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MAX690TESA from MAXIM,MAXIM - Dallas Semiconductor

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MAX690TESA

Manufacturer: MAXIM

3.0V or 3.3V microprocessor supervisory circuit. Reset threshold 3.075V. Active-low reset. Watchdog input. Backup-battery switch. Power-fail threshold accuracy +-4%. Power-fail comparator. Reset window +-75mV

Partnumber Manufacturer Quantity Availability
MAX690TESA MAXIM 2508 In Stock

Description and Introduction

3.0V or 3.3V microprocessor supervisory circuit. Reset threshold 3.075V. Active-low reset. Watchdog input. Backup-battery switch. Power-fail threshold accuracy +-4%. Power-fail comparator. Reset window +-75mV The MAX690TESA is a microprocessor (μP) supervisory circuit manufactured by Maxim Integrated (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 Integrated (now Analog Devices)  
- **Package:** 8-pin SOIC (Small Outline Integrated Circuit)  
- **Operating Voltage Range:** 1.2V to 5.5V  
- **Reset Threshold Accuracy:** ±1.5% (typical)  
- **Reset Timeout Period:** 200ms (min)  
- **Supply Current:** 5μA (typical)  
- **Operating Temperature Range:** -40°C to +85°C  
- **Watchdog Timer:** Yes (1.6s typical timeout)  
- **Manual Reset Input:** Yes (active-low)  
- **Battery Backup Switch:** Yes (for CMOS RAM)  

### **Descriptions:**  
The MAX690TESA 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. It includes a watchdog timer, manual reset input, and a battery backup switch for CMOS RAM.  

### **Features:**  
- **Voltage Monitoring:** Monitors VCC for undervoltage conditions.  
- **Reset Output:** Active-low RESET signal during power anomalies.  
- **Watchdog Timer:** Resets the system if the watchdog is not toggled within 1.6s.  
- **Manual Reset Input:** Allows external pushbutton reset.  
- **Battery Backup Switching:** Automatically switches to backup battery when VCC fails.  
- **Low Quiescent Current:** 5μA typical for power efficiency.  
- **Wide Operating Voltage Range:** Supports 1.2V to 5.5V systems.  

This information is based solely on the manufacturer's datasheet and technical documentation.

Application Scenarios & Design Considerations

3.0V or 3.3V microprocessor supervisory circuit. Reset threshold 3.075V. Active-low reset. Watchdog input. Backup-battery switch. Power-fail threshold accuracy +-4%. Power-fail comparator. Reset window +-75mV

Alternative Part Number

  • ADM690TARZ --: Pin-compatible microprocessor supervisory circuit with reset and watchdog functions, direct functional equivalent to the MAX690 in an SOIC package.
  • DS1232LPS --: Microprocessor supervisor with reset and watchdog timing, similar supervisory functionality and widely used as a drop-in style replacement.
  • TPS3705-33DR --: Supply voltage supervisor with reset output and watchdog, offering comparable monitoring behavior for microprocessor reset applications.

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