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ICS9248-87 PDF预览

ICS9248-87

更新时间： 2024-11-10 22:55:27
品牌 Logo 应用领域
矽成 - ICSI /
页数 文件大小 规格书
13页 362K
描述
Frequency Generator & Integrated Buffers for Celeron & PII/III⑩

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中文翻译

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ICS9248-87 数据手册

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ICS9248-87  
Integrated  
Circuit  
Systems, Inc.  
Preliminary Product Preview  
Frequency Generator & Integrated Buffers for Celeron & PII/III™  
Recommended Application:  
810/810E type chipset.  
Pin Configuration  
Output Features:  
•
•
•
•
•
•
•
•
2- CPUs @2.5V, up to 155MHz.  
9 - SDRAM @ 3.3V, up to 155MHz.  
8 - PCICLK @ 3.3V  
1 - IOAPIC @ 2.5V,  
2 - 3V66MHz @ 3.3V  
2- 48MHz, @3.3V fixed.  
1- 24/48MHz, @3.3V  
1- REF @3.3V, 14.318MHz.  
Features:  
•
•
•
Up to 155MHz frequency support  
Support FS0-FS3 strapping status bit for I2C read back.  
Support power management: Power down Mode from I2C  
programming.  
•
•
Spread spectrum for EMI control ( ± 0.25% center).  
Uses external 14.318MHz crystal  
Skew Specifications:  
48-Pin 300mil SSOP  
*: These inputs have a 120K pull up to VDD.  
1: These are double strength.  
•
•
•
•
•
CPU – CPU: <175ps  
SDRAM - SDRAM: < 250ps  
3V66 – 3V66: <175ps  
PCI – PCI: <500ps  
For group skew specification, please refer to group  
timing relationships table.  
Block Diagram  
Functionality  
PCICLK IOAPIC  
PLL2  
48MHz  
IOAPIC  
(PCI)  
(MHz)  
2
CPU  
CPU/  
SDRAM 3V66  
(3V66*  
1/2)  
(PCI*  
1/2)  
FS3 FS2 FS1 FS0  
24_48MHz  
(MHz) SDRAM (MHz)  
(MHz)  
/ 2  
(MHz)  
(MHz)  
X1  
X2  
XTAL  
OSC  
83.3  
1.00  
83.3  
55.48  
82.67  
27.74  
41.33  
51.67  
36.00  
35.00  
37.33  
50.00  
35.00  
34.17  
35.67  
46.00  
34.34  
33.40  
33.40  
44.53  
33.40  
13.87  
20.67  
25.83  
18.00  
17.50  
18.67  
25.00  
17.50  
17.08  
17.83  
23.00  
17.17  
16.70  
16.70  
22.27  
16.70  
27.74  
41.33  
51.67  
36.00  
35.00  
37.33  
50.00  
35.00  
34.17  
35.67  
46.00  
34.34  
33.40  
33.40  
44.53  
33.40  
REF1  
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
124.00  
155.00  
143.96  
70.00  
1.00 124.00  
1.00 155.00 103.33  
PLL1  
Spread  
Spectrum  
CPU  
DIVDER  
CPUCLK [1:0]  
2
8
1.33 108.00  
0.67 105.00  
1.00 112.00  
72.00  
70.00  
74.67  
SDRAM  
DIVDER  
112.00  
150.00  
140.00  
68.33  
SDRAM [7:0]  
SDRAM_F  
1.00 150.00 100.00  
SEL24_48#  
SDATA  
1.33 105.00  
0.67 102.50  
1.00 107.00  
1.00 138.00  
1.33 103.00  
0.67 100.20  
1.00 100.30  
1.00 133.60  
1.33 100.20  
70.00  
68.33  
71.33  
92.00  
68.67  
66.80  
66.80  
89.07  
66.80  
Control  
Logic  
I2C  
{
IOAPIC  
DIVDER  
SCLK  
IOAPIC  
107.00  
138.00  
137.33  
66.80  
FS[3:0]  
PCI  
DIVDER  
PD#  
PCICLK [7:0]  
8
2
Config.  
Reg.  
100.30  
133.60  
133.60  
3V66  
DIVDER  
3V66 [1:0]  
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.  
9248-87 Rev D 10/27/00  
Third party brands and names are the property of their respective owners.  
1234567...13

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