The **MCSO2EHW** is a high-performance, high-stability **Clock Oscillator** manufactured by Micro Crystal. It is specifically designed for extreme environments, particularly in medical, aerospace, and down-hole applications. --- ## 1. Core Technical Specifications The MCSO2EHW belongs to the family of surface-mount (SMD) crystal oscillators. Below are the primary electronic characteristics: | Parameter | Specification | | :--- | :--- | | **Frequency Range** | 10 kHz to 225 MHz | | **Supply Voltage ($V_{DD}$)** | 1.8V, 2.5V, 3.3V, or 5.0V | | **Output Type** | CMOS / HC-MOS | | **Operating Temperature** | -55°C to +210°C (Extended Temp Range) | | **Package Size** | 5.0 x 3.2 x 1.2 mm | | **Aging** | Low aging (approx. ±3 ppm in first year) | --- ## 2. Key Electronic Components & Internal Design The device is more than just a quartz crystal; it is an integrated circuit assembly consisting of three main internal parts: ### A. High-Q Quartz Crystal Resonator * **Material:** High-purity synthetic quartz. * **Cutting:** Specially oriented to handle extreme temperatures (up to 210°C) without frequency "flipping" or excessive drift. ### B. CMOS Integrated Circuit (ASIC) * **Oscillator Circuit:** Maintains the vibration of the crystal. * **Output Buffer:** Ensures the signal is strong enough to drive downstream components (like Microcontrollers or FPGAs) without distorting the waveform. * **Tri-state Function:** Includes an Enable/Disable pin (Pin 1) to reduce power consumption when the clock is not needed. ### C. Hermetic Ceramic Package * The components are housed in a **Kovar** lid, gold-plated ceramic package. * It is vacuum-sealed or nitrogen-filled to prevent oxidation of the internal metallic electrodes. --- ## 3. Pin Configuration The MCSO2EHW typically utilizes a 4-pad standard layout: | Pin | Name | Function | | :--- | :--- | :--- | | **1** | E/H (Enable) | High = Output Active; Low = High Impedance (Standby) | | **2** | GND | Ground Connection | | **3** | Fout | Frequency Output (CMOS Waveform) | | **4** | $V_{DD}$ | Supply Voltage | --- ## 4. Distinguishing Features 1. **High Shock/Vibration Resistance:** Designed to withstand the physical stress of drilling or aerospace launches. 2. **Wide Voltage Compatibility:** The electronic design allows it to be integrated into low-power 1.8V systems or legacy 5V systems. 3. **Low Jitter:** Provides a very clean timing signal, which is critical for high-speed data transmission. ---