Maxim Integrated MAX704SESA-T Microprocessor Supervisory Circuit

The MAX704SESA-T is a compact, highly reliable microprocessor (µP) supervisory circuit designed by Maxim Integrated 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 systems with +5V powered µP. This supervisory circuit is particularly suitable for use in computers, controllers, intelligent instruments, and critical µP power monitoring applications.

This device is engineered to keep the µP in reset mode during power-up, power-down, and brown-out conditions. The MAX704SESA-T ensures that the µP's reset input starts in the active state as soon as power is applied. Moreover, the device maintains the µP in a reset state until the system power supply has stabilized. If power dips below a preset threshold, the reset signal is again asserted to prevent the µP from operating in an indeterminate state.

The MAX704SESA-T comes in a 4-pin SOP (Small Outline Package) and is characterized for operation over a full automotive temperature range of -40°C to +125°C. It offers several key features, including:

• A precise factory-set reset threshold voltage.
• A 200ms minimum power-on reset delay, which provides a stable reset signal for the µP during power-up.
• A low supply current of 20µA (typical), which is ideal for power-conscious systems.
• An active-low, push-pull reset output, which allows for a direct connection to the reset pin of the µP without requiring an external pull-up resistor.
• Immunity to short V_CC transients.

The MAX704SESA-T is part of Maxim Integrated's family of µP supervisory circuits, which are designed to improve the reliability of electronic systems. Its ease of integration, combined with its robust feature set, makes it a preferred choice for system designers looking to enhance system stability and reduce the risk of unpredictable system behavior due to power supply issues.

With its compact size and no need for external components, the MAX704SESA-T is a cost-effective solution for ensuring that digital systems operate reliably and consistently, even in the face of unstable power supplies or unexpected power interruptions.