## Overview of ADM6346-38ARTZ-R7 The **ADM6346-38ARTZ-R7** is a high-precision, low-power **Microprocessor Supervisory Circuit** (Voltage Detector) manufactured by Analog Devices. Its primary function is to monitor power supply levels in digital systems and initiate a reset signal if the voltage falls below a predefined threshold. --- ### Core Specifications The following table summarizes the key technical parameters of the ADM6346-38ARTZ-R7: | Parameter | Value / Specification | | :--- | :--- | | **Threshold Voltage ($V_{TH}$)** | 3.80V (Typical) | | **Supply Current ($I_{CC}$)** | 1.0 $\mu$A (Ultra-low power) | | **Output Type** | Open-Drain, Active-Low ($\overline{RESET}$) | | **Reset Timeout Period** | 100 ms (Minimum) | | **Operating Voltage Range** | 1.0V to 5.5V | | **Package Type** | SOT-23-3 | | **Operating Temperature** | -40°C to +85°C | --- ### Functional Components & Pinout The device is physically simple, typically consisting of three pins: 1. **VCC**: The input power supply being monitored. 2. **GND**: Ground reference. 3. **$\overline{RESET}$**: The output signal. Since it is **Open-Drain**, it requires an external pull-up resistor to the desired logic voltage level. #### How it works: * **Monitoring**: The IC continuously compares the voltage at the $V_{CC}$ pin to an internal reference. * **Triggering**: If $V_{CC}$ drops below the 3.8V threshold, the $\overline{RESET}$ output is pulled Low. * **Recovery**: Once $V_{CC}$ rises back above the threshold, the $\overline{RESET}$ stays Low for a "timeout period" (approx. 100ms) to ensure the system clock stabilizes before the CPU starts. --- ### Key Features and Applications #### Features * **Ultra-Low Power Consumption**: Consuming only 1 $\mu$A, it is ideal for battery-operated handheld devices. * **Immunity to Transients**: It is designed to ignore fast, short-duration glitches on the $V_{CC}$ line to prevent "nuisance" resets. * **No External Components**: Aside from the pull-up resistor for the open-drain output, it requires no external capacitors or resistors to set the timing. #### Common Applications * **Microprocessor Systems**: Preventing code execution errors during power-up or brown-out conditions. * **Portable/Battery Equipment**: Monitoring Li-Ion or Alkyline battery levels. * **Intelligent Instruments**: Ensuring reliable system resets in industrial environments. --- ### Comparison with Push-Pull Variants | Feature | ADM6346 (Open-Drain) | ADM6348 (Push-Pull) | | :--- | :--- | :--- | | **Output Stage** | Requires Pull-up resistor | No resistor needed | | **Voltage Level** | Can interface with different logic levels | Tied to $V_{CC}$ | | **Wired-OR Capability** | Yes (Multiple resets can share a line) | No |