The MAX818LCUA-T from Maxim Integrated is a compact, highly-integrated microprocessor (µP) supervisory circuit designed to monitor power supplies in µP and digital systems. It provides excellent circuit reliability and low cost by eliminating external components and adjustments when used in monitoring 3.3V, 3V, and other voltage-powered circuits.

This supervisory circuit ensures that the µP is reset to a known state during power-up, power-down, or brown-out conditions. The MAX818LCUA-T features an active-low RESET output, which remains asserted for a minimum of 140ms after VCC has risen above the reset threshold level, ensuring a proper system reset. The reset threshold voltage for the MAX818LCUA-T is precision-trimmed, which enables it to monitor 3.3V power supplies with high accuracy.

The device is packaged in an 8-pin µMAX package, making it suitable for space-constrained applications. It operates over a wide temperature range of -40°C to +85°C, ensuring reliable performance in various environments. The MAX818LCUA-T also features a low supply current of only 17µA, making it ideal for portable and battery-powered equipment.

Key features of the MAX818LCUA-T include:

• Precision Supply-Voltage Monitoring of 3.3V, 3V, and Other Voltages
• 140ms (min) Reset Pulse Width
• Active-Low RESET Output
• Low Supply Current of 17µA
• Guaranteed RESET Valid to VCC = 1V
• Power-Supply Transient Immunity
• No External Components Required
• Compact 8-Pin µMAX Package
• Temperature Range: -40°C to +85°C

Applications for the MAX818LCUA-T include:

• Computers and Controllers
• Battery-Powered Equipment
• Intelligent Instruments
• Embedded Systems
• Portable Consumer Electronics

The MAX818LCUA-T is a testament to Maxim Integrated's commitment to providing solutions that enhance system integrity. Its ease of integration, combined with its monitoring precision, makes it an excellent choice for designers looking to enhance the reliability and performance of their digital systems.