The MAX805TEPA is a highly reliable, precision microprocessor (µP) supervisory circuit from Maxim Integrated, designed to monitor power supplies in digital systems. It provides excellent circuit reliability and low cost by eliminating external components and adjustments when used in systems with a +5V power supply voltage.

This supervisory circuit ensures that the µP is only operational when the power supply is within acceptable limits. It achieves this by asserting a reset signal to the µP until the supply voltage reaches a stable and acceptable level during power-up and operation. The reset signal remains active for a minimum of 140ms after the supply has reached the specified threshold, ensuring a proper system reset. This feature is crucial for preventing system errors and malfunctions that can occur if the µP attempts to operate with an unstable or inadequate power supply.

The MAX805TEPA also includes a manual reset feature, allowing designers to initiate a system reset remotely. This can be particularly useful during system maintenance or in the case of software anomalies. The device also provides a watchdog timer that must be periodically cleared by the µP. If the µP fails to clear the watchdog timer within a preset timeout period, the MAX805TEPA will assert a reset signal, providing an additional layer of system protection.

Key features of the MAX805TEPA include:

• Precision monitoring of +5V power supplies
• 140ms (min) reset pulse width
• Manual reset input
• Watchdog timer with 1.6s (typ) timeout
• Active-low RESET output
• Temperature range: 0°C to +70°C
• 8-pin DIP (Dual In-line Package) or SO (Small Outline) package options

This device is commonly used in computers, controllers, intelligent instruments, critical µP and µC power monitoring, and portable/battery-powered equipment. The MAX805TEPA is an essential component for ensuring the stability and reliability of systems that cannot tolerate any disruption or failure due to power supply issues.

With its robust feature set and Maxim Integrated's reputation for quality, the MAX805TEPA is an excellent choice for designers looking to enhance system integrity and prevent data loss or corruption in their digital systems.