## Technical Overview of ADM6348-40ARTZ-R7 The **ADM6348-40ARTZ-R7** is a precision voltage monitoring device (Reset IC) manufactured by **Analog Devices**. It is designed to monitor power supply voltage levels in microprocessor-based systems and initiate a reset during power-up, power-down, and brownout conditions. --- ### 1. Key Technical Specifications | Parameter | Specification | | :--- | :--- | | **Function** | Simple Reset/Power-On Reset | | **Threshold Voltage ($V_{TH}$)** | 4.0V (indicated by the "-40" in the part number) | | **Supply Voltage Range** | 1.0V to 5.5V | | **Output Type** | Open-Drain, Active-Low | | **Reset Timeout Period** | 100 ms (minimum) | | **Supply Current** | 7 µA (Typical) | | **Package Type** | SOT-23-3 | | **Temperature Range** | -40°C to +85°C | --- ### 2. Core Functional Components The internal architecture consists of several critical electronic stages: 1. **Precision Voltage Reference:** An internal bandgap reference provides a stable voltage to compare against the $V_{CC}$ input. 2. **Comparator:** This circuit continuously compares the monitored supply voltage to the 4.0V threshold. It includes **hysteresis** to prevent "chattering" (rapid switching) if the power supply is noisy. 3. **Time Delay Circuit:** Once the supply voltage rises above the threshold, an internal timer holds the RESET signal for at least 100ms. This ensures the system clock and power rails have stabilized before the processor starts. 4. **Open-Drain Output:** The output stage uses an N-channel MOSFET. Because it is **Open-Drain**, it requires an external **pull-up resistor** to a specific voltage rail (usually the same as $V_{CC}$). --- ### 3. Application Circuit Diagram (Conceptual) ```text VCC (5V Rail) | +-------+-----------+ | | | [ R ] [ADM6348] [Microcontroller] Pull-up | | | | | | | | | +-------|RT |-------|RST| (Reset Input) | | | | GND GND GND GND ``` --- ### 4. Part Number Breakdown Understanding the nomenclature helps in identifying variants: * **ADM6348**: The base model family (Open-drain, active-low reset). * **40**: The nominal threshold voltage (4.0V). * **ARTZ**: Package code (SOT-23) and Lead-Free designation. * **R7**: Packaging format (7-inch Tape and Reel, typically 3,000 pieces). --- ### 5. Common Use Cases * **Microprocessor Systems:** To prevent erratic execution during power fluctuations. * **Intelligent Instruments:** Ensuring the device starts in a known state. * **Automotive/Industrial:** Monitoring 5V logic rails that may dip below stable operating levels.