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ICS9148-02 Datasheet

Part NameDescriptionManufacturer
ICS9148-02 Pentium/Pro™ System Clock Chip ICST
Integrated Circuit Systems ICST
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General Description
The ICS9148-02 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, seven PCI and eight SDRAM clocks. Two reference outputs are available equal to the crystal frequency. Additionally, the device meets the Pentium power-up stabilization, which requires that CPU and PCI clocks be stable within 2ms after power-up.

Features
• Generates system clocks for CPU, IOAPIC, SDRAM,
   PCI, plus 14.314 MHz REF(0:1), USB, Plus Super I/O
• Supports single or dual processor systems
• I2C serial configuration interface provides output clock
   disabling and other functions
• MODE input pin selects optional power management input control pins
• Two fixed outputs separately selectable as 24 or 48MHz
• Separate 2.5V and 3.3V supply pins
• 2.5V or 3.3V outputs: CPU, IOAPIC
• 3.3V outputs: SDRAM, PCI, REF, 48/24 MHz
• CPU 3.3_2.5# logic pin to adjust output strength
• No power supply sequence requirements
• Uses external 14.318MHz crystal
• 48 pin 300 mil SSOP
• Output enable register
   for serial port control:
      1 = enable
      0 = disable

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