The **PLL502-39OCL-R** is a high-performance, low-phase-noise Phase-Locked Loop (PLL) clock multiplier IC manufactured by Microchip Technology (formerly PhaseLink). It is specifically designed to work with high-frequency crystals or reference clocks to provide differential outputs. --- ### ## Technical Specifications The following table summarizes the key electrical and physical characteristics of the component: | Feature | Specification | | :--- | :--- | | **Output Type** | LVPECL (Low-Voltage Positive Emitter-Coupled Logic) | | **Input Frequency Range** | 20 MHz to 45 MHz (Crystal or Reference) | | **Output Frequency Range** | 622.08 MHz to 800 MHz | | **Supply Voltage (VDD)** | 3.3V (±10%) | | **Multiplication Factor** | x16, x20 (Depending on configuration) | | **Package Type** | TSSOP-16 | | **Operating Temperature** | 0°C to +70°C (Commercial Grade) | | **Jitter Performance** | < 1ps RMS (typical) | --- ### ## Internal Architecture & Key Blocks The device integrates several critical electronic functions into a single 16-pin package: 1. **Crystal Oscillator Interface:** Contains an internal inverter/amplifier to drive an external fundamental mode crystal. 2. **Phase Frequency Detector (PFD):** Compares the reference input frequency against the divided output frequency to lock the phase. 3. **Voltage Controlled Oscillator (VCO):** A high-frequency internal oscillator that generates the output signal based on the error voltage from the PFD. 4. **LVPECL Drivers:** Provides differential output signals. These require external termination (typically 50Ω to $V_{CC} - 2V$) to function correctly. --- ### ## Pin Configuration Highlights The **PLL502-39** series uses specific pins to control frequency selection and output state: * **XIN / XOUT:** Connections for the fundamental parallel resonant crystal. * **OE (Output Enable):** A CMOS input used to enable or tri-state the LVPECL outputs. * **S0 / S1 (Selection Pins):** Internal pull-up resistors allow the user to select the multiplication ratio or frequency scaling. * **VDD / VSS:** Power supply and ground pins. Decoupling capacitors (0.1µF) are mandatory close to these pins to minimize noise. --- ### ## Application Areas Due to its low jitter and high frequency capabilities, this part is commonly found in: * **Fiber Channel & Gigabit Ethernet:** Clocking for high-speed data transceivers. * **SONET/SDH:** Telecommunication timing circuits. * **Storage Area Networks (SAN):** High-speed disk array controllers.