The **ADM6346-39ARTZ-R7** is a low-power, precision voltage monitoring device manufactured by **Analog Devices**. It is primarily used as a microprocessor supervisory circuit to monitor system voltages and provide a reset signal when necessary. --- ### 1. Key Technical Specifications Below are the primary electrical characteristics of the component: | Parameter | Specification | | :--- | :--- | | **Reset Threshold** | 3.9V (Nominal) | | **Output Type** | Open-Drain (Active-Low) | | **Supply Current** | 1 µA (Typical) | | **Operating Voltage Range** | 1.0V to 5.5V | | **Reset Timeout Period** | 100 ms (Minimum) | | **Package / Case** | SOT-23-3 | | **Operating Temperature** | -40°C to +85°C | --- ### 2. Functional Description The ADM6346 is designed to protect electronic systems during power-up, power-down, and brownout conditions. #### Core Functions: * **Voltage Monitoring:** It continuously monitors the $V_{CC}$ supply. * **Reset Assertion:** If $V_{CC}$ falls below the preset threshold (3.9V), the **RESET** output goes low. * **Power-on Reset:** When power is first applied, the device keeps the system in reset for a fixed period (100ms) after $V_{CC}$ rises above the threshold to ensure the system clock and voltage have stabilized. * **Glitch Immunity:** It is designed to ignore fast, short-duration transients on the $V_{CC}$ line to prevent "nuisance" resets. --- ### 3. Pin Configuration The device is housed in a small 3-pin SOT-23 package, making it ideal for space-constrained applications. | Pin Number | Name | Function | | :--- | :--- | :--- | | 1 | **GND** | Ground | | 2 | **RESET** | Active-Low Output. Open-drain; requires a pull-up resistor. | | 3 | **Vcc** | Supply Voltage / Monitor Input. | --- ### 4. Implementation Details Because the output is **Open-Drain**, you must connect a pull-up resistor (typically 10kΩ to 100kΩ) to a voltage source. This allows the reset signal to interface with different logic levels (e.g., pulling up to 3.3V even if the monitored rail is 5V). ```python # Conceptual Truth Table # ---------------------- # Condition: Vcc > Threshold (3.9V) -> RESET = High (via Pull-up) # Condition: Vcc < Threshold (3.9V) -> RESET = Low (GND) ``` --- ### 5. Common Applications * Microprocessor and Microcontroller systems. * Computers and Controllers. * Intelligent Instruments. * Portable/Battery-Powered Equipment (due to the ultra-low 1µA current consumption).