The **UB211CG-AB-AF5-R** is a high-precision, low-power **Voltage Detector (Reset IC)** manufactured by **UTC (Unisonic Technologies Co., Ltd)**. It is primarily used to monitor power supply rails and ensure that microcontrollers or logic circuits are reset properly when the voltage drops below a safe threshold. --- ### 1. Key Technical Specifications Below are the primary parameters for this specific part number: | Parameter | Specification | | :--- | :--- | | **Detection Voltage** | Fixed threshold (Specific value depends on internal trim) | | **Output Type** | CMOS (Push-Pull) | | **Detection Accuracy** | ±2.0% | | **Low Current Consumption** | ~0.7µA (Typical) | | **Operating Voltage Range** | 0.7V to 10.0V | | **Package Type** | SOT-25 / SOT-23-5 | | **Hysteresis** | Typically 5% of Detection Voltage | --- ### 2. Functional Description The device monitors the `VDD` pin. Its operation follows a specific logic cycle: 1. **Normal State:** When the input voltage is above the detection threshold ($V_{DET}$), the output stays **High**. 2. **Detection State:** When the input voltage drops below $V_{DET}$, the output immediately switches to **Low**. 3. **Release State:** When the voltage rises above $V_{DET} + V_{HYS}$ (Hysteresis), the output returns to **High** after a short delay. ### 3. Pin Configuration (SOT-25) | Pin Number | Name | Function | | :--- | :--- | :--- | | 1 | **Vout** | Output terminal (CMOS Push-Pull) | | 2 | **Vdd** | Input voltage / Power supply | | 3 | **Vss** | Ground (GND) | | 4 | **NC / CD** | No Connection or Delay capacitor (depending on sub-series) | | 5 | **NC** | No Connection | --- ### 4. Part Number Breakdown The suffixing follows UTC's nomenclature: * **UB211**: Series name (High-precision voltage detector). * **CG**: Typically refers to specific threshold voltage and output configuration. * **AF5**: Package code for **SOT-25**. * **R**: Tape and Reel packaging. --- ### 5. Common Applications * **Microprocessor Reset:** Prevents code execution errors during brown-out conditions. * **Battery Checkers:** To signal when a battery is reaching its critical low level. * **Power Failure Detection:** To trigger data backup routines in volatile memory.