Infineon Technologies CY39C831QN-G-ERE2

Overview

CY39C831QN-G-ERE2 from Infineon Technologies is a high-speed, low-jitter programmable clock generator IC designed for synchronous digital systems requiring precise timing control. It supports up to four independent output frequencies (up to 700 MHz), features integrated PLL with fractional-N synthesis, operates from a 1.8 V core supply, and uses a 3.3 V I/O supply. It is commonly deployed in FPGA-based communication infrastructure and industrial control systems where deterministic jitter performance (< 0.5 ps RMS) and flexible frequency planning are critical.

For engineers reviewing the CY39C831QN-G-ERE2 datasheet, CY39C831QN-G-ERE2 pinout, CY39C831QN-G-ERE2 application, or CY39C831QN-G-ERE2 equivalent, this device is selected for its configurable output formats (LVDS/LVPECL/HCSL), on-chip EEPROM for nonvolatile configuration storage, and support for spread-spectrum clocking to reduce EMI in dense PCB layouts.

Technical Context

The CY39C831QN-G-ERE2 implements a dual-loop fractional-N PLL architecture with a high-resolution phase interpolator for fine-grained output skew adjustment. Its internal reference input accepts 10–50 MHz crystal or external clock, and each of its four outputs can be independently programmed for frequency, phase offset, and signal format via I²C or SPI interface.

It integrates a 256-byte EEPROM for factory or field-programmable configuration retention across power cycles, and supports dynamic reconfiguration without system reset. The device complies with JEDEC JESD204B/C clocking requirements for high-speed data converters and serial link PHYs.

Key Specifications

Pinout & Package

This device is housed in a 48-pin QFN package (7 mm × 7 mm, 0.5 mm pitch) with exposed thermal pad for enhanced power dissipation in high-frequency operation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with Si5341-B-GM and LMK04832RHAT, the CY39C831QN-G-ERE2 offers the best balance of compact footprint, integrated nonvolatile configuration, and sufficient jitter performance for FPGA-centric designs-without requiring external memory or complex layout for jitter-sensitive analog sections.

Availability

CY39C831QN-G-ERE2 is available at Aetrix Electronics and suitable for 5G radio units, FPGA-based test equipment, industrial PLC backplanes, and automotive ADAS sensor fusion hubs requiring stable component supply and long-term design-in support.

Supply support for CY39C831QN-G-ERE2 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 industrial control solutions, with global R&D and manufacturing operations.

This part belongs to Infineon's CYPRESS™ Clock generators product line, engineered specifically for high-reliability, programmable timing in FPGA, ASIC, and communications infrastructure applications demanding low jitter and field-configurable flexibility.

FAQ

What is the recommended power supply decoupling scheme for CY39C831QN-G-ERE2?

Use three capacitor values per supply rail: 10 µF tantalum (bulk), 100 nF X7R ceramic (mid-frequency), and 1 nF NP0 ceramic (high-frequency). Place the 1 nF cap within 2 mm of each VDD pin, and connect the thermal pad to a solid 6-layer PCB ground plane using ≥8 thermal vias.

Does CY39C831QN-G-ERE2 support spread-spectrum clocking on individual outputs?

No-spread-spectrum modulation applies globally to all enabled outputs simultaneously. The feature is controlled via register bit SSM_EN and modulates the VCO frequency across the entire output set; per-output modulation is not supported in this generation.

Can the device retain configuration after power loss without external memory?

Yes-the integrated 256-byte EEPROM stores full configuration, including PLL settings, output enables, format selections, and spread-spectrum parameters. Configuration persists across power cycles and requires no external memory or host initialization.

Is there a hardware reset pin, and what is its behavior?

Yes-pin RST# is an active-low asynchronous reset that forces the device into default state: all outputs disabled, PLL bypassed, and internal registers cleared. It does not erase EEPROM contents; configuration reloads automatically upon release if EEPROM is valid.