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更新时间： 2024-11-20 11:57:55

品牌	Logo	应用领域
赛普拉斯 - CYPRESS		时钟发生器
页数	文件大小	规格书
15页	583K
描述
Programmable Spread Spectrum Clock Generator for EMI Reduction

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CY25200

Programmable Spread Spectrum

Clock Generator for EMI Reduction

Programmable Spread Spectrum Clock Generator for EMI Reduction

Features

Description

■ Wide Operating Output (SSCLK) Frequency Range

❐ 3 to 200 MHz

The CY25200 is a programmable clock generator with spread

spectrum capability. Spread spectrum modulates the output

clock frequency over a small range, spreading the energy and

reducing the energy peak. This is a powerful technique to reduce

EMI in a variety of applications.

■ Programmable Spread Spectrum with Nominal 31.5 kHz

modulation Frequency

■ Center Spread: ±0.25% to ±2.5%

■ Down Spread: –0.5% to –5.0%

It uses either an external reference clock or a crystal for an input.

It also uses a PLL to generate a spread spectrum output clock

that can be a different frequency than the input. Up to six output

clocks are available and up to two of them can be REFCLKs

(copies of the input clock, without spread).

■ Input Frequency Range

❐ External crystal: 8 to 30 MHz fundamental crystals

❐ External reference: 8 to 166 MHz clock

The CY25200 is highly configurable. Programmable variables

include the input and output frequencies, spread percentage,

center spread or down spread, and control pin functions. The

oscillator pin capacitance can also be programmed to match the

load capacitance requirement (C_L)of the crystal, eliminating the

need for external capacitors.

■ Integrated Phase-Locked Loop (PLL)

■ Programmable Crystal Load Capacitor Tuning Array

■ Low Cycle-to-Cycle Jitter

■ 3.3 V Operation with 2.5 V Output Clock Drive Option

■ Spread Spectrum On and Off Function

■ Power Down or Output Enable Function

■ Output Frequency Select Option

Available features include Output Enable, Power Down, Spread

On/Off, Frequency Select, and the option to power some output

clocks at 2.5 V.

Cypress’ web-based CyberClocks Online software is used to

configure the device. Programmability enables fast prototyping,

which is particularly useful when doing EMC testing and

determining the optimal spread settings.

■ Field-Programmable

■ Package: 16 Pin TSSOP

Logic Block Diagram

SSCLK1

SSCLK2

Divider

Bank 1

Output

Select

Matrix

SSCLK3

SSCLK4

XIN/CLKIN

XOUT



OSC.

VCO

XOUT

Divider

Bank 2

XIN

PLL

SSCLK5/REFOUT/CP2

SSCLK6/REFOUT/CP3

AVSS VSS

VDD

AVDD

VDDL VSSL

CP0 CP1

Cypress Semiconductor Corporation

Document Number: 38-07633 Rev. *H

•

198 Champion Court

•

San Jose, CA 95134-1709

•

408-943-2600

Revised December 7, 2010

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