Quad PLL Programmable Clock Generator With Spread Spectrum

The CY2544 and CY2546 are four-PLL programmable Spread Spectrum Clock Generators used to reduce EMI found in high-speed digital electronic systems. Two of the four PLLs have Spread Spectrum capability. The spread spectrum feature is turned on or off using the control pin SSON. The advantage of having four PLLs is that a single device CAN generate up to four independent families of frequencies from a single crystal or reference input frequency. Generally, a design requires up to four Oscillators to achieve the same result as a single CY2544 or CY2546. By Cypress Semiconductor Corp.