### MIC2753-RBM5: Power Supply Supervisor The **MIC2753-RBM5** is a high-performance, low-current power supply supervisor (reset IC) manufactured by Microchip Technology (formerly Micrel). It is primarily used to monitor power supplies in microprocessor and digital systems, ensuring that the system is held in a reset state until the voltage stabilizes. --- ### 1. Key Technical Specifications Below are the primary electronic characteristics of the MIC2753-RBM5: | Parameter | Specification | | :--- | :--- | | **Supply Voltage ($V_{DD}$)** | 1.0V to 6.0V | | **Supply Current ($I_{DD}$)** | 30 $\mu$A (Typical) | | **Reset Threshold ($V_{TH}$)** | 2.63V | | **Reset Timeout Period** | 140ms to 280ms (Typical) | | **Output Type** | Active-Low, Open-Drain | | **Package Type** | SOT-23-5 | | **Operating Temp Range** | -40°C to +85°C | --- ### 2. Functional Description The device integrates several critical functions into a small 5-pin package to manage system integrity: * **Voltage Monitoring:** It continuously monitors the $V_{DD}$ pin against an internal fixed reference. If the voltage drops below the 2.63V threshold, the `/RESET` output is asserted. * **Reset Delay (Time Delay):** Once $V_{DD}$ rises above the threshold, the device keeps the `/RESET` signal active for a specific "timeout period" (approx. 140ms). This ensures that the power supply has fully stabilized before the CPU begins executing code. * **Manual Reset (MR):** The "R" in the part number often indicates features including a Manual Reset input. This allows a pushbutton switch or external logic to trigger a system reset regardless of the voltage level. * **Open-Drain Output:** The output requires an external pull-up resistor. This allows for "wired-OR" logic, where multiple supervisors can be connected to the same reset line. --- ### 3. Pin Configuration (SOT-23-5) The electronic connectivity for the MIC2753-RBM5 is generally mapped as follows: 1. **/RESET**: The active-low output signal. 2. **GND**: Ground reference. 3. **MR**: Manual Reset input (Active-Low). 4. **$V_{DD}$**: The supply voltage being monitored. 5. **NC / NC**: No internal connection (or sometimes used for specialized factory trimming). --- ### 4. Common Applications * **Microprocessor Systems:** Prevents erratic code execution during power-up/down. * **Critical Controllers:** Used in automotive or industrial settings where voltage dips (brownouts) could cause system crashes. * **Battery Powered Devices:** Due to its low 30 $\mu$A current draw, it is ideal for extending battery life in portable electronics. ---