Maxim Integrated MAX809JTR+T Microprocessor Reset Circuit

The MAX809JTR+T is a highly reliable microprocessor (µP) supervisory circuit designed by Maxim Integrated to monitor power supplies in digital systems. It provides an essential function by asserting a reset signal to the µP during power-up, power-down, and brown-out conditions, ensuring that the µP starts up in a known state every time.

This compact device comes in a SOT-23 package, which is ideal for space-constrained applications. The MAX809JTR+T has become a popular choice among designers for its simplicity and effectiveness in enhancing system reliability.

Key Features of the MAX809JTR+T:

• Precision Monitoring: It features a preset threshold voltage (V_TH) of 4.63V, which makes it suitable for monitoring 5V power supplies.
• Low Power Consumption: The device is designed to consume minimal power, making it suitable for use in power-sensitive applications.
• Reset Signal: Upon detecting an out-of-tolerance power supply condition, the MAX809JTR+T asserts a reset signal, which remains asserted for a minimum of 140ms after the supply voltage rises above the reset threshold. This ensures proper system reset.
• Versatility: The reset output is available in both active-high and active-low configurations, providing design flexibility.
• Temperature Range: The device operates over a wide temperature range of -40°C to +85°C, making it suitable for various environmental conditions.
• Manual Reset: A manual reset input is provided, which allows for a reset to be triggered with an external switch or logic signal.

Applications:

The MAX809JTR+T is ideal for use in a variety of applications where reliable system operation is critical. It is commonly used in:

• Computers and Controllers
• Embedded Systems
• Portable/Battery-Powered Equipment
• Industrial Systems
• Networking Equipment

With its combination of features, the MAX809JTR+T from Maxim Integrated is an excellent choice for designers looking to enhance the reliability and performance of their digital systems.