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SY87721L Datasheet(PDF) 1 Page - Micrel Semiconductor |
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SY87721L Datasheet(HTML) 1 Page - Micrel Semiconductor |
1 / 15 page SY87721L 1 Micrel, Inc. M9999-072705 hbwhelp@micrel.com or (408) 955-1690 3.3V 28Mbps-2.7Gbps AnyRate® CLOCK AND DATA RECOVERY WITH INTEGRATED CLOCK MULTIPLIER UNIT DESCRIPTION FEATURES SY87721L s Recovers any data and clock from 28Mbps to 2.7Gbps • OC-1, OC-3, OC-12, OC-48, ATM • Gigabit Ethernet, Fast Ethernet • Fibre Channel, 2x Fibre Channel • P1394, Infiniband • SMPTE-259, SMPTE-292 • Proprietary optical transport s Integrated clock multiplier unit with low jitter generation s Complies with Bellcore, ITU/CCITT and ANSI specifications s Selectable mux for pass through; avoids jitter accumulation when switching through backplanes s Available in 64-Pin EPAD-TQFP package The SY87721L is a complete Clock Recovery and Data retiming integrated circuit for data rates from 28Mbps up to 2.7Gbps NRZ including SONET FEC data rates. Included in the device, is a fully integrated Clock Multiplier Unit (CMU) that is capable of generating frequencies that cover the same data rate range as the CDR. The device is ideally suited for SONET/SDH/ATM, Fibre Channel, and Gigabit Ethernet applications, as well as other high-speed data transmission applications. 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 or code group rate source as reference. Rev.: B Amendment: /0 Issue Date: July 2005 SIMPLIFIED BLOCK DIAGRAM SY87721L AnyRate Data In Reference Clock 2 2 2 2 AnyRate Data Out Transmit Clock 2 CDR Recovered Clock CMU APPLICATIONS s SONET/SDH/ATM-based transmission systems, modules, and test equipment s Transponders and section repeaters s Multiplexers: access, add drop (ADM), and terminal (TM) s Terabit routers and broadband cross-connects s Fiber optic test equipment AnyRate is a registered trademark of Micrel, Inc. |
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