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