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MAX690ACSA from MAXIM,MAXIM - Dallas Semiconductor

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MAX690ACSA

Manufacturer: MAXIM, MAX

Microprocessor Supervisory Circuits

Partnumber Manufacturer Quantity Availability
MAX690ACSA MAXIM, MAX 3196 In Stock

Description and Introduction

Microprocessor Supervisory Circuits The MAX690ACSA 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  
- **Package:** 8-pin SOIC (Small Outline Integrated Circuit)  
- **Supply Voltage Range:** 1.2V to 5.5V  
- **Reset Threshold Options:** Factory-set (e.g., 4.65V for 5V systems)  
- **Reset Timeout Period:** Adjustable or fixed (typically 200ms)  
- **Operating Temperature Range:** -40°C to +85°C  
- **Quiescent Current:** Low (typically 35µA)  
- **Watchdog Timer:** Yes (programmable timeout)  
- **Manual Reset Input:** Yes (active-low)  
- **Battery Backup Switch:** Yes (for CMOS RAM backup)  
- **Power-Fail Comparator:** Yes (for early warning of power loss)  

### **Descriptions:**  
The MAX690ACSA 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 if the supply voltage falls below a preset threshold. It also includes a watchdog timer, manual reset input, and battery backup switching for CMOS RAM.  

### **Features:**  
- **Voltage Monitoring:** Monitors VCC and asserts reset if voltage drops below threshold.  
- **Watchdog Timer:** Prevents system lock-up by requiring periodic toggling.  
- **Manual Reset Input:** Allows external pushbutton reset.  
- **Battery Backup Switching:** Automatically switches to backup battery during power loss.  
- **Power-Fail Comparator:** Provides early warning for orderly system shutdown.  
- **Low Power Consumption:** Ideal for battery-powered applications.  
- **Wide Operating Voltage Range:** Supports 1.2V to 5.5V systems.  

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

Application Scenarios & Design Considerations

Microprocessor Supervisory Circuits

Alternative Part Number

  • ADM690AN --: Pin-compatible microprocessor supervisory circuit with reset and watchdog functions, direct functional equivalent to the MAX690A.
  • DS1232 --: Microprocessor supervisor with reset and watchdog timer, widely used as a drop-in substitute for MAX690-series supervisors.
  • TL7705ACP --: Supply voltage supervisor with reset output, similar supervisory function and commonly used as an alternative in reset circuits.
  • MC34064P-5 --: Undervoltage sensing circuit providing reset output, suitable as a lower-cost alternative for supply monitoring applications.

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