SM802109 ClockWorks PCI-e Quad 100MHz Ultra-Low Jitter, HCSL Frequency Synthesizer General Description Features The SM802109 is a member of the ClockWorks family of Generates four HCSL clock outputs at 100MHz devices from Micrel and provides an extremely low-noise 2.5V or 3.3V operating range timing solution for PCI-Express clock signals. It is based Typical phase jitter 100MHz on a unique patented RotaryWave architecture that (1.875MHz to 20MHz): 105fs provides very-low phase noise. Industrial temperature range (40 C to +85 C) The device operates from a 3.3V or 2.5V power supply Green, RoHS, and PFOS compliant and synthesizes four HCSL output clocks at 100MHz. The SM802109 accepts a 25MHz crystal or LVCMOS Available in 24-pin 4mm 4mm QFN package reference clock. Data sheets and support documentation can be found on Applications Micrels web site at: www.micrel.com. PCI-Express Block Diagram ClockWorks is a trademark of Micrel, Inc RotaryWave is a registered 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. SM802109 (1) Ordering Information Part Number Marking Shipping Temperature Range Package SM802109UMG 802109 Tube 40C to +85C 24-Pin QFN SM802109UMGTR 802109 Tape and Reel 24-Pin QFN 40C to +85C Note: 1. Devices are Green, RoHS, and PFOS compliant. Pin Configuration 24-Pin QFN (Top View) Pin Description Pin Number Pin Name Pin Type Pin Level Pin Function 16, 17 /Q0, Q0 O, (DIF) HCSL Differential Clock Outputs from Bank 1 100MHz 20, 21 /Q1, Q1 23, 24 /Q2, Q2 O, (DIF) HCSL Differential Clock Outputs from Bank 2 100MHz 3, 4 /Q3, Q3 1 VDDO2 PWR Power Supply for Output Bank 2 2 VSSO2 PWR Power Supply Ground for Output Bank 2 PLL Bypass, Selects Output Source 0 = Normal PLL Operation 5 PLL BYPASS I, (SE) LVCMOS 1 = Output from Input Reference Clock or Crystal 45K pulldown Selects PLL Input Reference Source 6 XTAL SEL I, (SE) LVCMOS 0 = REF IN, 1 = XTAL, 45K pullup September 2011 M9999-092911-B 2 hbwhelp micrel.com or (408) 955-1690