Maxim Integrated MAX6805US26D3-T Microprocessor Reset Circuit

The MAX6805US26D3-T is a highly precise, low-power microprocessor (µP) supervisory circuit designed to monitor power supplies in µP and digital systems. Manufactured by Maxim Integrated, this component provides excellent circuit reliability and low cost by eliminating external components and adjustments when used in systems with 2.63V to 2.97V power supply voltages.

This device is particularly well-suited for portable and battery-powered applications due to its low 1.6µA supply current. The MAX6805US26D3-T ensures that the µP is only operational when the power supply is within acceptable limits, thus safeguarding the system from low voltage conditions that can lead to data corruption and erratic system behavior.

Key features of the MAX6805 include:

• Precision Factory-Set V<sub>CC Reset Thresholds: The reset threshold is preset at the factory, ensuring reliable monitoring without the need for external adjustments.
• Low Power Consumption: With a quiescent current of only 1.6µA, this device is ideal for power-sensitive applications.
• Immune to Short V<sub>CC Transients: The MAX6805 includes a built-in time delay, which helps to prevent false triggering due to short transients on the V<sub>CC line.
• Manual Reset Input: A manual reset input is provided, allowing for a system reset to be triggered by external events or user interaction.
• Compact SOT23 Packaging: The device comes in a space-saving SOT23 package, making it suitable for space-constrained applications.

The MAX6805US26D3-T functions by asserting a reset signal whenever the V<sub>CC supply voltage falls below the factory-set reset threshold. The reset output remains asserted for a preset timeout period after V<sub>CC has risen above the reset threshold, ensuring the system has stabilized before normal operation resumes.

With its combination of features, the MAX6805US26D3-T is an excellent choice for managing power-on reset functions in microcontrollers, computers, controllers, and intelligent instruments where low power consumption and high reliability are paramount.