ICS9250-29 Datasheet, PDF (1/15 Pages) Integrated Circuit Systems – Frequency Generator & Integrated Buffers for Celeron & PII/III™

Integrated
Circuit
Systems, Inc.
ICS9250-29
Frequency Generator & Integrated Buffers for Celeron & PII/III™
Recommended Application:
Solano type chipset.
Output Features:
• 2 CPU (2.5V) (up to 133MHz achievable through I²C)
• 13 SDRAM (3.3V) (up to 133MHz achievable
through I²C)
• 5 PCI (3.3 V) @33.3MHz
• 1 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.
Pin Configuration
IOAPIC
1
VDDL
2
GNDL
3
*FS1/REF
4
VDDR
5
X1
6
X2
7
GNDR
8
VDD3
9
3V66-0
10
3V66-1
11
3V66-2
12
GND3
13
PCICLK0
14
PCICLK1
15
PCICLK2
16
VDD2
17
GND2
18
PCICLK3
19
PCICLK4
20
FS0
21
GNDA
22
VDDA
23
SCLK
24
SDATA
25
GNDF
26
VDDF
27
48MHz_0
28
56
GNDL
55
VDDL
54
CPUCLK0
53
CPUCLK1
52
GND1
51
SDRAM0
50
SDRAM1
49
VDD1
48
GND1
47
SDRAM2
46
SDRAM3
45
SDRAM4
44
SDRAM5
43
VDD1
42
GND1
41
SDRAM6
40
SDRAM7
39
SDRAM8
38
SDRAM9
37
VDD1
36
GND1
35
SDRAM10
34
SDRAM11
33
VDD1
32
GND1
31
SDRAM12
30
TRISTATE#/PD#**
29
48MHz_1
56-Pin 300mil SSOP
* This input has a 50K9 pull-down to GND.
** This input has a 50K9pull-up to VDD
Block Diagram
X1
XTAL
X2
OSC
PLL1
Spread
Spectrum
/2 /3
FS(1:0)
PD#
TRISTATE#
SDATA
SCLK
Control
Logic
Config
Reg
PLL2
/2
/2
REF
VDDL
2 ^{CPU66/100/133 [1:0]}
3V66 [2:0]
3
SDRAM [12:0]
13
PCICLK [4:0]
5
IOAPIC
VDDL
2 ^{48MHz [1:0]}
Functionality
Tristate# FS0
0
0
0
1
1
0
1
1
1
0
1
1
FS1
CPU
MHz
SDRAM
MHz
X Tristate Tristate
X Test
Test
0 66MHz 100MHz
0 100MHz 100MHz
1 133MHz 133MHz
1 133MHz 100MHz
Power Groups
VDDA, GNDA = CPU, PLL (analog)
VDDF, GNDF = Fixed PLL, 48M (analog/digital)
VDDR, GNDR = REF, X1, X2 (analog/digital)
VDD3, GND3 = 3V66 (digital)
VDD2, GND2 = PCI (digital)
VDD1, GND1 = SDRAM (digital)
VDDL, GNDL = IOAPIC, CPU (digital)
9250-29 Rev A 02/01/01
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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.