The **PLL602-35OCL-R** is a high-performance, low-power Clock Generator IC specifically designed for high-speed communication and networking applications. It is manufactured by Microchip Technology (originally PhaseLink). --- ## 1. Core Technical Specifications The device is primarily used to generate a low-jitter differential signal (LVPECL) from a standard crystal input. | Feature | Specification | | :--- | :--- | | **Output Type** | LVPECL (Low-Voltage Positive Emitter-Coupled Logic) | | **Input Frequency** | 17MHz to 33.33MHz (Crystal or Reference) | | **Multiplication Factor** | 4x (e.g., 25MHz input yields 100MHz output) | | **Operating Voltage** | 2.5V or 3.3V | | **Package** | SOT-23 (6-pin) | | **Temperature Range** | 0°C to +70°C (Commercial) | | **Jitter** | < 10ps RMS Period Jitter | --- ## 2. Key Internal Components The "PLL" in the part number stands for **Phase-Locked Loop**, which is the heart of this electronic component. ### A. The Phase-Locked Loop (PLL) The internal PLL acts as a frequency multiplier. It synchronizes an internal oscillator with the input frequency to ensure the output is stable and precisely four times the input frequency. ### B. Differential LVPECL Driver Unlike standard CMOS outputs that swing from 0V to VCC, this part uses LVPECL. - **Benefits:** High speed, low noise, and excellent common-mode rejection. - **Requirement:** It requires two output pins (Complementary outputs) to transmit the signal. ### C. Crystal Oscillator Circuit The IC includes internal capacitors and an amplifier to drive a standard AT-cut crystal without needing many external load components. --- ## 3. Pinout Configuration (SOT-23-6) | Pin # | Name | Description | | :--- | :--- | :--- | | 1 | XIN / CLK | Crystal or Reference Clock Input | | 2 | VSS | Ground | | 3 | XOUT | Crystal Output (Leave floating if using external clock) | | 4 | PECL_OUT+ | Non-Inverting LVPECL Output | | 5 | PECL_OUT- | Inverting LVPECL Output | | 6 | VDD | Power Supply (2.5V or 3.3V) | --- ## 4. Part Number Breakdown Understanding the suffix helps in sourcing the exact part: * **PLL602-35:** Base part number (17-33MHz input range). * **O:** Output type (LVPECL). * **C:** Commercial Temperature (0°C to 70°C). * **L:** Lead-Free / RoHS Compliant. * **-R:** Tape and Reel packaging. ---