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IMISM561

Part Number	IMISM561
Manufacturer	Cypress Semiconductor
Description	Spread Spectrum Clock Generator
Published	Sep 2, 2005
Detailed Description	SM561 Spread Spectrum Clock Generator Features • • • • • • • • • 54- to 166-MHz operating frequency range Wide (9) rang...
Datasheet	IMISM561 PDF File

Overview

SM561 Spread Spectrum Clock Generator Features • • • • • • • • • 54- to 166-MHz operating frequency range Wide (9) range of spread selections Accepts clock and crystal inputs Low power dissipation 3.
3V = 165 mw.
(Fin = 120 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 electromagnetic interference (EMI) reduction by 8 to 16 dB • Fast time to market • Cost reduction Block Diagram Pin Configuration 250 K Xin/CLK Xin/ CLK 1 4 pf REFERENCE DIVIDER PD CP LF 1 2 3 4 8 7 6 5 Xout S0 S1 SSCC VDD VSS MODULATION CONTROL SSCLK FEEDBACK DIVIDER VCO Xout 8 8 pF VDD VSS 2 INPUT DECODER LOGIC DIVIDER AND MUX 3 4 SSCLK 5 6 7 SSCC S1 S0 Cypress Semiconductor Corporation Document #: 38-07021 Rev.
*C • 3901 North First Street • San Jose, CA 95134 • 408-943-2600 Revised December 14, 2002 SM561 .
Pin Description Pin Number 1 2 3 4 5 Pin Name Xin/CLK VDD GND SSCLK SSCC Pin Type I P P O I Pin Description Clock or Crystal connection input.
Refer to Table 1 for input frequency range selection.
Positive power supply.
Power supply ground.
Modulated clock output.
Spread Spectrum Clock Control (Enable/Disable) function.
SSCG function is enabled when input is high and disabled when input is low.
This pin is pulled high internally.
Tri-level Logic input control pin used to select Frequency and Bandwidth.
Frequency/Bandwidth selection and Tri-level Logic programming.
See Figure 1 on page 3.
Tri-level Logic input control pin used to select Frequency and Bandwidth.
Frequency/Bandwidth selection and Tri-level Logic programming.
See Figure 1 on page 3.
Oscillator output pin connected to crystal.
Leave this pin unconnected If an external clock drives Xin/CLK.
6 S1 I 7 S0 I 8 Xout O General Description The Cypress SM561 is a Spread Spectrum Clock Generator (SSCG) IC used for the pur...

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