ICS9248YF-153-T Datasheet PDF - Integrated Circuit Systems

General Description
The ICS9248-153 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.
Spread spectrum may be enabled through I2C programming. Spread spectrum typically reduces system EMI by 8dB to 10dB. This simplifies EMI qualification without resorting to board design iterations or costly shielding. The ICS9248-153 employs a proprietary closed loop design, which tightly controls the percentage of spreading over process and temperature variations.
Serial programming I2C interface allows changing functions, stop clock programming and frequency selection.

FEATUREs:
• Up to 150MHz frequency support
• Support power management: CPU, PCI, stop and Power down Mode from I2C programming.
• Spread spectrum for EMI control +/-0.25% center spread
• Uses external 14.318MHz crystal
• FS pins for frequency select

Output Features:
• 3 differential pair open drain CPU clocks (1.5V external pull-up; up to 150MHz achieviable through I2C)
• 2 - AGPCLK @ 3.3V
• 8 - PCI @3.3V, including 1 free running
• 1 - 48MHz @ 3.3V
• 1 - 24/48MHz @ 3.3V
• 2- REF @3.3V, 14.318MHz

Recommended Application:
    AMD-K7 (AMD 750, Irongate Chipset)