Maxim Integrated MAX690RCSA+ Microprocessor Supervisory Circuit

The Maxim Integrated MAX690RCSA+ 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 conjunction with +5V-powered circuits.

This supervisory circuit ensures that the µP is fully reset during power-up, power-down, and brown-out conditions. The MAX690RCSA+ features a reset output that remains asserted for at least 140ms after VCC has risen above the reset threshold level, guaranteeing that the µP starts up in a known state every time.

The MAX690RCSA+ comes in a compact 8-pin SOIC package, making it suitable for space-constrained applications. It operates over a wide temperature range, from -40°C to +85°C, ensuring reliable performance in diverse operating environments.

Key features of the MAX690RCSA+ include:

• Power supply monitoring for +5V systems
• 140ms minimum power-on reset pulse width
• 1.3V threshold detector for power-fail warning, low-battery detection, or to monitor a power supply other than +5V
• Active-high and active-low reset outputs
• Guaranteed RESET output valid to VCC = 1V
• Debounced TTL/CMOS-compatible manual-reset input
• Voltage monitor for power-fail or low-battery warning

The device also features a power-fail comparator that can be used to provide early warning of impending power failure or to monitor an additional supply voltage. This makes it an essential component for systems that require a high level of data integrity and reliability.

With its built-in features, the MAX690RCSA+ reduces the complexity and component count in power monitoring circuits. It is an ideal choice for use in microprocessor systems, computers, controllers, intelligent instruments, and critical µP power monitoring applications.

Whether you are designing a new system or upgrading an existing platform, the Maxim Integrated MAX690RCSA+ offers a robust and cost-effective solution for your µP supervisory needs.