CY25566 Datasheet, PDF (1/9 Pages) Cypress Semiconductor – Spread Spectrum Clock Generator

CY25566
Spread Spectrum Clock Generator
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)
Block Diagram
• 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
Pin Configuration
Xin/
CLK
1
Xout 16
VDD 4
VSS 5
VSS 11
VSS 14
REFOFF
2
300K
3 REFOUT ^{XIN/CLKIN 1}
REFERENCE
DIVIDER
PD CP
Loop
Filter
REFOFF 2
REFOUT 3
VDD 4
MODULATION
CONTROL
FEEDBACK
DIVIDER
vco
INPUT
DECODER
LOGIC
VDD
VDD
DIVIDER
&
MUX
8 SSCLK1a
VSS 5
S2 6
S3 7
SSCLK1a ₈
9 SSCLK1b
20 K
20 K
VSS
10
SSCC
12 13
S1 S0
20 K
20 K
VSS
RANGE
CONTROL
67
S2 S3
/2
15 SSCLK2
16 XOUT
15 SSCLK2
14 VSS
13 S0
12 S1
11 VSS
10 SSCC
9 SSCLK1b
Cypress Semiconductor Corporation • 3901 North First Street • San Jose • CA 95134 • 408-943-2600
Document #: 38-07429 Rev. *A
Revised December 30, 2002