Datasheet > CYIFS741BSXBT

CYIFS741BSXBT

更新时间： 2024-02-14 20:43:55

品牌	Logo	应用领域
赛普拉斯 - CYPRESS		时钟光电二极管外围集成电路晶体
页数	文件大小	规格书
19页	1163K
描述
Clock Generator, 68MHz, CMOS, PDSO8, SOIC-8

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技术参数
数据手册

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CYIFS741BSXBT 技术参数

生命周期：	Obsolete	包装说明：	SOIC-8
Reach Compliance Code：	unknown	ECCN代码：	EAR99
HTS代码：	8542.39.00.01	风险等级：	5.79
其他特性：	CAN ALSO OPERATE AT 5V SUPPLY	JESD-30 代码：	R-PDSO-G8
长度：	4.889 mm	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：	68 MHz	封装主体材料：	PLASTIC/EPOXY
封装代码：	SOP	封装形状：	RECTANGULAR
封装形式：	SMALL OUTLINE	主时钟/晶体标称频率：	30 MHz
座面最大高度：	1.727 mm	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	端子形式：	GULL WING
端子节距：	1.27 mm	端子位置：	DUAL
宽度：	3.8985 mm	uPs/uCs/外围集成电路类型：	CLOCK GENERATOR, OTHER
Base Number Matches：	1

CYIFS741BSXBT 数据手册

CYIFS741

Low EMI Spread Spectrum Clock

Low EMI Spectrum Spread Clock

Features

Functional Description

■ Reduces Systemic EMI.

The CYIFS741 is a frequency spreading EMI attenuator

designed for the purpose of reducing electromagnetic

interference (EMI) found in today’s high speed digital systems.

The CYIFS741 uses a proprietary technique to modulate the

output clock frequency, Modout. By modulating the frequency of

the digital clock, measured EMI at the fundamental and harmonic

frequencies is greatly reduced. This reduction in radiated energy

can significantly reduce the cost of complying with regulatory

requirements without degrading digital waveforms.

■ Modulates external clocks including crystals, crystal oscillators

and ceramic resonators.

■ 3–5 Volt power supply.

■ Modulation programmable with simple external loop filter (LF).

■ 4 to 68 MHz operating frequency range.

■ Digitally controlled modulation.

■ TTL/CMOS compatible outputs.

■ Center Spread Modulation.

The CYIFS741 is a very simple device to use. By programming

the two range select lines, RS0 and RS1, the CYIFS741 can

operate over a very wide range of input frequencies. By utilizing

bi-directional buffer design, the pin count of the CYIFS741 is kept

to a minimum. Bi-directional Buffers is a method of providing an

input control signal and an output driver circuit on the same pin.

Bi-Directional Buffers is discussed further on page 6. The

CYIFS741 also provides a buffered reference clock output,

Refout, which can be turned on or off by controlling the Ref_Off

pin. The Refout clock can be used to drive system logic that can

not tolerate frequency spreading, or as a comparison of EMI

reduction with respect to the Modout driver. The CYIFS741 has

a simple frequency selection table that allows it to operate from

4 MHz to 68 MHz in four separate ranges. The bandwidth of the

frequency spread at Modout is determined by the values of the

loop filter components. The modulation rate is determined by the

input frequency and the input frequency range selected. The

bandwidth of the CYIFS741 can be programmed from as little as

0.3% up to as much as 4.0% by selecting the proper loop filter.

It is for this reason that the CYIFS741 uses an external loop filter

(LF), in contrast to an internal loop filter type device which would

severely limit the use of a wide range of bandwidths.

■ Low short term jitter.

■ Bi-directional buffers for reduced pin count.

■ Unmodulated Reference Clock Output.

■ Low Power Dissipation;

❐ 3.3 VDC = 21 mW - typical

❐ 5.0 VDC = 70 mW - typical

■ Available in 8-pin SOIC package.

Cypress Semiconductor Corporation

Document Number: 001-73430 Rev. *A

•

198 Champion Court

•

San Jose, CA 95134-1709

•

408-943-2600

Revised November 27, 2014

12 3 4 5 6 7...19

中文翻译

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