The **PLL620-07OC-R** is a low-phase noise, high-performance Frequency Multiplier IC specifically designed to work with high-frequency fundamental crystals. It is commonly used in networking, telecommunications, and server applications to generate stable clock signals. --- ### 1. Key Technical Specifications The following table summarizes the primary electrical and physical characteristics: | Parameter | Specification | | :--- | :--- | | **Manufacturer** | PhaseLink (Acquired by Microsemi / Microchip) | | **Package Type** | SOIC-8 (Small Outline Integrated Circuit) | | **Input Frequency** | 10MHz to 52MHz (Fundamental Crystal) | | **Output Frequency** | Up to 105MHz | | **Multiplication Factor** | 2x | | **Operating Voltage** | 3.3V ± 10% | | **Output Type** | CMOS / TTL | | **Operating Temperature** | 0°C to 70°C (Commercial Grade) | --- ### 2. Functional Description The device integrates several critical electronic sub-systems into a single 8-pin package: * **Phase-Locked Loop (PLL):** The core engine that locks the phase of the output signal to the input reference. It includes a Phase Frequency Detector (PFD), Charge Pump, and a Loop Filter. * **Voltage Controlled Oscillator (VCO):** Generates the high-frequency clock signal. * **Crystal Oscillator Circuit:** Built-in circuitry to drive a fundamental mode crystal without requiring external active components. * **Output Buffer:** A CMOS-level driver designed to provide low jitter and high drive capability for PCB traces. --- ### 3. Pin Configuration (SOIC-8) | Pin # | Name | Description | | :--- | :--- | :--- | | 1 | XIN | Crystal Input or External Reference Clock | | 2 | XOUT | Crystal Output (Leave floating if using external clock) | | 3 | VDD | Power Supply (3.3V) | | 4 | GND | Ground | | 5 | CLKOUT | Buffered Clock Output | | 6-8 | NC/TEST | Non-connected or Factory Test Pins | --- ### 4. Application Advantages 1. **Low Phase Noise:** Optimized for applications where timing precision is critical (e.g., Gigabit Ethernet or Fiber Channel). 2. **Cost Efficiency:** By using a 2x multiplier, designers can use cheaper, lower-frequency crystals to achieve higher-frequency system clocks. 3. **Space Saving:** The integrated loop filter eliminates the need for external resistors and capacitors usually required for discrete PLL designs. ---