W166 datasheet(1/7 Pages) CYPRESS

tên linh kiện	W166

Giải thích chi tiết về linh kiện	Spread Spectrum Frequency Timing Generator

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nhà sản xuất	CYPRESS [Cypress Semiconductor]

Trang chủ	http://www.cypress.com

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Spread Spectrum Frequency Timing Generator

W166

Cypress Semiconductor Corporation

•

3901 North First Street

•

San Jose

•

CA 95134

•

408-943-2600

December 20, 1999, rev. **

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

• Available in 8-pin SOIC (Small Outline Integrated

Circuit)

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

is greatly reduced. Use of this technology allows systems to

pass increasingly difficult EMI testing without resorting to cost-

ly shielding or redesign.

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

Frequency (MHz)

FS1

FS0

0

50 to 65

fIN ±0.625%

0

1

50 to 65

fIN ±1.25%

1

0

50 to 65

fIN ±2.5%

1

50 to 65

fIN –3.75%

Simplified Block Diagram

Pin Configuration

Oscillator or Reference

Spread Spectrum

W166

(EMI suppressed)

3.3V or 5V

Input

Output

8

7

6

5

1

2

3

4

CLKIN

NC

GND

FS1

SSON#

CLKOUT

FS0

VDD

Số phần tương tự - W166

nhà sản xuất	tên linh kiện	bảng dữ liệu	Giải thích chi tiết về linh kiện
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	W163	89Kb / 4P	Spread Aware?? Zero Delay Buffer February 21, 2000, rev
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