ICS9250-27 Datasheet, PDF (1/14 Pages) Integrated Circuit Systems – Frequency Generator & Integrated Buffers for Celeron & PII/III™

Integrated
Circuit
Systems, Inc.
ICS9250-27
Frequency Generator & Integrated Buffers for Celeron & PII/III™
Recommended Application:
810/810E and 815 type chipset.
Output Features:
• 3 CPU (2.5V) (up to 133MHz achievable through I²C)
• 9 SDRAM (3.3V) (up to 133MHz achievable
through I²C)
• 7 PCI (3.3 V) @33.3MHz
• 2 IOAPIC (2.5V) @ 33.3 MHz
• 3 Hublink clocks (3.3 V) @ 66.6 MHz
• 2 (3.3V) @ 48 MHz (Non spread spectrum)
• 1 REF (3.3V) @ 14.318 MHz
Features:
• Supports spread spectrum modulation,
0 to -0.5% down 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.
*FS2//REF0
VDD
X1
X2
GND
GND
3V66-0
3V66-1
3V66-2
VDD
VDD
PCICLK_F
PCICLK0
GND
PCICLK1
PCICLK2
GND
PCICLK3
PCICLK4
PCICLK5
VDD
VDD
GND
GND
48MHz_0
48MHz_1
VDD
FS0
Pin Configuration
1
56
GND
2
55
IOAPIC0
3
54
IOAPIC1
4
53
VDDL
5
52
CPUCLK0
6
51
VDDL0
7
50
CPUCLK1
8
49
CPUCLK2
9
48
GNDL
10
47
GND
11
46
SDRAM0
12
45
SDRAM1
13
44
VDD
14
43
SDRAM2
15
42
SDRAM3
16
41
GND
17
40
SDRAM4
18
39
SDRAM5
19
38
VDD
20
37
SDRAM6
21
36
SDRAM7
22
35
GND
23
34
SDRAM_F
24
33
VDD
25
32
PD#
26
31
SCLK
27
30
SDATA
28
29
FS1
Block Diagram
56-Pin 300mil SSOP
* This input has a 50KΩ pull-down to GND.
Functionality
X1
XTAL
X2
OSC
PLL1
Spread
Spectrum
/2 /3
FS (2:0)
PD#
SDATA
SCLK
Control
Logic
Config
Reg
PLL2
/2
/2
REF0
VDDL
3 ^{CPU66/100/133 (2:0)}
3V66 (2:0)
3
SDRAM (7:0)
8
SDRAM_F
PCICLK (5:0)
6
PCICLK_F
IOAPIC (1:0)
2
VDDL
2 ^{48MHz (1:0)}
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
0
Active CPU = 133MHz
SDRAM = 133MHz
1
1
1
Active CPU = 133MHz
SDRAM = 100MHz
Power Groups
AVDD = Pin 22 Analog power for PLL
AGND = Pin 23 Analog ground
VDD48 = Pin 27 Analog power for 48MHz PLL
GND = Pin 24 Analog ground for 48MHz PLL
9250-27 Rev B 02/15/01
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.