3.0V or 3.3V microprocessor supervisory circuit. Reset threshold 2.625V. Active-high reset. Watchdog input. Backup-battery switch. Power-fail threshold accuracy +-4%. Power-fail comparator. Reset window +-75mV The **MAX805RESA** is a microprocessor (μP) supervisory circuit manufactured by **Maxim Integrated (now part of Analog Devices)**.  

### **Specifications:**  
- **Manufacturer:** Maxim Integrated  
- **Type:** Microprocessor Supervisor  
- **Output Type:** Active-Low, Push-Pull  
- **Reset Threshold Voltage:** 4.63V (typical)  
- **Operating Voltage Range:** 1.2V to 5.5V  
- **Reset Timeout Period:** 140ms (minimum)  
- **Package:** 8-pin SOIC (Small Outline Integrated Circuit)  
- **Operating Temperature Range:** -40°C to +85°C  
- **Quiescent Current:** 12μA (typical)  

### **Descriptions:**  
The MAX805RESA monitors system voltage levels and provides a reset signal to the microprocessor when the supply voltage drops below a preset threshold. It ensures proper system initialization and prevents data corruption during power-up, power-down, or brownout conditions.  

### **Features:**  
- Precision voltage monitoring for 5V, 3.3V, and 3V systems  
- Low quiescent current (12μA typical)  
- No external components required  
- Guaranteed reset output valid down to **VCC = 1V**  
- Manual reset input option  
- Immune to short VCC transients  

This device is commonly used in embedded systems, industrial controls, and battery-powered applications where reliable power monitoring is critical.  

Would you like additional details on any specific aspect?

3.0V or 3.3V microprocessor supervisory circuit. Reset threshold 2.625V. Active-high reset. Watchdog input. Backup-battery switch. Power-fail threshold accuracy +-4%. Power-fail comparator. Reset window +-75mV