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C9531

更新时间: 2024-01-16 12:25:39
品牌 Logo 应用领域
赛普拉斯 - CYPRESS 时钟发生器PC
页数 文件大小 规格书
10页 117K
描述
PCIX I/O System Clock Generator with EMI Control Features

C9531 技术参数

是否Rohs认证: 不符合生命周期:Obsolete
零件包装代码:SSOP包装说明:SSOP-28
针数:28Reach Compliance Code:compliant
ECCN代码:EAR99HTS代码:8542.39.00.01
风险等级:5.92JESD-30 代码:R-PDSO-G28
JESD-609代码:e0长度:10.2 mm
端子数量:28最高工作温度:70 °C
最低工作温度:最大输出时钟频率:133.33 MHz
封装主体材料:PLASTIC/EPOXY封装代码:SSOP
封装等效代码:SSOP28,.3封装形状:RECTANGULAR
封装形式:SMALL OUTLINE, SHRINK PITCH峰值回流温度(摄氏度):NOT SPECIFIED
电源:3.3 V主时钟/晶体标称频率:33.33 MHz
认证状态:Not Qualified座面最大高度:2 mm
子类别:Clock Generators最大压摆率:160 mA
最大供电电压:3.465 V最小供电电压:3.135 V
标称供电电压:3.3 V表面贴装:YES
技术:CMOS温度等级:COMMERCIAL
端子面层:Tin/Lead (Sn/Pb)端子形式:GULL WING
端子节距:0.65 mm端子位置:DUAL
处于峰值回流温度下的最长时间:NOT SPECIFIED宽度:5.3 mm
uPs/uCs/外围集成电路类型:CLOCK GENERATOR, PROCESSOR SPECIFICBase Number Matches:1

C9531 数据手册

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C9531  
In this device Spread Spectrum is enabled externally through  
pin 15 (SSCG#) or internally via SMBus Byte 0 Bit 0 and 6.  
Spread spectrum is enabled externally when the SSCG# pin  
is low. This pin has an internal device pull up resistor, which  
causes its state to default to a HIGH (spread spectrum  
modulation disabled) unless externally forced to a low. It may  
also be enabled by programming SMBus Byte 0 Bit 0 LOW (to  
enable SMBus control of the function) and then programming  
SMBus byte 0 bit 6 low to set the feature active.  
Spread Spectrum Clocking  
Down Spread Description  
Spread Spectrum is a modulation technique for distributing  
clock period over a certain bandwidth (called Spread  
Bandwidth). This technique allows the distribution of the  
undesirable electromagnetic energy (EMI) over a wide range  
of frequencies therefore reducing the average radiated energy  
present at any frequency over a given time period. As the  
spread is specified as a percentage of the resting (non-spread)  
frequency value, it is effective at the fundamental and, to a  
greater extent, at all of its harmonics.  
S p r e a d o f f  
S p r e a d o n  
C e n te r F r e q u e n c y ,  
S p r e a d o f f  
C e n te r F r e q u e n c y ,  
S p r e a d o n  
Figure 1. Spread Spectrum  
Table 6. Spectrum Spreading Selection Table[5]  
% of Frequency Spreading  
SMBus Byte 0 Bit 5 = 0 SMBus Byte 0 Bit 5 = 1  
Output Clock Frequency  
33.3 MHz (XIN)  
Mode  
1.0% (–1.0% + 0%)  
1.0% (–1.0% + 0%)  
1.0% (–1.0% + 0%)  
1.0% (–1.0% + 0%)  
0.5% (–0.5% + 0%)  
0.5% (–0.5% + 0%)  
0.5% (–0.5% + 0%)  
0.5% (–0.5% + 0%)  
Down Spread  
Down Spread  
Down Spread  
Down Spread  
66.6 MHz (XIN*2)  
100.0 MHz (XIN*3)  
133.3 MHz (XIN*4)  
Note:  
5. When SSCG is enabled, the device will down spread the clock over a range that is 1% of its resting frequency. This means that for a 100-MHz output clock  
frequency will sweep through a spectral range from 99 to 100 MHz.  
Document #: 38-07034 Rev. *D  
Page 6 of 10  

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