MAX6359LSUT+T

Overview

The MAX6359LSUT+T is a dual-input voltage supervisory circuit manufactured by Analog Devices Inc. under the Maxim Integrated brand. It monitors two independent power supply rails using preset threshold voltages of 3.08 V and 4.63 V, with corresponding overvoltage thresholds at 3.14 V and 4.72 V. The device features an active-low push-pull reset output referenced to VCC1 and includes a manual reset input. It incorporates a watchdog timer with a 46.4-second startup timeout and a 2.9-second regular timeout period. The reset delay time is specified at 180 ms, and the quiescent supply current is 20 µA. Operating within a maximum supply voltage of 5.5 V, it maintains accuracy within 1.5% across an extended temperature range from -40°C to +85°C.

Feature Summary

• Dual-input voltage supervision with factory-set precision thresholds for monitoring multiple power rails simultaneously
• Integrated watchdog timer functionality providing extended startup timeout and regular timeout periods for system reliability
• Active-low push-pull reset output referenced to VCC1 ensuring robust signal integrity in digital systems

Applications

• Microprocessor (µP) supervisor circuits requiring multi-voltage monitoring
• Battery-powered portable devices needing low standby current consumption
• Industrial control systems operating in extended temperature environments

Procurement Notes

Verify the specific suffix 'L' indicates the precise voltage threshold configuration of 3.08 V and 4.63 V, as this variant differs from other MAX6359 subtypes. Confirm the package type is SOT-23-6 and ensure RoHS compliance documentation is available for regulatory requirements. Cross-reference the manufacturer part number with distributor databases to confirm current availability status, as some variants may have limited stock or be subject to allocation constraints.

Selection Notes

Select this component when dual-rail monitoring is required with specific thresholds near standard 3.3 V and 5 V logic levels. The 20 µA supply current makes it suitable for battery-operated applications where power conservation is critical. Ensure the application requires the specific 180 ms reset delay and does not need chip enable functionality. Verify that the active-low push-pull output drives are compatible with the downstream microprocessor reset inputs.

Part Context

The MAX6359 belongs to the MAX6351–MAX6360 family of microprocessor supervisors designed to improve system reliability compared to discrete components. This series offers multiple reset voltages and operates over the extended temperature range. Unlike single-channel monitors, this dual-input variant simplifies board space by integrating two supervision channels into a compact SOT-23-6 package, reducing component count and assembly complexity.

Replacement Considerations

The MAX6356LSUT+T is a triple-input alternative within the same family but monitors three voltages instead of two. The MAX6358LSUT+T is another dual/triple option in the series. Verify that the threshold voltages and pinout compatibility match the existing design before substituting.