The **FCR-166-R/Q** refers to a high-performance **Crystal Oscillator (XO)**, typically manufactured by companies like *Fox Electronics* (now part of Abracon). This specific series is known for its stability and is often used in clock generation for digital circuits. ### 1. Technical Specifications The "R/Q" suffix usually denotes specific packaging or output logic variants (such as HCMOS/TTL compatibility). | Feature | Typical Specification | | :--- | :--- | | **Component Type** | Fixed Frequency Crystal Oscillator | | **Output Type** | HCMOS / TTL | | **Frequency Range** | Usually 1.000 MHz to 100.000 MHz | | **Supply Voltage (Vdd)** | 3.3V or 5.0V (Model dependent) | | **Operating Temp** | -10°C to +70°C (Standard) or -40°C to +85°C | | **Frequency Stability** | ±25ppm to ±100ppm | | **Package Style** | Through-hole (DIP-14 or DIP-8 footprint) | --- ### 2. Pinout Configuration For the FCR series in a standard 4-pin configuration (DIP-14 size), the pinout is generally standardized: | Pin Number | Function | Description | | :--- | :--- | :--- | | **1** | E/D or NC | Enable/Disable (Tri-state) or No Connect | | **7** | GND | Circuit Ground | | **8** | Output | The generated clock signal | | **14** | Vdd | Positive Power Supply | --- ### 3. Key Electronic Characteristics * **Tri-State Functionality:** If the "Q" variant includes an Enable/Disable pin, it allows the output to go into a high-impedance state, reducing power consumption when the clock is not needed. * **Low Jitter:** These oscillators are designed to provide a clean square wave with minimal timing variations, essential for high-speed data processing. * **Load Capacitance:** Optimized to drive loads (typically 15pF to 50pF) without distorting the waveform. --- ### 4. Typical Applications 1. **Microprocessors:** Providing the base clock frequency for CPUs and MCUs. 2. **Networking:** Used in Ethernet cards and routers for synchronized data transmission. 3. **Industrial Control:** Reliable timing for PLCs (Programmable Logic Controllers). 4. **Embedded Systems:** General-purpose timing for digital logic gates. ---