LTC691ISW: A Robust Microprocessor Supervisory Circuit

The LTC691ISW, designed and manufactured by Linear Technology, is a state-of-the-art microprocessor supervisory circuit that ensures reliable operation of microprocessor (µP) systems during power failures. This integrated circuit (IC) provides a comprehensive range of features that are crucial for maintaining the integrity of the µP and associated circuitry.

Key Features and Benefits

• Precision Voltage Monitoring: The LTC691ISW is engineered to monitor power supply voltages with high accuracy, ensuring that the µP and other sensitive components are protected from unpredictable power conditions.
• Low Power Consumption: With its low quiescent current, the LTC691ISW is an ideal choice for power-sensitive applications, contributing to overall energy efficiency within the system.
• Automatic Reset Generation: Upon detection of an out-of-tolerance power supply condition, the LTC691ISW automatically generates a reset pulse to the µP, which lasts until normal voltage levels are restored plus an additional delay time. This feature is crucial for allowing the µP to restart in a known state.
• Manual Reset Input: The inclusion of a manual reset input allows for an external trigger to initiate a system reset, providing an additional layer of control for system operators or during debugging processes.
• Backup Battery Switchover: In the event of a main power failure, the LTC691ISW seamlessly switches to a backup battery, ensuring uninterrupted operation of the memory and real-time clock functions.
• Wide Operating Temperature Range: The LTC691ISW is designed to operate over a wide temperature range, making it suitable for industrial and automotive applications where extreme conditions are common.

Applications

The versatility of the LTC691ISW makes it an excellent choice for a wide range of applications, including:

• Portable and battery-powered equipment
• Computers and controllers
• Intelligent instruments
• Automotive systems
• Industrial systems

With its robust feature set, the LTC691ISW ensures that critical µP systems maintain functionality and reliability, even in the face of power supply irregularities. Its compact SW package makes it a practical choice for space-constrained applications, while its comprehensive monitoring and control capabilities make it an essential component for any system requiring high levels of operational integrity.