CY23FS04ZXI-3T

Clock Generators, PLLs, Frequency Synthesizers Overview

The CY23FS04ZXI-3T is a Failsafe zero delay buffer manufactured by Infineon Technologies (formerly Cypress Semiconductor). It features an internal digitally controlled crystal oscillator (DCXO) for continuous glitch-free operation. The device provides four phase-aligned outputs with zero input-output propagation delay and low jitter of 35 ps max RMS. It supports reference inputs from 4.17 MHz to 166.7 MHz and delivers outputs up to 166.7 MHz. Operating voltages include 2.5 V or 3.3 V for VDD and 3.3 V for the core supply VDDC. It is housed in a 16-pin TSSOP package and operates within an industrial temperature range of -40 °C to +85 °C.

Clock Generators, PLLs, Frequency Synthesizers Feature Summary

• Internal digitally controlled crystal oscillator maintains frequency and phase during reference clock failure
• Zero input-to-output propagation delay with phase-aligned outputs
• Dual reference inputs with selectable active source
• Low output-to-output skew ensuring precise timing alignment

Clock Generators, PLLs, Frequency Synthesizers Applications

• Clock distribution systems requiring uninterrupted operation
• Applications needing continuous glitch-free clock signals
• Systems utilizing industry standard input crystals

Clock Generators, PLLs, Frequency Synthesizers Procurement Notes

Verify the ordering suffix 'T' indicates tape and reel packaging configuration. Confirm the 'I' suffix corresponds to the industrial temperature grade ranging from -40 °C to +85 °C. Ensure the specific part number matches the required voltage and package specifications before procurement.

Clock Generators, PLLs, Frequency Synthesizers Selection Notes

Select this component when zero delay buffering and failover capability are critical. Verify that the external crystal frequency is an integer factor of the desired reference clock frequency. Check that the load capacitance requirements align with the specified 15 pF maximum for high-frequency outputs.

Clock Generators, PLLs, Frequency Synthesizers Part Context

This device belongs to the Failsafe family of zero delay buffers designed for robust clock management. It integrates a DCXO to serve as a redundant clock source, synchronizing with external references when available. The architecture simplifies system design by eliminating complex switching circuitry typically required for redundancy.

Clock Generators, PLLs, Frequency Synthesizers Replacement Considerations

Direct replacements must support the same 16-pin TSSOP package and industrial temperature range. Verify compatibility with 2.5 V/3.3 V output supplies and 3.3 V core supply. Ensure the substitute offers comparable jitter performance and DCXO functionality for failover applications.

Clock Generators, PLLs, Frequency Synthesizers FAQ

How does the device handle reference clock failure?

The internal DCXO maintains the last known frequency and phase information, providing continuous glitch-free operation while the FAIL#/SAFE pin indicates the failure status.

What is the relationship between the crystal frequency and the reference clock?

The crystal frequency connected to the DCXO must be an integer factor of the reference clock frequency, determined by the S select lines.

Can the device operate without an external reference clock?

Yes, the PLL and DCXO bypass mode allows operation, though normal synchronization requires a valid reference input within the capture range.