The **MHO+21TAAD-R** is a high-performance **Crystal Oscillator (XO)** manufactured by MtronPTI. It is part of the MHO+ series, known for providing a stable clock signal for digital circuits. --- ### 1. Component Overview This component is an active crystal oscillator, meaning it contains both the quartz crystal and the oscillation circuitry (transistors and capacitors) in a single package. It operates at a specific frequency to provide a timing reference. ### 2. Technical Specifications The part number "MHO+21TAAD-R" follows a specific naming convention that defines its electrical characteristics: | Parameter | Specification | Details | | :--- | :--- | :--- | | **Package Type** | 14-pin DIP (Full Size) | Metal thru-hole package for EMI shielding. | | **Output Type** | HCMOS / TTL | Compatible with high-speed CMOS and TTL logic levels. | | **Voltage Supply** | 5.0V DC | Standard operating voltage for the internal circuitry. | | **Frequency Stability** | ±100 ppm (Typical) | The deviation allowed over the temperature range. | | **Operating Temp** | 0°C to +70°C | Standard commercial operating range. | | **Tri-state Function** | Included | Pin 1 allows the output to be disabled (High-impedance). | | **RoHS Status** | Compliant (-R) | Indicates the part is lead-free. | --- ### 3. Pin Configuration For a standard 14-pin DIP package like the MHO+ series, only four pins are typically functional: | Pin Number | Function | Description | | :--- | :--- | :--- | | **1** | NC / Tri-state | No connection or Output Enable/Disable. | | **7** | GND | Ground / Case connection. | | **8** | Output | The generated clock signal (Square wave). | | **14** | Vcc | +5.0V Power Supply. | --- ### 4. Key Applications * **Microprocessors:** Providing the main clock cycles for CPUs. * **Networking:** Timing for Ethernet and switching hardware. * **Industrial Control:** Used in PLCs and automation equipment requiring 5V logic. * **Legacy Systems:** Often used as a drop-in replacement for older DIP-style clock oscillators. --- ### 5. Circuit Design Considerations When integrating the MHO+21TAAD-R into a PCB design, keep the following in mind: ```markdown 1. Bypass Capacitor: Place a 0.01µF to 0.1µF ceramic capacitor as close as possible to Pin 14 (Vcc) and Pin 7 (GND) to filter noise. 2. Trace Length: Keep the output trace (Pin 8) short to minimize EMI and signal degradation. 3. Termination: If the trace is long, a series termination resistor (22Ω-47Ω) may be needed to prevent signal overshoot. ```