The part number **M5R78RLJ-R** refers to a high-performance **Crystal Oscillator** (specifically a differential output oscillator) manufactured by **MtronPTI**. These components are critical for providing precise timing signals in high-speed networking and telecommunications equipment. --- ### 1. Technical Specifications Below are the primary technical characteristics typically associated with the M5R series: | Feature | Specification | | :--- | :--- | | **Output Type** | LVPECL (Low-Voltage Positive Emitter-Coupled Logic) | | **Supply Voltage** | 3.3V (Typical) | | **Package Size** | 5.0 x 7.0 mm (SMD) | | **Frequency Stability** | ±20ppm to ±100ppm (depending on sub-variant) | | **Operating Temperature** | -40°C to +85°C (Industrial Grade) | | **Phase Jitter** | Sub-picosecond (High precision) | --- ### 2. Breakdown of the Part Number While full datasheets are required for exact verification, the MtronPTI coding system generally breaks down as follows: * **M5R**: Series identifier (5.0x7.0mm, 3.3V LVPECL). * **78**: Frequency Stability/Temperature code (often denotes ±25ppm or ±50ppm over a specific range). * **R**: RoHS Compliance (Lead-free). * **L**: Enable/Disable Function (Tri-state). * **J**: Symmetry/Duty Cycle requirements. * **-R**: Tape and Reel packaging. --- ### 3. Key Electronic Functions 1. **Differential Signaling (LVPECL):** This part uses two complementary signals to transmit the clock pulse. This is highly effective at rejecting common-mode noise and is used in environments where EMI (Electromagnetic Interference) is high. 2. **Low Phase Jitter:** The "R" series is designed for "Radio" or high-speed data applications where timing errors (jitter) must be minimized to prevent data corruption. 3. **Tri-state Functionality:** Allows the output to be placed in a high-impedance state, effectively "turning off" the clock without powering down the entire system, which is useful for testing or power saving. ### 4. Common Applications * **Networking:** 10GbE, 40GbE, and 100GbE Ethernet switches. * **Telecommunications:** SONET/SDH and fiber optic modules. * **Storage:** Fiber Channel and SAN (Storage Area Network) equipment. * **FPGA Clocking:** Providing the master reference clock for high-end Xilinx or Altera FPGAs. --- ### 5. Footprint (Example) The device is a 6-pad SMD package. The pinout is generally standardized: ```text Pin 1: Enable/Disable (Control) Pin 2: No Connect Pin 3: Case Ground (GND) Pin 4: Output (Q) Pin 5: Complementary Output (/Q) Pin 6: Supply Voltage (Vcc) ```