W166

更新时间： 2024-11-20 22:14:55

品牌	Logo	应用领域
赛普拉斯 - CYPRESS		/
页数	文件大小	规格书
7页	118K
描述
Spread Spectrum Frequency Timing Generator

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W166 数据手册

W166

Spread Spectrum Frequency Timing Generator

is greatly reduced. Use of this technology allows systems to

pass increasingly difficult EMI testing without resorting to cost-

ly shielding or redesign.

Features

• Maximized EMI suppression using Cypress’s Spread

Spectrum technology

• Generates a spread spectrum copy of the provided

input

• Selectable spreading characteristics

• Integrated loop filter components

• Operates with a 3.3V or 5V supply

• SSON# pin enables frequency spreading

• Low power CMOS design

In a system, not only is EMI reduced in the various clock lines,

but also in all signals which are synchronized to the clock.

Therefore, the benefits of using this technology increase with

the number of address and data lines in the system. The Sim-

plified Block Diagram shows a simple implementation.

Table 1. Frequency Spread Selection

W166

Input

Frequency

(MHz)

Output

• Available in 8-pin SOIC (Small Outline Integrated

Circuit)

FS1

FS0

Frequency (MHz)

50 to 65

±0.625%

±1.25%

±2.5%

Overview

The W166 incorporates the latest advances in PLL spread

spectrum frequency synthesizer techniques. By frequency

modulating the output with a low-frequency carrier, peak EMI

–3.75%

Simplified Block Diagram

Pin Configuration

3.3V or 5V

CLKIN

SSON#

CLKOUT

FS0

GND

FS1

VDD

Oscillator or Reference

Input

Spread Spectrum

Output

(EMI suppressed)

W166

Cypress Semiconductor Corporation

•

3901 North First Street

•

San Jose

•

CA 95134

•

408-943-2600

December 20, 1999, rev. **

12 3 4 5 6 7

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