SM843256 10 Gigabit Ethernet and SONET, 6 output, Ultra-Low Jitter LVPECL Frequency Synthesizer General Description Features The SM843256 provides a low-noise timing solution for Generates six LVPECL outputs high speed, high accuracy synthesis of clock signals. 2.5V or 3.3V operating range Common applications include SONET, Gigabit Ethernet, Typical phase jitter 156.25MHz 10 Gigabit Ethernet, and similar networking standards. It (1.875MHz to 20MHz): 80fs (typical) 3.3V includes a unique power reduction methodology, along TM 75MHz to 625MHz output frequencies with a patented RotaryWave architecture that provides a very stable clock with very low noise. Industrial temperature range Power supplies of either 3.3V or 2.5V are supported, with Green, RoHS, and PFOS compliant superior jitter and phase noise performance. The device Available in 24-pin TSSOP EPAD synthesizes different low noise LVPECL output Operating supply modes: frequencies such as 125MHz, 156.25MHz, 312.5MHz, and Core/Output 625MHz for Ethernet applications 77.76MHz, 155.52MHz, 3.3V/3.3V, 3.3V/2.5V, 2.5V/2.5V 311.04MHz, and 622.08MHz for SONET applications. The crystal reference frequencies used include 25MHz and 19.44Mhz for Ethernet and SONET applications, Applications respectively. SONET The SM843256 is an excellent replacement for IDT Femto- clocks, with improved accuracy, power consumption, Gigabit Ethernet waveform integrity, and jitter. 10-Gigabit Ethernet Data sheets and support documentation can be found on Infiniband Micrels web site at: www.micrel.com. Block Diagram RotaryWave is a trademark of Multigig, Inc. Micrel Inc. 2180 Fortune Drive San Jose, CA 95131 USA tel +1 (408) 944-0800 fax + 1 (408) 474-1000 Micrel, Inc. SM843256 (1, 2) Ordering Information Part Number Marking Shipping Junction Temperature Range Package SM843256KA 843256 Tube, Tape & Reel 40 to +85C 24-Pin TSSOP EPAD Notes: 1. Devices are Green, RoHS, and PFOS Compliant. 2. Lead finish is 100% matte tin. Pin Configuration 24-Pin TSSOP EPAD (Top View) July 2010 2 M9999-072110-B