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Spread Spectrum Clock Generator
CY25560
Cypress Semiconductor Corporation
•
3901 North First Street
•
San Jose
, CA 95134
•
408-943-2600
Document #: 38-07425 Rev. *D
Revised January 28, 2005
Features
• 25- to 100-MHz operating frequency range
• Wide (9) range of spread selections
• Accepts clock and crystal inputs
• Low power dissipation:
— 56 mW @ Fin = 25 MHz
— 89 mW @ Fin = 65 MHz
— 139 mW @ Fin = 100 MHz
• Frequency spread disable function
• Center spread modulation
• Low cycle-to cycle jitter
• 8-pin SOIC package
• Commercial and Industrial temperature ranges
Applications
• Desktop, notebook, and tablet PCs
• VGA controllers
• LCD panels and monitors
• Printers and multifunction devices (MFP)
Benefits
• Peak electromagnetic interference (EMI) reduction by 8 to
16 dB
• Fast time to market
• Cost reduction
Block Diagram
Pin Configuration
VSS
PD
REFERENCE
DIVIDER
Loop
Filter
1
2
MODULATION
CONTROL
INPUT
DECODER
LOGIC
FEEDBACK
DIVIDER
vco
DIVIDER
&
MUX
8
3
CP
SSCLK
S0
S1
6
7
5
4
20 K
20 K
20 K
20 K
SSCC
VDD
Xout
Xin/
CLK
VDD
VDD
VSS
VSS
250 K
1
2
3
4
8
7
6
5
XIN/CLK
VDD
VSS
XOUT
S0
S1
SSCC
CY25560
SSCLK
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