Infineon Technologies CY29412FLXI

Overview

CY29412FLXI from Infineon (Cypress) is a high-performance programmable PLL-based crystal oscillator delivering differential clock outputs from 15 MHz to 2.1 GHz. It features a fractional-N PLL with integrated VCO, 150 fs typical integrated jitter (12 kHz–20 MHz), and supports LVPECL, LVDS, HCSL, and CML standards. Housed in an 8-pin LCC (7.0×5.0 mm) package, it operates from 1.8 V to 3.3 V supplies and includes VCXO capability with programmable pull range (±50 to ±275 ppm), making it suitable for OTN, SONET/SDH, and wireless infrastructure timing.

For engineers reviewing the CY29412FLXI datasheet, CY29412FLXI pinout, CY29412FLXI application, or CY29412FLXI equivalent, the device's I2C-configurable output standard, VCXO modulation bandwidth, and small/large frequency change commands are key selection criteria for low-jitter clock generation in communications and test systems.

Technical Context

The CY29412FLXI uses a fractional-N PLL with an integrated LC VCO and an on-chip fixed-frequency crystal reference. Its digital configuration block, accessible via I2C (Fast Mode, 400 kbps), allows reconfiguration of output frequency, output standard, VCXO parameters, and OE polarity without hardware changes. The device incorporates an NVM (one-time programmable) and a volatile "NVMCopy" register that loads on power-up, enabling field customization through small-change (±500 ppm glitchless) or large-change (PLL recalibration) commands.

For VCXO operation, an internal ADC and digital filtering convert the VC input voltage to a frequency modulation with linear pull profile, programmable total pull range from ±50 ppm to ±275 ppm, and adjustable Kv slope. The architecture supports simultaneous output divider stages to generate frequencies from 15 MHz up to 2.1 GHz while maintaining 150 fs typical integrated jitter across the range.

Key Specifications

Pinout & Package

The CY29412FLXI is supplied in an 8-pin LCC (Leadless Chip Carrier) package measuring 7.0 × 5.0 mm (CY2941x family). The pin assignment supports differential clock outputs, I2C configuration, supply, and VCXO control.

Key Features

Applications

Availability

CY29412FLXI is available at Aetrix Electronics and suitable for OTN line cards, wireless base station timing, and high-speed data converter applications requiring stable component supply. The device is offered in tape-and-reel packaging and supports lead-free soldering with a moisture sensitivity level (MSL) per JEDEC standards.

Supply support for CY29412FLXI 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 AG, through its Cypress product line, designs and manufactures high-performance timing, connectivity, and memory solutions. The company serves automotive, industrial, and communications markets with over 50,000 employees worldwide.

The CY2941x/CY2942x series belongs to Infineon's programmable oscillator portfolio developed to replace fixed-frequency XO and VCXO modules, offering field-configurable frequency, output standard, and VCXO parameters for communications and test equipment applications.

FAQ

What is the default output enable polarity of CY29412FLXI?

The default OE polarity is active low. When OE is low, the differential outputs (CLKP/CLKN) are driven to differential low (logic 0). The polarity can be changed to active high via the I2C register. If OE is unused, connect it to GND or VDD as per the desired output state.

Can the CY29412FLXI be programmed in-system after it is soldered?

Yes, the volatile memory (NVMCopy) can be written via I2C to change output frequency, VCXO parameters, and output standard on the fly. However, the non-volatile NVM can only be programmed once (OTP) and is intended to store a default configuration. In-system frequency changes are done through small-change or large-change commands without requiring a new device.

What is the difference between Small Change and Large Change?

Small Change adjusts frequency within ±500 ppm and the output updates glitchlessly without interrupting the clock. Large Change is for shifts greater than ±500 ppm; the device recalibrates the PLL and the outputs are held at differential low state during the reconfiguration. After completion, the new frequency is produced normally.

Is the VCXO function available on the CY29412FLXI?

Yes, the CY29412FLXI includes a VCXO input (VC pin) that modulates the output frequency proportional to the applied analog voltage. The total pull range, modulation bandwidth, and Kv (slope) are programmable via I2C registers. The pull profile is linear and stable over temperature and supply, making it suitable for phase-locked loop synchronization.