## Technical Overview of the LM393DMR2 The **LM393DMR2** is a widely used, low-power, dual-voltage comparator integrated circuit. Manufactured primarily by ON Semiconductor (onsemi), it is part of the broader LM393 family. The "DMR2" suffix specifically refers to its small-form-factor **Micro8 (MSOP-8)** packaging. --- ### 1. Key Technical Specifications Below are the primary electrical characteristics of the LM393DMR2: | Parameter | Specification | | :--- | :--- | | **Number of Comparators** | 2 (Dual) | | **Supply Voltage (Single)** | +2.0V to +36V | | **Supply Voltage (Dual)** | ±1.0V to ±18V | | **Supply Current** | 0.4 mA (Typical) | | **Output Type** | Open Collector | | **Package Type** | Micro8 / MSOP-8 | | **Operating Temperature** | -40°C to +85°C | --- ### 2. Functional Description The LM393DMR2 is designed to compare two input voltages and provide a digital output based on which input is higher. * **Open-Collector Output:** The output stage does not have an internal pull-up resistor. This means you must connect an external resistor (to $V_{cc}$ or another logic level) to achieve a "High" state. This allows for "wired-OR" connections and level shifting. * **Common-Mode Input Range:** The input common-mode voltage range includes ground, even if operated from a single power supply. * **Low Power Consumption:** It is optimized for battery-operated devices due to its minimal current draw. --- ### 3. Pin Configuration (Micro8) The device features 8 pins, divided between the two internal comparators: 1. **OUTPUT A:** Output of the first comparator. 2. **INPUT A (-):** Inverting input of the first comparator. 3. **INPUT A (+):** Non-inverting input of the first comparator. 4. **GND/V-:** Negative supply or ground. 5. **INPUT B (+):** Non-inverting input of the second comparator. 6. **INPUT B (-):** Inverting input of the second comparator. 7. **OUTPUT B:** Output of the second comparator. 8. **Vcc/V+:** Positive supply voltage. --- ### 4. Common Applications Due to its versatility and small size, the LM393DMR2 is found in: * **Limit Comparators:** Checking if a voltage is within a specific window. * **Zero-Crossing Detectors:** Identifying when an AC signal crosses 0V. * **Clock Building Blocks:** Creating square waves from sine waves. * **Battery Monitors:** Triggering an LED or signal when voltage drops below a threshold. --- ### 5. Implementation Example (Basic Comparator) To use the LM393, a pull-up resistor is required. Here is a logic representation: ```cpp // Schematic Logic Logic // Vcc ----[Resistor]----+---- Output // | // [Pin 1/7] ``` ---