The **MHO+74TCG-R** is a specific part number for a high-performance **Crystal Oscillator**. It belongs to the MHO series manufactured by companies like MtronPTI. These components are critical for providing a stable clock signal in digital circuits. --- ### 1. Part Number Breakdown While specific prefixes can vary slightly by manufacturer, the nomenclature generally breaks down as follows: | Segment | Meaning | Specification | | :--- | :--- | :--- | | **MHO** | Series | Metal Hybrid Oscillator (usually HCMOS/TTL compatible) | | **+** | RoHS Compliance | Lead-free / RoHS compliant component | | **74** | Package Type | 14-pin DIP compatible (Full size metal can) | | **TCG** | Stability/Temp | Specific temperature range and frequency stability code | | **-R** | Packaging | Tape & Reel or specific Revision code | --- ### 2. Technical Specifications Typically, an oscillator in this class features the following electrical characteristics: * **Output Type:** HCMOS / TTL compatible (capable of driving multiple logic gates). * **Supply Voltage ($V_{cc}$):** Generally 5.0V or 3.3V (refer to the specific datasheet for the 74TCG variant). * **Frequency Range:** Available in various frequencies (e.g., 1.0 MHz to 150 MHz). * **Frequency Stability:** Often ±25ppm to ±100ppm depending on the "TCG" grade. * **Operating Temperature:** Usually -40°C to +85°C (Industrial Grade). --- ### 3. Pin Configuration (14-Pin DIP Style) Even though it is a "metal can," it typically only uses 4 functional pins: | Pin Number | Function | Description | | :--- | :--- | :--- | | **1** | NC or Tri-state | No connection or Output Enable/Disable | | **7** | GND | Case Ground / Negative Supply | | **8** | Output | The generated Square Wave signal | | **14** | $V_{cc}$ | Positive Supply Voltage | --- ### 4. Typical Applications * **Microprocessors:** Providing the base clock for CPUs and MCUs. * **Networking:** Timing for Ethernet controllers and routers. * **Industrial Control:** Stable timing for PLC (Programmable Logic Controllers). * **Legacy Systems:** Used as a drop-in replacement for older 14-pin DIP clock oscillators. --- ### 5. Circuit Implementation Example To use this part, a bypass capacitor is essential to reduce power supply noise. ```c // Schematic Representation [Power 5V] ----+---- Pin 14 (Vcc) | [0.1uF Capacitor] | [Ground] ----+---- Pin 7 (GND) Pin 8 (Output) ----> [To Clock Input of IC] ```