Infineon Technologies CY2XF24FLXCT

Overview

CY2XF24FLXCT from Cypress Semiconductor is a high-performance, field-programmable LVPECL crystal oscillator with integrated PLL, delivering differential clock outputs from 50 MHz to 690 MHz. It features I²C-controlled frequency margining across four independently programmable frequency words, <1 ps typical RMS phase jitter, and dual supply support (2.5 V or 3.3 V) in a 5.0 × 3.2 mm LCC package. Used for high-speed serial link margin testing in telecom PHY validation and FPGA-based test equipment.

For engineers reviewing the CY2XF24FLXCT datasheet, CY2XF24FLXCT pinout, CY2XF24FLXCT application, or CY2XF24FLXCT equivalent, key selection criteria include I²C-configurable multi-frequency switching, LVPECL output drive capability, RMS phase jitter ≤0.85 ps at 100 MHz, factory- or field-programmable configuration, and industrial temperature operation up to +85°C.

Technical Context

The CY2XF24FLXCT implements a proprietary low-noise PLL architecture locked to an internal AT-cut crystal, enabling precise synthesis of frequencies within 50–690 MHz while avoiding forbidden bands (521–529 MHz, 596–617 MHz). Its I²C interface operates at ≤100 kbit/s with fixed 7-bit slave address 0x69 and supports volatile writes to six-byte frequency words and a two-bit select register.

Each of the four frequency words defines a full PLL configuration-including feedback divider, output divider, and phase offset-with 1 ppm resolution. Frequency transitions are non-glitch-free and require PLL relock time; the device does not retain configuration across power cycles, reverting to factory-set default on power-up.

Key Specifications

Pinout & Package

Package: 6-pin leadless ceramic chip carrier (LCC), 5.0 mm × 3.2 mm, RoHS-compliant, no lead finish.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-frequency programmable oscillator applications.

Compared with Si5338A-B-GM and ICS8430I-01T, the CY2XF24FLXCT uniquely balances single-output simplicity, sub-1 ps jitter, and full I²C-based frequency margining in a 6-pin LCC-making it optimal for compact, test-focused timing applications where reprogrammability and footprint matter most.

Availability

CY2XF24FLXCT is available at Aetrix Electronics and suitable for telecom PHY validation, FPGA transceiver reference clocking, and industrial data acquisition systems requiring stable component supply, long-term lifecycle support, and field-programmable timing flexibility.

Supply support for CY2XF24FLXCT 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

Cypress Semiconductor (now part of Infineon Technologies) designs high-performance timing, memory, and programmable logic solutions for industrial, automotive, and communications markets.

The CY2XF24 product line delivers programmable crystal oscillators optimized for frequency margining in high-speed digital test and validation environments-emphasizing low jitter, I²C configurability, and industrial temperature resilience.

FAQ

Does CY2XF24FLXCT retain its programmed frequency words after power cycling?

No. All frequency word and select register settings are volatile and reset to factory defaults on power-up. The device requires I²C reinitialization at boot to restore user-defined frequencies. This behavior is inherent to its architecture and documented in the "Functional Description" section of Rev. *F datasheet (page 4).

What termination is required for the LVPECL outputs?

The CLK and CLK# outputs require AC-coupled 100 Ω differential termination to VDD − 2.0 V. This is achieved using two 50 Ω resistors: one from CLK to VDD − 2.0 V, and one from CLK# to VDD − 2.0 V. Proper termination ensures correct LVPECL logic levels and minimizes reflections that degrade jitter performance.

Can CY2XF24FLXCT generate frequencies in the 525 MHz range?

No. The CY2XF24FLXCT cannot synthesize frequencies between 521 MHz and 529 MHz, nor between 596 MHz and 617 MHz, due to PLL integer-divider constraints and internal VCO limitations. These gaps are explicitly listed in the "Output Frequencies" section (page 5) of the datasheet.

Is CyClockWizard software required to program CY2XF24FLXCT?

Yes. Cypress mandates CyClockWizard to compute the 6-byte frequency word values for each desired output frequency. The algorithm involves complex PLL divider calculations and cannot be manually derived. The software generates JEDEC files used by the CY3675-CLKMAKER1 programmer kit for field programming.