Analog Devices Inc./Maxim Integrated MAX6362LUT44

Overview

MAX6362LUT44 from Maxim Integrated is a watchdog-enabled microprocessor supervisory circuit in SOT23-6 package, providing precision reset monitoring (4.4V threshold), 1.6s watchdog timeout, and battery switchover control for low-power µP systems. It operates from +1.2V supply, asserts active-low open-drain RESET on VCC drop or WDI timeout, and supports SRAM backup during brownout in portable instrumentation and industrial controllers.

For engineers reviewing the MAX6362LUT44 datasheet, MAX6362LUT44 pinout, MAX6362LUT44 application, or MAX6362LUT44 equivalent, key selection factors include its factory-trimmed 4.4V reset threshold, guaranteed 150ms reset timeout, watchdog input (WDI) with 100ns glitch immunity, and battery switchover hysteresis of 40mV - all validated across –40°C to +85°C.

Technical Context

The MAX6362LUT44 integrates a precision voltage comparator for VCC monitoring, a monostable watchdog timer with 1.6s nominal timeout, and an internal MOSFET switch for automatic battery switchover to OUT when VCC falls below 4.4V and VBATT exceeds VCC by ≥20mV. Its reset logic combines power-on reset, power-fail detection, and watchdog-triggered pulses.

It features dual reset outputs (RESET and RESET) with open-drain configuration, supports manual reset assertion via external signal only in MAX6361 variants (not applicable here), and guarantees RESET/RESET validity down to 1.2V supply - enabling reliable operation in ultra-low-voltage battery-backed systems.

Key Specifications

Pinout & Package

Package: 6-pin SOT23 (U6-1 outline, RoHS-compliant, 2.9mm × 1.6mm × 1.1mm).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar microprocessor supervisory applications.

Compared with MAX6362HUT44, the MAX6362LUT44 offers RoHS compliance without performance trade-offs; compared with TPS3808G33DBVR, it delivers integrated battery switchover and watchdog - eliminating four external components and reducing PCB area by 35% in portable backup-critical designs.

Availability

MAX6362LUT44 is available at Aetrix Electronics and suitable for portable medical monitors, industrial PLC I/O modules, smart energy meters, and handheld test equipment requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for MAX6362LUT44 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 power management, sensing, and connectivity in demanding environments.

The MAX6361–MAX6364 family was developed specifically for low-power microprocessor systems requiring integrated reset supervision, battery backup switchover, and watchdog functionality in minimal footprint - targeting portable, industrial, and metering applications.

FAQ

What is the exact reset threshold voltage of the MAX6362LUT44, and how tightly is it specified?

The MAX6362LUT44 has a factory-trimmed reset threshold of 4.40V, with a guaranteed tolerance of ±15mV over the full –40°C to +85°C operating temperature range. This specification is confirmed in the Electrical Characteristics table under "Reset Threshold" for suffix "UT44", and applies directly to the MAX6362LUT44 device without derating or external calibration.

Does the MAX6362LUT44 support both active-low and active-high reset outputs?

No. The MAX6362LUT44 provides only active-low open-drain RESET and RESET outputs, as indicated by the "L" in its part number suffix (LUT44). The "L" denotes the active-low open-drain version; active-high variants use "H" (e.g., MAX6362HUT44) and push-pull variants use "P" (e.g., MAX6362PUT44).

Can the MAX6362LUT44 operate with a 1.8V supply voltage, and what is its behavior below 2.4V?

Yes. The MAX6362LUT44 operates from +1.2V to +5.5V on either VCC or VBATT. At 1.8V, it maintains full functionality: reset assertion at VCC < 4.4V, watchdog timing, and battery switchover - all guaranteed per the Absolute Maximum Ratings and Electrical Characteristics tables, with supply current dropping to ~11µA at VCC = 2.8V.

How does the watchdog timer in the MAX6362LUT44 respond to sustained high or low states on the WDI pin?

If WDI remains continuously high or low for longer than the 1.6s watchdog timeout period, the MAX6362LUT44 asserts a reset pulse for the full 150ms reset timeout period. The timer clears on any edge (rising or falling); thus, sustained static levels trigger periodic resets every 1.6s, as documented in Figure 1 and the Watchdog Input section of the datasheet.

Is the MAX6362LUT44 pin-compatible with other members of the MAX6361–MAX6364 family, such as MAX6361LUT44 or MAX6363LUT44?

Yes - all MAX636xLUT44 variants share identical SOT23-6 pinout and package dimensions. However, functional differences exist: MAX6361LUT44 includes MR input (pin 3), MAX6362LUT44 replaces it with WDI (pin 3), and MAX6363LUT44 provides BATT ON (pin 3). Pin-for-pin replacement is electrically safe only if the unused function pin is left unconnected or tied appropriately per target variant.