The **PLL602-89CSC-R** is a high-performance, low-phase-noise clock generator/frequency multiplier Integrated Circuit (IC). It is specifically designed to work with high-frequency crystals to provide differential outputs such as LVPECL or LVDS. --- ### ## Technical Specifications The following table highlights the primary electrical and physical characteristics of the component: | Feature | Specification | | :--- | :--- | | **Manufacturer** | Microchip Technology (formerly PhaseLink) | | **Output Type** | LVPECL (Low-Voltage Positive Emitter-Coupled Logic) | | **Input Frequency Range** | 17MHz to 44MHz (Crystal or Reference) | | **Output Frequency Range** | Up to 800MHz (Multiplied) | | **Supply Voltage (VDD)** | 2.5V or 3.3V | | **Package Type** | SOP-8 (Small Outline Package, 8-pin) | | **Operating Temperature** | 0°C to 70°C (Commercial Grade) | | **Phase Jitter** | < 1ps RMS (typical) | --- ### ## Internal Architecture & Functionality The IC functions through several internal stages to ensure high signal integrity: 1. **Crystal Oscillator Input:** It features an internal oscillator circuit that accepts a standard fundamental mode crystal. 2. **Phase Locked Loop (PLL):** The core of the device. It takes the reference input and multiplies the frequency to the desired high-speed output using a specialized VCO (Voltage Controlled Oscillator). 3. **Differential Output Stage:** It converts the internal clock signal into an LVPECL differential pair, which is ideal for high-speed data transmission over long PCB traces due to its noise immunity. 4. **Power Management:** Includes specialized circuitry to minimize power supply noise from affecting the clock jitter. --- ### ## Key Applications * **Networking:** Used in Gigabit Ethernet and Fibre Channel switches and routers. * **Telecommunications:** Provides the reference clock for SONET/SDH equipment. * **Storage:** High-speed SAN (Storage Area Network) hardware. * **Computing:** High-end server motherboards requiring stable, low-jitter timing references. --- ### ## Example Circuit Connectivity In a standard application, the following connections are typical: ```markdown Pin 1: XIN <-- Crystal Input Pin 2: XOUT --> Crystal Output Pin 3: VDD <-- 3.3V Power Supply Pin 4: GND <-- Ground Pin 5: OUT+ --> LVPECL Non-Inverting Output Pin 6: OUT- --> LVPECL Inverting Output Pin 7: NC <-- No Connection Pin 8: SEL <-- Frequency Selection Pin ```