Maxim Integrated MAX6704SKA Microprocessor Reset Circuit

The Maxim Integrated MAX6704SKA is a compact, highly reliable microprocessor (µP) supervisory circuit designed to monitor power supplies and µP activity in digital systems. It provides excellent circuit reliability and low cost by eliminating external components and adjustments when used with 5V-powered circuits.

This supervisory circuit significantly enhances system robustness by providing several key features. The MAX6704SKA asserts a reset signal whenever the VCC supply voltage falls below a preset threshold, ensuring that the µP starts up in a known state. The reset signal remains asserted for a minimum timeout period after VCC has risen above the reset threshold level, providing the system with ample time to stabilize.

The device comes in a compact SOT-23 package, making it ideal for space-constrained applications. Its small size is particularly beneficial in portable electronics where board space is at a premium. Despite its diminutive stature, the MAX6704SKA is a powerful tool for system stability, offering a manual reset input that allows for a reset to be triggered with an external switch or another logic signal, adding an extra layer of control for system designers.

Key features of the MAX6704SKA include:

• Precise monitoring of 5V power-supply voltages.
• Fully specified over temperature.
• 140ms min power-on reset pulse width.
• Manual reset input.
• Reset threshold options available for 4.63V, 4.38V, 3.08V, 2.93V, 2.63V, and 2.32V.
• Low supply current of 20µA (typical).
• Guaranteed reset valid to VCC = 1V.
• Immune to short VCC transients.
• Compact SOT-23 package.

With its robust feature set and Maxim Integrated's reputation for quality, the MAX6704SKA is an excellent choice for system designers looking to improve the reliability and performance of their 5V digital systems. Whether used in portable devices, computers, controllers, or other applications, this supervisory circuit helps ensure that systems operate as intended, even in the face of power supply fluctuations or unexpected events.