ICS9248-65

Integrated Circuit Systems, Inc. ICS9248-65 Frequency Timing Generator for PENTIUM II™Systems Features • Generates the following system clocks: - 3 CPU clocks ( 2.5V, 100/133MHz) - 10 PCI clocks, including 1 free-running (3.3V, 33.3MHz) - 1 CPU/2 clocks (2.5V, 50/66.6MHz) - 1 IOAPIC clocks (2.5V, 16.67MHz) - 3 Fixed frequency 66MHz clocks(3.3V, 66.6MHz) - 2 REF clocks(3.3V, 14.318MHz) - 1 USB clock (3.3V, 48MHz) Efficient power management through PD#. 0 to -0.5% typical down spread modulation on CPU, PCI, IOAPIC, 3V66 and CPU/2 output clocks. Uses external 14.318MHz crystal. Key Specification • • • • • • • • • • • • CPU Output Jitter: <250ps CPU/2 Output Jitter. <250ps IOAPIC Output Jitter: <500ps 48MHz, 3V66, PCI Output Jitter: <500ps PCI Output Jitter. <500ps Ref Output Jitter. <1000ps CPU 0:2 Output Skew: <175ps PCI_F, PCI 1:7 Output Skew: <500ps 3V66_0:2 Output Skew <250ps CPU to 3V66_0:2 Output Offset: 0.0 - 1.5ns (CPU leads) 3V66 to PCI Output Offset: 1.5 - 4ns (CPU leads) CPU to IOAPIC Output Offset 1.5 - 4.0ns (CPU leads) • • • Block Diagram Pin Configuration 48-pin SSOP Third party brands and names are the property of their respective owners. 9248-65 Rev C 7/28/99 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. ICS9248-65 General De...