Cypress CY25566 manual Features, Applications, Benefits, Block Diagram

Features

•25- to 200-MHz operating frequency range

•Wide range of spread selections (9)

•Accepts clock or crystal inputs

•Provides four clocks

—SSCLK1a

—SSCLK1b

—SSCLK2

—REFOUT

•Low-power dissipation

—3.3V = 70 mW (typical @ 40 MHz, no load)

CY25566

Spread Spectrum Clock Generator

•Center spread modulation

•Low cycle-to cycle jitter

•16-pin SOIC package

Applications

•High-resolution VGA controllers

•LCD panels and monitors

•Printers and MFPs

Benefits

•Peak EMI reduction by 8 to 16 dB

•Fast time to market

•Cost reduction

Block Diagram Pin Configuration

					REFOFF
					2
		300K			3	REFOUT	XIN/CLKIN	1
Xin/	1	REFERENCE					REFOFF	2
CLK		DIVIDER	PD	CP	Loop		REFOUT	3
					Filter
							VDD	4
Xout	16	MODULATION	FEEDBACK				VSS	5
					vco
							S2	6
		CONTROL	DIVIDER

S3 7

SSCLK1a 8

VDD	4	INPUT			DIVIDER
		DECODER			&	8 SSCLK1a
		LOGIC			MUX
VSS	5	VDD		VDD		9 SSCLK1b
VSS 11		20 K		20 K	/2	15 SSCLK2
				RANGE
VSS 14				CONTROL
		20 K		20 K
		VSS		VSS
	10	12	13	6	7
	SSCC	S1	S0	S2	S3

CY25566

16XOUT

15SSCLK2

14VSS

13S0

12S1

11VSS

10SSCC

9 SSCLK1b

Cypress Semiconductor Corporation • 3901 North First Street • San Jose	• CA 95134 • 408-943-2600
Document #: 38-07429 Rev. *B	Revised October 26, 2005

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