Maxim Integrated MAX809TEUR+TR Microprocessor Reset Circuit

The MAX809TEUR+TR from Maxim Integrated is a compact, three-pin microprocessor (µP) supervisory circuit that provides a highly reliable method for monitoring power supply functionality in digital systems. This device is designed to assert a reset signal whenever the VCC supply voltage declines below a preset threshold, ensuring that the µP and other critical system components initialize in a known state after a power failure or during power-up.

Featuring a precision voltage sensor, the MAX809TEUR+TR is tailored for systems that require an accurate and reliable reset function. The reset output remains asserted for a minimum timeout period after VCC has risen above the reset threshold level, providing a guaranteed reset duration even with a very fast power-on sequence. This timeout ensures that the system has sufficient time to stabilize before the processor begins operation.

The device comes in a small SOT-23 package, making it an ideal choice for space-constrained applications. Its low power consumption and wide operating voltage range from 1.2V to 5.5V make it suitable for portable and low-power electronics. The MAX809TEUR+TR is also characterized for operation over a broad temperature range, ensuring reliable performance in diverse operating conditions.

Key features of the MAX809TEUR+TR include:

• Compact SOT-23 packaging for space-saving design
• Precision monitoring of 3V, 3.3V, and 5V power supplies
• Low supply current of 17µA (typical) for power-efficient operation
• Immunity to short VCC transients to prevent false resets
• Wide operating temperature range of -40°C to +125°C
• Active-low RESET output

This reset circuit is ideal for a range of applications, including computers, controllers, intelligent instruments, portable/battery-operated equipment, and embedded systems. The MAX809TEUR+TR ensures that such systems operate reliably and start up correctly under variable conditions and power instabilities, making it an essential component for maintaining system integrity.

Overall, the MAX809TEUR+TR from Maxim Integrated is a highly reliable solution for system reset management, providing designers with a straightforward, robust, and efficient way to enhance system stability and performance.