CY25404ZXI231T

Clock Generators, PLLs, Frequency Synthesizers Overview

The CY25404ZXI231T is a quad PLL programmable clock generator with spread spectrum capability, housed in a 20-pin TSSOP package. It supports input frequencies from 8 to 48 MHz via crystal or 8 to 166 MHz via external clock. The device synthesizes output frequencies ranging from 3 to 166 MHz across nine outputs grouped into three independent voltage banks (1.8 V, 2.5 V, 3.0 V, or 3.3 V). Operating within the industrial temperature range of -40 °C to +85 °C, it features glitch-free frequency switching and one-time programmability for customized configurations.

Clock Generators, PLLs, Frequency Synthesizers Feature Summary

• Four fully integrated phase-locked loops enable synthesis of up to four independent frequencies from a single reference source.
• Programmable spread spectrum control on two PLLs allows EMI reduction using center or down modulation profiles.
• Nine clock outputs are organized into three separate driver banks, each supporting independent supply voltage selection.
• Glitch-free frequency switching ensures uninterrupted system operation during dynamic clock transitions.

Clock Generators, PLLs, Frequency Synthesizers Applications

• PC motherboard clock distribution
• Consumer electronics timing synchronization
• Portable device power management systems
• Networking equipment signal generation

Clock Generators, PLLs, Frequency Synthesizers Procurement Notes

Verify that the ordering suffix 'I' confirms the industrial temperature rating (-40 °C to +85 °C) and 'T' indicates tape and reel packaging. Confirm the specific factory-programmed configuration associated with the '231' code matches the required frequency set. Ensure compatibility with the 20-pin TSSOP footprint during procurement planning.

Clock Generators, PLLs, Frequency Synthesizers Selection Notes

Select this component when multiple independent clock frequencies are required from a single oscillator source. Verify that the target output voltage levels align with the available bank settings (1.8 V, 2.5 V, 3.0 V, or 3.3 V). Ensure the application environment falls within the specified industrial temperature range and that glitch-free switching meets system stability requirements.

Clock Generators, PLLs, Frequency Synthesizers Part Context

This part belongs to the CY25404 family of quad PLL clock generators. The 'ZXI' designation identifies the 20-pin TSSOP package variant with industrial temperature grading. The suffix '231' denotes a specific factory-programmed configuration of frequencies and spread spectrum parameters, distinguishing it from generic or other custom-coded variants in the series.

Clock Generators, PLLs, Frequency Synthesizers Replacement Considerations

Direct replacements must match the quad PLL architecture and 20-pin TSSOP package. Verify that substitute devices support the same input frequency ranges and output voltage bank independence. Ensure equivalent spread spectrum capabilities and glitch-free switching performance if those features are critical to the design.

Clock Generators, PLLs, Frequency Synthesizers FAQ

Can the CY25404 generate four completely different frequencies simultaneously?

Yes, the device contains four independent PLLs, allowing it to synthesize up to four distinct output frequencies from a single input reference.

What is the maximum output frequency supported by the CY25404?

The device supports output frequencies up to 166 MHz when powered by 2.5 V, 3.0 V, or 3.3 V supplies.

How does the device handle frequency changes during operation?

It provides glitch-free frequency switching when changing frequencies via output dividers, ensuring continuous system operation without timing errors.