The **M7S25FDJ-R** is a high-performance, differential output crystal oscillator manufactured by **TXC Corporation**. It belongs to the M7S series, which is designed for high-frequency applications requiring low jitter and high stability. --- ### 1. Key Technical Specifications The following table highlights the primary electronic characteristics of the M7S25FDJ-R: | Parameter | Specification | | :--- | :--- | | **Output Type** | LVDS (Low-Voltage Differential Signaling) | | **Nominal Frequency** | 25.000 MHz | | **Supply Voltage (Vdd)** | 2.5V (Standard for "F" series) | | **Frequency Stability** | ±50 ppm (Standard for "D" grade) | | **Operating Temperature** | -40°C to +85°C (Industrial Grade) | | **Package Size** | 7.0 x 5.0 mm (6-pad SMD) | | **Phase Jitter** | < 1 ps (typical) | --- ### 2. Functional Description The M7S25FDJ-R is more than just a crystal; it is an active **Oscillator (XO)**. It integrates a quartz crystal resonator with a CMOS-based integrated circuit to provide a stable clock source. * **LVDS Output:** It provides a differential output signal. This is crucial for high-speed data transmission because differential signals are highly resistant to electromagnetic interference (EMI) and common-mode noise. * **Low Phase Jitter:** The "J" in the part number often signifies high-precision/low-jitter characteristics, making it suitable for timing-critical network components. * **Tri-State Function:** Pad 1 typically serves as an "Enable/Disable" pin. When set to high or left floating, the device outputs the frequency. When set low, the output goes into a high-impedance state to save power. --- ### 3. Part Number Breakdown The nomenclature for TXC oscillators follows a specific logic: | Code | Meaning | | :--- | :--- | | **M7** | Series Name (7.0 x 5.0 mm SMD LVDS) | | **S** | Output Type (Differential) | | **25** | Frequency (25.000 MHz) | | **F** | Voltage (2.5V) | | **D** | Stability (±50 ppm) | | **J** | Operating Temp Range (-40 ~ +85°C) | | **R** | Packaging (Tape & Reel) | --- ### 4. Typical Applications Due to its 25MHz frequency and LVDS output, this part is commonly found in: 1. **Fiber Channel & Ethernet:** Providing the reference clock for Gigabit Ethernet PHYs. 2. **Storage Area Networks (SAN):** Used in high-speed data storage controllers. 3. **FPGA/ASIC Clocking:** Acting as the master clock for high-performance programmable logic devices.