MAX6334UR17D3

Overview

The MAX6334UR17D3 is a 3-pin, ultra-low-voltage, low-power microprocessor supervisory circuit manufactured by Analog Devices Inc./Maxim Integrated. It monitors power supplies in 1.8V to 3.3V systems to increase reliability and reduce cost by eliminating external components. The device asserts an active-low reset signal whenever the VCC supply voltage declines below a preset threshold of 1.7V (indicated by suffix D3). It maintains this state for a preset timeout period after VCC rises above the threshold. The output is open-drain, and the circuit is guaranteed to be in the correct state for VCC down to 1.0V.

Feature Summary

• Provides precise monitoring of 1.8V and 2.5V power-supply voltages with factory-trimmable thresholds.
• Features ultra-low operating supply voltage capability down to 0.7V for extended battery life.
• Designed with a reset comparator that ignores fast transients on VCC to prevent false resets.
• Delivers an active-low, open-drain reset output suitable for direct interfacing with digital logic.

Applications

• Microprocessor (μP) supervisory circuits
• Digital system power monitoring
• Battery-operated devices requiring low quiescent current

Procurement Notes

Verify the specific threshold voltage associated with the 'D3' suffix against the official datasheet before procurement, as suffixes denote different reset thresholds within the MAX6334 family. Confirm availability status directly with authorized distributors or the manufacturer, as lead times and stock levels fluctuate. Ensure the open-drain output configuration aligns with your system's pull-up requirements.

Selection Notes

Select the MAX6334UR17D3 when an active-low, open-drain reset output is required for 1.8V to 3.3V systems. Choose this part over push-pull variants if the application necessitates wired-OR connections or compatibility with open-drain inputs. Verify that the 1.7V threshold matches the critical brown-out detection point of the monitored processor.

Part Context

The MAX6334 belongs to the MAX6332/MAX6333/MAX6334 family of 3-pin uPower reset circuits. While the MAX6332 offers active-high push-pull output and the MAX6333 offers active-low push-pull output, the MAX6334 specifically provides an active-low open-drain output. All three share similar low-power characteristics and transient immunity features.

FAQ

What is the difference between the MAX6333 and MAX6334?

The primary difference is the output stage. The MAX6333 has an active-low push-pull output, while the MAX6334 has an active-low open-drain output. Both monitor the same voltage ranges and offer similar low-power performance.

Does the MAX6334 have a manual reset input?

No, the standard MAX6334 does not include a manual reset input. It automatically asserts the reset signal based solely on the monitored supply voltage crossing the threshold.