CY24488ZXC

Clock Generators, PLLs, Frequency Synthesizers Overview

The CY24488 is a quad-PLL clock generator featuring a two-wire serial interface. It synthesizes three independent output frequencies plus a buffered reference copy from a single 27 MHz crystal or external clock input. The device supports an optional analog VCXO for frequency pulling via the VIN pin, offering a typical pull range of ±120 ppm. Output drive strength is programmable to minimize EMI, and outputs operate at 3.3 V or 2.5 V. It is housed in a 16-pin TSSOP package.

Clock Generators, PLLs, Frequency Synthesizers Feature Summary

• Generates up to three independent synthesized clock frequencies and a buffered reference output using four PLLs.
• Configurable via a two-wire serial interface (I2C-compatible) for in-system programming of frequencies and settings.
• Includes an analog VCXO controlled by an external voltage on the VIN pin to fine-tune output frequencies.
• Features programmable output drive strength settings to optimize performance and reduce electromagnetic interference.

Clock Generators, PLLs, Frequency Synthesizers Applications

• Digital Set Top Box
• DVD Recorder
• DTV (Digital Television)
• HDMI Audio/Video Systems
• USB Host Controllers

Clock Generators, PLLs, Frequency Synthesizers Procurement Notes

Verify the specific ordering suffix against Infineon's current catalog to ensure availability and compliance with RoHS standards. Confirm that the required load capacitance matches the programmed register values if using a standard crystal without VCXO functionality. Ensure the serial interface address matches the system design requirements.

Clock Generators, PLLs, Frequency Synthesizers Selection Notes

Select this component when multiple unrelated clock frequencies are required from a single reference source. Choose the VCXO variant only if precise frequency pulling is necessary; otherwise, disable the feature to relax crystal specifications. Verify that the target application frequencies fall within the supported range of 4.9152 MHz to 148.5 MHz.

Clock Generators, PLLs, Frequency Synthesizers Part Context

The CY24488 belongs to the Cypress Semiconductor clock generator family, now managed by Infineon Technologies. It serves as a direct replacement for non-serial variants like the CY22388 series but adds flexible in-system configuration capabilities. The device is designed for high-performance multimedia applications requiring precise clock synthesis.

Clock Generators, PLLs, Frequency Synthesizers Replacement Considerations

The datasheet identifies the CY22388/89/91 as the equivalent parts without a serial port. These can be used if dynamic reconfiguration is not required. Verify pin compatibility and electrical specifications before substitution.

Clock Generators, PLLs, Frequency Synthesizers FAQ

How is the VCXO feature disabled?

To disable the VCXO, tie the VIN pin to AVDD and program the appropriate register values into the device to select a standard crystal mode.

What is the default state upon power-up?

Upon power-up, all output clocks are off except CLKG, which outputs a copy of the 27 MHz reference clock. The serial programming memory is volatile and must be reconfigured after power cycling.

Can CLKF and CLKG outputs generate different frequencies?

No, CLKF and CLKG cannot generate independent synthesized frequencies. They can only output a copy of CLKC, CLKD, CLKE, or the 27 MHz reference clock.