ICS950104 Datasheet, PDF (3/19 Pages) Integrated Circuit Systems – Programmable System Clock Chip for PIII Processor

ICS950104
Advance Information
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 I²C
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.
MULTISEL0
Board Target
Trace/Term Z
0
50 ohms
1
50 ohms
Reference R,
Iref =
V /(3*Rr)
DD
Rr = 221 1%,
Iref = 5.00mA
Rr = 475 1%,
Iref = 2.32mA
Output
Current
Voh @ Z
Ioh = 4* I REF 1.0V @ 50
Ioh = 6* I REF 0.7V @ 50
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