ICS9250-25
Integrated
Circuit
Systems, Inc.
Preliminary Product Preview
Frequency Generator & Integrated Buffers for Celeron & PII/III™
Recommended Application:
Pin Configuration
810/810E and Solano type chipset
VDDREF
X1
1
2
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
REF0/FS4*1
VDDLAPIC
IOAPIC
X2
3
4
5
6
7
8
9
Output Features:
GNDREF
GND3V66
3V66-0
3V66-1
3V66-2
VDDLCPU
CPUCLK0
CPUCLK1
GNDLCPU
GNDSDR
SDRAM0
SDRAM1
SDRAM2
VDDSDR
SDRAM3
SDRAM4
SDRAM5
GNDSDR
SDRAM6
SDRAM7
SDRAM_F
VDDSDR
GND48
•
•
•
•
•
•
•
2 - CPUs @ 2.5V, up to 153.33MHz.
13 - SDRAM @ 3.3V, up to 153.33MHz.
3 - 3V66 @ 3.3V, 2x PCI MHz.
8 - PCI @3.3V.
1 - 48MHz, @3.3V fixed.
1 - 24MHz @ 3.3V
VDD3V66
VDDPCI
1*FS0/PCICLK0
1*FS1/PCICLK1
PCICLK2
GNDPCI
PCICLK3
PCICLK4
PCICLK5
VDDPCI
PCICLK6
PCICLK7
GNDPCI
PD#
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
1 - REF @3.3V, 14.318MHz.
Features:
•
•
•
Up to 153.33MHz frequency support
Support power management through PD#.
Spread spectrum for EMI control (± 0.25%)
center spread.
24MHz/FS2*
48MHz/FS3*1
VDD48
VDDSDR
SDRAM8
SDRAM9
GNDSDR
SCLK
SDATA
VDDSDR
SDRAM11
SDRAM10
GNDSDR
•
•
Uses external 14.318MHz crystal
FS pins for frequency select
Key Specifications:
•
•
CPU Output Jitter: <250ps
IOAPIC Output Jitter: <500ps
56-Pin 300 mil SSOP
1ꢀ These pins will have 1ꢀ5 to 2X drive strengthꢀ
* 120K ohm pull-up to VDD on indicated inputsꢀ
•
•
•
•
•
•
48MHz, 3V66, PCI Output Jitter: <500ps
Ref Output Jitter. <1000ps
CPU Output Skew: <175ps
PCI Output Skew: <500ps
Block Diagram
3V66 Output Skew <175ps
For group skew timing, please refer to the
Group Timing Relationship Table.
PLL2
48MHz
24MHz
/ 2
X1
X2
XTAL
OSC
REF0
PLL1
Spread
CPU
DIVDER
CPUCLK [1:0]
2
Spectrum
SDRAM
DIVDER
SDRAM [11:0]
SDRAM_F
IOAPIC
12
Control
Logic
FS[4:0]
PD#
IOAPIC
DIVDER
Config.
Reg.
PCI
DIVDER
PCICLK [7:0]
3V66 [2:0]
SDATA
SCLK
8
3
3V66
DIVDER
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.
9250-25 Rev A 10/03/00
Third party brands and names are the property of their respective owners.