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CY25566

Part Number	CY25566
Manufacturer	Cypress Semiconductor
Description	Spread Spectrum Clock Generator
Published	Aug 8, 2011
Detailed Description	CY25566 Spread Spectrum Clock Generator Features • • • • 25- to 200-MHz operating frequency range Wide range of spread ...
Datasheet	CY25566 PDF File

Overview

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 enables REFOUT clock at pin 3.
REFOFF 400KΩ internal pull-up resistor.
Logic “0” enables REFOUT, logic “1” disables REFOUT.
Default = disabled.
Buffered, non-modulated output clock derived from XIN/CLKIN input frequency.
There is a 180° phase shift from XIN to REFOUT.
Positive power supply.
Bypass to ground with 0.
1-µF capacitor.
Positive power supply ground.
VCO range control.
Refer to Table 1, Table 2, and Table 3 for detailed programming information.
Has 400-KΩ internal pull-up to VDD.
VCO range ...

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