Maxim Integrated MAX6314US28D4 Microprocessor Reset Circuit

The Maxim Integrated MAX6314US28D4 is a highly reliable, low-power microprocessor (µP) supervisory circuit designed to monitor power supplies in µP and digital systems. It provides a significant level of system stability by performing a reset operation during power-up, power-down, and brown-out conditions. The MAX6314US28D4 ensures that the µP starts operating in a known state.

This compact device is tailored to maintain system integrity by asserting a reset signal if the VCC supply voltage drops below a preset threshold. The reset signal remains asserted for a period of time after VCC has risen above the reset voltage threshold, allowing the power supply and processor to stabilize before the system can continue operation. This timeout period is internally set to a minimum of 140ms, which provides a reliable reset output without the need for any external components.

Another key feature of the MAX6314US28D4 is its ability to operate with very low supply currents, typically 1.5µA, which is essential for battery-powered equipment. This low power consumption extends battery life and reduces the overall power requirement for the system. The device is specified for operation from -40°C to +85°C, making it suitable for a wide range of applications, including portable devices, computers, controllers, and intelligent instruments.

The MAX6314US28D4 comes in a compact, 4-pin SOT-143 package, which is ideal for space-constrained applications. The fixed reset threshold voltage for this variant is 2.8V, which aligns with common logic levels and power supply standards in digital systems. The device features an active-low RESET output, which is compatible with most µP and logic interfaces.

With its combination of features, the Maxim Integrated MAX6314US28D4 is an excellent choice for designers looking for a simple, effective way to enhance system reliability and prevent the unpredictable operation of µP systems due to power disturbances.