Analog Devices Inc./Maxim Integrated MAX6359LTUT+T

Overview

The MAX6359LTUT+T from Maxim Integrated is a dual-voltage microprocessor supervisory circuit with active-low push-pull reset referenced to VCC1, 4.63V/3.08V factory-set thresholds, integrated watchdog timer (46.4s startup / 2.9s normal timeout), and guaranteed reset validity down to VCC1 ≥ 1.0V or VCC2 ≥ 1.0V. It monitors two independent supply rails in multivoltage embedded systems such as industrial controllers and portable instrumentation.

For engineers reviewing the MAX6359LTUT+T datasheet, MAX6359LTUT+T pinout, MAX6359LTUT+T application, or MAX6359LTUT+T equivalent, key selection criteria include dual-supply threshold accuracy (±1.5% over temperature), 20µA quiescent current, 100ms min reset pulse width, and watchdog timing architecture compatible with complex boot sequences.

Technical Context

The MAX6359LTUT+T implements a dual-threshold comparator architecture with independent trip points for VCC1 (4.63V) and VCC2 (3.08V), asserting reset if either supply falls below its respective threshold. Its watchdog timer features two distinct timeout modes: a 46.4s startup period after power-on or manual reset, followed by a 2.9s normal timeout requiring periodic WDI transitions.

Reset output is an active-low push-pull driver referenced to VCC1, guaranteed functional with VCC1 ≥ 1.0V or VCC2 ≥ 1.0V. The device operates across -40°C to +85°C, with 20ppm/°C reset threshold tempco and 100ms–280ms reset timeout period, ensuring robust operation under thermal stress and supply transients.

Key Specifications

Pinout & Package

MAX6359LTUT+T is housed in a 6-pin SOT23 package (U6-1 outline, 90-0175 land pattern), RoHS-compliant with lead(Pb)-free finish indicated by "+T" suffix.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-voltage supervisory applications.

Compared with MAX6359LTUT+T, the MAX6359LTUT-T offers identical performance but lacks RoHS compliance, while the TPS3808G33DBVR reduces cost and power at the expense of dual-supply capability and watchdog functionality-making it unsuitable for systems requiring coordinated reset across multiple rails or runtime processor health monitoring.

Availability

MAX6359LTUT+T is available at Aetrix Electronics and suitable for industrial controllers, portable medical instruments, automotive body control modules, and networked industrial sensors requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for MAX6359LTUT+T includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Maxim Integrated (now part of Analog Devices) designs high-performance analog and mixed-signal ICs for industrial, automotive, and communications applications, with emphasis on reliability and integration.

The MAX6351–MAX6360 family delivers multivoltage supervision with integrated watchdog timers for embedded systems requiring coordinated power-rail monitoring and processor health assurance.

FAQ

What is the exact reset threshold voltage for VCC1 and VCC2 on the MAX6359LTUT+T?

The MAX6359LTUT+T has factory-trimmed reset thresholds of 4.63V for VCC1 and 3.08V for VCC2, with ±1.5% tolerance over the full -40°C to +85°C temperature range. These values are confirmed in the Voltage-Threshold Levels table and Electrical Characteristics section of the official datasheet, and apply specifically to the "LT" suffix variant.

Does the MAX6359LTUT+T provide a watchdog timer, and what are its timeout periods?

Yes, the MAX6359LTUT+T includes a dual-mode watchdog timer with a 46.4s startup timeout period after power-on or manual reset, and a 2.9s normal timeout period during steady-state operation. These values are guaranteed and documented in the Electrical Characteristics table under "Watchdog Timeout Period".

What is the reset output configuration of the MAX6359LTUT+T, and how is it referenced?

The MAX6359LTUT+T features a single active-low push-pull reset output (RST) referenced to VCC1, as confirmed in the Pin Description and Selector Guide sections. This differs from MAX6351 (dual push-pull) and MAX6352 (open-drain), and ensures strong drive capability without external pull-up resistors.

Can the MAX6359LTUT+T operate with supply voltages below 2.0V?

Yes - the MAX6359LTUT+T guarantees valid reset output as long as either VCC1 ≥ 1.0V or VCC2 ≥ 1.0V, per Absolute Maximum Ratings and Electrical Characteristics. However, full specification (e.g., 4.63V/3.08V thresholds) applies only when VCC1 and VCC2 are within 1.2V to 5.5V.

What package type and RoHS status does the MAX6359LTUT+T use?

The MAX6359LTUT+T uses a 6-pin SOT23 package (U6-1 outline) with lead(Pb)-free RoHS-compliant construction, indicated by the "+T" suffix per Maxim's ordering nomenclature. Land pattern 90-0175 applies, and the device meets JEDEC J-STD-020 moisture sensitivity level MSL3.