Product Overview: MAX809SEUR+R from Maxim Integrated

The MAX809SEUR+R, from the renowned manufacturer Maxim Integrated, is a compact, highly efficient microprocessor (µP) supervisory circuit designed to monitor power supplies in digital systems. It provides a significant level of system reliability and accuracy required in today's sophisticated electronic applications.

This device is engineered to assert a reset signal whenever the VCC supply voltage declines below a preset threshold, ensuring that the µP is reset properly during power-up, power-down, and brown-out conditions. The reset signal remains asserted for a minimum of 140ms after VCC has risen above the reset voltage threshold, providing ample time for the system to stabilize.

The MAX809SEUR+R comes in a small SOT-23 package, which is ideal for space-constrained applications. It operates over a wide supply voltage range from 1.2V to 5.5V, making it versatile for use in various low-power and portable devices. With its low supply current of only 20µA (typical), this supervisory circuit is particularly suitable for battery-operated equipment.

Key features of the MAX809SEUR+R include:

• Reset threshold voltage precision at ±1.5%, ensuring dependable monitoring.
• Immunity to short VCC transients, avoiding false resets.
• An active-low RESET output, which remains asserted for 140ms (min) after VCC rises above the reset threshold.
• Low power consumption with a typical supply current of 20µA, ideal for portable devices.
• Wide operating temperature range from -40°C to +85°C, suitable for various environments.

Applications for the MAX809SEUR+R are diverse and include portable/battery-powered equipment, computers, controllers, intelligent instruments, critical µP and µC power monitoring, and more. Its ease of integration, coupled with Maxim Integrated's reputation for quality, makes it a top choice for engineers looking to enhance system reliability and performance.

Whether you are designing consumer electronics, industrial control systems, or complex medical devices, the MAX809SEUR+R supervisory circuit provides a simple and effective solution for safeguarding your application against the perils of unpredictable power supply conditions.