ON Semiconductor MAX809SN232T1 Microprocessor Reset Monitor

The ON Semiconductor MAX809SN232T1 is a compact and efficient microprocessor (μP) supervisory circuit designed to monitor power supplies in digital systems. It provides a crucial function by ensuring that the μP and its associated hardware are reset to a known, stable state in the event of a power failure or brownout condition. This device is particularly useful in providing a reliable startup for microprocessors that require an active-low reset signal.

With a preset threshold voltage of 2.32V, the MAX809SN232T1 is tailored to operate over a wide range of power supply voltages while maintaining precision monitoring. This makes it an excellent choice for portable and battery-powered equipment, where consistent and reliable operation is paramount.

The device features an active-low RESET output, which remains asserted for a minimum of 140ms after VCC has risen above the reset threshold level. This ensures that the system has sufficient time to stabilize before the microprocessor starts to execute code. The RESET output is guaranteed to be in the correct state for VCC down to 1.0V, which provides additional security for low-voltage operations.

Designed with simplicity in mind, the MAX809SN232T1 does not require any external components to operate. Its small SOT-23 packaging makes it an ideal choice for space-constrained applications, while still delivering the robust performance expected from ON Semiconductor products. The device's low supply current of 20μA (typical) also helps to preserve battery life in portable applications.

Key features of the MAX809SN232T1 include:

• Preset Reset Threshold Voltage: 2.32V
• Minimum Reset Pulse Duration: 140ms
• Low Supply Current: 20μA (typical)
• Guaranteed Reset Valid to VCC = 1.0V
• No External Components Required
• Compact SOT-23 Packaging

This reset monitor is an essential component for ensuring the reliability and proper startup behavior of microprocessor-based systems. Whether used in computers, controllers, or portable devices, the ON Semiconductor MAX809SN232T1 provides a simple and effective solution for system reset management.