MAX6359TZUT

Overview

The MAX6359TZUT+T is a dual-voltage microprocessor supervisory circuit manufactured by Analog Devices Inc. (Maxim Integrated). It monitors two input supply voltages with factory-set thresholds of 3.08 V and 4.63 V, featuring corresponding overvoltage thresholds at 3.14 V and 4.72 V. The device provides an active-low push-pull reset output referenced to the primary supply rail. Key electrical parameters include a maximum operating voltage of 5.5 V, a quiescent supply current of 20 µA, and a reset delay time of 180 ms. It incorporates a manual reset input and a watchdog timer function. The component operates within an extended temperature range of -40°C to +85°C and is housed in a compact SOT-23-6 surface-mount package.

Feature Summary

• Dual-channel voltage monitoring with precise factory-set thresholds for multiple power rails
• Integrated watchdog timer with defined startup and normal timeout periods
• Debounced manual reset input compatible with TTL and CMOS logic levels
• Active-low push-pull reset output ensuring valid states as long as inputs exceed minimum operational voltage

Applications

• Multi-rail embedded system power supervision
• Industrial control unit voltage monitoring
• Communication equipment power integrity management

Procurement Notes

Verify the complete ordering part number, typically ending in suffixes such as +T or +TTR, to ensure correct packaging and RoHS compliance. Confirm that the specific threshold voltages match the design requirements, as the MAX6359 series offers various fixed combinations. Check availability status, as distribution channels may indicate limited stock or restricted sales regions for this specific variant. Ensure the SOT-23-6 footprint aligns with the PCB layout specifications.

Selection Notes

Select this component when simultaneous monitoring of two distinct voltage rails is required within a single package. The integrated watchdog timer simplifies firmware reliability compared to discrete solutions. Consider the 20 µA supply current for battery-operated applications where low quiescent power consumption is critical. Verify that the 180 ms reset delay meets the system's power-up sequencing requirements. The SOT-23-6 package is suitable for space-constrained designs requiring surface-mount technology.

Part Context

The MAX6359 belongs to the Maxim Integrated MAX6351–MAX6360 family of microprocessor supervisory circuits. This series was designed to replace discrete components by providing multiple reset outputs in a compact form factor. The MAX6359 specifically targets applications needing dual-voltage supervision with a watchdog feature, distinguishing it from variants like the MAX6355 which lacks a watchdog but monitors three voltages. The family shares common features such as low supply current and debounced manual reset inputs.

Replacement Considerations

Direct substitutes within the same family include other MAX6359 variants with different voltage thresholds, such as MAX6359LSUT+T or MAX6359SVUT+T, provided the pinout and package remain identical. Cross-family replacements require careful evaluation of threshold voltages, output drive capability, and watchdog functionality to ensure system compatibility.