MAX6333UR18D3-T

Overview

The MAX6333UR18D3-T is a 3-pin, ultra-low-voltage, low-power microprocessor supervisory circuit manufactured by Analog Devices Inc./Maxim Integrated. It monitors the VCC supply voltage in 1.8V to 3.3V systems and asserts an active-low, push-pull RESET signal when the voltage declines below a preset threshold of 1.8V. The device maintains this reset state for a timeout period after VCC rises above the threshold. Key electrical parameters include a maximum supply voltage of 5.5V, a typical operating supply current of 3.3µA, and an overvoltage threshold of 2.44V. It operates within a temperature range of -40°C to +125°C and is housed in an SOT-23-3 package.

Feature Summary

• Monitors power supply voltage and asserts a reset signal when the input drops below a factory-trimmed threshold.
• Features an active-low, push-pull output driver for direct interface with digital logic.
• Designed with a reset comparator that ignores fast transients on the supply voltage.

Applications

• Monitoring power supplies in 1.8V microprocessor systems
• Supervising voltage levels in digital systems
• Ensuring system reliability by eliminating external components

Procurement Notes

Verify the specific suffix D3 against official documentation to confirm the exact threshold voltage, as variations exist within the series. Confirm RoHS compliance status through the manufacturer's certification documents. Check for obsolescence or limited availability notices from authorized distributors, as lifecycle status may vary by region.

Selection Notes

Select this component for applications requiring a simple, single-input voltage supervision with an active-low push-pull output. Ensure the 1.8V threshold aligns with the target system's minimum operating voltage. Consider the SOT-23-3 package size for space-constrained designs. Verify that the 3.3µA quiescent current meets the system's power budget requirements.

Part Context

The MAX6333 belongs to the MAX6332/MAX6333/MAX6334 family of 3-pin, ultra-low-voltage, low-power µP reset circuits. These devices are designed to monitor power supplies in 1.8V to 3.3V microprocessor and digital systems. The primary distinction among the family members is the output type: MAX6333 provides an active-low push-pull output, while MAX6332 offers active-high push-pull and MAX6334 provides active-low open-drain outputs.

Replacement Considerations

MAX6333UR18D2+T (Active-Low Push-Pull, 1.8V Threshold)

FAQ

Does the MAX6333UR18D3-T have a manual reset input?

No, the MAX6333 does not feature a manual reset input; it relies solely on voltage monitoring for reset assertion.

What is the output configuration of the MAX6333?

The MAX6333 features an active-low, push-pull RESET output.