## PL580-39OCL-R: Product Overview and Technical Specifications The **PL580-39OCL-R** is a high-performance Phase Locked Loop (PLL) based clock generator designed for high-speed networking and storage applications. It belongs to the **PhaseLink™** product line, currently owned and manufactured by **Microchip Technology**. --- ### 1. Key Technical Specifications | Feature | Specification | |:---|:---| | **Function** | VCXO (Voltage Controlled Crystal Oscillator) / Clock Generator | | **Output Type** | LVPECL (Low-Voltage Positive Emitter-Coupled Logic) | | **Operating Voltage** | 3.3V (±10%) | | **Input Frequency** | 19 MHz to 27 MHz (Standard Crystal Input) | | **Output Frequency** | 38 MHz to 640 MHz (Depending on Multiplier) | | **Package Type** | SOT23-6L (Small Outline Transistor) | | **Operating Temp** | 0°C to +70°C (Commercial Grade) | | **Jitter Performance** | Low phase noise / Ultra-low jitter (<1 ps RMS) | --- ### 2. Electronic Architecture and Functionality The PL580-39OCL-R is engineered to provide a stable, high-frequency differential clock signal from a low-cost fundamental crystal. #### A. PLL Design The internal circuitry uses an analog PLL to multiply the input frequency. This allows the chip to generate high frequencies (up to 640 MHz) without requiring expensive high-frequency crystals. #### B. LVPECL Output The "OCL" designation refers to the output logic. **LVPECL** is preferred in high-speed applications because: * It provides high-speed switching transitions. * The differential signaling offers excellent common-mode noise rejection. * It is suitable for driving long PCB traces with minimal signal degradation. #### C. VCXO Capability The device includes a **Voltage Control (VC)** pin. This allows the user to fine-tune or "pull" the output frequency by applying a control voltage (typically 0V to 3.3V). This is essential for synchronization in clock recovery circuits. --- ### 3. Part Number Breakdown (Decoding) Understanding the suffix helps in identifying packaging and variations: | Segment | Meaning | |:---|:---| | **PL580-39** | Base part number (Family and specific frequency/multiplier configuration) | | **O** | Operating Temperature: Commercial (0°C to +70°C) | | **C** | Package Code: SOT23-6L | | **L** | Lead-free / RoHS Compliant | | **-R** | Tape and Reel (Packaging format for automated assembly) | --- ### 4. Typical Applications * **Networking:** Gigabit Ethernet, SONET/SDH, and Fibre Channel. * **Storage:** SAS/SATA and Host Bus Adapters (HBA). * **Communication:** Base stations and high-speed routers.