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ICS952906A Datasheet(PDF) 3 Page - Integrated Circuit Systems

Part No. ICS952906A
Description  Programmable Timing Control Hub for Next Gen P4™ processor
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Maker  ICST [Integrated Circuit Systems]
Homepage  http://www.icst.com
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ICS952906A Datasheet(HTML) 3 Page - Integrated Circuit Systems

 
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3
Integrated
Circuit
Systems, Inc.
ICS952906A
1236A—08/06/07
ICS952906A is a 48 pin clock chip for VIA VN800/CN700/P4M800 style chipsets. When used with a fanout DDR buffer, such
as the 93788, it provides all the necessary clock signals for such a system.
The ICS952906A is part of a whole new line of ICS clock generators and buffers called TCH™ (Timing Control Hub). This part
incorporates ICS's newest clock technology which offers more robust features and functionality. Employing the use of a
serially programmable I
2C interface, this device can adjust the output clocks by configuring the frequency setting, the output
divider ratios, selecting the ideal spread percentage, the output skew, the output strength, and enabling/disabling each
individual output clock. M/N control can configure output frequency with resolution up to 0.1MHz increment.
General Description
Block Diagram
I REF
RESET#
PLL2
Frequency
Dividers
Programmable
Spread
PLL1
Programmable
Frequency
Dividers
STOP
Logic
48MHz
24_48MHz
X1
X2
XTAL
SDATA
SCLK
PCI_STOP#
CPU_STOP#
VTTPWRGD#/PD#
FS (4:0)
Sel24_48#
MODE
Control
Logic
REF (1:0)
CPUCLKT (1:0)/ITP
CPUCLKC (1:0)/ITP
25MHz (1:0)
3V66 (2:0)
PCICLK (6:0)
PCICLK_F (2:0)
Power Groups
VDD
GND
3
6
REF, Xtal
10, 17
11, 18
PCICLK outputs
24
23
48MHz Fix, Fix Digital, Fix analog
27
28
3V66 outputs
34
37
2.5V for 25MHz outputs
40
43
CPU outputs
48
47
CPU Analog, CPU digital
Description
Pin Number


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