CY25100

The CY25100 is a Spread Spectrum Clock Generator (SSCG) IC used for the purpose of reducing EMI found in today's high-speed digital electronic systems.

The device uses a Cypress proprietary PLL and Spread Spectrum Clock (SSC) technology to synthesize and modulate the frequency of the input clock. By frequency modulating the clock, the measured EMI at the fundamental and harmonic frequencies are greatly reduced. This reduction in radiated energy can significantly reduce the cost of complying with regulatory agency (EMC) requirements and improve time-to-market without degrading system performance.

The CY25100 uses a factory/field-programmable configuration memory array to synthesize output frequency, spread%, crystal load capacitor, reference clock output on/off, spread spectrum on/off function and PD#/OE options.

The spread% is programmed to either center spread or down spread with various spread percentages. The range for center spread is from ±0.25% to ±2.50%. The range for down spread is from 0.5% to 5.0%. Contact the factory for smaller or larger spread % amounts if required.

The input to the CY25100 can be either a crystal or a clock signal. The input frequency range for crystals is 830 MHz, and for clock signals is 8166 MHz.

The CY25100 has two clock outputs, REFCLK and SSCLK. The non-spread spectrum REFCLK output has the same frequency as the input of the CY25100. The frequency modulated SSCLK output can be programmed from 3200 MHz.

The CY25100 products are available in an 8-pin SOIC and TSSOP packages with commercial and industrial operating temperature ranges.