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参数资料
| 型号： | SM561BZ |
| 厂商： | CYPRESS SEMICONDUCTOR CORP |
| 元件分类： | 时钟产生/分配 |
| 英文描述： | 166 MHz, PROC SPECIFIC CLOCK GENERATOR, PDSO8 |
| 封装： | SOIC-8 |
| 文件页数： | 1/10页 |
| 文件大小： | 75K |
| 代理商： | SM561BZ |
Spread Spectrum Clock Generator
Cypress Semiconductor Corporation
525 Los Coches St.
Document#: 38-07021 Rev. **
05/04/2001
Milpitas, CA 95035. Tel: 408-263-6300, Fax: 408-263-6571
Page 1 of 10
http://www.cypress.com
SM561
Features
54 to 166 MHz Operating Frequency Range
Wide (9) Range of Spread Selections
Accepts Clock and Crystal Inputs
Low Power Dissipation
3.3V = 165 mw. (Fin = 120 MHz)
Frequency Spread Disable Function
Center Spread Modulation
Low Cycle-to Cycle Jitter
8-pin SOIC package
Applications
High Resolution VGA Controllers
LCD Panels and Monitors
Work Stations and Servers
Benefits
Peak EMI reduction by 8 to 16dB
Fast Time to Market
Cost Reduction
General Description
The CYPRESS SM561 is a Spread Spectrum Clock Generator (SSCG) IC used for the purpose of reducing Electro
Magnetic Interference (EMI) found in today’s high-speed digital electronic systems.
The SM561 uses a Cypress proprietary Phase-Locked Loop (PLL) and Spread Spectrum Clock (SSC) technology
to synthesize and frequency modulate the input frequency of the reference clock. By frequency modulating the
clock, the measured EMI at the fundamental and harmonic frequencies of Clock (SSCLK) is greatly reduced.
This reduction in radiated energy can significantly reduce the cost of complying with regulatory requirements and
time to market without degrading the system performance.
The SM561 is a very simple and versatile device to use. The frequency and spread % range is selected by
programming S0 and S1digital inputs. These inputs use three (3) logic states including High (H), Low (L) and
Middle (M) logic levels to select one of the 9 available Frequency Modulation and Spread % ranges. Refer to Table
2 for programming details.
The SM561 is intended for use with applications with a reference frequency in the range of 54 to 166 MHz.
A wide range of digitally selectable spread percentages is made possible by using Three-Level (High, Low and
Middle) logic at the S0 and S1 digital control inputs.
The output spread (frequency modulation) is symmetrically centered on the input frequency.
Spread Spectrum Clock Control (SSCC) function enables or disables the frequency spread and is provided for easy
comparison of system performance during EMI testing.
The SM561 is available in an 8-pin SOIC package with a 0 to 70
°C operating temperature range.
Refer to the SM560 datasheet for operation at frequencies from 27 to 108 MHz.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| SM561C107KAN360 | 制造商:AVX Corporation 功能描述:- Bulk |
| SM561K | 制造商:CDE 制造商全称:Cornell Dubilier Electronics 功能描述:Ceramic Capacitors |
| SM562-1 | 功能描述:变压器音频和信号 Line Transformer RoHS:否 制造商:Skyworks Solutions, Inc. 频率范围:810 MHz to 960 MHz 初级线圈阻抗: 次级线圈阻抗: 绝缘电压:23 dB 工作温度范围:- 40 C to + 85 C 端接类型:SMD/SMT 尺寸:6 mm L x 4.9 mm W x 1.6 mm H 产品:Splitters and Combiners |
| SM562-1EL | 制造商:BOURNS 制造商全称:Bourns Electronic Solutions 功能描述:ADSL Line Transformers |
| SM562-1L | 功能描述:变压器音频和信号 Magnetics RoHS:否 制造商:Skyworks Solutions, Inc. 频率范围:810 MHz to 960 MHz 初级线圈阻抗: 次级线圈阻抗: 绝缘电压:23 dB 工作温度范围:- 40 C to + 85 C 端接类型:SMD/SMT 尺寸:6 mm L x 4.9 mm W x 1.6 mm H 产品:Splitters and Combiners |
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