ICS9169C-40

www.DataSheet4U.com Integrated Circuit Systems, Inc. ICS9169C-40 System Clock Chip General Description The ICS9169C-40 is a Clock Synthesizer chip for Pentium or Cyrix CPU based motherboards using PCI. Features include eight CPU clocks and six PCI clocks. A Reference Output is available equal to the crystal frequency. The device meets the Pentium power-up stabilization, which requires that CPU and PCI clocks be stable within 2ms after power-up. The ICS9169C-40 clock output are designed for low EMI emissions. Controlled rise and fall times, unique output driver circuits and innovative circuit layout techniques enable the ICS9169C-40 to have lower EMI than other clock devices. The ICS9169C-40 accepts a 14.318MHz reference crystal or clock as its input and runs from a 3.3V supply. Features • • • • • • • • • 8 selectable CPU clocks up to 75MHz Six synchronous PCI clocks One Referance Clock at 14.318MHz Power-up stabilization time = 2ms on all CPU and PCI clocks, which meets Intel PentiumPro power-up Low CPU and PCI clock jitter <500ps Low skew output Improved output drivers are designed for low EMI Test Mode Optional common or mixed supply mode: (VDD = VDDL1 =VDDL2 = 3.3V) (VDD = 3.3V, VDDL1=VDDL2 = 2.5) (VDD = 3.3V, VDDL1 = 3.3V, VDDL2 = 2.5V) Space saving and low cost 34-pin SSOP package • DataShee Block Diagram DataSheet4U.com Pin Configuration 34-Pin SSOP FS2 0 0 0 FS1 0 0 1 1 0 0 1 1 FS0 0 1 0 1 0 1 0 1 CPU 50MHz 55MHz REF/2 75MHz 50MHz 55MHz 60MHz 66.6MHz PCI 33.3...