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MAX690RESA from MAXIM,MAXIM - Dallas Semiconductor

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MAX690RESA

Manufacturer: MAXIM

3.0V or 3.3V microprocessor supervisory circuit. Reset threshold 2.625V. Active-low reset. Watchdog input. Backup-battery switch. Power-fail threshold accuracy +-4%. Power-fail comparator. Reset window +-75mV
Partnumber Manufacturer Quantity Availability
MAX690RESA MAXIM 118 In Stock

Description and Introduction

3.0V or 3.3V microprocessor supervisory circuit. Reset threshold 2.625V. Active-low reset. Watchdog input. Backup-battery switch. Power-fail threshold accuracy +-4%. Power-fail comparator. Reset window +-75mV The MAX690RESA is a microprocessor (µP) supervisory circuit manufactured by Maxim Integrated (now part of Analog Devices). Below are the factual details about the part:

### **Manufacturer:**  
- **MAXIM** (now part of Analog Devices)  

### **Specifications:**  
- **Part Number:** MAX690RESA  
- **Package:** 8-pin SOIC (Small Outline Integrated Circuit)  
- **Supply Voltage Range:** 1.2V to 5.5V  
- **Reset Threshold Options:** Adjustable or fixed (factory-set)  
- **Reset Timeout Period:** 200ms (typical)  
- **Operating Temperature Range:** -40°C to +85°C  
- **Quiescent Current:** 12µA (typical)  
- **Manual Reset Input:** Yes (active-low)  
- **Watchdog Timer:** Yes (1.6s timeout, typical)  
- **Battery Backup Switch:** Yes (for CMOS RAM or real-time clock backup)  

### **Descriptions:**  
The MAX690RESA is a low-power µP supervisory circuit designed to monitor power supply voltages in microprocessor-based systems. It provides reset signals during power-up, power-down, and brownout conditions to ensure proper system operation. The device includes a watchdog timer, manual reset input, and a backup battery switch for data retention.  

### **Features:**  
- **Power Supply Monitoring:** Ensures µP reset during voltage drops.  
- **Low Quiescent Current:** 12µA (typical) for power efficiency.  
- **Watchdog Timer:** Prevents system lockup by requiring periodic µP activity.  
- **Battery Backup Switching:** Automatically switches to backup power during main power failure.  
- **Manual Reset Input:** Allows external reset triggering.  
- **Wide Supply Voltage Range:** Operates from 1.2V to 5.5V.  
- **Industrial Temperature Range:** -40°C to +85°C.  

This information is sourced from the manufacturer's datasheet and technical documentation.

Application Scenarios & Design Considerations

3.0V or 3.3V microprocessor supervisory circuit. Reset threshold 2.625V. 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 series.
  • DS1232 --: Microprocessor supervisor providing reset and watchdog timing, widely used as a drop-in replacement for MAX690-type supervisors.
  • TL7705ACP --: Supply voltage supervisor with reset output, suitable alternative when watchdog is not required and a different series is preferred.
  • ADM690AARNZ --: Pin-compatible microprocessor supervisory circuit with reset and watchdog functions, direct functional equivalent in an 8-pin SOIC package.
  • DS1232LPS-2 --: Microprocessor supervisor with reset and watchdog timing, similar supervisory role and widely available as a drop-in style replacement.
  • TL7705ACD --: Supply voltage supervisor with reset output, commonly used as a substitute for reset/supervisory functions in similar applications.

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