The **LM393DGKR** is a widely used, low-power, dual-voltage comparator integrated circuit (IC) manufactured by Texas Instruments. It is designed to operate from a single power supply over a wide range of voltages. --- ## 1. Key Specifications The following table summarizes the primary electrical characteristics of the LM393DGKR: | Parameter | Value | | :--- | :--- | | **Number of Channels** | 2 (Dual Comparator) | | **Supply Voltage (Single)** | 2.0V to 36V | | **Supply Voltage (Dual)** | ±1.0V to ±18V | | **Response Time** | 1.3 µs | | **Output Type** | Open Collector | | **Operating Temperature** | 0°C to 70°C | | **Package Type** | VSSOP-8 (DGK Designator) | --- ## 2. Functional Components The LM393DGKR consists of several critical electronic sections within its 8-pin package: ### A. Dual Independent Comparators The IC contains two separate differential voltage comparators. Each has an inverting (-) and non-inverting (+) input. They compare the voltage levels at these inputs and output a digital signal based on which is higher. ### B. Open-Collector Output Unlike standard Op-Amps, the LM393 uses an **Open-Collector** output stage. - **What this means:** The output can only "sink" current (pull to ground). - **Requirement:** A **pull-up resistor** is necessary to pull the output "High" when the comparator logic is off. - **Benefit:** This allows the output voltage level to be different from the VCC supply (e.g., comparing 12V signals but outputting to a 3.3V microcontroller). ### C. Common-Mode Input Range The input common-mode voltage range includes ground (0V), even when operating from a single supply voltage. This makes it ideal for sensing signals near 0V. --- ## 3. Pinout Configuration (VSSOP-8) Below is the standard pin mapping for the DGK package: | Pin Number | Symbol | Description | | :--- | :--- | :--- | | 1 | 1OUT | Output of Comparator 1 | | 2 | 1IN- | Inverting Input of Comparator 1 | | 3 | 1IN+ | Non-inverting Input of Comparator 1 | | 4 | GND | Ground / Negative Supply | | 5 | 2IN+ | Non-inverting Input of Comparator 2 | | 6 | 2IN- | Inverting Input of Comparator 2 | | 7 | 2OUT | Output of Comparator 2 | | 8 | VCC | Positive Supply | --- ## 4. Typical Applications Because of its versatility and low cost, the LM393DGKR is used in: * **Zero-Crossing Detectors:** Detecting when an AC signal passes 0V. * **Battery Monitors:** Triggering an LED or signal when voltage falls below a threshold. * **Square Wave Generators:** Converting sine waves or analog signals into clock pulses. * **Logic Level Shifters:** Translating high voltage logic to low voltage logic.