MAX6335US23D3+T

Overview

The MAX6335US23D3+T is a microprocessor supervisory circuit manufactured by Analog Devices Inc./Maxim Integrated. It monitors power supplies in 1.8V to 3.3V systems, asserting a reset signal when VCC declines below a preset threshold or upon manual reset assertion. The device features an active-high push-pull RESET output and remains in the correct state for VCC down to 0.7V. It operates within a supply voltage range of 1.8V to 5.5V, with a typical supply current of 3.3µA. The reset threshold is factory-trimmed to 2.3V, with an overvoltage threshold of 2.34V. The component supports a manual reset input and provides a reset timeout period after VCC rises above the threshold. It is housed in a 4-pin SOT-143 package and operates between -40°C and +125°C.

Feature Summary

• Provides precise monitoring of low-voltage power supplies with a debounced manual-reset input
• Features an active-high push-pull reset output that asserts when supply voltage drops below the threshold
• Maintains correct reset state for supply voltages as low as 0.7V
• Designed to ignore fast transients on the supply voltage

Applications

• Microprocessor (µP) system power supply monitoring
• Digital system voltage supervision
• Battery-powered devices requiring low quiescent current
• Portable electronics with space-critical designs

Procurement Notes

Verify the specific suffix D3 indicates the 2.3V threshold variant. Confirm RoHS compliance status (+T suffix). Check availability as this part may have limited stock or be subject to restricted supply conditions from distributors. Ensure the active-high output requirement matches your system design, as other variants in the series offer active-low outputs.

Selection Notes

Select this component when an active-high reset signal is required for 1.8V to 3.3V systems. The 2.3V threshold suits applications where the supply rail must remain stable above this level. Consider the 3.3µA supply current for battery life optimization. The SOT-143 package is suitable for compact PCB layouts. Verify compatibility with the system's manual reset logic requirements.

Part Context

The MAX6335 belongs to the MAX6335/MAX6336/MAX6337 family of ultra-low-voltage, low-power µP reset circuits. While all three share similar monitoring capabilities and packaging, they differ in output polarity and type. The MAX6335 specifically offers an active-high push-pull output, distinguishing it from the active-low open-drain MAX6337 and active-low push-pull MAX6336. This family eliminates external components and adjustments for cost reduction.

Replacement Considerations

Direct functional substitutes include MAX6335US22D3+T (2.2V threshold) and MAX6335US19D3+T (1.9V threshold) if different thresholds are acceptable. For active-low outputs, consider MAX6336US23D3+T or MAX6337US23D3+T. Ensure pinout compatibility with the SOT-143-4 package.