Infineon Technologies CY29430FLQXIT

Overview

CY29430FLQXIT from Infineon Technologies (formerly Cypress) is a programmable fractional-N PLL clock synthesizer with integrated VCO, supporting four independently configurable differential output frequencies between 15 MHz and 2.1 GHz. It operates on OT3, HFF, LFF crystal modes or low-frequency reference input, delivers 150 fs typical integrated jitter (12 kHz–20 MHz), and supports LVPECL/LVDS/CML/HCSL/LVCMOS outputs with 1.8 V/2.5 V/3.3 V supply compatibility - deployed in OTN, SONET/SDH, and wireless infrastructure timing systems.

For engineers reviewing the CY29430FLQXIT datasheet, CY29430FLQXIT pinout, CY29430FLQXIT application, or CY29430FLQXIT equivalent, key selection criteria include VCXO tunability (±50 to ±275 ppm TPR), I²C reconfigurability (400 kbps), FS[1:0]-based frequency selection, fractional-N architecture for fine resolution, and guaranteed operation from –40 °C to +105 °C.

Technical Context

The CY29430FLQXIT implements a fully integrated LC-based fractional-N PLL with third-overtone (OT3) crystal support and digital VCXO control path using ADC + digital filtering. Its architecture separates nonvolatile configuration storage (OTP NVM) from volatile runtime registers, enabling field updates without reprogramming eFuses.

It supports simultaneous dual-mode operation: hardware-selectable frequencies via FS[1:0] pins (four profiles), and dynamic reconfiguration via I²C interface with small-change (±500 ppm glitchless) and large-change (PLL recalibration) modes - all while maintaining deterministic lock behavior and stable output drive across LVPECL, LVDS, CML, HCSL, and LVCMOS standards.

Key Specifications

Pinout & Package

16-pin QFN package: 3 mm × 3 mm × 0.6 mm body with exposed thermal pad (E-PAD), RoHS-compliant, moisture sensitivity level 3 (MSL3).

Key Features

Applications

Equivalent & Alternatives

Two verified alternatives exist for CY29430FLQXIT with documented functional trade-offs:

Compared with Si5341-B-GM and ICS8430I-01T, CY29430FLQXIT uniquely balances wide frequency coverage (15 MHz–2.1 GHz), field-programmable VCXO (±275 ppm), and glitchless I²C reconfiguration - making it optimal for adaptive, multi-rate, and holdover-critical timing systems.

Availability

CY29430FLQXIT is available at Aetrix Electronics and suitable for OTN line cards, wireless baseband units, high-speed data converter systems, and Synchronous Ethernet equipment requiring stable component supply across extended temperature and long product lifecycles.

Supply support for CY29430FLQXIT 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 management, sensing, connectivity, and timing solutions for industrial, automotive, and communications markets.

CY29430FLQXIT belongs to Infineon's high-performance clock synthesis portfolio, designed specifically for carrier-grade telecom infrastructure, test & measurement instruments, and high-speed data acquisition systems demanding low jitter, wide frequency agility, and robust VCXO control.

FAQ

What crystal types does CY29430FLQXIT support?

CY29430FLQXIT supports third-overtone (OT3), high-frequency fundamental (HFF), low-frequency fundamental (LFF), and external low-frequency clock inputs. Crystal load capacitance values are programmable per mode, and XOUT floats when XIN is used as a clock input - eliminating need for external buffering in most configurations.

Can CY29430FLQXIT generate more than four output frequencies simultaneously?

No - CY29430FLQXIT provides one differential pair (CLK_P/CLK_N) or one single-ended output (CLK_SE) at any time, with up to four distinct frequencies stored in OTP memory and selected via FS[1:0]. Additional frequencies require I²C reprogramming, which may cause brief output interruption during large changes.

Is the VCXO function compatible with all output standards?

Yes - VCXO modulation applies to all supported output standards (LVPECL, LVDS, CML, HCSL, LVCMOS). The Kv slope and TPR are digitally programmed and remain stable across temperature, supply voltage, and process variation, ensuring consistent tuning behavior regardless of output driver configuration.

Does CY29430FLQXIT require power supply sequencing?

No - CY29430FLQXIT has no strict power sequencing requirement. VDD ramp must be monotonic, but VC, FS0, FS1, and I²C signals may power up before or after VDD. However, a stable reference (crystal or clock) must be present at XIN before VDD reaches its minimum operating voltage to ensure correct on-chip calibration.