Maxim Integrated MAX818LCSA+T Microprocessor Supervisory Circuits

The MAX818LCSA+T by Maxim Integrated is a compact, highly efficient microprocessor (µP) supervisory circuit designed to monitor power supplies in µP and digital systems. It provides a significant level of protection to ensure that the system operates reliably by resetting the µP during power-up, power-down, and brownout conditions. With its small size and high level of integration, the MAX818LCSA+T is an excellent choice for use in a wide range of applications, including portable devices, computers, controllers, and intelligent instruments.

This supervisory circuit ensures that the µP is reset to a known state during power failures. It achieves this by monitoring the VCC supply voltage and issuing a reset signal whenever VCC falls below the factory-set reset threshold. The reset output remains asserted for a minimum reset timeout period after VCC has risen above the reset threshold, ensuring that the µP has adequate time to stabilize.

The MAX818LCSA+T comes in a space-saving 8-pin SOIC package, making it ideal for systems where board space is at a premium. Its low supply current of only 17µA (typical) makes it suitable for battery-operated applications where power conservation is crucial. The device operates over a wide voltage range, from 1.2V to 5.5V, providing versatility in different system designs.

Key features of the MAX818LCSA+T include:

• Reset threshold voltages tailored for 5V, 3.3V, and 3V systems
• 150ms (min) reset timeout period
• Low supply current of 17µA (typ)
• Guaranteed reset valid to VCC = 1V
• Wide operating temperature range from -40°C to +85°C
• Immune to short VCC transients

With its robust feature set, the MAX818LCSA+T provides a reliable solution for system monitoring and is an essential component for enhancing the operational stability of your digital systems. Its ease of integration and support for various supply voltages make it a versatile choice for designers looking to improve the safety and reliability of their microprocessor-based systems.