General Description

The ICS9248-56 is the Main clock solution for Notebook designs using the Intel 440BX style chipset. Along with an SDRAM buffer such as the ICS9179-03, it provides all necessary clock signals for such a system.

Features

• Generates the following system clocks:

- 2CPU(2.5V) up to 100MHz.

- 6 PCI(3.3V) @ 33.3MHz (Includes one free running).

- 1 REF clks (3.3V) at 14.318MHz.

- 1 Fixed clock at 48MHz

- 1 Fixed clock at 48 or 24MHz

• Skew characteristics:

- CPU – CPU<175ps

- PCI – PCI < 500ps

- CPU(early) – PCI = 1.5ns – 4ns.

• Supports Spread Spectrum modulation for CPU and PCI clocks, 0.5 down spread

• Efficient Power management scheme through stop clocks and power down modes.

• Uses external 14.318MHz crystal, no external load cap required for CL=18pF crystal.

• 28 pin 209mil SSOP and 173mil TSSOP