Maxim Integrated MAX803LEXR Microprocessor Reset Circuit

The MAX803LEXR from Maxim Integrated is a compact, highly reliable microprocessor (µP) supervisory circuit designed to monitor power supplies in digital systems. It provides a crucial function by ensuring that the µP and its peripherals are reset properly during power-up, power-down, and brown-out conditions. This device is an essential component for maintaining system integrity and preventing software execution errors.

Featuring a low supply current of only 17µA (typical) and an operating voltage range from 1.2V to 5.5V, the MAX803LEXR is versatile and energy-efficient, making it suitable for battery-operated applications. Its precision factory-trimmed threshold voltage ensures accurate monitoring of the power supply, and with a threshold tolerance of ±2.5%, it provides a reliable reset output without external components.

The MAX803LEXR comes in a compact 3-pin SOT-23 package, which is ideal for space-constrained applications. It has an active-low, open-drain RESET output, which remains asserted for a minimum of 140ms after VCC has risen above the reset threshold level. This ensures that the system has sufficient time to stabilize before the processor starts operating.

Key features of the MAX803LEXR include:

• Low power consumption: 17µA typical supply current
• Wide operating voltage range: 1.2V to 5.5V
• Precision monitoring of 3V, 3.3V, and 5V power-supply voltages
• ±2.5% reset threshold accuracy over temperature
• 140ms minimum power-on reset pulse width
• Low cost and small size
• Guaranteed RESET output to VCC = 1.0V
• Temperature range: -40°C to +85°C
• No external components needed

The device is targeted for use in a variety of applications including computers, controllers, intelligent instruments, portable/battery-powered equipment, and embedded systems. With its robust design and reliable performance, the MAX803LEXR is an excellent choice for designers looking to enhance system reliability and prevent data corruption during adverse power conditions.

Maxim Integrated's commitment to quality ensures that the MAX803LEXR meets the stringent requirements for industrial and consumer electronic products, providing peace of mind for engineers and product developers.