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ICS9250YF-26-T Datasheet

  • ICS9250YF-26-T

  • Frequency Generator & Integrated Buffers for Celeron & PII/I...

  • 15頁(yè)

  • ICS

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Integrated
Circuit
Systems, Inc.
ICS9250-26
Frequency Generator & Integrated Buffers for Celeron & PII/III鈩?/div>
Recommended Application:
810/810E type chipset. Provides three CPU speeds
(66.6, 100, 133MHz) with SDRAM = 133.3MHz.
Output Features:
鈥?/div>
3 CPU (2.5V) 66.6/133.3MHz (up to 150MHz
achievable through I
2
C)
鈥?/div>
9 SDRAM (3.3V) @ 133.3MHz (up to 150MHz
achievable through I
2
C)
鈥?/div>
8 PCI (3.3 V) @33.3MHz
鈥?/div>
2 IOAPIC (2.5V) @ 33.3 MHz
鈥?/div>
2 Hublink clocks (3.3 V) @ 66.6 MHz
鈥?/div>
2 USB (3.3V) @ 48 MHz ( Non spread spectrum)
鈥?/div>
1 REF (3.3V) @ 14.318 MHz
Features:
鈥?/div>
Supports spread spectrum modulation ,
down spread 0 to -0.5% and 鹵 0.25% center spread.
鈥?/div>
I
2
C support for power management
鈥?/div>
Efficient power management scheme through PD#
鈥?/div>
Uses external 14.138 MHz crystal
鈥?/div>
Alternate frequency selections available through I
2
C
control.
Pin Configuration
*FS2//REF0
VDD0
X1
X2
GND0
GND1
3V66-0
3V66-1
VDD1
VDD2
PCICLK0
PCICLK1
PCICLK2
GND2
PCICLK3
PCICLK4
GND2
PCICLK5
PCICLK6
PCICLK7
VDD2
VDD3
GND3
GND4
48MHz_0
48MHz_1
VDD4
FS0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
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#
SCLK
SDATA
FS1
56-Pin 300mil SSOP
* This input has a 120K鈩?pull-down to GND.
Block Diagram
Functionality
FS2
X
X
0
0
1
1
FS1
0
0
1
1
1
1
FS0
0
1
0
1
1
0
Function
Tristate
Test
Active CPU = 66MHz
SDRAM = 100MHz
Active CPU = 100MHz
SDRAM = 100MHz
Active CPU = 133MHz
SDRAM = 100MHz
(Special Condition)
Active CPU = 133MHz
SDRAM = 133MHz
9250-26 Rev B 01/19/01
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.
ICS9250-26

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