The **CSTCC3M68G56-R0** is a surface-mount (SMD) ceramic resonator manufactured by **Murata Electronics**. It is primarily used as a frequency-determining component in microcontrollers and timing circuits. --- ### 1. Key Technical Specifications | Parameter | Specification | |:---|:---| | **Oscillation Frequency** | 3.68 MHz | | **Frequency Tolerance** | ±0.5% | | **Resonant Impedance** | 50 Ω (Max) | | **Built-in Capacitance** | 47 pF | | **Temperature Stability** | ±0.3% (-20°C to +80°C) | | **Mounting Type** | Surface Mount (SMD) | | **Package Size** | 7.2 x 3.0 mm (approx.) | --- ### 2. Functional Characteristics #### A. CERALOCK® Technology This part belongs to Murata's **CERALOCK®** line. Unlike traditional quartz crystals that require external load capacitors, this series features **built-in load capacitors**. This reduces the component count on the PCB and saves space. #### B. Frequency and Precision At **3.68 MHz**, this resonator is often used for: * Standard clock generation for 8-bit or 16-bit microcontrollers. * Generating specific baud rates for UART/RS-232 serial communication (3.6864 MHz is a standard multiple for communication). #### C. Durability Ceramic resonators are generally more mechanically robust and resistant to shock/vibration compared to fragile quartz crystals, though they offer slightly lower frequency accuracy. --- ### 3. Pin Configuration and Circuitry The device typically features three terminals: 1. **Input:** Connected to the XTAL1/OSC1 pin of the MCU. 2. **Ground:** Connected to the system ground (GND). This is essential for the built-in capacitors. 3. **Output:** Connected to the XTAL2/OSC2 pin of the MCU. ```mermaid graph LR MCU_OSC1 --- Res_Input GND --- Res_CenterPin MCU_OSC2 --- Res_Output ``` --- ### 4. Typical Applications * **Automotive Electronics:** ABS systems, dashboard displays. * **Consumer Electronics:** Remote controls, white goods (washers/dryers). * **Industrial:** Basic timing for low-speed communication interfaces.