Maxim Integrated MAX6721UTVDD3+T Microprocessor Supervisory Circuit

The Maxim Integrated MAX6721UTVDD3+T is a highly reliable microprocessor (µP) supervisory circuit designed to monitor power supplies and microprocessor activity in digital systems. It provides excellent circuit reliability and low cost by eliminating external components and adjustments when used in systems with a 3.3V power supply.

This supervisory circuit helps to ensure that the digital system retains proper functionality by providing a multitude of protective features. One of its key features is the ability to assert a reset signal to the µP during power-up, power-down, and brownout conditions, ensuring that the µP starts up in a known state every time. The reset output remains asserted for a period of 140ms (min) after VCC has risen above the reset threshold level, allowing the power supply and µP to stabilize before operations commence.

The MAX6721UTVDD3+T operates over a wide temperature range of -40°C to +125°C, making it suitable for various industrial applications. Additionally, it has a low supply current of only 1.6µA, which is ideal for portable and battery-powered equipment where power conservation is critical.

Key features of the MAX6721UTVDD3+T include:

• Power-supply monitoring precision at 3.3V
• 140ms min power-on reset delay
• Manual reset capability
• Low quiescent current of 1.6µA
• Guaranteed reset valid to VCC = 1V
• No external components required
• Compact SOT23-6 packaging

This device is delivered in a space-saving SOT23-6 package and is part of the MAX6721 series designed for use in a variety of applications, including computers, controllers, intelligent instruments, and critical µP power monitoring.

With its precision monitoring and control of the system's power supply and the ability to manually reset the system, the MAX6721UTVDD3+T is an excellent choice for designers looking to enhance system reliability and performance in their digital applications. Maxim Integrated's commitment to quality ensures that this supervisory circuit meets the highest standards for both functionality and durability.