The **M7S66FDJ-R** is a high-performance, differential output crystal oscillator developed by **TXC Corporation**. It belongs to the M7 series, which is specifically designed for high-frequency applications requiring low jitter and high stability. --- ### 1. Key Technical Specifications | Feature | Specification | | :--- | :--- | | **Output Type** | LVDS (Low-Voltage Differential Signaling) | | **Supply Voltage** | 2.5V or 3.3V (Typical) | | **Frequency Range** | 10 MHz to 1500 MHz (Commonly used for 100MHz+) | | **Package Size** | 7.0 x 5.0 x 1.6 mm | | **Frequency Stability** | ±25 ppm / ±50 ppm (Depending on variant) | | **Operating Temp** | -40°C to +85°C (Industrial Grade) | | **Phase Jitter** | < 0.3 ps (Typ.) | --- ### 2. Functional Characteristics * **LVDS Differential Output:** This part utilizes LVDS logic, which provides excellent noise immunity and low power consumption at high speeds compared to standard CMOS oscillators. * **Fundamental / 3rd Overtone Crystal:** It uses high-precision quartz blanks to ensure long-term aging stability. * **Tri-state Function:** The "FDJ" suffix usually indicates a specific pin configuration that includes an Enable/Disable (Output Enable) function, allowing the system to save power when the clock signal is not needed. --- ### 3. Pin Configuration (Typical 6-Pad) | Pin # | Symbol | Description | | :--- | :--- | :--- | | 1 | OE | Output Enable (High = Active) | | 2 | NC | No Connection | | 3 | GND | Ground | | 4 | OUT+ | Differential Output (+) | | 5 | OUT- | Differential Output (-) | | 6 | VDD | Supply Voltage | --- ### 4. Common Applications Due to its low jitter and high-frequency capabilities, the M7S66FDJ-R is primarily found in: * **Networking:** 10G/40G/100G Ethernet switches and routers. * **Storage:** Fiber Channel and PCI Express (PCIe) clocking. * **Telecommunications:** Base stations and optical transport equipment. * **Computing:** High-speed servers and FPGA clocking. --- ### 5. Part Number Breakdown (TXC Convention) While full proprietary codes vary, the structure generally follows: * **M7:** Series Identifier (7.0x5.0mm LVDS). * **S:** Supply Voltage (e.g., 3.3V). * **66:** Frequency or Internal code. * **FDJ:** Specific stability and temperature range configuration. * **R:** Tape and Reel packaging.