ICS9169C-41 Datasheet | Integrated Circuit Systems

.. Integrated Circuit Systems, Inc. Frequency Generator for Pentium Pro™ Based Systems General Description The ICS9169C-41 is a Clock Synthesize/Driver chip for Pentium, Pentium Pro or Cyrix 68x86 based motherboards using SDRAM. Features include four dual purpose I/O pins which provide extra CPU clocks and enable the part to be packaged in a low-cost 34-pin SSOP package. These four pins latch the select inputs at the internal Power-On Reset. Additionally, the device meets the Pentium and Pentium Pro power-up stabilization, which requires that CPU and PCI clocks be stable within 2ms after power-up. The ICS9169C-41 clock outputs are designed for low EMI emissions. Controlled rise and fall times, unique output driver circuits and innovative circuit layout techniques enable the ICS9169C-41 to have lower EMI than other clock devices. The ICS9169C-41 accepts a 14.318MHz reference crystal or clock as its input and runs from a 3.3V supply. Features - - - - - - - - - - - - 12 selectable CPU/SDRAM/AGP clocks up to 75 MHz Six PCI clocks, synchronous or asynchronous mode, pin selectable by Bus Select input (pin 19) One USB clock at 48MHz, meets Intel jitter, accuracy, as well as rise and fall time requirements One I/O clock at 24MHz Two Ref. Clocks at 14.318MHz CPU clocks to PCI clock skew of 1-4ns (CPU early) Low CPU and PCI clock jitter <200ps Low skew outputs, skew window 250ps for CPU clocks and for PCI clocks Improved output drivers are designed for low EMI Test Mode 3.3V ±10% operation Space saving and low cost 34-pin SSOP package Data Shee . Block Diagram Pin Configuration 34-Pin SSOP . 9169-41Rev D 5/02/00 Pentium is a trademark on Intel Corporation. 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...