Maxim Integrated MAX6315US31D4-T Microprocessor Reset Circuit

The MAX6315US31D4-T is a compact, highly reliable microprocessor (µP) supervisory circuit designed to monitor power supplies in µP and digital systems. Manufactured by Maxim Integrated, this device provides excellent circuit reliability and low cost by eliminating external components and adjustments when used in system designs.

This supervisory circuit ensures that the µP is held in reset until the system voltage has stabilized after power-up and continuously monitors the power supply voltage for undervoltage conditions. When the supply voltage drops below the factory-set reset threshold level, the reset signal is asserted, which remains active until the supply voltage returns above the reset threshold level, plus a small hysteresis to prevent noise from triggering a reset.

The MAX6315US31D4-T features an active-low, push-pull reset output. The reset output remains low for the reset timeout period after the supply voltage exceeds the reset threshold level. This timeout period ensures that the µP has sufficient time to stabilize and that the system is fully operational before the reset signal is de-asserted. The device has a preset reset threshold voltage of 3.08V, suitable for 3.3V-powered systems, and the reset timeout period is typically 140ms.

Designed in a compact SOT-143 package, the MAX6315US31D4-T is ideal for space-constrained applications. It operates over a wide temperature range of -40°C to +85°C, catering to a broad spectrum of industrial and consumer applications. The device is also characterized by its low supply current of 1µA (typical), making it an energy-efficient choice for portable and battery-operated equipment.

With its precision voltage monitoring capability and robust design, the MAX6315US31D4-T is an excellent choice for reliable system reset functions in microprocessor systems, computers, controllers, and intelligent instruments. Its ease of integration into a variety of circuit designs makes it a versatile component for ensuring system stability and integrity.