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Spread Spectrum Clock Generator
CY25562
Cypress Semiconductor Corporation
•
3901 North First Street
•
San Jose
•
CA 95134
•
408-943-2600
Document #: 38-07392 Rev. *B
Revised December 28, 2002
Features
• 50- to 200-MHz operating frequency range
• Wide range of spread selections (9)
• Accepts clock and crystal inputs
• Low power dissipation
• 3.3V = 70 mw. (Fin = 65 MHz)
• Frequency spread disable function
• Center spread modulation
• Low cycle-to-cycle jitter
• Eight-pin SOIC package
Applications
• High-resolution VGA controllers
• LCD panels and monitors
• Workstations and servers
Benefits
• Peak EMI reduction by 8 to 16 dB
• Fast time to market
• Cost reduction
Block Diagram
Pin Configuration
XIN/CLK
SSCLK
XOUT
CY25562
1
2
3
4
8
7
6
5
VDD
VSS
S0
S1
SSCC
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
VSS
Xout
Xin/
CLK
VDD
VDD
VSS
VSS
300K