The **PLL620-05OCL-R** is a high-performance Phase Locked Loop (PLL) clock multiplier IC, typically used in communication and networking equipment to generate high-frequency, low-jitter clock signals from lower-frequency crystals or reference inputs. --- ### 1. Key Technical Specifications | Parameter | Specification | | :--- | :--- | | **Manufacturer** | Microchip Technology (formerly PhaseLink/Micrel) | | **Type** | Low Phase Noise Clock Multiplier | | **Input Frequency Range** | 10MHz to 30MHz (typically via Crystal or Reference) | | **Output Frequency Range** | Up to 700MHz (depending on multiplier settings) | | **Output Logic** | LVPECL (Low-Voltage Positive Emitter-Coupled Logic) | | **Supply Voltage** | 3.3V (±10%) | | **Package Type** | SOIC-8 (8-pin Small Outline Integrated Circuit) | | **Operating Temperature** | 0°C to +70°C (Commercial Grade) | --- ### 2. Functional Electronic Components (Internal) The IC consists of several internal functional blocks that work together to synthesize the clock: 1. **Phase Frequency Detector (PFD):** Compares the phase of the input reference clock with the feedback clock from the VCO. 2. **Charge Pump & Low Pass Filter (LPF):** Converts the error signal from the PFD into a control voltage. 3. **Voltage Controlled Oscillator (VCO):** Generates an output frequency proportional to the control voltage. 4. **LVPECL Drivers:** Provides high-speed differential outputs with low skew and fast rise/fall times, ideal for high-speed data transmission. --- ### 3. Pin Configuration & Application | Pin # | Symbol | Description | | :--- | :--- | :--- | | 1 | XIN / CLK | Crystal or Reference Clock Input | | 2 | XOUT | Crystal Feedback (leave open if using Ref Clock) | | 3 | VDD | Power Supply (3.3V) | | 4 | FIN | Frequency Input / Programming Pin | | 5 | NC | No Connect | | 6, 7 | Q, /Q | Differential LVPECL Outputs | | 8 | VSS | Ground | --- ### 4. Typical Use Case Circuit To implement this part, a basic circuit requires a crystal and specific termination for the LVPECL outputs: ```cpp // Schematic Concept: [Crystal 25MHz] --> [PLL620-05 Pin 1 & 2] [Power 3.3V] --> [PLL620-05 Pin 3] [Ground] --> [PLL620-05 Pin 8] [Outputs Pin 6/7] --> [50 Ohm Termination to VDD-2V] --> [FPGA/ASIC Clock Input] ``` ---