ON Semiconductor MAX810LTR Microprocessor Reset Circuit

The ON Semiconductor MAX810LTR is a compact, highly efficient microprocessor (µP) supervisory circuit designed to monitor power supplies in digital systems. It provides a crucial function in ensuring system reliability by generating a reset signal whenever the V_CC supply voltage drops below a preset threshold. This reset signal maintains the processor in a reset state until the supply voltage stabilizes, thereby preventing any erratic operation during power-up, power-down, or brown-out conditions.

This device comes in a three-pin SOT-23 package, making it ideal for space-constrained applications. It is designed to assert a reset signal when the V_CC supply voltage declines below the factory-programmed threshold. The reset output remains asserted for a period of at least 140ms after V_CC has risen above the reset threshold level, ensuring a proper system reset. The reset output is available in two options: active-low (MAX810) and active-high (MAX811).

The MAX810LTR operates with a supply voltage range of 1.0V to 5.5V, which covers most logic levels and supply standards, making it versatile for various applications. It has a low supply current of 17µA (typical), which is beneficial for battery-powered equipment. The device's quiescent current is also low, ensuring minimal power consumption when the system is in standby mode.

Key features of the MAX810LTR include:

• Precision monitoring of 3V, 3.3V, and 5V power-supply voltages
• Fully specified over temperature
• Available in standard SOT-23 package
• Low power consumption
• Guaranteed RESET valid to V_CC = 1.0V
• 140ms min power-on reset pulse width

The MAX810LTR is particularly suitable for portable devices, computers, controllers, and intelligent instruments where power monitoring is critical for data integrity and system stability. Its ease of integration and robustness make it an essential component for designers looking to enhance the reliability of their digital systems.