General Description

The ICS9248-64 is a main clock synthesizer chip for AMD-K7 based systems. This provides all clocks required for such a system when used with a Zero Delay Buffer Chip such as the ICS9179-06.

Features

• Generates the following system clocks:

- 3 differential pair open drain CPU clocks (1.5V external pull-up; up to 133MHz).

- 8 PCI including 1 free running (3.3V) @33.3MHz.

- 2 AGP(3.3V) up to 66.6MHz.

- 2 REF(3.3V)@14.318MHz

- 1 48MHz(3.3V)

- 24 / 48MHz(3.3V)

• Skew characteristics:

- CPU -CPU<250ps

- CPUt - CPUc <200ps (differential pair)

- PCI – PCI: <500ps

- CPU – SDRAM_OUT: < 250ps

- CPU – AGP <500ps

• Efficient Power Management through PD#, PCI_STOP# and CPU_STOP#.

• Spread Spectrum option for EMI reduction (-1.0 down spread).

• Uses external 14.318 MHz crystal