Maxim Integrated's MAX691AEWE+T Microprocessor Supervisory Circuit

The MAX691AEWE+T from Maxim Integrated is a 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 conjunction with +5V-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 MAX691AEWE+T features a combination of functions such as power-on reset control, watchdog timer, battery backup switching, and write protection, making it an all-in-one solution for system stability.

The device comes in a 16-pin SOIC (Wide) package, which is suitable for surface-mount technology (SMT), allowing for efficient use of PCB space. The MAX691AEWE+T operates over the extended temperature range of -40°C to +85°C, ensuring reliable performance in a wide range of environments and applications.

Key features of the MAX691AEWE+T include:

• Power-Fail Input: It monitors the power-fail input and triggers a reset to prevent improper operation during low voltage conditions.
• Watchdog Timer: The built-in watchdog timer ensures that the µP does not hang in an erroneous state for extended periods by forcing a system reset if the µP does not refresh the watchdog periodically.
• Battery Backup: In the event of a power failure, the device automatically switches to a backup battery to maintain essential system parameters.
• Memory Write Protection: During adverse power conditions, the memory write protection feature prevents corruption of the memory contents.
• Low Power Consumption: The circuit is designed for low power consumption, which is critical for battery-operated systems.

Applications for the MAX691AEWE+T include microprocessor systems, computers, controllers, intelligent instruments, and critical µP power monitoring. Its robust feature set and compact form factor make it an ideal choice for designers looking to enhance system integrity and reduce the risk of data loss or corruption during power failures or other supply anomalies.

Maxim Integrated's commitment to quality and innovation is reflected in this product, ensuring that the MAX691AEWE+T supervisory circuit is a reliable and cost-effective choice for managing µP system power supplies.