CY25100SXC-052

Clock Generators, PLLs, Frequency Synthesizers Overview

The CY25100SXC-052 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 crystal load capacitance tuning arrays ranging from 12 pF to 60 pF, eliminating the need for external capacitors. The modulation frequency is fixed at 31.5 kHz, with center spread configurable from ±0.25% to ±2.5% and down spread from –0.5% to –5.0%. The component is 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, significantly reducing radiated electromagnetic interference energy.
• Features internal programmable crystal load capacitor tuning arrays that match specific crystal load requirements, removing the necessity for external load capacitors on the circuit board.
• Provides two distinct clock outputs: a non-modulated buffered reference clock identical to the input signal and a spread spectrum clock output for EMI mitigation.

Clock Generators, PLLs, Frequency Synthesizers Applications

• High-speed digital electronic systems requiring electromagnetic interference compliance
• LCD driver ICs utilizing spread spectrum techniques for noise reduction
• Embedded processor and controller clock generation

Clock Generators, PLLs, Frequency Synthesizers Procurement Notes

Verify the ordering code suffix against the manufacturer's documentation to confirm the specific configuration parameters. Factory-programmed devices utilize custom codes denoted by 'xxx' or 'xx', while field-programmable versions contain an 'F'. Ensure the selected variant matches the required temperature range and package type before procurement.

Clock Generators, PLLs, Frequency Synthesizers Selection Notes

Select this component when a low-cost solution is needed to replace multiple discrete crystals and oscillators. The device supports both crystal and external reference clock inputs, offering flexibility in system design. Consider the programmable load capacitance feature to simplify PCB layout and reduce component count.

Clock Generators, PLLs, Frequency Synthesizers Part Context

The CY25100 series belongs to Cypress Semiconductor's VersaClock family of programmable clock generators. This specific model focuses on EMI reduction through spread spectrum modulation. The SXC designation indicates an 8-pin SOIC package with commercial temperature ratings. The base part number identifies it as a field and factory programmable device.

Clock Generators, PLLs, Frequency Synthesizers Replacement Considerations

Direct replacements are not explicitly listed in the provided datasheet. Verify compatibility with alternative models such as the CY25200 or IDT 5P35021 based on pinout, voltage, and frequency specifications.

Clock Generators, PLLs, Frequency Synthesizers FAQ

What is the function of the CXIN and CXOUT pins?

These pins provide internal programmable load capacitance ranging from 12 pF to 60 pF. They eliminate the need for external crystal load capacitors by allowing the user to tune the internal capacitance to match the crystal's specified load.

How is the spread spectrum modulation controlled?

Modulation is controlled via the SSON# pin. Driving this pin LOW enables spread spectrum modulation, while driving it HIGH disables modulation, resulting in a nominal clock frequency without spreading.

Can the REFCLK output be disabled?

Yes, the reference clock output can be programmed to be enabled or disabled. If not required, it should be set to High Z (clock off) to minimize power consumption and potential interference.