Analog Devices Inc./Maxim Integrated MAX6359TZUT

Overview

MAX6359TZUT from Maxim Integrated is a dual-voltage microprocessor supervisory circuit with active-low push-pull reset referenced to VCC1, 3.08V/2.32V factory-set voltage thresholds, watchdog timer (46.4s startup / 2.9s normal timeout), and operation from -40°C to +85°C in a 6-pin SOT23 package - used in multivoltage embedded systems requiring reliable power-on reset and processor activity monitoring.

For engineers reviewing the MAX6359TZUT datasheet, MAX6359TZUT pinout, MAX6359TZUT application, or MAX6359TZUT equivalent, key selection criteria include dual-supply threshold accuracy, guaranteed RESET validity down to VCC1 = 1V or VCC2 = 1V, watchdog timing modes, manual-reset debouncing, and SOT23-6 footprint compatibility for space-constrained industrial controllers and portable equipment.

Technical Context

The MAX6359TZUT implements a dual-threshold comparator architecture monitoring VCC1 and VCC2 independently; reset assertion occurs if either supply drops below its respective trip point (3.08V for VCC1, 2.32V for VCC2). Its watchdog timer features two distinct timeout modes: a 46.4s startup period after power-up or reset, followed by a 2.9s normal timeout triggered by missing WDI transitions.

It delivers an active-low push-pull RST output referenced to VCC1, supports debounced TTL/CMOS manual reset (MR), guarantees functional reset output as long as either VCC1 ≥ 1.0V or VCC2 ≥ 1.0V, and draws only 20µA typical supply current across the full temperature range.

Key Specifications

Pinout & Package

MAX6359TZUT is housed in a 6-pin SOT23 package (package code U6-1), with 0.95mm pitch, 2.9mm × 1.6mm body size, and exposed pad not present. Pin 1 is RST (active-low push-pull, referenced to VCC1), Pin 2 is GND, Pin 3 is MR (debounced manual reset input), Pin 4 is VCC2 (secondary supply input), Pin 5 is WDI (watchdog input), and Pin 6 is VCC1 (primary supply input).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6359TUT, the MAX6359TZUT offers identical supervision performance with lead-free compliance; versus TPS3808G33DBVR, it adds essential dual-voltage monitoring, 2.32V secondary threshold, and dual-mode watchdog - making it indispensable for multirail, safety-critical embedded systems where coordinated reset and runtime processor vigilance are mandatory.

Availability

MAX6359TZUT is available at Aetrix Electronics and suitable for industrial PLC controllers, portable medical monitors, automotive infotainment head units, and network edge routers requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.

Supply support for MAX6359TZUT 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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power-management ICs for industrial, communications, and computing applications.

The MAX6351–MAX6360 family was designed specifically for multivoltage microprocessor systems needing precision dual-supply monitoring, guaranteed reset validity at low VCC, and integrated watchdog supervision - targeting space-constrained, reliability-critical embedded platforms.

FAQ

What is the exact voltage threshold configuration of the MAX6359TZUT?

The MAX6359TZUT has factory-set voltage thresholds of 3.08V for VCC1 and 2.32V for VCC2, as indicated by the "TZ" suffix per the Voltage Threshold Levels table. These values are trimmed at production and specified over temperature (-40°C to +85°C) with ±0.08V and ±0.07V tolerances respectively. The MAX6359TZUT does not support adjustable thresholds - it is a fixed-threshold supervisory device optimized for 3.3V/2.5V or 3.0V/2.3V dual-rail systems.

Does the MAX6359TZUT provide a watchdog timer, and what are its timeout periods?

Yes, the MAX6359TZUT includes a dual-mode watchdog timer. It features a 46.4s startup timeout period (min 25.6s, max 72.0s) that begins after power-up or any reset event, followed by a 2.9s normal timeout period (min 1.6s, max 4.5s) that activates after the first valid WDI transition or upon completion of the startup period. This architecture prevents false watchdog resets during system initialization while ensuring rapid fault detection during normal operation.

What is the reset output type and drive capability of the MAX6359TZUT?

The MAX6359TZUT provides a single active-low push-pull reset output (RST) referenced to VCC1. It can sink up to 1.2mA at VCC1 ≥ 2.7V (VOL ≤ 0.3V) and up to 3.2mA at VCC1 ≥ 4.5V (VOL ≤ 0.4V). Unlike open-drain variants, this push-pull output requires no external pull-up resistor, simplifying PCB layout and reducing component count in space-constrained designs.

How does the MAX6359TZUT ensure reset validity during deep brownout conditions?

The MAX6359TZUT guarantees functional reset output as long as either VCC1 ≥ 1.0V or VCC2 ≥ 1.0V - a key reliability feature documented in its absolute maximum ratings and electrical characteristics. This means the RST output remains asserted or deasserted in a known, valid logic state even when both supplies sag significantly, enabling safe system recovery from severe undervoltage events without undefined reset behavior.

Is the MAX6359TZUT compatible with standard SOT23-6 footprints and reflow profiles?

Yes, the MAX6359TZUT uses the industry-standard 6-pin SOT23 package (outline 21-0058, land pattern 90-0175) with 0.95mm pin pitch and 2.9mm × 1.6mm body dimensions. It is rated for lead-free reflow processing and complies with JEDEC J-STD-020 moisture sensitivity level (MSL) 1. No special layout or thermal considerations beyond standard SOT23-6 guidelines are required for successful assembly.