Maxim Integrated MAX705CSA-T Microprocessor Supervisory Circuit

The Maxim Integrated MAX705CSA-T 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 in system monitoring applications. This component is particularly well-suited for use in computers, controllers, intelligent instruments, and critical µP power monitoring.

The MAX705CSA-T supervises the power supply voltages to ensure that the system's microprocessor and associated circuitry always operate over the correct voltage range. It provides a reset output during power-up, power-down, and brown-out conditions. The reset signal remains operational with VCC as low as 1.2V, ensuring that the µP resets properly during power failures. The reset output is guaranteed to be in the correct state for VCC down to 1V.

This supervisory circuit features a 4.65V threshold voltage for detecting over-voltage conditions and a 200ms reset timeout period, which ensures the system microprocessor starts up in a known state every time. Additionally, it includes a manual reset input that allows the user to initiate a reset with an external pushbutton or logic signal. The MAX705CSA-T comes in a space-saving 8-pin SOIC package and operates over the extended temperature range of -40°C to +85°C, making it suitable for a wide range of environments and applications.

The MAX705CSA-T also offers a watchdog timer functionality that forces the system into a reset state if the microprocessor fails to strobe within a preset timeout period. This feature is critical for systems that require high reliability and fault tolerance.

Overall, the Maxim Integrated MAX705CSA-T microprocessor supervisory circuit is a versatile and essential component for any system requiring robust power supply and microprocessor monitoring to ensure stable and reliable operation.