ON Semiconductor MAX809SN293D1T1G Microprocessor Reset Monitor

The MAX809SN293D1T1G is a compact, highly reliable microprocessor (μP) supervisory circuit designed and manufactured by ON Semiconductor. This device is engineered to monitor the power supplies in μP and digital systems, providing a significant layer of protection by ensuring a proper system reset. It is an ideal component for managing system integrity during power-up, operation, and power-down states.

This supervisory circuit operates by monitoring the VCC voltage level. When this voltage drops below the minimum VCC threshold, the MAX809SN293D1T1G asserts a reset signal, which remains asserted until the VCC voltage exceeds the threshold and a preset timeout period has elapsed. This ensures that the μP or digital system has adequate time to stabilize and start up correctly after a brown-out or power interruption.

The MAX809SN293D1T1G comes in a compact SOT-23 package, making it suitable for space-constrained applications. The device features a fixed sense threshold voltage of 2.93V, tailored for systems that operate around this voltage level. Additionally, it boasts a low supply current of only 20 μA (typical), contributing to the overall power efficiency of the system it is integrated into.

Key features of the MAX809SN293D1T1G include:

• Fixed reset threshold voltage of 2.93V, suitable for 3V logic systems.
• Low supply current of 20 μA, enhancing system power efficiency.
• Guaranteed reset valid down to VCC = 1.0V, ensuring reliable operation under low-voltage conditions.
• Reset timeout period of 140 ms (minimum), providing ample time for system stabilization.
• Operating temperature range from -40°C to +105°C, suitable for industrial applications.
• Immunity to short VCC transients, ensuring robust performance.

Applications for the MAX809SN293D1T1G include a wide range of products where reliable system operation is critical, such as computers, controllers, intelligent instruments, portable/battery-powered equipment, and other μP-based systems. By integrating this reset monitor, designers can enhance the operational stability and reliability of their systems, safeguarding against the potential pitfalls of unpredictable power supply conditions.

ON Semiconductor's commitment to quality ensures that the MAX809SN293D1T1G reset monitor is a dependable choice for maintaining system integrity across various electronic applications.