Cypress CY25566 User Manual

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Spread Spectrum Clock Generator
CY25566
Cypress Semiconductor Corporation 3901 North First Street San Jose CA 95134 408-943-2600
Document #: 38-07429 Rev. *B Revised October 26, 2005
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)
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
116
15
14
13
98
7
6
5
4
3
2
10
11
12
XI N/CLKI N
REFOFF
VDD
VSS
S2
S3
SSCLK1a
REFOUT
SSCLK1b
SSCC
VSS
S1
S0
VSS
SSCLK2
XOUT
CY25566
3
PD
REFERENCE
DIVIDER
Loop
Filter
1
4
MODULATION
CONTROL
INPUT
DECODER
LOGIC
FEEDBACK
DIVIDER
vco
DIVIDER
&
MUX
16
5
CP
SSCLK1a
S0S1
12
13
10
8
20 K
20 K20 K
20 K
SSCC
VDD
VSS
Xout
Xin/
CLK
VDDVDD
VSSVSS
300K
14
11
VSS
VSS
RANGE
CONTROL
6
7
S3S2
9
15
SSCLK1b
SSCLK2
/2
2
REFOUT
REFOFF
[+] Feedback
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Summary of Contents

Page 1 - Pin Configuration

Spread Spectrum Clock GeneratorCY25566Cypress Semiconductor Corporation • 3901 North First Street • San Jose • CA 95134 • 408-943-2600Document #: 38-

Page 2 - CY25566

CY25566Document #: 38-07429 Rev. *B Page 2 of 9 General DescriptionThe Cypress CY25566 is a Spread Spectrum Clock Generator(SSCG) IC used for the pu

Page 3

CY25566Document #: 38-07429 Rev. *B Page 3 of 9SSCLK1a/bSSCLK1a and SSCLK1b are spread spectrum clock outputsused for the purpose of reducing EMI in

Page 4

CY25566Document #: 38-07429 Rev. *B Page 4 of 9Modulation RateSpread Spectrum clock generators utilize frequencymodulation (FM) to distribute energy

Page 5

CY25566Document #: 38-07429 Rev. *B Page 5 of 9 Table 1. Frequency and Bandwidth Selection Chart (Group 1)(Low Frequency (1x) Selection Chart)25–5

Page 6

CY25566Document #: 38-07429 Rev. *B Page 6 of 9Application SchematicIn this example, the CY25566 is being driven by a 75-MHzreference clock.S0 = 0 a

Page 7

CY25566Document #: 38-07429 Rev. *B Page 7 of 9Absolute Maximum Ratings[1, 2]Supply Voltage (VDD: ...

Page 8

CY25566Document #: 38-07429 Rev. *B Page 8 of 9© Cypress Semiconductor Corporation, 2002. The information contained herein is subject to change with

Page 9

CY25566Document #: 38-07429 Rev. *B Page 9 of 9Document Title:CY25566 Spread Spectrum Clock GeneratorDocument Number: 38-07429Rev. ECN No.Issue Date

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