General Description

The ICS9248-61 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.

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

  - 2 REF clks Fixed (3.3V) 48MHz at 14.318MHz.

Skew characteristics:

   - CPU – CPU<175ps

   - PCI – PCI < 250ps

   - PCI_E (early) – PCI = 2.1ns

   - 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.