Infineon Technologies CY29411FLXIT

Overview

CY29411FLXIT from Infineon Technologies (formerly Cypress) is a high-performance programmable fractional-N PLL-based crystal oscillator with integrated VCO, supporting differential clock outputs from 15 MHz to 2.1 GHz. It features LVPECL/LVDS/HCSL/CML output standards, 150 fs typical integrated jitter (12 kHz–20 MHz), ±50 to ±275 ppm VCXO total pull range, and operates across 1.8 V/2.5 V/3.3 V supplies at –40 °C to +105 °C - deployed in OTN, wireless infrastructure, and high-speed data converters.

For engineers reviewing the CY29411FLXIT datasheet, CY29411FLXIT pinout, CY29411FLXIT application, or CY29411FLXIT equivalent, key selection criteria include I²C-programmable VCXO tuning, low-jitter differential output configuration, supply voltage flexibility, and OTP-based field/factory frequency programming without external components.

Technical Context

The device integrates a fixed-frequency crystal with a fractional-N LC-VCO PLL architecture, enabling precise frequency synthesis without external loop filters. Its digital configuration engine supports runtime reprogramming via I²C (400 kbps, 7-bit address 0x55), volatile NVMCopy register access, and one-time programmable eFuse storage for factory-set profiles.

VCXO functionality is implemented through analog voltage-controlled modulation of the VCO core, delivering linear Kv slope and stable TPR across temperature and supply variations. Output drivers are configurable per standard (LVPECL/LVDS/HCSL/CML), with OE polarity and lock detection fully programmable in nonvolatile memory.

Key Specifications

Pinout & Package

8-pin LCC package (7.0 × 5.0 mm), RoHS-compliant, lead-free, surface-mountable with exposed pad grounding option per datasheet layout guidelines.

Key Features

Applications

Equivalent & Alternatives

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

Compared with Si5341-B-GM and ICS8430I-01T, CY29411FLXIT uniquely balances single-output simplicity, full I²C programmability, and true VCXO functionality in an 8-pin LCC - making it optimal for space-constrained, dynamically tuned timing nodes.

Availability

CY29411FLXIT is available at Aetrix Electronics and suitable for OTN line cards, wireless baseband units, and high-speed data acquisition systems requiring stable component supply, long-lifecycle support, and guaranteed pin-and-parameter compatibility with legacy Cypress designs.

Supply support for CY29411FLXIT 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 global semiconductor leader headquartered in Munich, Germany, specializing in power systems, automotive MCUs, and high-performance timing solutions - formed through the acquisition of Cypress Semiconductor in 2020.

CY29411FLXIT belongs to Infineon's programmable oscillator product line, designed specifically for applications demanding field-configurable, low-jitter clock synthesis with integrated VCXO capability in compact packages.

FAQ

What output standards does CY29411FLXIT support, and how are they selected?

It supports LVPECL, LVDS, HCSL, and CML output standards. Selection is programmed into nonvolatile memory using ClockWizard 2.1 or direct I²C writes to the "Output Standard" field (memory address range 50h–57h). The setting persists across power cycles and determines driver biasing, termination, and common-mode voltage at startup.

Can CY29411FLXIT be reprogrammed in-system after soldering?

Yes - volatile registers (NVMCopy) are fully accessible via I²C for runtime frequency changes, OE polarity toggling, or VCXO parameter updates. One-time programmable eFuse memory can be written once in factory or lab settings using Cypress-provided programming hardware and [email protected] support.

What is the minimum time required between VDD stabilization and first I²C access?

The datasheet specifies a minimum 5 ms delay after VDD reaches its minimum operating voltage (e.g., 1.71 V for 1.8 V mode) before the first I²C command is accepted. This ensures internal power-on reset completion and NVMCopy initialization from eFuse contents.

How does the VCXO function maintain stability over temperature and voltage variation?

VCXO modulation acts directly on the VCO core-not the crystal-using a proprietary analog pathway with digital filtering. Kv slope, TPR, and modulation bandwidth are stored in OTP memory and calibrated during manufacturing, resulting in <±5% deviation across –40 °C to +105 °C and full VDD range.