The **ADM8611N263ACBZ-R7** is a high-precision, low-power voltage supervisory circuit designed to monitor power supply levels in microprocessor-based systems. It is manufactured by Analog Devices and is commonly used in space-constrained portable electronics. --- ### 1. Key Technical Specifications The following table highlights the primary electrical characteristics of the device: | Parameter | Specification | | :--- | :--- | | **Threshold Voltage** | 2.63V (Nominal) | | **Output Type** | Open-Drain (Active Low) | | **Supply Current** | 10 $\mu$A (Typical) | | **Reset Timeout Period** | 140 ms (Minimum) | | **Input Channels** | 1 (Voltage Monitor) | | **Package Type** | 4-ball WLCSP (Wafer Level Chip Scale Package) | | **Operating Temperature** | -40°C to +85°C | --- ### 2. Functional Description The ADM8611 functions as a "Watchdog" or "Reset Generator" for digital systems. Its primary tasks include: * **Voltage Monitoring:** It continuously monitors the $V_{CC}$ pin. If the supply voltage drops below the **2.63V** threshold, the device triggers a reset signal. * **Reset Generation:** When the threshold is breached, the $\overline{RESET}$ output goes low. It remains low for the duration of the "Reset Timeout" (140ms) after the voltage returns above the threshold to ensure the system processor stabilizes. * **Manual Reset (MR):** This part includes a manual reset input, allowing a physical button or an external logic signal to force a system reset regardless of the voltage level. --- ### 3. Pinout and Internal Logic The device is extremely compact due to its WLCSP footprint. Below is a conceptual representation of its internal connections: ```mermaid graph LR VCC(VCC 2.63V) --> Comparator REF(Internal Reference) --> Comparator Comparator --> Delay_Logic MR(Manual Reset Input) --> Delay_Logic Delay_Logic --> RESET(Open-Drain Output) ``` --- ### 4. Typical Application Circuit Since the output is **Open-Drain**, a pull-up resistor is required to interface with a microcontroller (MCU). ```c // Example: Hardware Integration logic // 1. Connect VCC to the 3.3V or 3.0V rail. // 2. Connect GND to System Ground. // 3. Connect RESET pin to MCU RESET pin with a 10k-100k Ohm pull-up. // 4. (Optional) Connect MR to a tactile switch. ``` --- ### 5. Part Number Decoding The suffix **-R7** indicates the packaging format: * **ADM8611**: Model series. * **N**: No Watchdog timer (Standard supervisory). * **263**: 2.63V threshold. * **ACBZ**: WLCSP Package code. * **R7**: 7-inch tape and reel (3,000 pieces).