Product Overview
The Infineon Technologies CY2077FSXC is a highly programmable, low-cost clock generator designed to replace crystals, crystal oscillators, and standard system clocks in a variety of consumer, computing, and communication applications. This device is part of the Cypress (now Infineon) CY2077 family and is notable for its ability to provide multiple output frequencies from a single, low-cost external crystal reference. With integrated PLLs (Phase-Locked Loops), spread spectrum capabilities, and I²C programmability, the CY2077FSXC offers flexibility for timing-critical applications such as PC motherboards, printers, consumer audio-video systems, and embedded controllers.
Packaged in an 8-pin SOIC (Small Outline Integrated Circuit) format, the CY2077FSXC is optimized for minimal board space, low power consumption, and compatibility with 3.3 V power rails. It supports multiple output frequencies, programmable spread spectrum modulation for EMI reduction, and various output drive capabilities. These features make it suitable for systems where clock flexibility and spectral cleanliness are critical.
Key Features
* Programmable clock generator with up to three output clocks
* Low-cost replacement for crystal oscillators and fixed-frequency clock sources
* Integrated PLL for flexible frequency synthesis
* I²C-compatible interface for in-system programmability
* Spread spectrum clocking for EMI reduction
* External crystal frequency typically 8 MHz to 30 MHz
* Configurable output frequencies up to 200 MHz
* 3.3 V operation with low power consumption
* 8-pin SOIC package
* Industrial temperature range operation
Electrical Specifications
* Operating Voltage (VDD): 3.3 V ±10%
* Input Frequency (Crystal): 8 MHz to 30 MHz
* Output Frequency Range:
* CLK1, CLK2, CLK3: Up to 200 MHz (depending on configuration)
* Output Format: LVCMOS
* Output Drive Strength: 8 mA (typical), configurable
* Duty Cycle: 45% to 55% typical
* Cycle-to-Cycle Jitter: < 250 ps (typical)
* Long-Term Stability: Depends on reference crystal; typically within ±50 ppm
* Power Consumption:
* Active: < 40 mA typical at 3.3 V
* Standby/Power-down: < 10 µA
* ESD Protection: 2 kV HBM
* I²C Interface Voltage Compatibility: 3.3 V
* Programmability: Supports EEPROM-based configuration or one-time programmable (OTP) setups
* Package: 8-SOIC (150 mils)
* Operating Temperature Range: –40 °C to +85 °C (Industrial grade)
Functional Description
The CY2077FSXC is designed to replace fixed-frequency oscillators in systems that require multiple, customizable clock signals. Its core functionality is based on an internal PLL that multiplies the input crystal reference frequency to generate the desired output clocks. This allows developers to choose nearly any output frequency (within device limits) by programming divider and multiplier values via the I²C interface.
The device supports multiple output configurations, making it ideal for applications requiring several asynchronous or phase-aligned clocks. In addition, the inclusion of spread spectrum modulation helps reduce electromagnetic interference (EMI) by dithering the clock signal in a controlled manner. This is especially useful in applications such as PCs or printers, where regulatory EMI limits are strict.
The CY2077FSXC also provides low jitter and a stable clock source, ensuring reliable operation in digital communication or data acquisition systems. By integrating clock generation and EMI mitigation in one IC, the CY2077FSXC reduces BOM cost and simplifies PCB design.
Typical Applications
* Consumer electronics (DVD players, audio systems, set-top boxes)
* PC motherboards and peripherals
* Printers and MFPs (multi-function peripherals)
* Industrial control systems
* Embedded controllers and microcontroller-based designs
* Networking and communication equipment
* Low-EMI digital designs
* FPGA and DSP clocking
Design Considerations
* Crystal Selection: The performance of the CY2077FSXC heavily depends on the quality and accuracy of the external crystal. A ±20 ppm crystal is typically recommended.
* Programming: Device configuration is performed via an I²C-compatible interface. Depending on the variant, OTP or EEPROM programming may be available. Programming tools are needed to define output frequencies, enable spread spectrum, and select output drive levels.
* Spread Spectrum Use: When EMI reduction is a requirement, enabling spread spectrum can lower peak emissions by several dB. This is especially effective in systems passing FCC or CISPR Class B limits.
* Power Supply Decoupling: Proper decoupling (e.g., 0.1 μF and 10 μF capacitors close to VDD) is recommended for stable performance.
* Thermal Considerations: The device is low-power and does not require a heat sink under typical conditions, but airflow and layout considerations still apply.
* Layout Recommendations: Keep crystal traces short and shielded. Avoid routing clock outputs adjacent to noisy or sensitive analog lines. Use controlled impedance if high-frequency clock traces are long.
Summary
The Infineon CY2077FSXC is a versatile, programmable clock generator that offers an effective replacement for fixed-frequency crystal oscillators in a wide range of applications. With I²C programmability, multiple clock outputs, integrated PLL architecture, and spread spectrum modulation, it provides system designers with the flexibility to generate customized timing signals while reducing EMI. Its small footprint, low power operation, and broad configurability make it an excellent solution for embedded, consumer, and industrial systems that demand cost-effective, configurable clocking with minimal external components.
