The **MHO+77FDD-R** is a specific part number typically associated with **MHO (Crystal Oscillators)** manufactured by companies like **Mercury Electronic**. These components are precision timing devices used in various digital circuits. --- ### 1. Technical Specification Table Below is a breakdown of the typical characteristics for this series of crystal oscillators: | Parameter | Specification | | :--- | :--- | | **Component Type** | Crystal Oscillator (XO) | | **Package Style** | DIP-14 (Full size) or DIP-8 (Half size) | | **Output Type** | CMOS / TTL Compatible | | **Operating Voltage** | Typically 5.0V (Standard for MHO series) | | **Frequency Stability** | ±25ppm to ±100ppm (depending on suffix) | | **Operating Temp** | -10°C to +70°C (Standard) | | **RoHS Status** | Compliant (Indicated by the **-R** suffix) | --- ### 2. Breakdown of the Part Number The alphanumeric code provides specific details about the component's construction: * **MHO**: Represents the series (Mercury High Output/Metal Hermetic Oscillator). These are usually housed in a metal "can" to provide EMI shielding. * **77**: Often refers to the specific frequency stability or a variation in the internal IC used for the clock generation. * **FDD**: This is a manufacturer-specific code usually denoting the frequency and the output load requirements (e.g., 50pF or 15pF load). * **-R**: Standing for **RoHS Compliant**, meaning the part is lead-free and meets environmental safety standards. --- ### 3. Key Features & Applications #### Features * **Hermetic Sealing:** The metal casing is vacuum-sealed or filled with nitrogen to protect the quartz crystal from moisture and oxidation. * **Low Jitter:** Designed to provide a clean square wave signal for high-speed digital processing. * **Plug-and-Play:** Unlike a simple 2-pin crystal, this is an **Active Oscillator** (4-pins), meaning it has its own internal circuitry and only requires power to generate a clock signal. #### Common Applications 1. **Microprocessors:** Providing the "heartbeat" for CPUs and Microcontrollers. 2. **Networking Gear:** Used in routers and switches for data synchronization. 3. **Industrial Controllers:** Reliable timing for PLCs and automation hardware. 4. **Legacy Systems:** Often found in older computing hardware due to the DIP-14/DIP-8 through-hole form factor. --- ### 4. Pinout Configuration (Standard DIP-14) If the device is in a standard 4-pin (DIP-14 footprint) configuration, the pins are usually assigned as follows: ```text Pin 1: NC (No Connection) or Tri-state Control Pin 7: GND (Ground) Pin 8: Output (Clock Signal) Pin 14: Vcc (+5V DC) ```