CY25560SXCT

Clock Generators, PLLs, Frequency Synthesizers Overview

The CY25560SXCT is a spread spectrum clock generator (SSCG) IC designed to reduce electromagnetic interference (EMI) in high-speed digital systems. It operates within a frequency range of 25 MHz to 100 MHz and accepts both crystal and external clock inputs. The device utilizes a proprietary phase-locked loop (PLL) to synthesize and frequency-modulate the reference clock, distributing energy over a controlled bandwidth to lower peak radiated emissions. It features nine digitally selectable spread percentage options via tri-level logic on S0 and S1 pins, along with an enable/disable function through the SSCC pin. Powered by a single 3.3 V supply, it dissipates between 56 mW and 139 mW depending on the input frequency. The component is housed in an 8-pin SOIC package and supports commercial temperature ranges from 0 °C to 70 °C.

Clock Generators, PLLs, Frequency Synthesizers Feature Summary

• Proprietary PLL technology for low cycle-to-cycle jitter and EMI reduction
• Tri-level logic control for selecting nine distinct spread percentage ranges
• Flexible input support for both crystals and external clock signals
• Dedicated SSCC pin for enabling or disabling spread spectrum modulation

Clock Generators, PLLs, Frequency Synthesizers Applications

• Desktop, notebook, and tablet PCs
• VGA controllers
• LCD panels and monitors
• Printers and multifunction devices (MFP)

Clock Generators, PLLs, Frequency Synthesizers Procurement Notes

Verify that the ordering suffix 'T' corresponds to the tape and reel packaging format required for automated assembly processes. Confirm the absence of an 'I' suffix to ensure the component meets the specified commercial operating temperature range of 0 °C to 70 °C rather than the industrial grade. Cross-reference the datasheet revision history to confirm compatibility with current design specifications.

Clock Generators, PLLs, Frequency Synthesizers Selection Notes

Select this component when designing systems requiring EMI compliance without additional shielding. Ensure the application frequency falls within the 25 MHz to 100 MHz operational window. Verify that the power supply voltage remains stable at 3.3 V ± 10%. Consider the thermal resistance characteristics if the device will operate near the upper limit of the commercial temperature range.

Clock Generators, PLLs, Frequency Synthesizers Part Context

This part belongs to the CY25560 family of spread spectrum clock generators originally developed by Cypress Semiconductor Corporation. Following Infineon Technologies' acquisition of Cypress, the product line continues under the Infineon portfolio. The base device remains identical, with variations primarily defined by packaging formats and temperature ratings.

Clock Generators, PLLs, Frequency Synthesizers Replacement Considerations

CY25560SXC: Identical functional specifications but supplied in tube packaging instead of tape and reel.

Clock Generators, PLLs, Frequency Synthesizers FAQ

How does the CY25560SXCT handle unused control pins?

Pins S0 and S1 feature internal resistor divider networks that default to a Middle (M) logic state if left unconnected. This allows for flexible configuration without requiring external pull-up or pull-down resistors.

What is the purpose of the Xout pin when using an external clock?

When driving the Xin/CLK pin with an external clock signal, the Xout pin must be left unconnected. It is only utilized when connecting an external crystal oscillator.

How is the modulation rate determined in this device?

The modulation rate is determined by the input clock frequency and a fixed internal divider count of 1166. The transition time between maximum and minimum frequencies defines the modulation period.