CY25811ZXCT

Clock Generators, PLLs, Frequency Synthesizers Overview

The CY25811ZXCT is a Spread Spectrum Clock Generator (SSCG) manufactured by Cypress Semiconductor Corporation. It operates on a single 3.3V supply and accepts input frequencies between 4 MHz and 32 MHz via clock, crystal, or resonator inputs. The device provides 1x frequency multiplication at the SSCLK output pin. It supports Center and Down spread modulation with selectable percentages controlled by digital inputs. Key electrical parameters include a maximum cycle-to-cycle jitter of 480 ps at 8 MHz and 400 ps at 16 MHz. Power dissipation is typically 52 mW at 6 MHz and 60 mW at 12 MHz under 3.3V operation.

Clock Generators, PLLs, Frequency Synthesizers Feature Summary

• Utilizes proprietary phase-locked loop technology to synthesize and modulate input clock frequencies for EMI reduction.
• Configurable 3-Level digital inputs allow selection of spread percentage and modulation type without external resistors.
• Accepts multiple input sources including crystals, ceramic resonators, and direct clock signals.
• Available in 8-pin SOIC and TSSOP packages suitable for commercial and industrial temperature ranges.

Clock Generators, PLLs, Frequency Synthesizers Applications

• Printers and MFPs
• LCD panels
• Digital copiers
• Networking LAN and WAN systems
• Embedded digital systems

Clock Generators, PLLs, Frequency Synthesizers Procurement Notes

Verify the specific suffix 'ZXCT' corresponds to the 8-pin TSSOP package and Tape & Reel configuration as listed in the official ordering information. Confirm that the required operating temperature range matches the Commercial grade specifications provided in the datasheet. Ensure the design accommodates the 3.3V supply voltage requirements and the specific load capacitance limits for the output stage.

Clock Generators, PLLs, Frequency Synthesizers Selection Notes

Select the CY25811 variant specifically when a 1x frequency multiplication ratio is required relative to the input signal. Verify that the desired output frequency falls within the 4 MHz to 32 MHz range supported by this specific model. Consider the CY25812 or CY25814 if higher multiplication factors such as 2x or 4x are necessary for the target application frequency.

Clock Generators, PLLs, Frequency Synthesizers Part Context

This component belongs to the CY25811/12/14 family of Spread Spectrum Clock Generators. While sharing identical input frequency ranges and control logic, the CY25811 is distinguished by its fixed 1x multiplication factor. Other members of the series offer different multiplication ratios to achieve higher output frequencies from the same crystal inputs.

Clock Generators, PLLs, Frequency Synthesizers Replacement Considerations

Direct functional substitutes within the same family include the CY25812ZXCT and CY25814ZXCT. These parts share the same package and control interface but provide 2x and 4x multiplication respectively. Verify that the increased output frequency generated by these alternatives does not exceed the input specifications of the downstream system components.

Clock Generators, PLLs, Frequency Synthesizers FAQ

How is the middle logic level configured for the S0 and S1 pins?

The middle logic level is achieved by leaving the S0 and S1 pins unconnected (floating), utilizing internal resistor dividers.

What is the maximum cycle-to-cycle jitter specification at 16 MHz?

The maximum cycle-to-cycle jitter is specified as 400 ps when the input frequency is 16 MHz.

Can the device accept a ceramic resonator as an input source?

Yes, the XIN pin accepts clock signals, crystals, and ceramic resonators within the 4 to 32 MHz range.