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| 型号： | C9530CT |
| 英文描述： | ST7262 - LOW SPEED USB 8-BIT MCU WITH 3 ENDPOINTS, FLASH OR ROM MEMORY, LVD, WDG, 10-BIT ADC, 2 TIMERS, SCI, SPI |
| 中文描述： | CPU系统时钟发生器|的CMOS | TSSOP封装| 48PIN |塑料 |
| 文件页数： | 3/14页 |
| 文件大小： | 180K |
| 代理商： | C9530CT |
PCIX I/O System Clock Generator With EMI Control Features
Cypress Semiconductor Corporation
525 Los Coches St.
Milpitas, CA 95035. Tel: 408-263-6300, Fax: 408-263-6571
http://www.cypress.com
Document#: 38-07033 Rev. **
5/1/2000
Page 3 of 14
APPROVED PRODUCT
C9530
Spectrum Spread 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 it's harmonics.
In this device, Spread Spectrum is enabled externally through pin 27 (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 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.
Spectrum Spreading Selection Table
Output clock
Frequency
% OF FREQUENCY SPREADING
SMBus Byte 0 Bit 5 =0
1.0% (-1.0% + 0%)
1.0% (-1.0% + 0%)
1.0% (-1.0% + 0%)
1.0% (-1.0% + 0%)
SMBus Byte 0 Bit 5 =1
0.5% (-0.5% + 0%)
0.5% (-0.5% + 0%)
0.5% (-0.5% + 0%)
0.5% (-0.5% + 0%)
MODE
33.3 MHz (XIN)
66.6 MHz (XIN*2)
100.0 MHz (XIN*3)
133.3 MHz (XIN*4)
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 the frequency will sweep through a spectral range from 99 to 100 MHz.
Down Spread
Down Spread
Down Spread
Down Spread
Spread off
Spread on
Center Frequency,
Spread off
Center Frequency,
Spread on
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相关代理商/技术参数 |
参数描述 |
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| C9530CY | 制造商:未知厂家 制造商全称:未知厂家 功能描述:CPU SYSTEM CLOCK GENERATOR|CMOS|SSOP|48PIN|PLASTIC |
| C9531 | 制造商:CYPRESS 制造商全称:Cypress Semiconductor 功能描述:PCIX I/O System Clock Generator with EMI Control Features |
| C9531_04 | 制造商:CYPRESS 制造商全称:Cypress Semiconductor 功能描述:PCIX I/O System Clock Generator with EMI Control Features |
| C9531CT | 制造商:未知厂家 制造商全称:未知厂家 功能描述:CPU SYSTEM CLOCK GENERATOR|TSSOP|28PIN|PLASTIC |
| C9531CY | 制造商:未知厂家 制造商全称:未知厂家 功能描述:CPU SYSTEM CLOCK GENERATOR|SSOP|28PIN|PLASTIC |
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