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ICS9248-157 PDF预览

ICS9248-157

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
11页 152K
描述
Frequency Timing Generator for Pentium II Systems

ICS9248-157 数据手册

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Integrated  
Circuit  
Systems, Inc.  
ICS9248-157  
Frequency Timing Generator for Pentium II Systems  
Recommended Application:  
ALI1621/1632M style chipsets  
Output Features:  
2 - CPUs @2.5V, up to 140MHz.  
7 - PCI @3.3V, (including one free running)  
1 - 48MHz, @3.3V fixed.  
Pin Configuration  
1
2
28  
27  
26  
25  
24  
23  
22  
21  
20  
19  
18  
17  
16  
15  
*FS1/REF0  
X1  
VDDR  
2 - REF @3.3V, 14.318MHz.  
REF1/FS0*  
SPREAD#  
VDDL  
CPUCLK1  
CPUCLK0/F  
GNDL  
GND  
PCI_STOP#  
VDDA  
3
X2  
Features:  
4
**FS2/PCICLK_F  
*SEL_CPUF#/PCICLK0  
PCICLK1  
5
Up to 140 MHz frequency support  
Support power management: CPU, PCI stop and  
Power down.  
Spread spectrum for EMI control (0.5% down spread).  
Uses external 14.318MHz crystal  
FS pins for frequency select  
6
7
GND  
VDDPCI  
PCICLK2  
PCICLK3  
PCICLK4  
PCICLK_E  
VDD48  
8
9
10  
11  
12  
13  
14  
CPU_STOP#  
PD#  
DIV/4#  
Key Specifications:  
GND  
*FS3/48MHz  
CPU – CPU: <175ps  
PCI – PCI: <250ps  
CPU(early)-PCI: 1.5ns - 4ns  
PCI_E (early) - PCI: 2.1ns  
28 Pin 209mil SSOP  
*These inputs have a 120K pull up to VDD  
**These inputs have a 120K pull down to GND  
Block Diagram  
Functionality  
FS3  
0
FS2  
0
FS1 FS0  
CPU  
33.33  
63.33  
69.99  
66.66  
97.00  
96.22  
91.50  
83.33  
50.00  
95.25  
105.00  
100.00  
66.66  
126.35  
139.65  
133.33  
PCI  
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
16.66  
31.66  
35.00  
33.33  
32.33  
32.07  
30.50  
27.77  
16.66  
31.75  
35.00  
33.33  
16.66  
31.66  
35.00  
33.33  
0
0
X1  
REF (1:0)  
OSC  
2
X2  
0
0
0
0
CPU_STOP#  
0
1
PLL  
Spread  
Spectrum  
CPU  
STOP  
0
1
CPUCLK 1  
FS (3:0)  
2
/ 4  
0
1
CPU  
STOP  
CPUCLK0/F  
0
1
Glitch  
Free  
Control  
Logic  
PD#  
Div4#  
1
0
/ 2  
/ 3  
BUS  
STOP  
SPREAD#  
PCICLK (4:0),  
PCICLK_E  
5
1
0
SEL_CPUF#  
PCI_STOP#  
1
0
PCICLK_F  
48MHz  
1
0
1
1
PLL2  
1
1
1
1
1
1
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 information being relied upon by the customer is  
9248-157 Rev A - 1/16/01  
Third party brands and names are the property of their respective owners.  

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