The **M5R28ZPJ-R** is a high-performance, programmable crystal oscillator developed by **Mercury Electronic**. It belongs to the M5R series, which is known for its versatility in frequency generation and its compact surface-mount design. --- ### ## Technical Specifications Below are the primary electronic characteristics of the M5R28ZPJ-R: | Parameter | Specification | | :--- | :--- | | **Component Type** | Programmable Crystal Oscillator (PECL) | | **Output Type** | Positive Emitter Coupled Logic (PECL) | | **Supply Voltage (Vcc)** | +2.8V to +3.3V DC | | **Package Size** | 5.0 x 7.0 mm (SMD) | | **Frequency Range** | Typically 1.0 MHz to 200 MHz (Programmable) | | **Frequency Stability** | ±25ppm to ±100ppm (depending on grade) | | **Operating Temperature** | -40°C to +85°C (Industrial Grade) | | **Pin Count** | 6 Pins | --- ### ## Pin Configuration The M5R series typically follows a standard 6-pin layout for PECL oscillators: 1. **Pin 1 (OE/VC):** Output Enable or Voltage Control (for VCXO versions). 2. **Pin 2 (NC):** No Connection. 3. **Pin 3 (GND):** Ground. 4. **Pin 4 (Output):** Main PECL Output. 5. **Pin 5 (Comp Output):** Complementary PECL Output. 6. **Pin 6 (Vcc):** Supply Voltage. --- ### ## Key Electronic Features * **PECL Output:** The "P" in the part number indicates **PECL** (Positive Emitter Coupled Logic). This is ideal for high-speed data transmission because it offers low jitter and high-frequency capabilities, though it requires specific termination resistors. * **Programmability:** These units are often programmed by the manufacturer or a distributor to a specific frequency, allowing for fast turnaround times compared to traditional "cut" crystals. * **Phase Jitter:** Designed for low phase noise, making it suitable for timing in telecommunications and high-speed networking hardware. * **Tri-state Function:** Pin 1 usually supports an Output Enable (OE) function, allowing the output to be placed in a high-impedance state for testing or power saving. --- ### ## Common Applications * **Networking:** Gigabit Ethernet, Fiber Channel, and SONET/SDH. * **Computing:** High-speed servers and data storage arrays. * **Telecommunications:** Base stations and optical transmission switching equipment.