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MAX690SESA from ST,ST Microelectronics

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MAX690SESA

Manufacturer: ST, MAXIM, MAXIM

3.0V or 3.3V microprocessor supervisory circuit. Reset threshold 2.925V. Active-low reset. Watchdog input. Backup-battery switch. Power-fail threshold accuracy +-4%. Power-fail comparator. Reset window +-75mV

Partnumber Manufacturer Quantity Availability
MAX690SESA ST, MAXIM, MAXIM 4380 In Stock

Description and Introduction

3.0V or 3.3V microprocessor supervisory circuit. Reset threshold 2.925V. Active-low reset. Watchdog input. Backup-battery switch. Power-fail threshold accuracy +-4%. Power-fail comparator. Reset window +-75mV The **MAX690SESA** is a microprocessor (μP) supervisory circuit manufactured by **MAXIM** (now part of Analog Devices). Below are its specifications, descriptions, and features based on factual information from Ic-phoenix technical data files:  

### **Specifications:**  
- **Manufacturer:** MAXIM (now Analog Devices)  
- **Package:** 8-pin SOIC (Small Outline Integrated Circuit)  
- **Operating Voltage Range:** 1.2V to 5.5V  
- **Reset Threshold Voltage:** Adjustable or fixed (specific value depends on variant)  
- **Reset Timeout Period:** Typically 200ms (adjustable in some versions)  
- **Watchdog Timer:** Yes (with programmable timeout)  
- **Manual Reset Input:** Yes (active-low)  
- **Power-Fail Comparator:** Yes (for early warning of power failure)  
- **Operating Temperature Range:** -40°C to +85°C  

### **Descriptions:**  
The **MAX690SESA** is a μP supervisory circuit designed to monitor power supply voltages in microprocessor-based systems. It ensures proper system operation by generating a reset signal during power-up, power-down, or brownout conditions. It includes a watchdog timer to detect software lockups and a power-fail comparator for early warning of voltage drops.  

### **Features:**  
- **Voltage Monitoring:** Monitors VCC for undervoltage conditions.  
- **Reset Output:** Active-low RESET signal for μP initialization.  
- **Watchdog Timer:** Prevents system lockup by requiring periodic toggling.  
- **Manual Reset Input:** Allows external pushbutton reset.  
- **Power-Fail Comparator:** Provides early warning of impending power loss.  
- **Low Quiescent Current:** Typically 50μA (minimizes power consumption).  
- **Wide Operating Voltage Range:** Supports 1.2V to 5.5V systems.  

This information is based solely on the manufacturer's datasheet and technical documentation. For detailed electrical characteristics and application circuits, refer to the official datasheet.

Application Scenarios & Design Considerations

3.0V or 3.3V microprocessor supervisory circuit. Reset threshold 2.925V. Active-low reset. Watchdog input. Backup-battery switch. Power-fail threshold accuracy +-4%. Power-fail comparator. Reset window +-75mV

Alternative Part Number

  • ADM690AN --: Pin-compatible microprocessor supervisory circuit with reset and watchdog functions, direct functional equivalent to the MAX690.
  • DS1232 --: Microprocessor supervisor with reset and watchdog timer, widely used as a drop-in functional replacement in supervisory applications.
  • TL7705ACP --: Supply voltage supervisor with reset output, suitable alternative for power-on reset and brown-out monitoring functions.

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