The **ADM1816-R23ARTZ-R72** is a microprocessor supervisory circuit designed to monitor power supply voltages in computer and digital systems. It primarily functions as a reset generator to ensure a system starts or resets under safe voltage conditions. --- ### 1. Key Technical Specifications | Parameter | Specification | | :--- | :--- | | **Manufacturer** | Analog Devices | | **Reset Threshold** | 2.31V (Nominal) | | **Supply Voltage (Vcc)** | 1.0V to 5.5V | | **Output Type** | Push-Pull, Active Low | | **Reset Timeout Period** | 100 ms to 600 ms (Typical: 150 ms) | | **Mounting Type** | Surface Mount (SMT) | | **Package / Case** | SOT-23-3 | --- ### 2. Core Functional Parts The internal architecture of the ADM1816 consists of several critical stages: #### A. Voltage Reference & Comparator The chip contains a precise internal voltage reference. The comparator continuously checks the voltage at the **Vcc pin** against this reference. * **Threshold Monitoring:** Since this is the "R23" variant, it triggers when the voltage drops below approximately **2.31V**. #### B. Reset Generator (Delay Circuit) To prevent "chatter" or false resets caused by noise, the device includes a built-in timer. * Once Vcc rises above the threshold, the device waits for a **Reset Timeout Period** (approx. 150ms) before releasing the reset signal. This ensures the power supply has stabilized. #### C. Output Stage (Active Low) The ADM1816-R23 features a **Push-Pull** output configuration. * **Logic:** When the voltage is too low, the `/RESET` pin is pulled Low (0V). * **Push-Pull:** Unlike "Open-Drain" versions, this part does not require an external pull-up resistor to drive the signal high; it can source current itself. --- ### 3. Part Number Decoder Understanding the suffix helps in identifying specific features: | Code | Meaning | | :--- | :--- | | **ADM1816** | Series: Microprocessor Supervisory Circuit | | **R23** | Reset Threshold Voltage (2.31V) | | **ARTZ** | Package Type (SOT-23) and RoHS compliance | | **R7** | Packaging format (7-inch Reel, typically 3,000 units) | --- ### 4. Typical Application Circuit The connection is straightforward, requiring minimal external components. ```c [VCC (2.5V/3.3V Rail)] | +-----+-----+ | Vcc | | | (To MCU Reset Pin) | ADM1816 |/RESET ----------------------> | | | GND | +-----+-----+ | [GND] ``` ---