Maxim Integrated MAX708SEUA Microprocessor Supervisory Circuit

The MAX708SEUA from Maxim Integrated is a compact, highly efficient 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 system monitoring applications.

This supervisory circuit ensures that the µP is reset to a known state during power-up, power-down, or brown-out conditions. The MAX708SEUA has an active-low reset signal that remains asserted for a minimum of 140ms after VCC has risen above the reset voltage threshold. This feature ensures that the system has sufficient time to stabilize before the processor starts operating.

The device operates with a supply voltage range of 1.2V to 5.5V, making it suitable for use in a wide array of applications, including computers, controllers, intelligent instruments, portable/battery-powered equipment, and critical µP power monitoring. Its low supply current of 8µA (typical) is particularly advantageous for portable and battery-powered applications where power efficiency is crucial.

Key features of the MAX708SEUA include:

• Precision factory-set VCC reset thresholds
• 140ms minimum power-on reset pulse width
• Low 8µA supply current
• Guaranteed reset valid to VCC = 1.2V
• Power supply transient immunity
• No external components required
• Compact 8-pin µMAX package

The device is packaged in an 8-pin µMAX package that offers space-saving advantages for high-density circuit boards. The MAX708SEUA supervisory circuit is fully guaranteed over the temperature range of -40°C to +85°C, ensuring reliable operation under a broad range of environmental conditions.

Overall, the Maxim Integrated MAX708SEUA is an essential component for system designers seeking to enhance the reliability and performance of microprocessor-based systems. Its integration into a system helps prevent firmware corruption, ensures stable operation, and provides a robust defense against unpredictable power supply variations.