ICS9169C-40 Datasheet | Integrated Circuit Systems

.. Integrated Circuit Systems, Inc. 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 Pentium Pro power-up Low CPU and PCI clock jitter <500ps Low skew output Improved output drivers are designed for low EMI Test Mode Optional mon 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 • Data Shee Block Diagram . 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 33.3MHz 36.67MHz REF/4 37.5MHz 25MHz 27.6MHz 30MHz 33.3MHz Functionality 3.3V±10%, 0-70°C Crystal (X1, X2) = 14.31818 MHz 0 1 1 1 1 . Pentium is a trademark on Intel Corporation. 9169C-40Rev A072897P ICS reserves the right to make changes in the device data identified in this publication without further notice. ICS advises its customers to obtain the latest version of all device data to verify that any information being relied upon by the customer is current and accurate. .Data...