Maxim Integrated MAX691ACPE Microprocessor Supervisory Circuit

The MAX691ACPE is a highly integrated microprocessor supervisory circuit designed by Maxim Integrated, a renowned leader in the development of analog and mixed-signal products. This supervisory circuit is engineered to provide maximum reliability for microprocessor (µP) systems, ensuring that the system operates correctly during power-up, power-down, and brown-out conditions.

With its robust feature set, the MAX691ACPE supervises the power supplies in µP and digital systems, providing four key functions to safeguard system integrity: a reset output during power-up, power-down, and brown-out conditions; a 1.25V threshold detector for power-fail warning, low-battery detection, or to monitor a power supply other than +5V; a watchdog timer to ensure that the µP hangs in a runaway condition; and a write protection for CMOS RAM, EEPROM, or other memory.

The MAX691ACPE comes in a 16-pin DIP (Dual In-line Package) or optional SO (Small Outline) package, making it versatile for various PCB (Printed Circuit Board) layouts. Its operating temperature range is 0°C to +70°C, which is suitable for commercial applications.

Key features of the MAX691ACPE include:

• Reset Output: 200ms min power-on reset pulse width ensures that the µP starts in a known state.
• Watchdog Timer: A 1.6s timeout that helps to recover from a µP failure.
• Battery Backup Switching: For CMOS RAM, CMOS µP, or other low-power logic.
• Power-Fail Input: Monitors for under-voltage conditions to trigger system reset.
• Guaranteed RESET Assertion: With VCC down to 1V, which is critical for low-power operations.

The MAX691ACPE is ideal for use in systems that require a high degree of reliability and fault tolerance, such as computers, controllers, intelligent instruments, and critical µP-powered applications. Its integration of multiple supervisory functions into a single chip helps reduce complexity and increase the reliability of the entire system, while also saving space and cost.

Maxim Integrated's commitment to quality ensures that the MAX691ACPE supervisory circuit meets the stringent requirements of modern electronic systems, providing designers with a dependable solution for µP system management.