SY87739L Protocol Transparent, 3.3V, 10MHz to 729MHz, Fractional-N Synthesizer General Description Features The SY87739L is a complete rate independent frequency Protocol transparent fractional-N synthesizer from synthesizer integrated circuit. From a single reference 10MHz to 729MHz from a single 27MHz reference source, this device generates a differential PECL output oscillator frequency from 10MHz up to 729MHz Generates exactly the correct frequency for common The SY87739L generates an exactly correct reference transport protocols with or without FEC frequency for common data transport protocols. This is Directly enables SY87721L CDR to lock onto any data especially important in transponder applications, where a rate within its range standards compliant protocol data unit must be generated Exceeds BellCore and ITU jitter generation downstream, even in the absence of any signal from the specifications associated upstream interface. In addition, the SY87739L Programmable via MicroWire interface will generate exactly correct reference frequencies for common data transport protocols augmented by forward Available in 32-Pin ePad-TQFP package error correction codes. The SY87739L accepts configuration via a MicroWire interface Applications For proprietary applications, the SY87739L generates reference frequencies guaranteed to enable the SY87721L Metro access system CDR to lock to any possible baud rate from 28Mbps to Transponders 2.7Gbps. Bullet item Data sheets and support documentation can be found on Multiplexers: access, Add Drop Mux Micrels web site at: www.micrel.com. SONET/SDH/ATM-based transmission systems, modules and test equipment Broadband cross-connects Fiber optic test equipment Protocols supported: OC-1, OC-3, OC-12, OC-48, ATM, Gigabit Ethernet, Fast Ethernet, Fibre Channel and 2X Fibre Channel, 1394, InfiniBand, and Proprietary Optical Transport Typical Application Circuit and Typical Performance AnyClock and AnyRate are registered trademarks of Micrel, Inc. MicroWire is a trademark of National Semiconductor Micrel Inc. 2180 Fortune Drive San Jose, CA 95131 USA tel +1 (408) 944-0800 fax + 1 (408) 474-1000 Micrel, Inc. SY87739L Ordering Information Part Number Package Type Operating Range Package Marking Lead Finish SY87739LHI H32-2 Industrial SY87739LHI Sn-Pb (2) SY87739LHITR H32-2 Industrial SY87739LHI Sn-Pb Matte-Sn SY87739LHY H32-2 Industrial SY87739LHY with Pb-Free Bar Line Indicator Pb-Free Matte-Sn (2, 3) SY87739LHYTR H32-2 Industrial SY87739LHY with Pb-Free Bar Line Indicator Pb-Free Notes: 1. Contact factory for die availability. Dice are guaranteed at T = 25 C, DC electricals only. A 2. Tape and Reel. 3. Pb-Free package is recommended for new designs. Pin Configuration ePad TQFP (H32-2) Pin Description Pin Number Pin Name Pin Function 1, 24 VCCA Analog Supply (Power). Set to same voltage as VCC. 2, 5, 11, 12, 13, 15, 16, NC No Connect. These pins are to be left unconnected. 19, 20, 23, 28, 29 Reference Clock Input (Differential PECL Input): This is a clock derived from an oscillator or other sufficiently accurate frequency source. The frequency provided at this input determines, along with 3, 4 REFCLK the programming, the output frequency at REFOUT . Micrel recommends using a 27.000MHz frequency source. Program Interface Chip Select (TTL Input): This signal forms part of the MicroWire interface. When 6 PROGCS active high, this signal permits the acquisition of serial data. A falling edge on this input causes SY87739L to re-acquire lock to a new frequency, based on the program downloaded to it. June 2011 2 M9999-061511 hbwhelp micrel.com or (408) 955-1690