Spread Spectrum Clock Generator
CY25566
Spread Spectrum Clock Generator
Features
• • • • 25- to 200-MHz operating frequency range Wide range of spread ...
Description
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) 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
REFOFF 2
300K
3 REFOUT Xin/ CLK 1 REFERENCE DIVIDER
XIN/CLKIN REFOFF
1 2
16 15
XOUT SSCLK2 VSS
PD
CP
Loop Filter
REFOUT VDD
3 4 5 6 7 8
CY25566
14
13 S0 12 S1 11 VSS
Xout 16
VSS
MODULATION CONTROL FEEDBACK DIVIDER
vco
S2 S3 SSCLK1a
10 SSCC 9 SSCLK1b
VDD 4
INPUT DECODER LOGIC
VDD VDD
DIVIDER & MUX
8 SSCLK1a 9 SSCLK1b /2 15 SSCLK2
VSS 5 VSS 11 VSS 14
20 K
20 K
RANGE CONTROL
20 K
VSS
20 K
VSS
10 SSCC
12 S1
13 S0
6 S2
7 S3
Cypress Semiconductor Corporation
www.DataSheet4U.net Document #: 38-07429 Rev. *B
3901 North First Street
San Jose
CA 95134 408-943-2600 Revised October 26, 2005
CY25566
Pin Description
Pin 1 2 3 4 5, 11, 14 6 7 8 9 10 Name XIN/CLKIN REFOFF REFOUT VDD VSS S2 S3 SSCLK1a SSCLK1b SSCC Type I I O P G I I O O I Description Clock or Crystal connection input. Refer to Table 1, Table 2, and Table 3 for input frequency range selection. Input pin enab...
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