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General Description

The ICS9148-12 is a Clock Synthesizer chip for Pentium and PentiumPro CPU based Desktop/Notebook systems that will provide all necessary clock timing.

Features

? CPU outputs are stronger drive for multiple loads per pin (ie CPU and NB on one pin)

? 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 and 240 mil TSSOP

? Output enable register

for serial port control: 1 = enable

0 = disable