Maxim Integrated MAX809MEUR-T Microprocessor Reset Circuit

The MAX809MEUR-T from Maxim Integrated is a compact, highly efficient microprocessor (µP) supervisory circuit designed to monitor power supplies in digital systems. It provides a crucial function by ensuring that the µP and its peripherals are reset properly during power-up, power-down, and brown-out conditions. The device is housed in a small 3-pin SOT-23 package, making it ideal for space-constrained applications.

This supervisory circuit is tailored to maintain system integrity by monitoring the VCC supply voltage. It asserts a reset signal whenever the VCC supply voltage drops below a preset threshold. The reset signal remains asserted for a minimum of 140ms after VCC has risen above the reset threshold level, ensuring the system has adequate time to stabilize before resuming operation. This feature is particularly beneficial for preventing system errors and data corruption during transient conditions.

The MAX809MEUR-T operates over a wide supply voltage range from 1.2V to 5.5V, which makes it suitable for use in a variety of digital systems, including portable/battery-powered equipment, computers, embedded systems, and other microprocessor-based applications. The low supply current of 17µA (typical) is a significant advantage for battery-operated devices, contributing to extended battery life and improved energy efficiency.

Key features of the MAX809MEUR-T include:

• Precision monitoring of 3V, 3.3V, and 5V supply voltages.
• Low power consumption with a typical supply current of 17µA.
• Guaranteed reset valid to VCC = 1.0V.
• Reset pulse width of 140ms (min).
• Immunity to short VCC transients.
• Compact 3-pin SOT-23 package suitable for space-constrained applications.

The MAX809MEUR-T is a reliable choice for system designers looking to enhance the operational stability and reliability of their digital systems. Its ease of integration, low power consumption, and small footprint make it an essential component in the design of robust and energy-efficient electronic products.

For further technical details, datasheets, and support, customers are encouraged to visit Maxim Integrated's official website or contact their local sales representative.