General Description

The ICS9250-22 is a single chip clock solution.

Spread spectrum typically reduces system EMI by 8dB to 10dB. This simplifies EMI qualification without resorting to board design iterations or costly shielding. The ICS9250-22 employs a proprietary closed loop design, which tightly controls the percentage of spreading over process and temperature variations.

Features:

• Support power management: Power Down Mode

• Supports Spread Spectrum modulation: 0 to -0.5% down spread.

• Uses external 14.318MHz crystal

• Select logic for Differential Swing Control, Test mode, Tristate, Power down, Spread Spectrum, limited frequency select, selective clock enable.

• External resistor for current reference

• FS pins for frequency select

Output Features:

• 4 Differential CPU Clock Pairs @ 3.3V

• 2 - 3V MREF clocks for memory reference seeds, (separate single ended but 180 degrees out of phase)

• 4 - 66MHz reference output

• 10 - 3V 33MHz PCI clocks

• 2 - 48MHz clocks

• 2 - 14.318 reference output

Recommended Application:

  P IV Chipset Support