## PL680-39OC-R: Technical Overview The **PL680-39OC-R** is a high-performance **Clock Generator/Frequency Synthesizer** integrated circuit (IC). It is part of Microchip Technology's (formerly PhaseLink) lineup, designed specifically for low-phase noise clocking applications in networking and telecommunications. ### Key Specifications | Parameter | Specification | | :--- | :--- | | **Manufacturer** | Microchip Technology | | **Core Function** | Clock Synthesizer / Frequency Multiplier | | **Output Type** | LVPECL (Differential) | | **Number of Outputs** | 1 (Differential pair) | | **Input Frequency Range** | 19MHz to 40MHz (Fundamental Crystal) | | **Output Frequency Range** | 38MHz to 800MHz | | **Operating Voltage** | 2.5V or 3.3V | | **Package Type** | TSSOP-16 | | **Jitter Performance** | Ultra-low phase noise (< 0.5ps RMS) | --- ### Functional Components The internal architecture of the PL680-39OC-R consists of several critical electronic stages: 1. **Reference Oscillator:** Accepts a fundamental mode crystal or an external reference clock. 2. **Phase Locked Loop (PLL):** Uses a high-frequency voltage-controlled oscillator (VCO) to multiply the input frequency to the desired output speed. 3. **Frequency Dividers:** Programmable internal dividers (P-dividers) allow the chip to scale the output to specific telecommunications standards. 4. **LVPECL Output Driver:** The "Low-Voltage Positive Emitter-Coupled Logic" driver provides high-speed differential signals, which are essential for reducing electromagnetic interference (EMI) and maintaining signal integrity over distance. --- ### Application Usage This specific part is typically found in high-bandwidth hardware environments: * **Fibre Channel & Ethernet:** Providing the reference clock for 1GbE and 10GbE network interfaces. * **SONET/SDH:** Used in optical transmission equipment requiring precise timing. * **Storage Area Networks (SAN):** High-speed data transfer timing. ### Decoding the Part Number * **PL680:** Series prefix for high-performance PLL clock generators. * **39:** Specific internal configuration/frequency multiplier ratio. * **O:** Operating temperature range (Commercial: 0°C to +70°C). * **C:** Package code (TSSOP). * **R:** Packaging suffix (Tape and Reel).