CY25403SXC-009T

Clock Generators, PLLs, Frequency Synthesizers Overview

The CY25403SXC-009T is a three-phase locked loop (PLL) programmable clock generator with spread spectrum capability, manufactured by Cypress Semiconductor Corp. It operates within an 8 to 166 MHz input frequency range and synthesizes output frequencies from 3 to 166 MHz. The device supports VDD supply voltages of 2.5V, 3.0V, or 3.3V and features selectable output clock voltages independent of the supply voltage. It includes nonvolatile programming for PLL frequencies, drive strength, and modulation profiles. The component is housed in an 8-pin SOIC package and supports commercial temperature ranges.

Clock Generators, PLLs, Frequency Synthesizers Feature Summary

• Three fully integrated phase locked loops allow synthesis of unrelated frequencies from a single crystal.
• Programmable spread spectrum control with center and down spread options for EMI reduction.
• Glitch-free frequency switching capability ensures uninterrupted system operation during clock changes.
• Nonvolatile memory enables permanent storage of custom frequencies, drive strengths, and modulation settings.

Clock Generators, PLLs, Frequency Synthesizers Applications

• PC motherboard clock generation
• Consumer electronics timing synchronization
• Portable device power management clocks
• Networking equipment signal distribution

Clock Generators, PLLs, Frequency Synthesizers Procurement Notes

Verify the specific factory-programmed configuration suffix associated with the part number, as the base model requires custom programming for exact frequency outputs. Confirm that the ordering suffix matches the required tape and reel packaging format if applicable. Ensure the selected variant aligns with the intended operating temperature range and voltage specifications for the target application environment.

Clock Generators, PLLs, Frequency Synthesizers Selection Notes

Select this component when multiple independent clock frequencies are required from a single reference source. Consider the CY25403 for systems needing 2.5V, 3.0V, or 3.3V operation. Evaluate the CY25423 if a 1.8V supply is mandatory, or the CY25483 if external clock inputs require higher voltage levels. Verify that the required output drive strength and jitter specifications fall within the device's capabilities.

Clock Generators, PLLs, Frequency Synthesizers Part Context

This component belongs to the CY254xx series of programmable clock generators designed for EMI reduction and flexible frequency synthesis. It shares architectural similarities with the CY25423 and CY25483, differing primarily in supported supply voltages and input reference requirements. The series addresses complex system design timing needs across various industrial and consumer applications.

Clock Generators, PLLs, Frequency Synthesizers Replacement Considerations

Direct substitutes include the CY25423SXC-009T for 1.8V applications and the CY25483SXC-009T for high-voltage external clock inputs. Cross-model compatibility depends on verifying voltage levels and input source requirements against the original circuit design constraints.

Clock Generators, PLLs, Frequency Synthesizers FAQ

Can the CY25403 generate nonstandard frequencies?

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

What happens to the outputs during frequency switching?

The outputs remain glitch-free during frequency switching provided the switch is executed using the output dividers.

How is the spread spectrum feature controlled?

Spread spectrum can be enabled or disabled via the multifunction CLK3/SSON pin, allowing dynamic control over EMI reduction modes.