The **M7S18TCJ-R** is a high-performance **Crystal Oscillator** (specifically a SPXO - Simple Packaged Crystal Oscillator) manufactured by **TXC Corporation**. It is designed for high-frequency stability in compact electronic circuits. --- ### 1. Technical Specifications The following table outlines the primary electrical and physical characteristics of the component: | Feature | Specification | | :--- | :--- | | **Component Type** | CMOS Output Crystal Oscillator | | **Nominal Frequency** | Typically 18.432 MHz (varies by series) | | **Supply Voltage (Vcc)** | 1.8V / 2.5V / 3.3V (Multi-voltage support) | | **Frequency Stability** | ±25 ppm to ±50 ppm | | **Operating Temperature** | -40°C to +85°C (Industrial Grade) | | **Package Size** | 7.0 x 5.0 x 1.3 mm | | **Output Load** | 15 pF | | **Current Consumption** | 10mA - 20mA (Active) | --- ### 2. Key Internal Components The M7S series consists of two main functional blocks integrated into a single ceramic package: 1. **Quartz Crystal Blank:** A high-precision synthetic quartz piece cut at a specific angle (AT-cut) to vibrate at the target frequency when an electric field is applied. 2. **Oscillator IC (ASIC):** An Integrated Circuit that provides the necessary drive strength, frequency division, and CMOS output buffering. It also handles the "Tri-state" (Enable/Disable) function. --- ### 3. Pin Configuration The device typically uses a 4-pad surface mount (SMD) layout: | Pin Number | Symbol | Function | | :--- | :--- | :--- | | **1** | OE / NC | Output Enable (High = Active; Low = High Impedance) | | **2** | GND | Ground Connection | | **3** | OUT | CMOS Clock Output | | **4** | VDD | Power Supply Voltage | --- ### 4. Common Applications Due to its stability and standardized 7050 (7.0x5.0mm) footprint, it is commonly used in: * **Networking:** Fiber Channel, Gigabit Ethernet, and Switches. * **Storage:** Serial ATA (SATA) and RAID controllers. * **Computing:** Microprocessors and DSP clocking. * **Industrial:** High-reliability embedded systems. ---