The **MHO+77FCD-R** is a specific part number typically associated with **Mironet** (or MtronPTI) frequency control products. This component is a high-precision **Crystal Oscillator (XO)**. Below is a detailed breakdown of its electronic characteristics and technical specifications. --- ## 1. Component Overview The MHO series represents a line of Metal Hermetic Oscillators. These are designed for high reliability, often used in telecommunications, networking, and industrial computing. | Feature | Specification Details | | :--- | :--- | | **Component Type** | Crystal Oscillator (XO) | | **Package Style** | 14-pin DIP (Dual In-line Package) - Half Size or Full Size | | **Output Type** | CMOS / TTL Compatible | | **Standard Voltage** | Typically 5.0V or 3.3V (depending on sub-suffix) | | **Material** | Hermetically sealed metal case for EMI shielding | --- ## 2. Technical Breakdown of Part Code While specific internal codes can vary by manufacturer, the "MHO+77FCD-R" string generally decodes as follows: ### Package and Series (MHO) The **MHO** prefix indicates a metal-can, through-hole oscillator. These are preferred in environments where electromagnetic interference (EMI) must be kept to a minimum, as the metal casing acts as a Faraday cage. ### Stability and Frequency (77FCD) * **77**: Often refers to the frequency stability (e.g., ±25ppm, ±50ppm, or ±100ppm depending on the specific datasheet revision). * **F**: Usually denotes the temperature range (e.g., Industrial: -40°C to +85°C). * **CD**: Specific frequency calibration or duty cycle requirements (usually 40/60% or 45/55%). ### Compliance (-R) * **-R**: Indicates **RoHS Compliance**. This means the part is lead-free and meets environmental safety standards for electronic components. --- ## 3. Key Electronic Functions 1. **Clock Generation:** Provides the fundamental "heartbeat" or timing signal for microprocessors and digital circuits. 2. **Frequency Stability:** Unlike a simple resonator, this integrated circuit includes the crystal and the oscillation electronics, ensuring the frequency stays consistent despite temperature changes. 3. **Tri-State Functionality:** Many models in this series feature a "Tri-state" or "Enable/Disable" pin (Pin 1), allowing the output to be turned off to save power without powering down the entire system. --- ## 4. Typical Pin Configuration (14-pin DIP style) | Pin Number | Function | Description | | :--- | :--- | :--- | | **1** | NC or Tri-State | No connection or Output Enable/Disable | | **7** | GND | Ground / Case Connection | | **8** | Output | The generated clock signal (Square Wave) | | **14** | Vcc | Positive Power Supply (+5V or +3.3V) | ---