CY2545QI

Clock Generators, PLLs, Frequency Synthesizers Overview

The CY2545QI is a quad-PLL programmable spread spectrum clock generator featuring four independent phase-locked loops and an I2C serial interface. It synthesizes output frequencies from 3 to 166 MHz using external crystals (8–48 MHz) or reference clocks (8–166 MHz). The device supports VDD supply voltages of 2.5 V, 3.0 V, or 3.3 V with selectable output driver levels. It includes glitch-free frequency switching, spread spectrum modulation for EMI reduction, and operates within commercial (0°C to +70°C) and industrial (-40°C to +85°C) temperature ranges.

Clock Generators, PLLs, Frequency Synthesizers Feature Summary

• Four fully integrated PLLs enable synthesis of unrelated frequencies from a single crystal source.
• Serial I2C programming allows configuration of output dividers, drive strength, and spread spectrum characteristics.
• Programmable spread spectrum with center and down spread options reduces electromagnetic interference.
• Glitch-free frequency switching ensures uninterrupted system operation during clock transitions.

Clock Generators, PLLs, Frequency Synthesizers Applications

• PC motherboard clock generation
• Consumer electronics timing
• Portable device synchronization
• Networking equipment clock distribution

Clock Generators, PLLs, Frequency Synthesizers Procurement Notes

Verify the specific suffix 'QI' against official Infineon ordering information to confirm package type and temperature range. Ensure the required voltage domain matches the CY2545 specifications. Confirm availability status as product lifecycles may change. Cross-reference the datasheet revision for accurate electrical parameters before finalizing procurement.

Clock Generators, PLLs, Frequency Synthesizers Selection Notes

Select this component when multiple independent clock frequencies are required from a single input source. Verify that the target system requires the specific voltage levels supported by the CY2545 variant. Consider the I2C interface compatibility with the host controller. Evaluate the need for spread spectrum capabilities for EMI compliance in the design.

Clock Generators, PLLs, Frequency Synthesizers Part Context

This part belongs to the CY2545/CY2547 family of quad-PLL clock generators. The CY2545 series is designed for higher voltage applications compared to the low-voltage CY2547. Both share similar functional architectures but differ in supply voltage requirements and output driver capabilities.

Clock Generators, PLLs, Frequency Synthesizers Replacement Considerations

Check for direct pin-compatible alternatives within the same family. Verify if other manufacturers offer equivalent quad-PLL synthesizers with compatible I2C interfaces. Ensure substitute parts meet the same frequency and jitter specifications.

Clock Generators, PLLs, Frequency Synthesizers FAQ

Can the CY2545 generate nonstandard frequencies?

Yes, the device features Fractional-N capability, allowing it to synthesize nonstandard frequencies with zero PPM error.

How is spread spectrum controlled?

Spread spectrum can be enabled or disabled via the CLK6/SSON multifunction pin or programmed through the I2C interface.

What happens during a frequency switch?

The device provides glitch-free outputs when switching frequencies using output dividers, ensuring continuous system operation.