The **ADM6348-39ARTZ-R7** is a low-power, microprocessor supervisory circuit designed to monitor power supply voltage levels in digital systems. It ensures that the system starts or resets reliably when the supply voltage falls below a specific threshold. ### 1. Key Technical Specifications | Parameter | Specification | |:---|:---| | **Manufacturer** | Analog Devices Inc. (ADI) | | **Threshold Voltage** | 3.9V (Fixed) | | **Reset Type** | Open-Drain, Active-Low | | **Reset Timeout** | 100 ms (minimum) | | **Supply Current** | 1 µA (Typical) | | **Operating Temperature** | -40°C to +85°C | | **Package / Case** | SOT-23-3 (Surface Mount) | --- ### 2. Functional Description The primary role of this component is to prevent "brownout" conditions and ensure proper system initialization. * **Voltage Monitoring:** The device continuously monitors the $V_{CC}$ pin. If the voltage drops below the fixed **3.9V** threshold, the reset output ($RESET$) is triggered. * **Reset Assertion:** The reset signal remains active as long as $V_{CC}$ is below the threshold. * **Reset Timeout:** Once $V_{CC}$ rises above 3.9V, the device keeps the reset signal active for a minimum of **100 ms**. This delay allows the system clock and power supply to stabilize before the processor begins executing code. * **Open-Drain Output:** Because it uses an open-drain configuration, it requires an external pull-up resistor (typically connected to the I/O voltage of the processor). --- ### 3. Pin Configuration (SOT-23) | Pin No. | Name | Description | |:---:|:---|:---| | 1 | **GND** | Ground reference. | | 2 | **RESET** | Active-low output. Remains low when $V_{CC}$ is below threshold. | | 3 | **Vcc** | Power supply input and the voltage being monitored. | --- ### 4. Common Applications * **Microprocessor Systems:** Providing a clean startup signal. * **Embedded Controllers:** Protecting memory from corruption during power-down. * **Battery-Powered Equipment:** Due to the extremely low 1 µA current draw. * **Intelligent Instruments:** Ensuring reliable operation in noisy electrical environments. --- ### 5. Part Number Breakdown * **ADM6348**: Series identifier (Microprocessor Supervisory Circuit). * **39**: Indicates the **3.9V** threshold voltage. * **ARTZ**: Package code (SOT-23) and RoHS compliance. * **R7**: Packaging format (7-inch Reel, typically 3000 pieces).