The **PL580-39OC-R** is a high-performance, low-phase noise clock generator Integrated Circuit (IC) developed by Microchip (formerly PhaseLink/Micrel). It is specifically designed for high-frequency applications requiring high stability and low jitter. --- ### 1. General Specifications The following table summarizes the primary electrical and mechanical characteristics: | Feature | Specification | | :--- | :--- | | **Part Number** | PL580-39OC-R | | **Package Type** | SOP-8 (Standard Outline Package, 8 pins) | | **Output Type** | PECL (Positive Emitter-Coupled Logic) | | **Input Frequency Range** | 17MHz to 36MHz (Crystal or Reference) | | **Output Frequency Range** | Up to 640MHz (Multiplied) | | **Supply Voltage (Vcc)** | 2.5V or 3.3V | | **Operating Temperature** | 0°C to +70°C (Commercial Grade) | | **Packaging Format** | Tape & Reel ("-R" suffix) | --- ### 2. Core Functional Components The PL580-39OC-R is more than just a simple oscillator; it is a complex frequency synthesizer. Its internal architecture includes: 1. **Phase-Locked Loop (PLL):** The heart of the chip. It takes a low-frequency reference (from a crystal) and multiplies it to a high-frequency output while maintaining phase synchronization. 2. **Voltage Controlled Oscillator (VCO):** An internal oscillator that adjusts its frequency based on the PLL control voltage to ensure precise timing. 3. **PECL Output Buffer:** This stage ensures the signal can drive high-speed differential transmission lines with minimal distortion. 4. **Frequency Multiplier:** Allows for output frequencies that are integer multiples of the input crystal, reducing the need for expensive high-frequency crystals. --- ### 3. Key Electronic Advantages * **Low Phase Noise:** Engineered specifically to minimize "timing jitter," which is critical in high-speed data communication to prevent bit errors. * **Differential Signaling:** Since it uses PECL outputs, it provides excellent noise immunity. In differential signaling, external electromagnetic interference (EMI) affects both lines equally and is cancelled out at the receiver. * **Design Integration:** By integrating the PLL and VCO, it saves significant PCB space compared to discrete oscillator circuits. --- ### 4. Common Applications This part is typically found in infrastructure-grade electronics, including: * **Fiber Optic Networking:** SONET, SDH, and Gigabit Ethernet. * **Storage Area Networks (SAN):** Fibre Channel equipment. * **High-End Computing:** Server motherboards and precision timing for FPGAs. --- ### 5. Pin Configuration (Typical SOP-8) Below is a simplified representation of the pinout: ```text +---U---+ XIN | 1 8 | VCC XOUT | 2 7 | OUT (PECL) PSEL | 3 6 | /OUT (PECL) GND | 4 5 | OE (Output Enable) +-------+ ```