ON Semiconductor MAX809SQ400T1G Microprocessor Reset Monitor

The MAX809SQ400T1G is a compact, highly efficient microprocessor (µP) supervisory circuit designed and manufactured by ON Semiconductor, a leader in energy-efficient innovations. This device is engineered to monitor the power supplies in µP and digital systems, providing a significant layer of protection against low voltage conditions that could lead to system errors and instability.

This supervisory circuit is specifically designed to assert a reset signal whenever the V<sub>CC supply voltage declines below the preset threshold of 4.00V, ensuring that the µP resets cleanly during power-up, power-down, and brown-out conditions. The reset signal remains asserted for an adequate period after V<sub>CC has risen above the reset threshold level, providing a stable environment for the µP to initialize.

The MAX809SQ400T1G comes in a compact SOT-323 package, which is well-suited for space-constrained applications. Its low power consumption makes it an ideal choice for portable and battery-powered equipment. The device's features include:

• Precision Monitoring: It offers a precise monitoring of 4.00V power supplies.
• Reset Timeout: It has a 140 ms minimum power-on reset pulse width which ensures reliable system reset.
• Low Power Consumption: The low supply current of 20 µA (typical) makes it suitable for power-sensitive applications.
• Temperature Performance: It operates over a wide temperature range of -40°C to +105°C, accommodating various operating environments.
• Versatility: The device is designed to support a variety of microprocessor systems with its active-low, open-drain reset output.

ON Semiconductor's MAX809SQ400T1G is an essential component for system reliability and robustness, ensuring that digital systems remain operational and safe in the face of power supply inconsistencies. By integrating this reset monitor, designers can enhance the performance and dependability of their systems, particularly in applications where precise voltage monitoring is critical.

Whether you are working on consumer electronics, industrial controls, or portable devices, the MAX809SQ400T1G is an excellent choice for maintaining system integrity through its effective power monitoring capabilities.