Maxim Integrated MAX919ESA+T Microprocessor Supervisory Circuit

The MAX919ESA+T from Maxim Integrated is a highly reliable microprocessor (µP) supervisory circuit designed to monitor power supplies and microprocessor activity in digital systems. It provides excellent circuit reliability and low cost by eliminating external components and adjustments when used with 5V-powered circuits.

This supervisory circuit is particularly suitable for use in portable computers, controllers, intelligent instruments, and critical µP power monitoring. It ensures that the µP is reset to a known state during power-up, power-down, or brown-out conditions. The MAX919ESA+T operates over a wide voltage range and offers a variety of threshold voltages, making it versatile for various applications.

The device comes in a small 8-pin SOIC package, which is ideal for space-constrained applications. It features a reset comparator designed to ignore fast transients on VCC, and its reset output is guaranteed to remain in the logic low state with VCC as low as 1V. The MAX919ESA+T also includes a debounced manual reset input, allowing the user to trigger a reset with an external pushbutton or logic signal.

Key features of the MAX919ESA+T include:

• Low supply current of 15µA (typical), which is crucial for battery-powered devices.
• Reset timeout period of 140ms (min), providing adequate time for the µP to initialize.
• Factory-trimmed reset threshold voltages for 5V systems, eliminating the need for external adjustments.
• Immunity to short VCC transients, ensuring reliable operation under noisy conditions.
• Capability to assert reset with VCC down to 1V, ensuring proper system reset during low power conditions.
• No external components are required, simplifying design and reducing overall system cost.

With its precision voltage monitoring and robust feature set, the MAX919ESA+T is an excellent choice for engineers looking to enhance system reliability and perform critical monitoring functions with minimal additional complexity. Whether you're designing a new system or upgrading an existing one, the MAX919ESA+T offers a compact, cost-effective solution for your supervisory circuit needs.