The **MHO+77FFG-R** is a specific part number typically associated with **MHO+ series crystal oscillators** manufactured by **MtronPTI**. These components are high-precision timing devices used to generate stable clock signals for digital circuits. --- ### 1. Component Specification Overview The part number follows a specific nomenclature that defines its electrical characteristics: | Feature | Specification | Description | | :--- | :--- | :--- | | **Type** | Crystal Oscillator (XO) | A complete timing solution with crystal and internal circuitry. | | **Series** | MHO+ | High-reliability, 14-pin or 8-pin DIP compatible series. | | **Output Type** | HCMOS/TTL | Compatible with most standard logic levels. | | **Voltage** | 5.0V (Standard) | Standard operating supply voltage. | | **Package** | Half-size DIP | Often referred to as an 8-pin DIP (4-pin active). | | **RoHS** | Compliant (-R) | Indicates the part is lead-free and meets environmental standards. | --- ### 2. Pin Configuration (Internal Mapping) Although it fits into an 8-pin DIP footprint, only four pins are typically functional: | Pin Number | Function | Description | | :--- | :--- | :--- | | **Pin 1** | N/C or Tri-state | No connection or Output Enable/Disable function. | | **Pin 4** | Case Ground | Connected to the metal housing for EMI shielding. | | **Pin 5** | Output | The generated square wave frequency signal. | | **Pin 8** | +Vcc | Positive power supply input. | --- ### 3. Key Electronic Characteristics * **Frequency Stability:** Usually ranges from ±25ppm to ±100ppm depending on the specific sub-variant. * **Operating Temperature:** Typically rated for industrial ranges (-40°C to +85°C) or commercial ranges (0°C to 70°C). * **Drive Capability:** Capable of driving 15pF to 50pF loads (standard CMOS loads). * **Jitter:** Designed for low phase jitter to ensure data integrity in high-speed communication. --- ### 4. Typical Applications 1. **Microprocessors:** Providing the base clock frequency for CPUs and MCUs. 2. **Networking:** Timing for Ethernet controllers and routers. 3. **Industrial Control:** Synchronizing logic in PLC (Programmable Logic Controllers). 4. **Legacy Systems:** Often used as a drop-in replacement for older metal-can oscillators in vintage computing or industrial hardware. --- ### 5. Schematic Symbol Example ```text +-------+ (8) -| Vcc |- (5) Output | | (1) -| Tri |- (4) GND +-------+ ```