Maxim Integrated MAX6419EUK29 Microprocessor Reset Circuit

The MAX6419EUK29 is a compact, highly precise microprocessor (μP) supervisory circuit designed by Maxim Integrated to monitor power supplies in digital systems. It ensures that the microprocessor is reset to a known state during power-up, power-down, or brown-out conditions. The device is particularly suitable for portable and space-constrained applications due to its small SOT23 packaging.

This supervisory circuit offers several key features that make it an ideal choice for reliable system management. It provides a factory-trimmed reset threshold voltage of 2.925V, which ensures that systems operate within their specified voltage ranges. The reset output is valid down to VCC = 1.0V, which allows for low-voltage operation, a crucial aspect for battery-operated devices.

One of the notable characteristics of the MAX6419EUK29 is its low power consumption, with a typical supply current of only 1.0μA. This makes it an excellent choice for power-sensitive applications. Additionally, the device has an active-low, push-pull reset output, which eliminates the need for external pull-up resistors and reduces component count and system cost.

The reset timeout period of the MAX6419EUK29 is fixed at 140ms (min), providing a predictable delay from the moment a voltage fault is detected until the system is reset. This ensures that the system has sufficient time to return to a stable operating condition before resuming normal operation.

For enhanced system reliability, the MAX6419EUK29 features an immunity to short VCC transients, safeguarding the microprocessor from spurious resets, which is critical for maintaining robust system performance. The device's operating temperature range extends from -40°C to +85°C, allowing for use in environments with varying thermal conditions.

In summary, the Maxim Integrated MAX6419EUK29 is a highly reliable and precise μP supervisory circuit that offers low power consumption, small footprint, and robust protection features. It is an excellent choice for designers looking to enhance the stability and safety of their digital systems, particularly in portable and space-constrained applications.