Maxim Integrated MAX803TEXR/V+T Microprocessor Reset Circuit

The Maxim Integrated MAX803TEXR/V+T is a highly efficient and reliable microprocessor (µP) supervisory circuit designed to monitor power supplies in digital systems. It provides a significant level of protection to digital systems by ensuring that the microprocessor is reset to a known state during power-up, power-down, or brown-out conditions. This compact device is an essential component for maintaining system integrity and preventing potential issues caused by unpredictable power supply levels.

Encased in a small, 3-pin SOT23 package, the MAX803TEXR/V+T is suitable for space-constrained applications. It is tailored to offer a precise monitoring solution with a factory-trimmed reset threshold voltage. This feature ensures that systems using the MAX803TEXR/V+T can operate reliably over a wide range of supply voltages and environmental conditions.

The device has an active-low RESET output, which remains asserted for a minimum of 140ms after V<sub>CC has risen above the reset threshold level. This timeout period allows the power supply and microprocessor to stabilize before the system resumes operation. Additionally, the low power consumption of the MAX803TEXR/V+T makes it an ideal choice for portable and battery-operated devices.

Key features of the MAX803TEXR/V+T include:

• Factory-trimmed V<sub>CC reset threshold voltage for high accuracy
• Low supply current of 5µA (typical), which enhances battery life for portable devices
• Guaranteed RESET output in full temperature range of -40°C to +85°C
• Minimum 140ms reset timeout period
• Immune to short V<sub>CC transients
• No external components required for operation

The MAX803TEXR/V+T is a versatile component that can be used in a variety of applications, including computers, controllers, intelligent instruments, and portable/battery-powered equipment. Its robust design and precision make it an indispensable tool for system designers looking to enhance the reliability and performance of their digital systems.

By integrating the MAX803TEXR/V+T into their designs, engineers can ensure that their systems are protected against the uncertainties of power supply fluctuations, thus maintaining the integrity and stability of the microprocessor's operation.