Maxim Integrated MAX708RCSA+ Microprocessor Supervisory Circuit

The Maxim Integrated MAX708RCSA+ is a compact, highly reliable 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 conjunction with +5V-powered circuits.

This supervisory circuit significantly enhances system robustness by providing several key features. It includes a reset output during power-up, power-down, and brownout conditions. The reset signal remains asserted for a minimum of 140ms after VCC has risen above the reset threshold level, ensuring that the µP starts up in a known state. The MAX708RCSA+ has a factory-trimmed reset threshold of 4.65V, which is suitable for operation with standard 5V power supplies.

Additionally, the MAX708RCSA+ offers a manual reset feature. By asserting a low signal to the manual reset input, the reset can be triggered externally, allowing for system reboots without the need to cycle the power. This is particularly useful for remote troubleshooting and resetting systems that may have become unresponsive.

The device is packaged in an 8-pin SOIC package, making it easy to integrate into a variety of designs without taking up significant board space. The MAX708RCSA+ operates over a wide temperature range of -40°C to +85°C, making it suitable for use in environments that experience extreme temperature variations.

Key features of the MAX708RCSA+ include:

• Reset threshold voltage precision of ±1.5%
• Minimum 140ms reset pulse width
• Debounced manual reset input
• Watchdog timer with a 1.6s timeout (MAX708)
• Low 12µA supply current
• Wide operating temperature range

Whether it's for computers, controllers, intelligent instruments, critical µP power monitoring, or portable equipment, the Maxim Integrated MAX708RCSA+ provides a simple and efficient solution for system stability and protection.