Maxim Integrated MAX817LCPA Microprocessor Supervisory Circuit

The MAX817LCPA from Maxim Integrated is a 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 battery-powered systems. This supervisory circuit ensures that the µP is reset to a known state during power-up, power-down, or brown-out conditions.

The MAX817LCPA features a combination of functions that make it a versatile component for managing system integrity. It includes a precision voltage monitor with a 4.65V threshold, a manual reset feature, and a 200ms reset timeout period. These features contribute to the stable operation of microprocessor systems by preventing code execution errors during power-up, power-down, or voltage dips.

The device comes in an 8-pin DIP package, which is widely used in the industry and suitable for through-hole mounting techniques. Its operating temperature range of 0°C to +70°C allows it to perform reliably in most standard applications. The MAX817LCPA is designed to be directly interfaced with microprocessors, and it can be used in systems with multiple supply voltages by providing a reset signal to the µP during power-up, power-down, or in the event of a brown-out.

Key features of the MAX817LCPA include:

• 4.65V precision voltage monitor
• Manual reset input
• 200ms reset timeout
• Active-low RESET output
• Low supply current of 15µA (typical)
• Guaranteed RESET valid to VCC = 1V
• No external components needed

Its applications are broad, ranging from computers and controllers to critical microprocessor and microcontroller power monitoring. The MAX817LCPA is ideal for portable and battery-powered equipment, such as laptops, PDAs, and handheld instruments, where power conservation is crucial.

Maxim Integrated's commitment to quality and reliability is evident in the MAX817LCPA supervisory circuit, making it a trusted choice for designers looking to maintain system stability and protect against data corruption due to power irregularities.