Analog Devices Inc./Maxim Integrated MAX6359RVUT+T

Overview

MAX6359RVUT+T from Maxim Integrated is a dual-voltage microprocessor supervisory circuit with active-low push-pull reset referenced to VCC1, factory-set VCC1 threshold of 2.63V and VCC2 threshold of 1.58V, watchdog timer (46.4s startup / 2.9s normal timeout), and guaranteed RESET validity down to VCC1 ≥ 1.0V or VCC2 ≥ 1.0V - used in multivoltage embedded systems requiring reliable power-on and fault-reset sequencing.

For engineers reviewing the MAX6359RVUT+T datasheet, MAX6359RVUT+T pinout, MAX6359RVUT+T application, or MAX6359RVUT+T equivalent, key selection criteria include dual-supply monitoring tolerance, watchdog timeout architecture, push-pull output drive capability at low VCC, and SOT23-6 lead-free packaging compliance for industrial temperature operation.

Technical Context

The MAX6359RVUT+T implements a dual-threshold comparator architecture monitoring independent VCC1 and VCC2 supplies, asserting reset if either drops below its specified trip point (2.63V/1.58V). Its internal watchdog timer operates in two distinct modes: a 46.4s startup timeout enables full system initialization, followed by a 2.9s normal timeout for runtime processor activity verification.

Reset assertion is guaranteed as long as either supply remains ≥1.0V, and the active-low push-pull RST output is referenced to VCC1 with VOL ≤ 0.3V at ISINK = 50µA over –40°C to +85°C. The MR input is debounced and TTL/CMOS-compatible, while WDI accepts standard logic-level transitions to clear the watchdog.

Key Specifications

Pinout & Package

MAX6359RVUT+T is housed in a RoHS-compliant, lead(Pb)-free 6-pin SOT23 package (package code U6-1, outline 21-0058) with 0.95mm pitch and exposed pad not connected internally.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6359RVUT+T, the leaded MAX6359RVUT-T offers identical functionality but violates modern RoHS requirements, while MAX6358RVUT+T sacrifices push-pull drive strength for open-drain flexibility - making MAX6359RVUT+T the optimal choice for new designs needing robust, low-VCC-compatible reset assertion without external components.

Availability

MAX6359RVUT+T is available at Aetrix Electronics and suitable for industrial PLC controllers, portable medical monitors, automotive body control modules, and industrial IoT edge gateways requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MAX6359RVUT+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 precision analog and mixed-signal ICs for industrial, communications, and computing applications, with emphasis on reliability, low power, and integration.

The MAX6351–MAX6360 family delivers dual- and triple-voltage supervision with integrated watchdog timers specifically for multirail embedded systems where deterministic power-up sequencing and runtime fault detection are mission-critical.

FAQ

What is the exact reset threshold voltage for VCC1 and VCC2 on the MAX6359RVUT+T?

The MAX6359RVUT+T has a factory-set VCC1 threshold of 2.63V (±0.05V over –40°C to +85°C) and a VCC2 threshold of 1.58V (±0.03V over temperature). These values are laser-trimmed during production and appear in the "RV" suffix designation per Maxim's Voltage Threshold Levels table - confirming precise dual-rail monitoring without external adjustment.

Does the MAX6359RVUT+T provide an open-drain or push-pull reset output?

The MAX6359RVUT+T provides an active-low push-pull reset output (RST pin) referenced to VCC1. This is confirmed in the Pin Description table (page 6) and Selector Guide (page 9), which explicitly assign "push-pull with respect to VCC1" to MAX6359. Unlike MAX6358RVUT+T, it requires no external pullup and can sink 50µA while maintaining VOL ≤ 0.3V down to VCC1 = 1.0V.

What are the watchdog timeout periods supported by the MAX6359RVUT+T?

The MAX6359RVUT+T supports two watchdog timeout periods: a 46.4s startup timeout (first period after any reset event) and a 2.9s normal timeout (active after startup completes or after first WDI transition). These values are specified in the Electrical Characteristics table (page 3) under "Watchdog Timeout Period" and enable reliable boot sequencing and runtime supervision.

Can the MAX6359RVUT+T operate with supply voltages below 2.0V?

Yes - the MAX6359RVUT+T guarantees full functionality with VCC1 or VCC2 as low as 1.2V over temperature, and RESET remains valid as long as either supply stays ≥1.0V. Its 1.58V VCC2 threshold and 20µA supply current make it suitable for sub-2V systems such as 1.6V core rails in portable devices, with VOL ≤ 0.3V maintained at ISINK = 50µA down to VCC1 = 1.0V.

Is the MAX6359RVUT+T RoHS-compliant and what does the "+T" suffix indicate?

Yes, the "+T" suffix in MAX6359RVUT+T explicitly denotes lead(Pb)-free, RoHS-compliant packaging per Maxim's ordering information (page 1). It replaces the leaded "-T" variant and uses the same SOT23-6 footprint (U6-1 outline), ensuring drop-in compatibility while meeting environmental compliance requirements for global electronics manufacturing.