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ICS9248F-126 PDF预览

ICS9248F-126

更新时间: 2024-09-24 23:57:47
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描述
Peripheral IC

ICS9248F-126 数据手册

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Integrated  
Circuit  
Systems, Inc.  
ICS9248-126  
Frequency Generator & Integrated Buffers for Celeron & PII/III™ & K6  
Recommended Application:  
Pin Configuration  
Motherboard Single chip clock solution for Pentium II/III and  
K6 processors, using SIS540/SIS630 style chipset"  
Output Features:  
VDDREF  
*1REF0/FS3  
GND  
1
2
48  
47  
46  
45  
44  
43  
42  
41  
40  
39  
38  
37  
36  
35  
34  
33  
32  
31  
30  
29  
28  
27  
26  
25  
REF1  
VDDLCPU  
CPUCLK0  
CPUCLK1  
GND  
CPUCLK2  
VDDSDR  
SDRAM13  
SDRAM12  
GND  
SDRAM11  
SDRAM10  
VDDSDR  
SDRAM9  
SDRAM8  
GNDSDR  
SDRAM7  
SDRAM6  
VDDSDR  
SDRAM5  
SDRAM4  
VDDSDR  
48MHz/FS0*1  
24_48MHz/CPU2.5_3.3#*  
3
4
5
6
7
8
9
10  
11  
12  
13  
14  
15  
16  
17  
18  
19  
20  
21  
22  
23  
24  
X1  
X2  
3- CPUs @ 2.5/3.3V, up to 166MHz.  
14 - SDRAM @ 3.3V  
VDDPCI  
*PCICLK0/FS1  
*PCICLK1/FS2  
PCICLK2  
GND  
7- PCI @3.3V,  
PCICLK3  
PCICLK4  
PCICLK5  
PCICLK6  
VDDSDR  
GND  
SDRAM0  
SDRAM1  
VDDSDR  
SDRAM2  
SDRAM3  
GND  
1- 48MHz, @3.3V fixed.  
1- 24/48MHz, @3.3V selectable by I2C  
(Default is 24MHz).  
2- REF @3.3V, 14.318MHz.  
Features:  
Up to 166MHz frequency support  
Support FS0-FS3 trapping status bit for I2C read back.  
SDATA  
SCLK  
Support power management: CPU, PCI, SDRAM stop  
and Power down Mode form I2C programming.  
Spread spectrum for EMI control (0 to -0.5%, ± 0.25%).  
48-Pin 300mil SSOP  
* These inputs have a 120K pull down to GND"  
1 These are double strength"  
FS0, FS1, FS3 must have a internal 120K pull-Down  
to GND.  
Uses external 14.318MHz crystal  
Skew Specifications:  
CPU - CPU: < 175ps  
SDRAM - SDRAM < 500ps  
PCI - PCI: < 500ps  
CPU - SDRAM: < 500ps  
CPU - PCI: 1 - 4ns  
Functionality  
Block Diagram  
CPU  
(MHz)  
66.6  
100.0  
150.0  
133.3  
66.8  
100.0  
100.0  
133.3  
66.8  
97.0  
70.0  
95.0  
95.0  
112.0  
97.0  
96.2  
SDRAM PCICLK  
FS3 FS2 FS1 FS0  
PLL2  
48MHz  
(MHz)  
100.0  
100.0  
100.0  
100.0  
133.6  
133.3  
150.0  
133.3  
66.8  
(MHz)  
33.3  
33.3  
37.5  
33.3  
33.4  
33.3  
37.5  
33.3  
33.4  
32.3  
35.0  
31.7  
31.7  
37.3  
32.2  
32.1  
24_48MHz  
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
/ 2  
X1  
X2  
XTAL  
OSC  
REF (1:0)  
2
PLL1  
Spread  
Spectrum  
CPU  
CLOCK  
DIVDER  
CPUCLK (2:0)  
SDRAM (13:0)  
3
SDRAM  
CLOCK  
DIVDER  
4
LATCH  
14  
FS(3:0)  
97.0  
105.0  
95.0  
PCI  
CLOCK  
DIVDER  
PCICLK (6:0)  
Control  
Logic  
7
126.7  
112.0  
129.3  
96.2  
CPU2.5_3.3#  
Config.  
Reg.  
SDATA  
SCLK  
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  
9248-126 Rev C 9/6/00  
Third party brands and names are the property of their respective owners.  
information being relied upon by the customer is current and accurate.  

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