Maxim Integrated MAX6805US31D3 Microprocessor Reset Circuit

The MAX6805US31D3 is a compact, highly reliable microprocessor (µP) supervisory circuit designed to monitor power supplies in digital systems. Manufactured by Maxim Integrated, this device ensures that the µP and its associated hardware are reset cleanly when power is turned on and maintains system integrity by monitoring the power supply voltage during operation. The MAX6805US31D3 is specifically designed to provide excellent circuit reliability and low cost, making it an ideal choice for a wide range of applications, including embedded systems, computers, controllers, and intelligent instruments.

Featuring a preset V_CC reset threshold of 3.08V, the MAX6805US31D3 provides a robust solution for systems that operate at 3.3V power supply levels. With its precision voltage monitoring, it ensures that the connected microprocessor is held in the reset state until the system voltage has stabilized at the correct level for reliable operation. Once V_CC has reached the threshold level, the reset signal is kept active for a minimum of 140ms (typical) after V_CC rises above the reset threshold, providing a sufficient time for the system to stabilize.

The device comes in a compact SOT-143 package, which is highly beneficial for space-constrained applications. It operates over a wide temperature range of -40°C to +85°C, ensuring consistent performance in various environmental conditions.

Key features of the MAX6805US31D3 include:

• Low supply current of 17µA, which is ideal for battery-powered equipment.
• Immunity to short V_CC transients, providing additional system stability.
• No external components are required, simplifying design and reducing system costs.
• Active-low RESET output, which is guaranteed to be in the correct state for V_CC down to 1V.

Overall, the MAX6805US31D3 from Maxim Integrated is a reliable and cost-effective solution for system designers looking to enhance the operational stability of their digital systems. Its precision monitoring and easy integration make it a go-to component for maintaining the integrity of microprocessor-based systems.