON The serial interface for both the transmit and receive functions feature industry standard high-speed Markets differential CML I/O. The parallel interfaces feature high- speed LVDS I/O with an internal 100 termination on FTTH/FTTP the LVDS inputs. The first bit for the serial-to-parallel conversion can be moved using the RCV SYNC input. The RCV SYNC input enables the parallel word boundary to move up in time by one bit time for each pulse. This allows it to in effect swallow one bit each time the RCV SYNC pulse is asserted. Datasheets and support documentation can be found on Micrels web site at: www.micrel.com. Micrel Inc. 2180 Fortune Drive San Jose, CA 95131 USA tel +1 (408) 944-0800 fax + 1 (408) 474-1000 Micrel, Inc. SY87725L Functional Block Diagram 2 M9999-071007-B July 2007 hbwhelp micrel.com or (408) 955-1690