CY22388ZXC-27

Clock Generators, PLLs, Frequency Synthesizers Overview

The CY22388ZXC-27 is a factory-programmable quad PLL clock generator with an integrated analog VCXO, designed for digital set-top box and DTV applications. It operates on a single 3.3-V supply and supports output frequencies from 1 MHz to 166 MHz. The device features four independent PLLs capable of synthesizing unrelated frequencies from a single crystal reference (10–30 MHz) or external clock (1–100 MHz). It includes up to eight clock outputs in 16-pin TSSOP, 20-pin TSSOP, or 32-pin QFN packages, with selectable 2.5-V output buffers for lower voltage swings.

Clock Generators, PLLs, Frequency Synthesizers Feature Summary

• Quad PLL architecture with integrated analog VCXO for ±120 ppm pull range
• Factory-programmable configuration for customized frequency sets
• Supports 16-pin TSSOP, 20-pin TSSOP, and 32-pin QFN packages
• Glitch-free frequency switching and selectable 2.5-V output buffers

Clock Generators, PLLs, Frequency Synthesizers Applications

• Digital set-top boxes
• DVD recorders
• Digital television (DTV) systems

Clock Generators, PLLs, Frequency Synthesizers Procurement Notes

This component is obsolete and no longer in production. Verification of availability requires checking secondary market sources or existing stock, as original manufacturer distribution has ceased. Factory programming was performed by Cypress Semiconductor prior to shipment; the specific programmed values for suffix -27 are not publicly documented.

Clock Generators, PLLs, Frequency Synthesizers Selection Notes

Select this device when a single-chip solution for multiple independent clock frequencies with VCXO tracking is required. Ensure the design utilizes a pullable crystal meeting specified ESR and capacitance parameters. Verify package compatibility (TSSOP/QFN) and confirm that the 3.3-V core voltage meets system power requirements.

Clock Generators, PLLs, Frequency Synthesizers Part Context

The CY22388 family includes CY22389 and CY22391 variants, differing primarily in pin count and output configurations. The CY22388 specifically offers up to five clock outputs in the 16-pin package. All variants share the same quad PLL and VCXO functionality but differ in available output pins and frequency select logic.

Clock Generators, PLLs, Frequency Synthesizers Replacement Considerations

No direct public substitutes are listed. Alternative clock generators with VCXO capabilities may require redesign of the PCB layout and firmware due to differences in pinout, control interfaces, and programming methods.

Clock Generators, PLLs, Frequency Synthesizers FAQ

What is the function of the VIN pin?

The VIN pin serves as the analog voltage-control input for the internal VCXO, allowing the crystal frequency to be pulled to track an external reference.

How are output frequencies selected?

Output frequencies are determined by the FS0, FS1, and FS2 pins, which select among predefined divider combinations programmed into the device at the factory.

Can the outputs drive 2.5-V logic levels?

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