Integrated
Circuit
Systems, Inc.
ICS9250-16
Frequency Generator & Integrated Buffers for Celeron & PII/III™
Recommended Application:
Pin Configuration
810/810E type chipsetꢀ
Output Features:
*FS2//REF0
VDD0
1
2
56
55
54
53
52
51
50
49
48
47
46
45
44
43
42
41
40
39
38
37
36
35
34
33
32
31
30
29
GNDL1
IOAPIC0
IOAPIC1
VDDL1
CPUCLK0
VDDL0
CPUCLK1
CPUCLK2
GNDL0
GND5
SDRAM0
SDRAM1
VDD5
SDRAM2
SDRAM3
GND5
SDRAM4
SDRAM5
VDD5
SDRAM6
SDRAM7
GND5
SDRAM_F
VDD5
PD#
X1
X2
GND0
GND1
3V66-0
3V66-1
VDD1
3
4
5
6
7
8
9
•
3 CPU (2.5V) 66.6/133.3MHz (up to 150MHz
achievable through I2C)
•
9 SDRAM (3.3V) @ 133.3MHz (up to 150MHz
achievable through I2C)
•
•
•
•
•
8 PCI (3.3 V) @33.3MHz
VDD2
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
2 IOAPIC (2.5V) @ 33.3MHz
PCICLK0
PCICLK1
PCICLK2
GND2
PCICLK3
PCICLK4
GND2
PCICLK5
PCICLK6
PCICLK7
VDD2
2 Hublink clocks (3.3 V) @ 66.6MHz
2 USB (3.3V) @ 48MHz ( Non spread spectrum)
1 REF (3.3V) @ 14.318MHz
Features:
•
Supports spread spectrum modulation,
down spread 0 to -0.5% and ± 0.25% center spread.
I2C support for power management
•
•
•
•
VDD3
GND3
GND4
Efficient power management scheme through PD#
Uses external 14.138MHz crystal
Alternate frequency selections available through I2C
control.
48MHz_0
48MHz_1
VDD4
SCLK
SDATA
FS1
FS0
56-Pin 300mil SSOP
* This input has a 50KW pull-down to GNDꢀ
Block Diagram
X1
X2
XTAL
OSC
REF0
PLL1
Spread
Spectrum
Functionality
/2
/3
VDDL
FS2
FS1
FS0
Function
CPU66/100/133 [2:0]
3
2
8
1
8
X
X
0
0
0
1
Tristate
Test
FS(2:0)
PD#
Control
Logic
3V66 [1:0]
SDRAM [7:0]
SDRAM_F
Active CPU = 66MHz
SDRAM = 100MHz
0
0
1
1
1
1
0
1
1
SDATA
SCLK
Active CPU = 100MHz
SDRAM = 100MHz
PCICLK [7:0]
/2
Config
Reg
Active CPU = 133MHz
SDRAM = 100MHz
IOAPIC [1:0]
VDDL
/2
2
(Special Condition)
Active CPU = 133MHz
SDRAM = 133MHz
PLL2
48MHz [1:0]
1
1
0
2
9250-16 Rev H 9/5/00
Third party brands and names are the property of their respective owners.
ICS reserves the right to make changes in the device data identified in
this publication without further notice. ICS advises its customers to
obtain the latest version of all device data to verify that any
information being relied upon by the customer is current and accurate.