Maxim Integrated MAX6326UR26-T Microprocessor Reset Circuit

The MAX6326UR26-T from Maxim Integrated is a high-precision, low-power 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 systems that require voltage monitoring. This particular model is part of the MAX6326 series, which are known for their compactness and efficiency.

Encased in a tiny SOT-23 package, the MAX6326UR26-T is specifically engineered to maintain system integrity by monitoring the power supply voltage. It asserts a reset signal whenever the VCC supply voltage falls below its preset threshold of 2.6V. The reset output remains asserted for a minimum timeout period after VCC has risen above the reset threshold, ensuring that the system has adequate time to stabilize before resuming operation. This timeout period is typically 140ms, which provides a safe margin for system recovery.

The device operates with a very low supply current, typically 1.2µA, making it ideal for power-critical applications. It is characterized for operation over a wide temperature range, from -40°C to +85°C, which makes it suitable for use in a variety of environments, from industrial to commercial.

Key features of the MAX6326UR26-T include:

• Preset Reset Threshold Voltage: 2.6V
• Minimum Reset Timeout Period: 140ms
• Low Supply Current: 1.2µA (typ)
• Supply Voltage Range: 1.2V to 5.5V
• Immune to Short VCC Transients
• No External Components Required
• Small SOT-23 Packaging

This device is designed for use in a variety of applications where reliable monitoring of the system power supply is critical. Common applications include portable/battery-powered equipment, computers, controllers, intelligent instruments, and critical µP power monitoring.

With its combination of features, the MAX6326UR26-T is an excellent choice for designers looking for a simple, efficient, and reliable solution to protect their digital systems against the consequences of power supply instabilities.