General Description

The ICS9248-135 is the single chip clock solution for Desktop/Notebook designs using the SIS 540/630 style chipset. It provides all necessary clock signals for such a system.

Features:

• Up to 166MHz frequency support

• Support FS0-FS3 trapping status bit for I2C read back.

• Support power management: CPU, PCI, SDRAM stop and Power down Mode form I2C programming.

• Spread spectrum for EMI control (0 to -0.5, ± 0.25).

• FS0, FS1, FS3 must have a internal 120K pull-Down to GND.

• Uses external 14.318MHz crystal

Output Features:

• 3- CPUs @ 2.5/3.3V, up to 166MHz.

• 10 - SDRAM @ 3.3V, up to 166MHz including 2 SDRAM_Fs

• 7- PCI @3.3V,

• 1- 48MHz, @3.3V fixed.

• 1- 24/48MHz, @3.3V selectable by I2C (Default is 24MHz).

• 2- REF @3.3V, 14.318MHz.

Recommended Application:

Motherboard Single chip clock solution for SIS540, SIS630 Pentium II/III and K6 chipsets.