## Electronic Analysis: PLL602-39OCL-R The **PLL602-39OCL-R** is a high-performance, low-phase-noise Phase Locked Loop (PLL) clock generator integrated circuit, primarily designed for networking and storage applications (like Fibre Channel and Ethernet). It is manufactured by **Microchip Technology** (formerly PhaseLink/Micrel). --- ### 1. Key Technical Specifications The following table summarizes the primary electrical and functional characteristics of the device: | Parameter | Specification | | :--- | :--- | | **Type** | VCXO (Voltage Controlled Crystal Oscillator) to LVPECL | | **Input Frequency** | 12 MHz to 25 MHz (Crystal or Reference) | | **Output Frequency** | 75 MHz to 200 MHz | | **Output Type** | Differential LVPECL | | **Supply Voltage (VDD)** | 2.5V or 3.3V | | **Package** | TSSOP-16 | | **Operating Temperature** | 0°C to +70°C (Commercial) | | **Jitter Performance** | < 1.0 ps RMS (12 kHz to 20 MHz) | --- ### 2. Functional Core Components The internal architecture consists of several critical electronic blocks: * **VCXO Input:** It accepts a fundamental crystal input. The "Voltage Control" feature allows for fine-tuning of the output frequency by applying an analog voltage to the $V_{IN}$ pin. * **Phase Frequency Detector (PFD):** Compares the reference input frequency against the feedback signal from the internal VCO. * **Internal VCO:** A high-frequency Voltage Controlled Oscillator that generates the actual clock signal based on the PFD error voltage. * **Differential LVPECL Driver:** Converts the internal CMOS-level clock into a Low-Voltage Positive Emitter-Coupled Logic (LVPECL) signal, which is ideal for high-speed data transmission due to its high noise immunity. --- ### 3. Pinout & Connectivity The TSSOP-16 package utilizes specific pins for its differential signaling and frequency control: 1. **XIN / XOUT:** Connects to the external crystal. 2. **VC:** Voltage control input for frequency modulation/tuning. 3. **OE:** Output Enable. High activates the outputs; Low puts them in high-impedance. 4. **PECL0 / PECL0#:** The primary differential output pair. 5. **VDD / VSS:** Power supply and ground pins. --- ### 4. Part Number Breakdown The suffixing provides information on the packaging and revisions: * **PLL602-39:** The base model family (Low phase noise VCXO). * **O:** Output configuration (specifically calibrated for specific multipliers). * **C:** Commercial Temperature range (0°C to 70°C). * **L:** Lead-free / RoHS compliant packaging. * **-R:** Tape and Reel packaging for automated assembly. --- ### 5. Common Applications * **Fibre Channel:** Generating stable 106.25 MHz or 212.5 MHz clocks. * **Gigabit Ethernet:** 125 MHz and 156.25 MHz clocking. * **SONET/SDH:** High-precision timing for optical networks. * **Storage Area Networks (SAN):** Low-jitter clock distribution for data integrity.