The **PL580-68QCL-R** is a high-performance, low-phase-noise clock generator/buffer Integrated Circuit (IC) manufactured by **Microchip Technology** (originally part of the PhaseLink/Micrel product lines). It is specifically designed for high-speed networking and telecommunications applications. --- ### 1. Key Technical Specifications | Feature | Specification | | :--- | :--- | | **Logic Output Type** | PECL (Positive Emitter-Coupled Logic) | | **Input Frequency Range** | 19 MHz to 40 MHz (Crystal/Reference) | | **Output Frequency Range** | Up to 800 MHz | | **Supply Voltage (Vcc)** | 2.5V or 3.3V | | **Operating Temperature** | -40°C to +85°C (Industrial Grade) | | **Package Type** | 16-Pin QFN (3x3 mm) | | **Mounting Type** | Surface Mount (SMD/SMT) | --- ### 2. Core Functional Components The IC operates using several specialized internal blocks to ensure high signal integrity: 1. **Phase-Locked Loop (PLL):** Uses a high-frequency VCXO (Voltage Controlled Crystal Oscillator) architecture to multiply the input frequency while maintaining low jitter. 2. **Frequency Multiplier:** It can multiply the input crystal frequency by factors (typically 16x to 24x) to reach high-speed output levels. 3. **PECL Output Driver:** Provides a differential PECL output, which is standard for high-speed data transmission due to its excellent noise immunity and fast switching speeds. 4. **Low Phase Noise Circuitry:** Engineered to minimize "timing jitter," which is critical for maintaining low bit-error rates in data communication. --- ### 3. Applications The PL580-68QCL-R is commonly found in the following systems: * **SONET/SDH:** High-speed optical networking. * **Gigabit Ethernet:** Timing for network switches and routers. * **Fibre Channel:** Storage area networking (SAN). * **Reference Clocking:** Providing a stable heartbeat for FPGAs and ASICs. --- ### 4. Part Number Breakdown * **PL580:** The base series (Low Phase Noise VCXO/Clock IC). * **-68:** Specific internal configuration/frequency multiplier ratio. * **QC:** Package code (QFN package). * **L:** Lead-free / RoHS compliant. * **-R:** Tape and Reel packaging (for automated assembly). ---