CY22391LTXC-08

Clock Generators, PLLs, Frequency Synthesizers Overview

The CY22391LTXC-08 is a factory-programmable, quad PLL clock generator with an integrated analog VCXO. It operates on a 3.3 V supply and supports output frequencies from 1 MHz to 166 MHz. The device accepts crystal inputs between 10 MHz and 30 MHz or external references from 1 MHz to 100 MHz. It features four independent PLLs capable of generating up to eight clock outputs. The package is a 32-pin QFN (LT32) operating within a commercial temperature range of 0 °C to +70 °C.

Clock Generators, PLLs, Frequency Synthesizers Feature Summary

• Integrates four independent phase-locked loops for synthesizing multiple unrelated frequencies from a single reference source.
• Includes an analog voltage-control crystal oscillator (VCXO) that allows the system frequency to track shifting external references.
• Provides selectable output frequencies via programmable post dividers without modifying internal PLL configurations.

Clock Generators, PLLs, Frequency Synthesizers Applications

• Digital set top boxes
• DVD recorders
• DTV applications

Clock Generators, PLLs, Frequency Synthesizers Procurement Notes

This component is a factory-programmed device requiring specific configuration submission to the manufacturer. Verify the exact part number suffix against official ordering documentation to ensure correct programming parameters are applied before procurement.

Clock Generators, PLLs, Frequency Synthesizers Selection Notes

Select this model when a design requires multiple independent clock frequencies derived from a single crystal. Ensure the application utilizes a pullable crystal compatible with the ±120 ppm typical pull range required by the analog VCXO functionality.

Clock Generators, PLLs, Frequency Synthesizers Part Context

The CY22391LTXC-08 belongs to the CY22388 family of devices, which includes CY22388 and CY22389 variants. These devices share identical functional architectures but differ in pin counts and package options, such as 16-pin TSSOP, 20-pin TSSOP, and 32-pin QFN.

Clock Generators, PLLs, Frequency Synthesizers Replacement Considerations

CY22391LTXC-09

Clock Generators, PLLs, Frequency Synthesizers FAQ

How does the VCXO function within the CY22391LTXC-08?

The analog VCXO pulls the reference crystal higher or lower to lock the system frequency to an external source, providing infinite resolution on the pull curve without digital steps.

What is the maximum output frequency supported by the device?

The maximum output frequency is 166 MHz, which occurs in 'divide by 1' mode due to output buffer limitations.

Can the outputs be powered by a separate voltage supply?

Yes, selected clock outputs can be powered off a separate 2.5-V supply to drive lower voltage swing inputs, while the core circuitry remains at 3.3 V.