ICS9248- 81
Frequency Generator & Integrated Buffers
General Description
The ICS9248-81 is the single chip clock solution for Desktop/
Notebook designs using the SIS style chipset. It provides all
necessary clock signals for such a system.
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 ICS9248-81
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. The SD_SEL
latched input allows the SDRAM frequency to follow the
CPUCLK frequency(SD_SEL=1) or other clock frequencies
(SD_SEL=0)
Block Diagram
Features
Generates the following system clocks:
- 3 CPU(2.5V/3.3V) up to 133.3MHz.
- 6 PCI(3.3V) (including 1 free-running)
- 13 SDRAMs(3.3V) up to 133.3MHz.
- 3 REF (3.3V) @ 14.318MHz
- 1 clock @ 24/14.3 MHz selectable output for SIO
- 1 Fixed clock at 48MHz (3.3V)
- 1 IOAPIC @ 2.5V / 3.3V
Skew characteristics:
- CPU CPU
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