## Technical Overview: PLL602-35QCL-R The **PLL602-35QCL-R** is a high-performance, low-phase-noise clock generator Integrated Circuit (IC) produced by **Microchip Technology** (originally developed by PhaseLink). It is specifically designed to work with high-frequency crystals to produce differential PECL (Positive Emitter-Coupled Logic) outputs. --- ### 1. Key Technical Specifications | Feature | Specification | | :--- | :--- | | **Type** | Clock/Frequency Synthesizer | | **Output Logic** | PECL (Differential) | | **Input Frequency** | 12MHz to 25MHz (Crystal or Reference) | | **Output Frequency** | 768MHz to 800MHz (based on internal multipliers) | | **Supply Voltage (VDD)** | 2.375V to 3.63V | | **Package Type** | SOP-8L (Small Outline Package, 8-lead) | | **Operating Temperature** | 0°C to 70°C (Commercial Grade) | | **Phase Jitter** | < 1ps RMS (Integration range 12kHz to 20MHz) | --- ### 2. Functional Components The IC operates using several internal sub-systems to achieve high-frequency stability: * **Crystal Oscillator Circuit:** Designed to interface with fundamental mode parallel resonant crystals. * **Phase Locked Loop (PLL):** Multiplies the input reference frequency to the GHz range with high precision. * **PECL Driver:** Provides the high-speed differential signal necessary for driving long traces or high-speed clock inputs on FPGAs and ASICs. * **Packaging ("-R"):** The "R" suffix typically denotes **Tape & Reel** packaging for automated SMT (Surface Mount Technology) assembly. --- ### 3. Pin Configuration (SOP-8) | Pin Number | Name | Description | | :---: | :--- | :--- | | 1 | XIN | Crystal Input or Reference Clock Input | | 2 | XOUT | Crystal Output (Leave floating if using Ref Clock) | | 3 | VDD | Power Supply | | 4 | OE | Output Enable (High = Enable; Low = High-Z) | | 5 | P_OUT | PECL Positive Output | | 6 | N_OUT | PECL Complementary (Negative) Output | | 7 | VSS | Ground | | 8 | NC / FIN | No Connect or Frequency Selection (version dependent) | --- ### 4. Typical Applications Due to its low jitter and high-frequency output, this part is commonly used in: * **Networking:** 10GbE, Fibre Channel, and SONET/SDH equipment. * **Storage:** SAS/SATA interface clocking. * **High-Speed Computing:** Providing reference clocks for high-end processors and FPGAs. --- ### 5. Part Number Breakdown * **PLL602-35:** Base Part Family (PECL Clock Generator). * **Q:** Package Code (SOP-8). * **C:** Temperature Grade (Commercial: 0°C to +70°C). * **L:** Lead-free / RoHS Compliant. * **R:** Packing Method (Tape and Reel).