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ICS9248-112 PDF预览

ICS9248-112

更新时间: 2024-11-10 22:11:03
品牌 Logo 应用领域
矽成 - ICSI /
页数 文件大小 规格书
12页 385K
描述
Frequency Generator & Integrated Buffers for Celeron & PII/III⑩

ICS9248-112 数据手册

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ICS9248-112  
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 150MHz.  
9 - SDRAM @ 3.3V, up to150MHz including  
1 free running  
8 - PCICLK @ 3.3V  
1 - IOAPIC @ 2.5V, PCI or PCI/2 MHz  
2 - 3V66MHz @ 3.3V, 2X PCI MHz  
1- 48MHz, @3.3V fixed.  
1- 24MHz, @3.3V fixed  
1- REF @3.3V, 14.318MHz.  
Features:  
Up to 166MHz frequency support  
Support FS0-FS3 strapping status bit for I2C read back.  
Support power management: Through Power down  
Mode from I2C programming.  
Spread spectrum for EMI control ( ± 0.25% center).  
Spread can be enabled or disabled to all 32 frequencies  
throuth I2C.  
Uses external 14.318MHz crystal  
48-Pin 300mil SSOP  
* These inputs have a 120K pull up to VDD.  
1 These are double strength.  
Skew Specifications:  
CPU – CPU: <175ps  
SDRAM - SDRAM: < 250ps  
3V66 – 3V66: <175ps  
PCI – PCI: <500ps  
CPU-SDRAM<500ps  
For group skew specifications, please refer to group  
timing relationship.  
Block Diagram  
Functionality  
IOAPIC  
1=PCICLK/2 0=PCICLK  
IOAPIC  
CPU  
(MHz)  
SDRAM  
(MHz)  
3V66  
(MHz)  
PCICLK  
(MHz)  
FS3 FS2 FS1 FS0  
(MHz)  
16.70  
17.00  
16.72  
17.17  
16.72  
18.13  
16.72  
17.17  
17.50  
23.33  
19.67  
20.67  
22.28  
22.83  
18.75  
18.13  
(MHz)  
33.40  
34.00  
33.43  
34.33  
33.43  
36.25  
33.43  
34.33  
35.00  
46.67  
39.33  
41.33  
44.57  
45.67  
37.50  
36.25  
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
66.80 100.20 66.80  
68.00 102.00 68.00  
100.30 100.30 66.87  
103.00 103.00 68.67  
133.73 100.30 66.87  
145.00 108.75 72.50  
133.73 100.30 66.87  
137.33 103.00 68.67  
140.00 105.00 70.00  
140.00 140.00 93.33  
118.00 118.00 78.67  
124.00 124.00 82.67  
133.70 133.70 89.13  
137.00 137.00 91.33  
150.00 112.50 75.00  
72.50 108.75 72.50  
33.40  
34.00  
33.43  
34.33  
33.43  
36.25  
33.43  
34.33  
35.00  
46.67  
39.33  
41.33  
44.57  
45.67  
37.50  
36.25  
Additional frequencies selectable through I2C programming.  
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- 112 Rev A 2/7/00  
Third party brands and names are the property of their respective owners.  

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