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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
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