MAX691

The MAX691 is a microprocessor (µP) supervisory circuit designed to monitor the power supply and ensure reliable operation of microprocessor systems. It provides several functions including power-on reset, watchdog timer, battery backup switching, and low-battery detection. The MAX691 ensures that the microprocessor is reset whenever the supply voltage drops below a preset threshold, and it maintains the reset state until the supply voltage stabilizes. Additionally, it includes a watchdog timer to reset the system if it becomes unresponsive and a manual reset input.

Key Features:

• Monitors power supply and generates reset signal
• Precision voltage monitoring (±2% accuracy)
• Selectable reset threshold voltages
• Watchdog timer with selectable timeout periods
• Battery backup switching
• Low-battery detection
• Manual reset input
• Low quiescent current
• Small 16-pin DIP/SO package

Technical Specifications:

• Supply Voltage (VCC): 4.75V to 5.5V
• Reset Threshold Voltages: 4.65V (typical)
• Reset Timeout Period: 200ms (typical)
• Watchdog Timeout Period: 1.6s (typical)
• Manual Reset Input: Active low
• Quiescent Current: 50µA (typical)
• Operating Temperature Range: 0°C to +70°C
• Package: 16-pin DIP/SO

Applications:

• Microprocessor and Microcontroller Systems: Ensures reliable operation and resets the microprocessor during power fluctuations.
• Embedded Systems: Provides supervisory functions in embedded applications.
• Battery-Powered Devices: Manages power and reset functions in battery-operated electronics.
• Industrial Control: Maintains reliable operation of control systems.
• Consumer Electronics: Used in various consumer devices for power monitoring and reset functions.
• Automotive Systems: Supervises microprocessor operation in automotive electronics.

Datasheet:
For detailed technical information, refer to the MAX691 Datasheet.