ICS9250-30 Datasheet, PDF (1/13 Pages) Integrated Circuit Systems – Frequency Generator & Integrated Buffers for Celeron & PII/III™

Integrated
Circuit
Systems, Inc.
ICS9250-30
Preliminary Product Preview
Frequency Generator & Integrated Buffers for Celeron & PII/III™
Recommended Application:
810/810E and Solano type chipset
Output Features:
• 2 - CPUs @ 2.5V, up to 200MHz.
• 13 - SDRAM @ 3.3V, up to 200MHz.
• 3 - 3V66 @ 3.3V, 2x PCI MHz.
• 8 - PCI @3.3V.
• 1 - 48MHz, @3.3V fixed.
• 1 - 24/48MHz @ 3.3V
• 1 - REF @3.3V, 14.318MHz.
Features:
• Support PC133 SDRAM.
• Up to 200MHz frequency support
• Support power management through PD#.
• Spread spectrum for EMI control
(± 0.25% Center Spread or 0 to -0.5% down spread)
• Uses external 14.318MHz crystal
• FS pins for frequency select
Key Specifications:
• CPU Output Jitter: <250ps
• CPU Output Skew: <175ps
• PCI Output Skew: <500ps
• 3V66 Output Skew <175ps
• For group skew timing, please refer to the
Group Timing Relationship Table.
Block Diagram
PLL2
X1
XTAL
X2
OSC
PLL1
Spread
Spectrum
FS[4:0]
PD#
SEL24_48#
SDATA
SCLK
Control
Logic
Config.
Reg.
/2
CPU
DIVDER
SDRAM
DIVDER
IOAPIC
DIVDER
PCI
DIVDER
3V66
DIVDER
48MHz
24_48MHz
REF0
2 ^{CPUCLK [1:0]}
12 ^{SDRAM [11:0]}
SDRAM_F
IOAPIC
PCICLK [7:0]
8
3V66 [2:0]
3
VDDREF
X1
X2
GNDREF
GND3V66
3V66-0
3V66-1
3V66-2
VDD3V66
VDDPCI
1_*FS0/PCICLK0
1_*FS1/PCICLK1
1_{*SEL24_48#/PCICLK2}
GNDPCI
PCICLK3
PCICLK4
PCICLK5
VDDPCI
PCICLK6
PCICLK7
GNDPCI
PD#
SCLK
SDATA
VDDSDR
SDRAM11
SDRAM10
GNDSDR
Pin Configuration
1
56
REF0/FS4*¹
2
55
VDDLAPIC
3
54
IOAPIC
4
53
VDDLCPU
5
52
CPUCLK0
6
51
CPUCLK1
7
50
GNDLCPU
8
49
GNDSDR
9
48
SDRAM0
10
47
SDRAM1
11
46
SDRAM2
12
45
VDDSDR
13
44
SDRAM3
14
43
SDRAM4
15
42
SDRAM5
16
41
GNDSDR
17
40
SDRAM6
18
39
SDRAM7
19
38
SDRAM_F
20
37
VDDSDR
21
36
GND48
22
35
24_48MHz/FS2¹*
23
34
48MHz/FS3*¹
24
33
VDD48
25
32
VDDSDR
26
31
SDRAM8
27
30
SDRAM9
28
29
GNDSDR
56-Pin 300 mil SSOP
1. These pins will have 1.5 to 2X drive strength.
* 120K ohm pull-up to VDD on indicated inputs.
Functionality
FS4 FS3 FS2 FS1 FS0
00000
00011
00110
00111
01000
01011
01110
01111
10000
10001
10011
10111
11000
11001
11011
11111
CPU
66.67
68.33
80.00
83.00
100.00
103.00
115.00
200.00
133.33
166.67
137.00
160.00
133.33
166.67
137.00
160.00
SDRAM
100.00
102.50
120.00
124.50
100.00
103.00
115.00
200.00
133.33
166.67
137.00
160.00
100.00
125.00
102.75
120.00
3V66
66.67
68.33
80.00
83.00
66.67
68.67
76.67
66.67
66.67
83.34
68.50
80.00
66.67
83.34
68.50
80.00
PCI
33.33
34.17
40.00
41.50
33.33
34.33
38.33
33.33
33.33
41.67
34.25
40.00
33.33
41.67
34.25
40.00
For other hardware/I²C selectable frequencies please refer to
Byte 0 frequency select register.
9250-30 Rev A 10/03/00
Third party brands and names are the property of their respective owners.
PRODUCT PREVIEW documents contain information on new products
in the sampling or preproduction phase of development. Characteristic
data and other specifications are subject to change without notice.