MAX6389LT31D3+T

Overview

The MAX6389LT31D3+T is a dual microprocessor supervisory circuit from the MAX6381–MAX6390 family, designed for low-voltage and low-power applications. It monitors two power-supply inputs within a range of +1.8V to +5.0V while consuming only 3µA of supply current at +1.8V. The device features a factory-set reset threshold voltage of 3.08V with an accuracy of 2.5%. It provides an active-low, open-drain reset output that asserts when VCC falls below the threshold and remains asserted for a minimum timeout period of 280ms after VCC rises above the threshold. The component operates over an extended temperature range from -40°C to +125°C and is housed in a compact SC-70-4 package.

Feature Summary

• Dual-channel monitoring capability for independent power-supply supervision
• Ultra-low quiescent current consumption suitable for battery-operated systems
• Active-low open-drain reset output ensures compatibility with various logic families
• Extended industrial temperature rating for reliable operation in harsh environments

Applications

• Portable electronic devices requiring efficient power management
• Embedded systems needing dual voltage rail supervision
• Industrial control units operating under variable thermal conditions
• Communication equipment utilizing low-voltage logic interfaces

Procurement Notes

Verify the exact suffix D3+T against the manufacturer's official datasheet to confirm the specific package variant and tape-and-reel configuration. Ensure the lead-free status aligns with RoHS compliance requirements for your assembly process. Cross-reference the threshold voltage code to guarantee the 3.08V specification matches your design needs before finalizing procurement orders.

Selection Notes

Select this component when dual voltage monitoring is required in a minimal footprint. The open-drain output allows for wired-OR configurations or level shifting. Consider the 280ms delay for system startup stability. Verify that the 3.08V threshold adequately covers the brown-out protection requirements for the monitored rails without causing nuisance resets during normal operation fluctuations.

Part Context

This part belongs to the MAX6389 series of single and dual low-voltage, low-power µP reset circuits. The series offers various threshold voltages and timeout delays to accommodate different system architectures. The LT suffix typically denotes the specific threshold voltage setting, while D3 indicates the SC-70-4 package type. This family is widely used in consumer electronics and industrial applications where space and power efficiency are critical constraints.

Replacement Considerations

Check for MAX6389XS31D3+T if adjustable thresholds are needed instead of fixed settings. Verify pinout compatibility with existing PCB layouts when substituting. Confirm that the replacement maintains the same active-low open-drain output characteristic and 280ms timeout delay to ensure system behavior remains unchanged.