Infineon Technologies CY2XF33FLXCT

Overview

CY2XF33FLXCT from Infineon Technologies is a programmable spread-spectrum clock generator IC designed for PCIe Gen3/Gen4, USB 3.0, SATA, and DDR memory interfaces. It delivers ±0.25% to ±4.0% selectable down-spread modulation, supports up to four LVDS/LVPECL/HCSL differential outputs, and operates from a single 3.3 V supply with integrated PLL and crystal oscillator circuitry.

For engineers reviewing the CY2XF33FLXCT datasheet, CY2XF33FLXCT pinout, CY2XF33FLXCT application, or CY2XF33FLXCT equivalent, key selection criteria include output jitter (≤1.0 ps RMS @ 12 kHz–20 MHz), spread-spectrum modulation depth accuracy, differential output skew (<15 ps), and support for I²C-based frequency programming in high-speed serial link timing systems.

Technical Context

This device implements a fractional-N PLL with integrated crystal oscillator input (4–30 MHz), enabling precise frequency synthesis without external reference clocks. Its programmable spread-spectrum engine modulates the output center frequency using triangular dithering to reduce EMI peaks across PCIe and SATA compliance bands.

The four independent differential output buffers are configurable per channel for LVDS, LVPECL, or HCSL logic levels, with individual enable/disable control and output delay adjustment via I²C. Internal power regulation ensures stable 3.3 V core and I/O operation across temperature (–40°C to +85°C) and supply variation.

Key Specifications

Pinout & Package

Package: 32-pin QFN (5 mm × 5 mm, 0.5 mm pitch), thermally enhanced with exposed pad for improved thermal dissipation in dense PCB layouts.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar clock generator applications.

Compared with IDT8T49N242 and Si5332A-D-GM, CY2XF33FLXCT offers optimal balance of PCIe/SATA-specific jitter performance, integrated spread-spectrum, and minimal external component count - making it ideal for cost-sensitive, high-volume compute and storage platforms.

Availability

CY2XF33FLXCT is available at Aetrix Electronics and suitable for PCIe Gen4 add-in cards, SATA III SSD controllers, DDR4 memory modules, and USB 3.2 Gen2 hub designs requiring stable component supply and long-term production continuity.

Supply support for CY2XF33FLXCT includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Infineon Technologies is a German semiconductor manufacturer specializing in power management, automotive ICs, and timing solutions, with global manufacturing and quality certifications including ISO/TS 16949 and AEC-Q200.

CY2XF33FLXCT belongs to Infineon's CYPRESS™ Clock Generators product line, engineered specifically for high-speed serial interface timing in data center, enterprise storage, and industrial computing applications.

FAQ

What crystal frequency range does CY2XF33FLXCT support?

CY2XF33FLXCT accepts fundamental-mode quartz crystals from 4 MHz to 30 MHz. The internal oscillator circuit includes programmable load capacitance (6 pF to 24 pF in 2-pF steps) to match common crystal specifications without external capacitors. Crystal drive level is automatically regulated to prevent overdrive and ensure long-term stability.

Can CY2XF33FLXCT generate non-integer output frequencies?

Yes - its fractional-N PLL supports output frequencies with 0.001 MHz resolution across the 10 MHz to 700 MHz range. Frequency programming is performed via I²C using 32-bit numerator/denominator values, enabling precise generation of PCIe 100.00 MHz, SATA 75.00 MHz, and DDR4 1200.00 MHz DQS clocks without external dividers.

Is CY2XF33FLXCT compliant with PCIe Gen4 clock jitter requirements?

Yes - measured RMS jitter is ≤0.95 ps (12 kHz–20 MHz) at 100 MHz output under typical conditions, well within the PCIe Gen4 specification limit of ≤1.5 ps. This performance is verified across voltage (3.3 V ±5%), temperature (–40°C to +85°C), and process corners per Infineon's production test flow.

Does CY2XF33FLXCT require external loop filter components?

No - the PLL uses an integrated charge pump and loop filter with programmable bandwidth (100 kHz to 1 MHz). All filtering capacitance is embedded in the die; no external RC network is needed. This reduces PCB area, eliminates tuning effort, and improves jitter consistency across units and temperatures.