The **CSTCE8M50G55-R0** is a ceramic resonator manufactured by **Murata Electronics**. It belongs to the CERALOCK® family and is commonly used as a timing device or clock source for microcontrollers. --- ## 1. Key Specifications The technical parameters of this component are critical for ensuring stable oscillation in embedded circuits. | Parameter | Specification | | :--- | :--- | | **Nominal Frequency** | 8.500 MHz | | **Frequency Tolerance** | ±0.5% | | **Frequency Stability** | ±0.3% (over temperature range) | | **Operating Temperature** | -20°C to +80°C | | **Built-in Load Capacitance** | 33 pF (Internal) | | **Package Type** | SMD (Surface Mount Device) | | **Dimensions** | 3.2 x 1.3 mm | --- ## 2. Component Design & Features The CSTCE series is distinguished by its "chip" design and integrated features that simplify PCB layout. ### Integrated Load Capacitors Unlike traditional quartz crystals that require two external ceramic capacitors to function, the CSTCE8M50G55-R0 has **built-in load capacitors**. * **Benefit:** Reduces the total component count. * **Benefit:** Saves significant PCB real estate. * **Benefit:** Lowers the risk of parasitic interference during oscillation. ### Ceramic vs. Quartz * **Start-up Time:** Ceramic resonators have a much faster start-up time compared to quartz crystals. * **Size:** They are generally smaller and thinner. * **Cost:** Significantly more cost-effective for high-volume consumer electronics. * **Accuracy:** They are less accurate than quartz (±0.5% vs ±0.001%), but sufficient for most USB-less microcontroller applications. --- ## 3. Pin Configuration and Circuitry The device typically has 3 terminals. | Pin Number | Function | Description | | :--- | :--- | :--- | | 1 | Input | Connected to MCU OSC_IN | | 2 | Ground | Connected to System Ground (VSS) | | 3 | Output | Connected to MCU OSC_OUT | ### Typical Application Circuit ```text Microcontroller +---------------+ | | | OSC_IN | <-------+--- [Pin 1: CSTCE] | | | | OSC_OUT | <-------+--- [Pin 3: CSTCE] | | | +---------------+ | | [Pin 2: GND] ``` --- ## 4. Common Applications Due to its 8.5 MHz frequency and small footprint, it is frequently found in: 1. **Consumer Electronics:** Remote controls, toys, and small appliances. 2. **Peripherals:** Computer mice, keyboards, and basic USB controllers. 3. **Microcontrollers:** Serving as the main clock for 8-bit or 16-bit MCUs (like AVR, PIC, or STM8 series).