CY25701FLXIT

Overview

The CY25701FLXIT is a programmable high-frequency crystal oscillator manufactured by Infineon Technologies (formerly Cypress Semiconductor). It supports both Spread Spectrum Crystal Oscillator (SSXO) and No Spread Spectrum (XO) configurations. The device synthesizes output frequencies ranging from 10 MHz to 166 MHz using an integrated phase-locked loop. Key electrical parameters include a 3.3 V supply voltage, a maximum load capacitance of 15 pF, and a typical cycle-to-cycle jitter of 85 ps at 133 MHz. It operates within an industrial temperature range of –40 °C to +85 °C.

Feature Summary

• Programmable spread spectrum with center spread (±0.25% to ±2.0%) or down spread (–0.5% to –4.0%) options for EMI reduction.
• Integrated PLL synthesizes output clock frequencies from 10 MHz to 166 MHz.
• Field-programmable configuration memory allows customization of frequency and spread percentage via third-party programmers.
• Active HIGH Output Enable (OE) function for asynchronous control.

Applications

• PC systems
• Consumer electronics
• Networking applications

Procurement Notes

Verify the specific programming dash code assigned to the part number, as the 'zzz' suffix indicates factory-assigned data based on customer requirements. Confirm that the required output frequency and spread percentage match the programmed values, as these are fixed after manufacturing. Ensure compatibility with field-programming tools if reconfiguration is needed before final deployment.

Selection Notes

Select the CY25701FLXIT when EMI reduction through frequency modulation is required in digital systems. Choose this component over standard oscillators if regulatory compliance testing requires spread spectrum techniques. Verify that the target system supports the 3.3 V logic levels and the 4-pin ceramic LCC SMD package footprint.

Part Context

This component belongs to the CY25701 family of programmable timing devices. The 'FLX' suffix denotes a field-programmable version intended for distribution partners or customers using external programming kits like the CY3672-USB. The 'I' suffix specifies the industrial temperature grade, distinguishing it from commercial variants.

Replacement Considerations

Direct replacements require matching the 4-pin Ceramic LCC SMD package and 3.3 V operation. Verify that alternative devices support the same programmable frequency range (10–166 MHz) and spread spectrum capabilities. Check pinout compatibility, specifically the OE and SSCLK pin assignments.

FAQ

What is the default frequency modulation rate?

The default frequency modulation is programmed at 31.5 kHz for all SSCLK frequencies from 10 to 166 MHz.

How is the output enable function controlled?

The Output Enable (OE) pin is active HIGH. When OE is set to 1, the SSCLK output is enabled; when OE is 0, the output enters a high-impedance state.

Can the spread spectrum be disabled?

Yes, the device can be configured as a standard Crystal Oscillator (XO) with no spread by entering ±0.0% spread percentage during programming.