The **PLL701-17SC-R** is a high-performance, low-jitter clock multiplier/generator integrated circuit manufactured by Microchip Technology (formerly PhaseLink). It is specifically designed to work with fundamental crystal resonators or reference clocks to produce high-frequency outputs for data communication and high-speed networking. --- ### 1. Key Technical Specifications | Feature | Specification | | :--- | :--- | | **Input Frequency** | 10MHz to 27MHz (Fundamental Crystal or Reference) | | **Output Frequency** | Up to 135MHz (depending on multiplier settings) | | **Supply Voltage (VDD)** | 3.3V ± 10% | | **Package Type** | SOIC-8 (Small Outline Integrated Circuit) | | **Operating Temperature** | 0°C to 70°C (Commercial Grade) | | **Output Drive** | 10mA | | **Jitter (RMS)** | < 10ps | --- ### 2. Functional Description The device utilizes an internal **Phase-Locked Loop (PLL)** architecture to synthesize a higher output frequency from a lower-frequency input. * **Multiplier Logic:** It typically features a fixed or selectable multiplier (e.g., 4x or 6x) that scales the input crystal frequency to the desired system clock speed. * **Low Phase Noise:** It is optimized for applications requiring stable timing, such as Gigabit Ethernet or Fibre Channel. * **Crystal Interface:** It includes internal load capacitors, allowing it to interface directly with a standard crystal without many external components. --- ### 3. Pin Configuration (SOIC-8) | Pin # | Name | Description | | :--- | :--- | :--- | | 1 | XIN/REF | Crystal input or reference clock input. | | 2 | XOUT | Crystal output (leave floating if using REF clock). | | 3 | VDD | Power supply (3.3V). | | 4 | GND | Ground connection. | | 5 | CLKOUT | Buffered clock output. | | 6 | S0/S1 | Selection pins for frequency scaling (varies by model). | | 7/8 | NC/OE | No connection or Output Enable (depending on sub-version). | --- ### 4. Part Number Breakdown: `PLL701-17SC-R` * **PLL701-17:** The specific family and multiplier configuration code. * **S:** Package type (SOIC). * **C:** Temperature range (Commercial: 0°C to +70°C). * **-R:** Shipping method (Tape and Reel). --- ### 5. Application Circuit Example ```mermaid graph LR XTAL[Crystal 25MHz] --> PLL[PLL701-17] PLL --> OUT[Clock Out 125MHz] VDD[3.3V] --> PLL GND[Ground] --> PLL ```