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MAX691ACWE from MAXIM,MAXIM - Dallas Semiconductor

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MAX691ACWE

Manufacturer: MAXIM, MAXIN, MAXAM, MAX

Microprocessor Supervisory Circuits
Partnumber Manufacturer Quantity Availability
MAX691ACWE MAXIM, MAXIN, MAXAM, MAX 1233 In Stock

Description and Introduction

Microprocessor Supervisory Circuits The MAX691ACWE is a microprocessor (μP) supervisory circuit manufactured by Maxim Integrated. Below are its specifications, descriptions, and features:

### **Specifications:**
- **Manufacturer:** Maxim Integrated  
- **Part Number:** MAX691ACWE  
- **Package:** 16-pin Wide SOIC (SO-16)  
- **Operating Voltage Range:** 1.2V to 5.5V  
- **Reset Threshold Voltage Options:** Adjustable or fixed (factory-set)  
- **Reset Timeout Period:** 200ms (typical)  
- **Operating Temperature Range:** -40°C to +85°C  
- **Quiescent Current:** 35μA (typical)  
- **Watchdog Timer:** Programmable timeout period (1.6s default)  
- **Manual Reset Input:** Active-low (MR)  
- **Battery Backup Switchover:** Automatic  

### **Descriptions:**
The MAX691ACWE is a comprehensive μP supervisory circuit designed to monitor power supply voltages, manage reset functions, and provide battery backup switching. It ensures reliable system operation by generating a reset signal during power-up, power-down, or brownout conditions. It also includes a watchdog timer to detect software crashes and a manual reset input for user-initiated resets.  

### **Features:**
1. **Voltage Monitoring:** Monitors VCC and generates a reset signal if voltage drops below a preset threshold.  
2. **Battery Backup Switching:** Automatically switches to backup battery when VCC fails.  
3. **Watchdog Timer:** Detects system lockups with a default 1.6s timeout (adjustable via external capacitor).  
4. **Low Power Consumption:** 35μA typical supply current.  
5. **Manual Reset Input:** Allows external pushbutton reset.  
6. **Reset Output:** Active-low RESET signal with 200ms delay.  
7. **Wide Operating Voltage Range:** Supports 1.2V to 5.5V systems.  
8. **Industrial Temperature Range:** Operates from -40°C to +85°C.  

This device is commonly used in embedded systems, industrial controls, and battery-backed applications requiring reliable power management.  

(Note: Always refer to the official datasheet for precise details.)

Application Scenarios & Design Considerations

Microprocessor Supervisory Circuits

Alternative Part Number

  • ADM691AARWZ --: Pin-compatible microprocessor supervisory circuit with the same reset and watchdog functions, from the original Maxim product line now owned by Analog Devices.
  • LTC1232CS8 --: Similar microprocessor supervisor with reset and watchdog timing, suitable as a functional replacement in most supervisory applications.
  • DS1232LPS --: Microprocessor monitor with reset and watchdog features, offering comparable supervisory behavior for power-on reset designs.
  • LTC691CSW --: Similar microprocessor supervisory circuit offering reset and watchdog functions in a 16-lead SOIC wide-body package; a viable cross-series substitute when exact timing tolerances allow.
  • TL7705ACP --: Widely available supply-voltage supervisor with reset output; usable as a functional substitute in many supervisory roles, though pinout and feature set differ, so layout changes are required.
  • DS1232LP+ --: Low-power microprocessor monitor with reset and watchdog in a small SOIC package; good substitute for supervisory duties though pinout differs, requiring layout review.
  • ADM691AARW --: Pin-compatible microprocessor supervisory circuit with reset and watchdog functions, widely available and functionally equivalent to the MAX691A.

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