ICS950104AFT - Programmable System Clock Chip for PIII Processor

Recommended Application:

SIS630ST style chipset

Output Features:

• 1 - CPU clocks @ 2.5V

• 1 - Pair of differential CPU clocks @ 3.3V

• 9 - SDRAM @ 3.3V

• 7 - PCI @3.3V

• 1 - 48MHz, @3.3V

• 1 - 24/48MHz @ 3.3V

• 3 - REF @3.3V, (selectable strength) through I2

C

Features:

• Programmable ouput frequency

• Programmable ouput rise/fall time

• Programmable CPU, SDRAM, and PCI skew

• Real time system reset output

• Spread spectrum for EMI control typically

by 7dB to 8dB, with programmable spread percentage

• Watchdog timer technology to reset system

if over-clocking causes malfunction

• Uses external 14.318MHz crystal

Skew Specifications:

• CPU - CPU: <250ps

• PCI - PCI: <500ps

• SDRAM - SDRAM: <250ps

• CPU - SDRAM:<350ps

• CPU - PCI: <3ns 

General Description

The ICS950104 is a main clock synthesizer chip for PIII based systems with ALI 1651 style chipset. This provides all clocks

required for such a system.

The ICS950104 belongs to ICS new generation of programmable system clock generators. It employs serial programming I2

C

interface as a vehicle for changing output functions, changing output frequency, configuring output strength, configuring

output to output skew, changing spread spectrum amount, changing group divider ratio and dis/enabling individual clocks.

This device also has ICS propriety 'Watchdog Timer' technology which will reset the frequency to a safe setting if the system

become unstable from over clocking

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