The **M7S15TDJ-R** is a high-performance, programmable crystal oscillator module manufactured by **Mercury Electronic**. It belongs to the M7S series, which is known for its versatility in frequency generation and its small surface-mount device (SMD) footprint. ### 1. General Specifications Below are the primary technical characteristics of the M7S15TDJ-R: | Parameter | Specification | | :--- | :--- | | **Component Type** | CMOS Output Programmable Crystal Oscillator | | **Package Type** | 7.0 x 5.0 mm (6 pads) | | **Frequency Range** | 1.0 MHz to 200.0 MHz | | **Supply Voltage ($V_{DD}$)** | +1.8V, +2.5V, or +3.3V (Universal) | | **Operating Temperature** | -40°C to +85°C (Industrial Grade) | | **Frequency Stability** | ±25 ppm to ±100 ppm (Depending on variant) | | **Output Load** | 15 pF | --- ### 2. Key Internal Components and Design The module is more than just a crystal; it is an integrated circuit (IC) solution that combines several electronic stages: 1. **AT-Cut Quartz Crystal:** Acts as the high-precision reference resonator inside the hermetically sealed ceramic package. 2. **Phase-Locked Loop (PLL) IC:** This internal chip multiplies or divides the base crystal frequency to reach the specific target frequency programmed into the device. 3. **CMOS Output Buffer:** Ensures the signal has clean "High" and "Low" states compatible with standard digital logic circuits (FPGA, MCU, DSP). 4. **Tri-State Function:** The "TDJ" designation often implies a specific pin configuration that includes an Enable/Disable (OE) function. When disabled, the output goes into a high-impedance state to save power. --- ### 3. Part Number Breakdown Understanding the suffix helps identify specific electronic behaviors: * **M7S:** Series identifier (7.0 x 5.0 mm package size). * **15:** Represents the load capacitance (15 pF). * **TDJ:** Coding for the specific frequency stability, operating voltage range, and functional pinout (Tri-state). * **-R:** Indicates compliance with **RoHS** (Restriction of Hazardous Substances) standards (Lead-free). --- ### 4. Application Use Cases Because of its programmable nature and wide frequency range, it is commonly used in: * **Telecommunications:** Base stations and routers. * **Embedded Systems:** Providing clock signals for high-speed microcontrollers. * **Industrial Automation:** Timing for PLC (Programmable Logic Controllers). * **Data Storage:** Fibre Channel and Ethernet timing. ---