The **PLL502-02SC-R** is a high-performance Phase-Locked Loop (PLL) based clock multiplier IC, originally designed by PhaseLink (now part of Microchip Technology). It is specifically engineered to generate high-frequency clock signals from lower-frequency crystal or reference inputs with extremely low jitter. --- ### 1. Key Technical Specifications | Feature | Specification | | :--- | :--- | | **Input Frequency Range** | 20MHz to 50MHz (Crystal or Reference) | | **Output Frequency Range** | 20MHz to 190MHz | | **Multiplication Factor** | 4x (Fixed) | | **Supply Voltage (VDD)** | 3.3V (± 10%) | | **Package Type** | SOP-8 (Small Outline Package, 8 pins) | | **Operating Temperature** | 0°C to +70°C (Commercial Grade) | | **Jitter Performance** | < 10ps (Cycle-to-Cycle) | --- ### 2. Core Functional Blocks The device operates using three primary internal stages: 1. **Reference Input:** Accepts a fundamental mode crystal or an external reference clock. 2. **Phase-Locked Loop (PLL):** Synchronizes the output frequency to the input. The internal VCO (Voltage Controlled Oscillator) is tuned to provide a stable 4x multiplier. 3. **Output Buffer:** A CMOS output stage designed to drive capacitive loads (typically up to 15pF) while maintaining signal integrity. --- ### 3. Pin Configuration (SOP-8) | Pin Number | Name | Type | Description | | :--- | :--- | :--- | :--- | | 1 | XIN / CLK | I | Crystal input or external reference clock. | | 2 | XOUT | O | Crystal oscillator output (leave floating if using Ext. CLK). | | 3 | VDD | P | Power supply (3.3V). | | 4 | GND | P | Ground connection. | | 5 | CLKOUT | O | 4x Multiplied clock output. | | 6, 7, 8 | NC / OE | - | No connection or Output Enable (model dependent). | --- ### 4. Application Use Cases * **Networking:** Generating high-speed clocks for Ethernet and Fibre Channel interfaces. * **Computing:** Providing base clocks for high-speed processors or memory controllers. * **Embedded Systems:** Reducing the cost of BOM by using a cheap 25MHz crystal to generate a 100MHz system clock. --- ### 5. Ordering Information Suffixes * **-SC:** Denotes the SOP-8 package and Commercial temperature range. * **-R:** Indicates **Tape and Reel** packaging (suitable for automated SMT assembly).