MAX6359SYUT+T

Overview

The MAX6359SYUT+T is a dual-input voltage supervisory circuit from the MAX6359L series, manufactured by Analog Devices Inc./Maxim Integrated. It monitors two independent power supply rails using preset thresholds of 3.08 V and 4.63 V. The device features an active-low push-pull reset output referenced to VCC1, ensuring system stability when voltages drop below specified levels. It includes a manual reset input and a watchdog timer with a 2.9 s timeout period. Operating over an extended temperature range of -40°C to +85°C, it draws only 20 µA of supply current. The component is housed in a compact SOT-23-6 surface-mount package, suitable for space-constrained portable applications.

Feature Summary

• Monitors two distinct power-supply voltages with precision factory-set thresholds
• Provides an active-low push-pull reset output referenced to VCC1
• Integrates a watchdog timer with a defined startup timeout period
• Includes a debounced manual reset input compatible with TTL/CMOS logic

Applications

• Portable electronic devices requiring multi-rail power supervision
• Battery-operated systems needing low quiescent current monitoring
• Microprocessor (µP) systems demanding reliable voltage reset signals

Procurement Notes

Verify the specific suffix 'SY' against official Analog Devices documentation to confirm exact threshold configurations, as variations exist within the MAX6359 family. Confirm RoHS compliance status and lead times directly with authorized distributors or the manufacturer, as availability may be restricted. Ensure the SOT-23-6 package type matches your PCB footprint requirements before ordering.

Selection Notes

Select this component when simultaneous monitoring of two voltage rails is required with high accuracy. The 20 µA supply current makes it suitable for battery-powered designs where power efficiency is critical. The integrated watchdog timer simplifies software reliability without additional external components. Compare threshold values against your specific power rail specifications to ensure proper reset activation timing.

Part Context

This part belongs to the MAX6351–MAX6360 microprocessor supervisory circuit family, designed to improve system reliability by monitoring multiple power supplies. These devices assert reset outputs if any monitored supply falls outside its preset threshold. The series offers various threshold options and package types, including 5-pin and 6-pin SOT-23 variants, operating across extended industrial temperature ranges.

Replacement Considerations

The MAX6358LTUT+T is a related dual-input supervisor but features open-drain outputs instead of push-pull. Verify output drive requirements before substitution. Other family members like MAX6359MSUT+T offer different threshold combinations. Always cross-reference datasheet electrical characteristics and pinouts to ensure functional compatibility.