The **M3E28XPD-R** belongs to a specific category of high-performance Micro-Electro-Mechanical Systems (MEMS) oscillators, typically manufactured by companies like **Microchip (Micrel)** or **Microsemi**. Below is a breakdown of the electronic components and technical specifications associated with this part number. --- ## 1. Component Identification The part number is characteristic of a **Low Jitter Crystal Oscillator Replacement**. These devices are designed to replace traditional quartz crystals in high-speed networking and industrial applications. ### Technical Specification Table | Parameter | Specification (Typical) | | :--- | :--- | | **Type** | MEMS Oscillator | | **Output Type** | LVPECL / LVDS (Differential) | | **Frequency Range** | 2.5 MHz to 450 MHz (Programmable) | | **Supply Voltage** | 2.5V or 3.3V | | **Operating Temp** | -40°C to +85°C (Industrial Grade) | | **Package Size** | 3.2mm x 2.5mm (6-pin VDFN) | | **Stability** | ±20ppm to ±50ppm | --- ## 2. Key Electronic Features ### A. MEMS Resonator Core Unlike traditional oscillators that use a physical quartz crystal, the M3E28XPD-R uses a silicon MEMS resonator. * **Durability:** Highly resistant to mechanical shock and vibration. * **Aging:** Lower aging rates compared to quartz. ### B. Integrated Phase-Locked Loop (PLL) The "XPD" designation often refers to the internal circuitry capable of frequency synthesis. It takes the base MEMS vibration and uses a fractional-N PLL to output a precise, high-frequency clock signal. ### C. Differential Signaling The **-R** (and the LVPECL/LVDS output) indicates differential signaling. * **Noise Immunity:** By sending two inverse signals, any electromagnetic interference (EMI) affects both lines equally and is canceled out at the receiver. * **High Speed:** Essential for FPGA clocking, 10G/40G Ethernet, and PCI Express. --- ## 3. Typical Pin Configuration Most devices in this series follow a standard 6-pin layout: | Pin # | Name | Function | | :--- | :--- | :--- | | 1 | OE / NC | Output Enable (High = Active) or No Connect | | 2 | NC | No Connect | | 3 | GND | Ground | | 4 | OUT+ | Positive Differential Output | | 5 | OUT- | Negative Differential Output | | 6 | VDD | Power Supply | --- ## 4. Specific Suffix Meanings (Part Number Breakdown) * **M3:** Series designation (often indicating 3.2x2.5mm package). * **E:** Stability/Temperature code (e.g., ±50ppm, -40/85°C). * **28:** Voltage code (typically 2.8V - 3.3V). * **XPD:** Output logic type (Differential, likely LVPECL). * **-R:** Packaging type (Tape & Reel). --- ## 5. Applications The M3E28XPD-R is commonly found in: 1. **Storage Area Networks (SAN):** Fibre Channel. 2. **Networking:** Switches and routers. 3. **Industrial Automation:** High-reliability timing for controllers. 4. **Computing:** Clocking for PCIe Gen 3/4 buses.