integrated circuit systems, inc. ICS9FG110 advance information 0872?12/11/03 pin configuration recommended application: frequency timing generator for differential pci-express clocks features: generates common pci-express frequencies from reference input clock (33.33mhz) 7 - 0.7v current-mode differential output pairs three spread spectrum modes: spread tracking mode, 0 to -0.5 downspread and +/-0.25% centerspread support for m/n programming programmable spread percentage programmable output divider smbus address is dc/dd key specifications: output cycle-to-cycle jitter < 85 ps output to output skew < 85 ps +/-300 ppm frequency accuracy on output clocks programmable ftg for differential pci-express advance information documents contain information on products in the formative or design phase development. characteristic data and other specific ations are design goals. ics reserves the right to change or discontinue these products without notice. third party brands and names are the property of their respective owners. power groups refin 1 28 vdda sdata 2 27 gnda sclk 3 26 iref *pd# 425 mode_sel** pciext0 5 24 pciext6 pciexc0 6 23 pciexc6 vddpciex 722 vddpciex gnd 8 21 gnd pciext1 9 20 pciext5 pciexc1 10 19 pciexc5 pciext2 11 18 pciext4 pciexc2 12 17 pciexc4 pciext3 13 16 vddpciex pciexc314 15gnd 28-ssop/tssop ICS9FG110 ** this pin have 120k pull-down to gnd * this pin have 120k pull-up to vdd vdd gnd 28 27 analog pow er & gnd f or cpu core 7, 22 8, 15, 21 po w e r & gnd f o r pci ex p r e s s clo c k outputs pin number description block diagram i ref programmable spread pll1 programmable frequency dividers refin sdata sclk mode_sel control logic pciexc (6:0) pciext (6:0) functionality table spread spectrum % spread tracking input +/- 0.25 center spread mode_sel pciex freq 0 1 100 100
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