SM844256 Product Brief 10 Gigabit Ethernet and SONET, High-Performance LVDS Frequency Synthesizer Description and 622.08MHz for SONET applications. The crystal The SM844256 provides a low-noise timing solution for reference frequencies used include 25MHz and 19.44Mhz high speed, high accuracy synthesis of clock signals. for Ethernet and SONET applications, respectively. Common applications include SONET, Gigabit Ethernet, 10 Gigabit Ethernet, and similar networking standards. The SM844256 is an excellent replacement for IDT Femtoclocks, with improved accuracy, power consumption, Power supplies of either 3.3V or 2.5V are supported, with waveform integrity, and jitter. superior jitter and phase noise performance. The device synthesizes different low noise LVDS output frequencies Datasheets and support documentation can be found on such as 125MHz, 156.25MHz, 312.5MHz, and 625MHz for Micrel’s web site at: www.micrel.com. Ethernet applications; 77.76MHz, 155.52MHz, 311.04MHz, ____________________________________________________________________________________________________________ Block Diagram Micrel, Inc. TEL: +1 408.944.0800 FAX: + 1 408.474.1000 http://www.micrel.com Features Benefits Generates six LVDS outputs Can drive multiple devices in need of a low-noise clock for various applications, which include Gigabit Ethernet and SONET applications 2.5V or 3.3V operating range Provides interface flexibility Typical phase jitter @ 125MHz – (1.875MHz to 20MHz): 80 fs (typical) @ 3.3V Provides superior performance with multiple low phase noise clock outputs that exceed jitter requirements for various applications 75MHz to 625MHz output frequencies Supports a wide range of clock frequencies that include Gigabit Ethernet and SONET standard frequencies for various applications Available in 24-pin TSSOP EPAD EPAD provides improved power dissipation Operating supply modes: – Core/Output – 3.3V/3.3V, 3.3V/2.5V Provides interface flexibility Applications • SONET • Gigabit Ethernet • 10-Gigabit Ethernet • Infiniband Corporate Sales Offices Location Address Telephone Fax Corporate HQ 2180 Fortune Dr. Western USA 2180 Fortune Dr. San Jose, CA 95131 USA (408) 944-0800 (408) 474-1000 San Jose, CA 95131 USA (408) 944-0800 (408) 474-1000 Central USA Eastern USA 2425 N. Central Expressway, Suite 351 Richardson, TX 57080 USA (972) 393-2533 (408) 474-1210 93 Branch St. Medford, NJ 08055 USA (609) 654-0078 (609) 654-0989 Latin America 2425 N. Central Expressway, Suite 351 Richardson, TX 57080 USA (972) 393-2533 (408) 474-1210 China No. 2001 & 2002, 20/F, Excellence Times Plaza 4068 Yitian Rd., Futian District Rd. Shenzhen 518048, P.R. China +86-755-8302-7618 +86-755-8302-7637 Japan Queen’s Tower A 14F, 2-3-1, Minato Mirai, Nishi-Ku, Yokohama-Shi Kanagawa 220-6014, Japan +81-45-224-6616 +81-45-224-6716 Korea 4F Manzo 2 Bldg, 198-47, Gungnae-Dong, Bundang-Ku Seongnam-City, Kyungki-do, 463-470, Korea 82 (2) 538-2380 82 (2) 538-2381 Singapore/India 7500A Beach Rd., #07-324 The Plaza Singapore 199591 +65-6291-1318 +65-6291-1332 Taiwan 4F, No. 43 Lane 188, Rueiguang Rd., Neihu District Taipei, Taiwan, R.O.C. +866 (2) 8751-0600 +866 (2) 8751-0746 France/ Southern Europe Les Laurentides Immeuble Ontario, 3 avenue du Quebec 91140 Villebon sur Yvette, France +33 (0) 1.6092.4190 +33 (0) 1.6092.4189 UK/EMEA 1st Floor, 3 Lockside Place, Mill Lane, Newbury, Berks United Kingdom RG14 5QS +44 (1635) 524455` +44 (1635) 524466 Micrel, Inc. TEL: +1 408.944.0800 FAX: + 1 408.474.1000 http://www.micrel.com M9999-070810