Analog Devices Inc./Maxim Integrated MAX6361LUT44-T

Overview

MAX6361LUT44-T from Maxim Integrated is a low-power microprocessor supervisory circuit with factory-preset 4.4V reset threshold, active-low push-pull reset output, and manual reset input (MR). It operates from +1.2V supply, provides 150ms minimum reset timeout, guarantees RESET validity down to 1.2V, and supports battery switchover for SRAM backup in brownout conditions. Used in portable/battery-powered equipment requiring reliable power-up sequencing and system-level fault recovery.

For engineers reviewing the MAX6361LUT44-T datasheet, MAX6361LUT44-T pinout, MAX6361LUT44-T application, or MAX6361LUT44-T equivalent, key selection criteria include reset threshold accuracy (±1.5% over temperature), MR debounced input with internal 20kΩ pull-up, guaranteed 150ms reset timeout, SOT23-6 package compatibility, and support for dual-supply monitoring with VCC/VBATT switchover logic.

Technical Context

The MAX6361LUT44-T implements a precision voltage monitor with internal bandgap reference and comparator driving a push-pull reset output stage. Its MR input features built-in debounce and TTL/CMOS-compatible thresholds (VIL = 0.3VCC, VIH = 0.7VCC), eliminating external RC networks. The device uses BiCMOS process technology to achieve ultra-low quiescent current (10µA typical at VCC = 2.8V) while maintaining robust transient immunity.

Reset assertion occurs when VCC falls below 4.4V (typical) or MR is pulled low; reset remains active for ≥150ms after VCC rises above threshold or MR transitions high. The push-pull output drives RESET directly without external pull-up, supporting logic-level compatibility with µP reset inputs across 1.2V–5.5V operating range.

Key Specifications

Pinout & Package

MAX6361LUT44-T is housed in a 6-pin SOT23 package (U6-1 outline, 21-0058), measuring 2.9mm × 1.6mm × 1.1mm, with lead-free RoHS-compliant finish (indicated by "-T" suffix).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6361PUT44-T, MAX6361LUT44-T reduces component count via push-pull output and simplifies layout; versus TPS3808G33DBVR, it adds critical battery switchover and MR functionality essential for portable and fail-safe systems, at the cost of higher quiescent current and narrower voltage threshold options.

Availability

MAX6361LUT44-T is available at Aetrix Electronics and suitable for portable medical devices, industrial PLC modules, POS terminals, and smart energy meters requiring stable component supply and long-term lifecycle support.

Supply support for MAX6361LUT44-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 power management, sensing, and connectivity in industrial, automotive, and computing applications.

The MAX6361–MAX6364 family targets microprocessor-based systems needing integrated power supervision, battery backup control, and manual reset - optimized for space-constrained, low-power, and high-reliability embedded platforms.

FAQ

What is the exact reset threshold voltage of MAX6361LUT44-T and how tightly is it specified?

The MAX6361LUT44-T has a factory-trimmed reset threshold of 4.4V (typical), with guaranteed limits of 4.25V (min) and 4.50V (max) over the full -40°C to +85°C temperature range. This ±1.5% tolerance ensures accurate detection of +5V supply droop without false triggering, and is confirmed in the Electrical Characteristics table of the official datasheet under "Reset Threshold" parameter.

Does MAX6361LUT44-T support battery backup switchover, and what are the voltage conditions required?

Yes, MAX6361LUT44-T supports automatic battery switchover. It connects OUT to BATT when VCC falls below the reset threshold (4.4V) AND VCC is at least 20mV lower than VBATT. A 40mV hysteresis prevents oscillation during slow VCC decay. The device requires VCC to be present at startup - it will not power up from BATT alone, as stated in the Detailed Description section.

What type of reset output does MAX6361LUT44-T provide, and how does it interface with a microprocessor reset pin?

MAX6361LUT44-T provides an active-low push-pull RESET output. This means it actively drives the output low during reset and high when inactive - no external pull-up resistor is needed. It interfaces directly with standard µP reset inputs rated for 1.2V–5.5V logic levels and can sink up to 20mA, ensuring robust noise immunity and fast edge rates without additional components.

Can the manual reset input (MR) of MAX6361LUT44-T be left floating, and what is its default state?

No, the MR pin of MAX6361LUT44-T must not be left floating. It features an internal 20kΩ pull-up resistor to VCC, so the default state is logic-high (inactive). To assert reset, MR must be pulled low - typically via a momentary switch to GND. Leaving it unconnected risks noise-induced false resets; if unused, connect MR to VCC per the Applications Information section.

What is the minimum supply voltage required for MAX6361LUT44-T to guarantee proper reset functionality?

MAX6361LUT44-T guarantees full reset functionality - including valid RESET output states and accurate threshold monitoring - down to +1.2V on either VCC or VBATT. This is explicitly stated in the Features list ("RESET/RESET Valid Down to 1.2V Guaranteed") and verified in the Absolute Maximum Ratings and Electrical Characteristics tables, enabling use with single-cell Li+ and emerging ultra-low-voltage logic families.