Maxim Integrated MAX693AESE+T Microprocessor Supervisory Circuit

The MAX693AESE+T from Maxim Integrated is a highly reliable and efficient 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 in battery-powered applications. This supervisory circuit is particularly suited for use in computers, controllers, intelligent instruments, and portable battery-powered equipment.

This device offers several key features that make it ideal for critical system monitoring functions. It includes a reset output during power-up, power-down, and brownout conditions. The reset signal remains asserted until the VCC supply voltage reaches the reset threshold level and maintains it for approximately 200ms after VCC has risen above the reset threshold, ensuring a proper system reset during power-up.

The MAX693AESE+T also features a battery backup power switching function for CMOS RAM, CMOS microprocessor, or other low-power logic. A chip-enable gating function (CE IN and CE OUT) is provided to write-protect memory when VCC is below the reset threshold or when the optional watchdog timer has not been stroked within the selected time-out period.

The integrated watchdog timer is a significant feature of this supervisory circuit, requiring an edge or pulse on the watchdog input (WDI) within the selected time-out period (1.6s or 160ms). If the system fails to provide this signal within the specified time, the device asserts a system reset to prevent system hang-up or runaway.

Encased in a 16-pin Narrow SO package, the MAX693AESE+T operates over the extended industrial temperature range of -40°C to +85°C. It is available in tape and reel format, facilitating the ease of manufacturing and integration into automated production lines.

Overall, the Maxim Integrated MAX693AESE+T microprocessor supervisory circuit is a vital component that enhances system reliability by providing essential monitoring and control functions, ensuring stable operation even under adverse power conditions.