Maxim Integrated MAX706TESA Microprocessor Supervisory Circuit

The MAX706TESA from Maxim Integrated is a compact, highly efficient 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 with 5V-powered circuits.

This supervisory circuit significantly enhances system robustness by providing several key protection features. It ensures that the µP is reset to a known state during power-up, power-down, and brownout conditions. The MAX706TESA includes a precision voltage sensor that monitors the power supply voltage and ensures that the connected µP resets when the supply voltage drops below a preset threshold, known as the reset threshold voltage.

Additionally, the MAX706TESA has an active-low reset output with a significant sink current capability, which remains asserted for a minimum of 140ms after VCC has risen above the reset threshold level. This delay ensures that the system has sufficient time to stabilize before the processor starts executing code. The device also features a manual reset input that allows a pushbutton to be connected for manual system resets.

The MAX706TESA is available in a compact 8-pin SOIC package, making it suitable for space-constrained applications. It operates over a wide temperature range of -40°C to +85°C, ensuring reliable operation in harsh environments.

Key features of the MAX706TESA include:

• Precision monitoring of 5V power-supply voltages.
• Fully integrated watchdog timer to ensure system reliability.
• Active-low reset output with 140ms minimum reset pulse width.
• Manual reset capability for direct user intervention.
• Low supply current of 17µA, ideal for battery-operated equipment.
• Thermal shutdown protection to prevent overheating.
• Immunity to short VCC transients.

Designed for use in computers, controllers, intelligent instruments, and critical µP power monitoring, the MAX706TESA is an essential component for maintaining the integrity of electronic systems. It is a testament to Maxim Integrated's commitment to providing innovative, high-quality products that ensure system stability and extend the life of electronic components.