CY25100ZXI057

Clock Generators, PLLs, Frequency Synthesizers Overview

The CY25100ZXI057 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 industrial temperature range of -40°C to +85°C. The device synthesizes output frequencies from 3 MHz to 200 MHz using an integrated PLL. Input sources 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 external capacitors. The SSCLK output supports center spread (±0.25% to ±2.5%) and down spread (-0.5% to -5.0%) with a nominal modulation frequency of 31.5 kHz.

Clock Generators, PLLs, Frequency Synthesizers Feature Summary

• Integrated phase-locked loop synthesizes spread spectrum clock outputs to reduce electromagnetic interference peaks.
• Programmable internal crystal load capacitor array removes the requirement for discrete external load capacitors.
• Configurable power management allows selection between active-low power-down and active-high output enable functions.

Clock Generators, PLLs, Frequency Synthesizers Applications

• High-speed digital systems requiring EMI compliance
• LCD driver circuits utilizing spread spectrum techniques
• Embedded solutions needing programmable clock generation

Clock Generators, PLLs, Frequency Synthesizers Procurement Notes

Verify the specific configuration code '057' against official ordering documentation to confirm programmed parameters such as output frequency and spread percentage. Confirm package type matches the required PCB footprint. Ensure compatibility with the CY3672 programmer if field reprogramming is necessary. Check RoHS status and moisture sensitivity levels prior to assembly.

Clock Generators, PLLs, Frequency Synthesizers Selection Notes

Select this component when design requirements demand flexible clock synthesis with adjustable spread spectrum characteristics. The integrated load capacitor tuning simplifies schematic design by removing external components. Verify that the input frequency range and desired output modulation settings align with the device's programmable limits. Consider thermal resistance values for heat dissipation in the chosen package.

Clock Generators, PLLs, Frequency Synthesizers Part Context

This part belongs to the CY25100 family of spread spectrum clock generators manufactured by Cypress Semiconductor. The 'Z' suffix indicates an 8-pin TSSOP package, while 'I' denotes the industrial temperature rating. The 'F' designation typically signifies field-programmable capability, allowing post-manufacturing configuration changes via dedicated programming tools.

Clock Generators, PLLs, Frequency Synthesizers Replacement Considerations

Direct replacements include other CY25100 variants with matching package and temperature ratings, such as CY25100ZXIxxx. Cross-family substitutes like the CY25200 offer similar functionality but may differ in pinout or feature sets. Verify electrical characteristics and programming methods before substitution.

Clock Generators, PLLs, Frequency Synthesizers FAQ

What is the function of the CXIN and CXOUT pins?

These pins provide access to the programmable internal crystal load capacitor array, allowing users to tune capacitance from 12 pF to 60 pF to match crystal specifications without external capacitors.

How is the spread spectrum modulation controlled?

Modulation is controlled via the SSON# pin; driving it low enables spread spectrum, while driving it high disables modulation, resulting in a static clock output.

Can the CY25100ZXI057 be reprogrammed after installation?

Yes, if designated as field-programmable, it can be reprogrammed up to 100 times using the CY3672 programmer and appropriate socket adapters.