ON Semiconductor MAX809STRG Microprocessor Reset Monitor

The ON Semiconductor MAX809STRG is a compact, highly efficient microprocessor (μP) supervisory circuit designed to monitor power supplies in digital systems. It provides a crucial function by asserting a reset signal to the μP during power-up, power-down, and brown-out conditions, ensuring that the processor starts up in a known state every time. The MAX809STRG is an essential component for reliable system operation, particularly in applications where precise power management is critical.

This device features a fixed-sense threshold voltage that has been precisely set at the factory, making it suitable for monitoring 3V, 3.3V, and 5V power supplies. The reset output is active-low and is guaranteed to remain asserted for a minimum of 140ms after the supply voltage has risen above the reset threshold level. This timeout ensures that the system has ample time to stabilize before the processor begins operation.

Designed with versatility in mind, the MAX809STRG is compatible with a wide range of microprocessor systems and can be easily integrated into various digital applications. Its small SOT-23 package makes it an excellent choice for space-constrained applications, such as portable devices, embedded systems, and IoT products.

Key features of the MAX809STRG include:

• Low supply current of 17μA, which is ideal for power-sensitive applications.
• Wide operating voltage range, catering to various system requirements.
• Active-low RESET output, which remains asserted for 140ms (min) after VCC has risen above the reset threshold.
• Immunity to short VCC transients, ensuring reliable operation under fluctuating power conditions.
• Temperature range of -40°C to +85°C, allowing performance in extreme environmental conditions.

With its robust design and reliable performance, the ON Semiconductor MAX809STRG is an indispensable component for systems that require consistent and accurate monitoring of the power supply to maintain proper functionality. Whether used in consumer electronics, automotive systems, or industrial controls, this reset monitor offers a simple yet effective solution for system stability and recovery.