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CYIFS781BSXC

更新时间： 2024-11-24 12:29:47

品牌	Logo	应用领域
赛普拉斯 - CYPRESS		时钟
页数	文件大小	规格书
12页	252K
描述
Low EMI Spectrum Spread Clock

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CYIFS781BSXC 技术参数

是否Rohs认证：	符合	生命周期：	Obsolete
零件包装代码：	SOIC	包装说明：	SOP, SOP8,.25
针数：	8	Reach Compliance Code：	compliant
ECCN代码：	EAR99	HTS代码：	8542.31.00.01
Factory Lead Time：	1 week	风险等级：	5.75
其他特性：	ALSO OPERATES AT 5V SUPPLY	JESD-30 代码：	R-PDSO-G8
JESD-609代码：	e3	长度：	4.889 mm
湿度敏感等级：	3	端子数量：	8
最高工作温度：	70 °C	最低工作温度：
最大输出时钟频率：	82 MHz	封装主体材料：	PLASTIC/EPOXY
封装代码：	SOP	封装等效代码：	SOP8,.25
封装形状：	RECTANGULAR	封装形式：	SMALL OUTLINE
峰值回流温度（摄氏度）：	260	电源：	3.3,5 V
主时钟/晶体标称频率：	82 MHz	认证状态：	Not Qualified
座面最大高度：	1.727 mm	子类别：	Clock Generators
最大供电电压：	3.63 V	最小供电电压：	2.97 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：	Matte Tin (Sn)	端子形式：	GULL WING
端子节距：	1.27 mm	端子位置：	DUAL
处于峰值回流温度下的最长时间：	20	宽度：	3.8989 mm
uPs/uCs/外围集成电路类型：	CLOCK GENERATOR, OTHER	Base Number Matches：	1

CYIFS781BSXC 数据手册

FS781/82/84

Low EMI Spectrum Spread Clock

Features

Functional Description

The Cypress FS781/82/84 are Spread Spectrum clock

generator ICs (SSCG) designed for the purpose of reducing

electromagnetic interference (EMI) found in today’s

high-speed digital systems.

• Spread Spectrum clock generator (SSCG) with 1×, 2×,

and 4× outputs

• 6- to 82-MHz operating frequency range

• Modulates external clocks including crystals, crystal

oscillators, or ceramic resonators

The FS781/82/84 SSCG clocks use a Cypress-proprietary

technology to modulate the input clock frequency, XIN, by

modulating the frequency of the digital clock. By modulating

the reference clock the measured EMI at the fundamental and

harmonic frequencies of FSOUT is greatly reduced. This

reduction in radiated energy can significantly reduce the cost

of complying with regulatory requirements without degrading

digital waveforms.

• Programmable modulation with simple R-C external

loop filter (LF)

• Center spread modulation

• 3V-5V power supply

• TTL-/CMOS-compatible outputs

• Low short-term jitter

The Cypress FS781/82/84 clocks are very simple and

versatile devices to use. By programming the two range select

lines, S0 and S1, any frequency from 6- to 82-MHz operating

range can be selected. The FS781/2/4 are designed to

operate over a very wide range of input frequencies and

provides 1×, 2×, and 4× modulated clock outputs.

• Low-power Dissipation

— 3.3 VDC = 37 mW – typical

— 5.0 VDC = 115 mW – typical

• Available in 8-pin SOIC and TSSOP packages

The FS78x devices have a simple frequency selection table

that allows operation from 6 MHz to 82 MHz in four separate

ranges. The bandwidth of the frequency spread at FSOUT is

determined by the values of the loop filter components. The

modulation rate is determined internally by the input frequency

and the selected input frequency range.

Applications

• Desktop/notebook computers

• Printers, copiers, and MFP

• Scanners and fax

The Bandwidth of these products can be programmed from as

little as 1.0% up to as much as 4.0% by selecting the proper

loop filter value. Refer to the Loop Filter Selection chart in

Table 2 and Table 3 for the recommended values. Due to a

wide range of application requirements, an external loop filter

(LF) is used on the FS78x products. The user can select the

exact amount of frequency modulation suitable for the appli-

cation. Using a fixed internal loop filter would severely limit

the use of a wide range of modulation bandwidths (Spread %)

to a few discrete values. Refer to FS791/2/4 products for appli-

cations requiring 80- to 140-MHz frequency range.

• LCD displays and monitors

• CD-ROM, VCD, and DVD

• Automotive and embedded systems

• Networking, LAN/WAN

• Digital cameras and camcorders

• Modems

Benefits

• Programmable EMI reduction

• Fast time to market

• Lower cost of compliance

• No degradation in rise/fall times

• Lower component and PCB layer count

Cypress Semiconductor Corporation

Document #: 38-07029 Rev. *F

•

198 Champion Court

•

San Jose, CA 95134-1709

•

408-943-2600

Revised January 2, 2005

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CYIFS781BSXC 替代型号

型号	品牌	替代类型	描述	数据表
CYIFS781BSXCT	CYPRESS	完全替代	Low EMI Spectrum Spread Clock

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