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ICS9250-09 Datasheet(PDF) 1 Page - Integrated Circuit Systems |
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ICS9250-09 Datasheet(HTML) 1 Page - Integrated Circuit Systems |
1 / 12 page General Description Features ICS9250-09 Integrated Circuit Systems, Inc. Block Diagram Frequency Timing Generator for PENTIUM II Systems 9250-09 Rev J 1/21/00 Pin Configuration 56-pin SSOP Generates the following system clocks: - 4CPUclocks(2.5V,100/133MHz) - 8 PCI clocks, including 1 free-running (3.3V, 33MHz) - 2CPU/2clocks(2.5V,50/66MHz) - 3IOAPICclocks(2.5V,16.67MHz) - 4 Fixed frequency 66MHz clocks(3.3V, 66MHz) -2REFclocks(3.3V,14.318MHz) - 1USBclock(3.3V,48MHz) Efficient power management through PD#, CPU_STOP# and PCI_STOP#. 0.5% typical down spread modulation on CPU, PCI, IOAPIC, 3V66 and CPU/2 output clocks. Usesexternal14.318MHzcrystal. The ICS9250-09 is a main clock synthesizer chip for Pentium II based systems using Rambus Interface DRAMs. This chip provides all the clocks required for such a system when used with a Direct Rambus Clock Generator(DRCG) chip such as the ICS9211-01. Spread Spectrum may be enabled by driving the SPREAD# pin active. Spread spectrum typically reduces system EMI by 8dB to 10dB. This simplifies EMI qualification without resorting to board design iterations or costly shielding. The ICS9250-09 employs a proprietary closed loop design, which tightly controls the percentage of spreading over process and temperature variations. The CPU/2 clocks are inputs to the DRCG. Key Specification CPU Output Jitter: <250ps CPU/2 Output Jitter. <250ps IOAPIC Output Jitter: <500ps 48MHz, 3V66, PCI Output Jitter: <500ps Ref Output Jitter. <1000ps CPU Output Skew: <175ps CPU/2 Output Skew. <175ps IOAPIC Output Skew <250ps PCI Output Skew: <500ps 3V66 Output Skew <250ps CPU to 3V66 Output Offset: 0.0 - 1.5ns (CPU leads) 3V66 to PCI Output Offset: 1.5 - 4.0ns (3V66 leads) CPU to IOAPIC Output Offset 1.5 - 4.0ns (CPU leads) 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. |
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