The **ADM1816-R23ART-RL** is a high-precision microprocessor supervisory circuit manufactured by Analog Devices. It is designed to monitor power supply voltages in microprocessor systems and provide a reset signal during power-up, power-down, and brownout conditions. --- ### 1. Key Technical Specifications | Parameter | Specification | | :--- | :--- | | **Reset Threshold** | 2.31V (Nominal) | | **Output Type** | Open-Drain with Internal Pull-up Resistor | | **Package** | SOT-23 (3-lead) | | **Supply Current** | 12 µA (Typical) | | **Reset Timeout Period** | 100 ms to 600 ms | | **Operating Temperature** | -40°C to +105°C | ### 2. Core Functionality The device serves as a "watchdog" for the system's power rail. Its primary functions include: * **Voltage Monitoring:** It continuously monitors the $V_{CC}$ pin. When the supply voltage falls below the fixed threshold (2.31V), the device triggers a reset. * **Active Low Reset:** The output remains active (Logic Low) while the voltage is below the threshold and stays low for a specific timeout period after the voltage rises above the threshold. * **Bidirectional Reset:** The ADM1816 features a unique internal structure that allows the reset pin to be used as both an output (from the supervisor) and an input (from a manual push-button or another controller). ### 3. Pin Configuration The SOT-23 package consists of three critical pins: 1. **Vcc:** Power supply input and the monitored voltage point. 2. **GND:** Ground reference. 3. **RESET:** The active-low output signal. Since it is open-drain with an internal pull-up, it can be directly wired-OR connected with other reset sources. ### 4. Application Use Cases * **Microprocessor Systems:** To ensure the MCU starts at a stable voltage. * **Computers and Controllers:** Preventing "glitchy" behavior during power-up. * **Intelligent Instruments:** Protecting data integrity during unexpected power loss. --- ### 5. Part Number Breakdown * **ADM1816:** Model series (Bidirectional Reset). * **R23:** 2.31V Threshold voltage. * **ART:** Package code for SOT-23. * **RL:** Tape and Reel packaging.