## Technical Overview of ADM6306D331ARJZ-R7 The **ADM6306D331ARJZ-R7** is a high-reliability supervisory circuit (reset IC) manufactured by **Analog Devices**. It is designed to monitor power supply voltage levels in microprocessor-based systems, ensuring the system remains in a safe state during power-up, power-down, or brownout conditions. --- ### 1. Key Technical Specifications | Feature | Specification | | :--- | :--- | | **Function** | Dual-Voltage Supervisory Circuit | | **Threshold Voltage (V_TH)** | 3.08V (Standard for 3.3V rails) | | **Secondary Input** | Adjustable (via external resistor divider) | | **Reset Timeout Delay** | 140 ms (minimum) | | **Output Type** | Open-Drain, Active-Low | | **Supply Current** | 7 µA (Typical) | | **Operating Temperature** | -40°C to +125°C | | **Package** | 5-lead SOT-23 | --- ### 2. Functional Components The device consists of several critical electronic building blocks: 1. **Precision Voltage Reference:** Used to compare the incoming $V_{CC}$ against a highly stable internal benchmark. 2. **Comparator Circuitry:** Constantly monitors the $V_{CC}$ and the adjustable input ($V_{IN}$) to detect if they fall below the threshold. 3. **Digital Delay Generator:** Once the voltage returns to a safe level, this internal timer holds the RESET signal for a fixed duration (140ms) to allow the system clock to stabilize. 4. **Open-Drain Output Stage:** Since the output is open-drain, it requires an external pull-up resistor. This allows for "wired-OR" logic and level shifting. --- ### 3. Pin Configuration | Pin Number | Name | Description | | :--- | :--- | :--- | | 1 | $\overline{RESET}$ | Active-low logic output. | | 2 | GND | Ground. | | 3 | $\overline{MR}$ | Manual Reset input (Active-low). | | 4 | $V_{IN}$ | Adjustable monitor input for a second voltage rail. | | 5 | $V_{CC}$ | Power supply and monitored voltage input. | --- ### 4. Part Number Breakdown Understanding the suffix codes: * **ADM6306:** The base functional series (Dual voltage monitor). * **D3:** Indicates the Reset Timeout period (approx. 140ms - 280ms). * **31:** Represents the $V_{CC}$ threshold (3.08V). * **ARJZ:** Refers to the SOT-23 package type and temperature range. * **R7:** Indicates the packaging format (7-inch Tape and Reel, 3000 pieces). --- ### 5. Application Circuit Example To use this part, a typical implementation involves connecting a pull-up resistor to the $\overline{RESET}$ pin and a resistor divider to the $V_{IN}$ pin to monitor a secondary rail (e.g., a 1.8V core voltage). ```cpp // Logic Representation if (VCC < 3.08V || VIN < 0.6V) { Assert_Reset(); // Pulls RESET pin to GND } else { Wait(140ms); // Delay for stability Release_Reset(); // High-Z state (pulled high by resistor) } ```