AN49107 Total System Timing and EMI Reduction Using CY254x Spread Spectrum Clock Generators | Cypress Semiconductor

AN49107 Total System Timing and EMI Reduction Using CY254x Spread Spectrum Clock Generators

Last Updated:

Mar 02, 2021

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AN49107 describes the features and advantages of the four phase-locked loop (PLL) ICs of the CY254x clock synthesizers. It also explains the EMI noise reduction technique using the spread spectrum method.

Several applications require a number of independent frequencies to be generated using clock generators. Crystals and clock generators with one or two PLLs limit this requirement. Moreover traditional methods (ferrite beads, filtering, and so on.) are followed for EMI reduction with compromise in design time and accuracy. These limitations and issues are overcome by using Cypress CY254XX and CY254X series.

Dear valued customer,

Thank you for choosing our products. They come with all the know-how and passion that our engineers have put into it. As you probably already know, Cypress is now Infineon. This is a major step for our company, but also for the good of you.

Reliability and business continuity are of utmost importance for us. Hence, we remain fully committed to honoring existing customer and distributor relationships. This includes offering the legacy Cypress product portfolio. We thank you very much for your trusting support.

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Related Files

File Title	Language	Size	Last Updated
AN49107 Total System Timing and EMI Reduction Using CY254x Spread Spectrum Clock Generators.pdf	English	664.7 KB	03/02/2021

Related Resources

Datasheets
CY2544/CY2546/CY2548, QUAD-PLL PROGRAMMABLE CLOCK GENERATOR WITH SPREAD SPECTRUM	11/14/2017
CY2545, CY2547: Quad PLL Programmable Spread Spectrum Clock Generator with Serial I2C Interface	11/14/2017

Application Notes
AN69091 - Edge Align Feature of CY254xx and MoBL® Clocks	07/10/2017