## ADM6346-42ARTZ-R7 Overview The **ADM6346-42ARTZ-R7** is a low-power, precision voltage detector manufactured by Analog Devices. It is primarily used for monitoring power supply voltages in microprocessor systems to provide a reset signal during power-up, power-down, and brownout conditions. --- ### Core Specifications | Feature | Specification | | :--- | :--- | | **Reset Threshold** | 4.2V (Typical) | | **Output Type** | Open-Drain, Active-Low | | **Supply Current** | 1 µA (Typical) | | **Reset Timeout Period** | 100 ms (Minimum) | | **Package / Case** | SOT-23-3 | | **Operating Temperature** | -40°C to +85°C | --- ### Key Internal Components & Functionality #### 1. Precision Voltage Reference The heart of the chip is a temperature-compensated voltage reference. It compares the incoming voltage on the $V_{CC}$ pin against a fixed internal threshold (in this specific model, **4.2V**). #### 2. Comparator with Hysteresis To prevent "chattering" (rapid toggling) of the reset signal when the supply voltage is hovering exactly at the threshold, the device includes internal hysteresis. This ensures the output remains stable despite small amounts of noise on the power rail. #### 3. Open-Drain Output Stage The "Active-Low" open-drain output requires an external pull-up resistor to the desired logic voltage level. - **When $V_{CC}$ > 4.2V:** The output is High (pulled up). - **When $V_{CC}$ < 4.2V:** The output is pulled to Ground (Low). #### 4. Delay Generator Once the supply voltage rises above the 4.2V threshold, the chip does not release the reset signal immediately. It waits for a fixed **Reset Timeout Period** (typically 100ms or more) to ensure the system clock and power supply have fully stabilized. --- ### Typical Application Circuit In a standard microprocessor application, the wiring is minimal: ```markdown VCC (5V Rail) ----+----[ R_pullup ]----+ | | [ ADM6346-42 ] [ Microcontroller ] [ VCC ] [ RESET Pin ] [ GND ] [ GND ] [ /RESET ]-------------+ ``` --- ### Key Advantages * **Ultra-Low Power:** At 1 µA, it is ideal for battery-operated devices. * **No External Parts:** Aside from a pull-up resistor, it requires no external capacitors or timing components. * **Reliability:** Replaces discrete transistor/resistor reset circuits which are often inaccurate across temperature ranges.