CY25100SXC-065

Clock Generators, PLLs, Frequency Synthesizers Overview

The CY25100SXC-065 is a field and factory programmable spread spectrum clock generator designed for EMI reduction. It operates on a single 3.3 V supply within the commercial temperature range of 0 °C to 70 °C. The device synthesizes output frequencies from 3 MHz to 200 MHz using an integrated PLL. Input options include external crystals (8–30 MHz) or reference clocks (8–166 MHz). It features programmable center spread (±0.25% to ±2.5%) and down spread (-0.5% to -5.0%) with a nominal modulation frequency of 31.5 kHz. The IC provides two outputs: SSCLK and REFCLK, housed in an 8-pin SOIC package.

Clock Generators, PLLs, Frequency Synthesizers Feature Summary

• Integrates a proprietary Phase-Locked Loop and Spread Spectrum Clock technology to synthesize and modulate input clock frequencies, reducing radiated electromagnetic interference energy peaks.
• Features internal programmable crystal load capacitor tuning arrays ranging from 12 pF to 60 pF, eliminating the need for external capacitors on the XIN and XOUT pins.
• Supports configurable power management through selectable Power Down or Output Enable functions via the PD#/OE pin, allowing control over oscillator and PLL states.

Clock Generators, PLLs, Frequency Synthesizers Applications

• High-speed digital electronic systems requiring electromagnetic interference mitigation
• LCD driver circuits utilizing spread spectrum techniques for noise reduction
• Embedded systems needing replacement for multiple discrete crystals and oscillators

Clock Generators, PLLs, Frequency Synthesizers Procurement Notes

Verify the specific configuration suffix '065' against official Infineon/Cypress ordering documentation to confirm the exact programmed parameters. Factory-programmed variants require submission of requests to local sales representatives. Ensure compatibility with the 8-pin SOIC footprint and 3.3 V logic levels during component sourcing.

Clock Generators, PLLs, Frequency Synthesizers Selection Notes

Select this component when design requirements specify a 3.3 V operating voltage and commercial temperature range. The device supports both crystal and reference clock inputs, offering flexibility in system architecture. Consider the programmable load capacitance feature to simplify PCB layout by removing external components. Verify that the required spread percentage falls within the specified center or down spread ranges.

Clock Generators, PLLs, Frequency Synthesizers Part Context

The CY25100 series belongs to Cypress Semiconductor's VersaClock family of programmable clock generators. This specific model utilizes Flash-based memory, enabling field reprogrammability up to 100 times. The SXC designation indicates an 8-pin SOIC package with commercial temperature ratings. The part integrates spread spectrum capabilities directly into the PLL architecture for efficient EMI suppression.

Clock Generators, PLLs, Frequency Synthesizers Replacement Considerations

Direct replacements include other CY25100 variants such as CY25100SXCF or CY25100ZXIF, depending on package and temperature requirements. Cross-family alternatives like the 5P35021 offer similar functionality but may differ in programming interfaces and jitter specifications. Always verify electrical characteristics and pinout compatibility before substitution.

Clock Generators, PLLs, Frequency Synthesizers FAQ

What is the function of the CXIN and CXOUT pins?

These pins provide access to the internal programmable crystal load capacitor tuning array. They allow the user to match the internal capacitance to the crystal's load requirement, typically ranging from 12 pF to 60 pF, thereby removing the need for external load capacitors.

How does the SSON# pin operate?

The SSON# pin acts as a digital control input for the spread spectrum function. When driven LOW, spread spectrum modulation is enabled on the SSCLK output. When driven HIGH, modulation is stopped, and the output remains at the nominal synthesized frequency.

Can the REFCLK output be disabled?

Yes, the REFCLK output can be programmed to be either enabled or disabled. If disabled, the output enters a High-Z state. Disabling unused outputs is recommended to reduce power consumption and potential noise coupling.