ICS9250-26 Datasheet, PDF (1/15 Pages) Integrated Circuit Systems – Frequency Generator & Integrated Buffers for Celeron & PII/III™

Integrated
Circuit
Systems, Inc.
ICS9250-26
Frequency Generator & Integrated Buffers for Celeron & PII/III™
Recommended Application:
810/810E type chipset. Provides three CPU speeds
(66.6, 100, 133MHz) with SDRAM = 133.3MHz.
Output Features:
• 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
• 2 IOAPIC (2.5V) @ 33.3 MHz
• 2 Hublink clocks (3.3 V) @ 66.6 MHz
• 2 USB (3.3V) @ 48 MHz ( Non spread spectrum)
• 1 REF (3.3V) @ 14.318 MHz
Features:
• Supports spread spectrum modulation ,
down spread 0 to -0.5% and ± 0.25% center spread.
• I²C support for power management
• Efficient power management scheme through PD#
• Uses external 14.138 MHz crystal
• Alternate frequency selections available through I²C
control.
Block Diagram
Pin Configuration
*FS2//REF0
1
VDD0
2
X1
3
X2
4
GND0
5
GND1
6
3V66-0
7
3V66-1
8
VDD1
9
VDD2
10
PCICLK0
11
PCICLK1
12
PCICLK2
13
GND2
14
PCICLK3
15
PCICLK4
16
GND2
17
PCICLK5
18
PCICLK6
19
PCICLK7
20
VDD2
21
VDD3
22
GND3
23
GND4
24
48MHz_0
25
48MHz_1
26
VDD4
27
FS0
28
56
GNDL1
55
IOAPIC0
54
IOAPIC1
53
VDDL1
52
CPUCLK0
51
VDDL0
50
CPUCLK1
49
CPUCLK2
48
GNDL0
47
GND5
46
SDRAM0
45
SDRAM1
44
VDD5
43
SDRAM2
42
SDRAM3
41
GND5
40
SDRAM4
39
SDRAM5
38
VDD5
37
SDRAM6
36
SDRAM7
35
GND5
34
SDRAM_F
33
VDD5
32
PD#
31
SCLK
30
SDATA
29
FS1
56-Pin 300mil SSOP
* This input has a 120KΩ pull-down to GND.
9250-26 Rev B 01/19/01
Third party brands and names are the property of their respective owners.
Functionality
FS2 FS1 FS0
Function
X
0
0 Tristate
X
0
1 Test
0
1
0
Active CPU = 66MHz
SDRAM = 100MHz
0
1
1
Active CPU = 100MHz
SDRAM = 100MHz
1
1
1
Active CPU = 133MHz
SDRAM = 100MHz
(Special Condition)
1
1
0 Active CPU = 133MHz
SDRAM = 133MHz
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.