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ICS9148F-10 Datasheet

Part NameDescriptionManufacturer
ICS9148F-10 Pentium/Pro™ System Clock Chip ICST
Integrated Circuit Systems ICST
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General Description
The ICS9148-10 is a Clock Synthesizer chip for Pentium and PentiumPro CPU based Desktop/Notebook systems that will provide all necessary clock timing.
Features include four CPU and eight PCI clocks. Three reference outputs are available equal to the crystal frequency. Additionally, the device meets the Pentium power-up stabilization requirement, assuring that CPU and PCI clocks are stable within 2ms after power-up.
PD# pin enables low power mode by stopping crystal OSC and PLL stages. Other power management features include CPU_STOP#, which stops CPU (0:3) clocks, and PCI_STOP#, which stops PCICLK (0:6) clocks.
High drive CPUCLK outputs typically provide greater than 1 V/ns slew rate into 20pF loads. PCICLK outputs typically provide better than 1V/ns slew rate into 30pF loads while maintaining 50–5% duty cycle. The REF clock outputs typically provide better than 0.5V/ns slew rates.
The ICS9148-10 accepts a 14.318MHz reference crystal or clock as its input and runs on a 3.3V core supply.

Features
• Generates system clocks for CPU, IOAPIC, PCI, plus
   14.314 MHz REF (0:2), USB, and Super I/O
• Supports single or dual processor systems
• Supports Spread Spectrum modulation for CPU & PCI
   clocks, down spread -1%
• Skew from CPU (earlier) to PCI clock (rising edges for 100/33.3MHz) 1.5 to 4ns
• Two fixed outputs at 48MHz.
• Separate 2.5V and 3.3V supply pins
• 2.5V or 3.3V output: CPU, IOAPIC
• 3.3V outputs: PCI, REF, 48MHz
• No power supply sequence requirements
• Uses external 14.318MHz crystal, no external load cap
   required for CL=18pF crystal
• 48 pin 300 mil SSOP

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