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ICS951412 Datasheet(PDF) 4 Page - Integrated Circuit Systems

Part No. ICS951412
Description  System Clock Chip for ATI RS480 K8-based Systems
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Maker  ICST [Integrated Circuit Systems]
Homepage  http://www.icst.com
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ICS951412 Datasheet(HTML) 4 Page - Integrated Circuit Systems

 
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ICS951412
0883G—12/08/04
General Description
The ICS951412 is a main clock synthesizer chip that provides all clocks required for ATI RS480-based systems.
An SMBus interface allows full control of the device.
Skew Characteristics
Parameter
Description
Test Conditons
Skew
Window
Unit
Tsk_CPU_CPU
measured at x-ing of CPU,
250
ps
Tsk_CPU_PCI
measured at x-ing of CPU,
1.5V of PCI clock
2000
ps
Tsk_PCI_PCI
measured between rising
edge at 1.5V
500
ps
Tsk_PCI33-HT66
measured between rising
edge at 1.5V
500
ps
Tsk_CPU_HT66
measured between rising
edge at 1.5V
2000
ps
Tsk_CPU_HT66
measured at x-ing of CPU,
1.5V of PCI clock
500
ps
Tsk_CPU_CPU
measured at x-ing of CPU,
200
ps
Tsk_CPU_PCI
measured at x-ing of CPU,
1.5V of PCI clock
200
ps
Tsk_PCI_PCI
measured between rising
edge at 1.5V
200
ps
Tsk_PCI33-HT66
measured between rising
edge at 1.5V
200
ps
Tsk_CPU_HT66
measured between rising
edge at 1.5V
200
ps
Tsk_CPU_HT66
measured at x-ing of CPU,
1.5V of PCI clock
200
ps
time independent
skew
not dependent on
V, T changes
time variant skew
varies over
V, T changes
Block Diagram
MAIN PLL
PCICLK0
CONTROL
LOGIC
XTAL
OSC.
CPUCLK8(1:0)
FIXED PLL
USB_48MHz
DIVIDER
DIVIDERS
REF(2:0)
HTTCLK0
SRCCLK(7:3,0)
CLKREQA#
SDATA
SCLK
FS(2:0)
CLKREQB#
SEL75#/100
X1
X2
IREF
ATIGCLK(1:0)


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