Analog Devices Inc./Maxim Integrated MAX6364LUT31+T

Overview

MAX6364LUT31+T from Maxim Integrated is a low-power microprocessor supervisory circuit with auxiliary user-adjustable reset input (RESET IN), battery switchover, and active-low push-pull reset output. It operates from +1.2V supply, features factory-preset 3.08V reset threshold (V_TH), 150ms minimum reset timeout, and supports SRAM backup in brownout conditions. Used in portable/battery-powered equipment requiring reliable power-fail detection and controlled system reset.

For engineers reviewing the MAX6364LUT31+T datasheet, MAX6364LUT31+T pinout, MAX6364LUT31+T application, or MAX6364LUT31+T equivalent, key selection criteria include its 3.08V precision reset threshold, 1.235V adjustable RESET IN comparator reference, SOT23-6 package footprint, battery switchover hysteresis (40mV), and guaranteed reset assertion down to 1.2V V_CC/V_BATT.

Technical Context

The MAX6364LUT31+T implements a dual-supply monitoring architecture with independent V_CC and V_BATT inputs, enabling seamless switchover to backup power when V_CC falls below V_TH (3.08V) and V_CC < V_BATT − 20mV. Its internal 1.235V bandgap reference feeds the RESET IN comparator, allowing external resistor-divider programming of secondary supply thresholds.

Reset assertion logic combines three independent triggers: V_CC falling below V_TH, RESET IN falling below 1.235V, or manual/WDI events (though WDI and MR are not implemented in MAX6364). The active-low push-pull RESET output drives loads directly without external pull-up, with VOL ≤ 0.4V at 3.2mA sink current and guaranteed operation down to 1.2V supply.

Key Specifications

Pinout & Package

Package: 6-pin SOT23 (U6-1, outline 21-0058), RoHS-compliant lead-free (+T suffix), -40°C to +85°C operating range.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6364LUT31+T, the MAX6364HUT31+T offers identical threshold and supervision logic but requires external pull-up for RESET, increasing component count; the TPS3808G30DBVR provides longer reset timeout and wider supply range but omits battery backup and adjustable input-making it unsuitable for SRAM retention or dual-supply monitoring.

Availability

MAX6364LUT31+T is available at Aetrix Electronics and suitable for portable medical devices, industrial data loggers, point-of-sale terminals, and smart utility meters requiring stable component supply across long product lifecycles.

Supply support for MAX6364LUT31+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, mixed-signal, and power management ICs for demanding industrial, automotive, and computing applications.

The MAX6361–MAX6364 family targets ultra-low-power microprocessor supervision in battery-critical systems, emphasizing precision reset thresholds, seamless battery switchover, and flexible reset input options for multi-rail monitoring.

FAQ

What is the exact reset threshold voltage of the MAX6364LUT31+T?

The MAX6364LUT31+T has a factory-preset reset threshold voltage (V_TH) of 3.08V, with ±1.5% accuracy over the full -40°C to +85°C temperature range. This value is laser-trimmed during production and specified in the Electrical Characteristics table under "Reset Threshold" for the "MAX636_UT31" suffix. It is designed to reliably monitor 3.0V and 3.3V power rails without external components.

How does the RESET IN pin function on the MAX6364LUT31+T?

The RESET IN pin on the MAX6364LUT31+T compares an external voltage to an internal 1.235V precision bandgap reference. When the voltage at RESET IN falls below 1.235V, the device asserts the RESET output. This allows programmable monitoring of secondary supplies (e.g., 5V analog rails) using a simple resistor divider. Input leakage is ±25nA max, enabling high-impedance divider networks that minimize current draw from backup sources.

Does the MAX6364LUT31+T support battery backup switchover, and what are the conditions?

Yes, the MAX6364LUT31+T supports automatic battery backup switchover. It connects the V_BATT input to the OUT pin when two conditions are met: (1) V_CC falls below the 3.08V reset threshold, and (2) V_CC is at least 20mV lower than V_BATT. This 40mV hysteresis prevents oscillation during slow voltage decay. The device draws only 0.05µA from V_BATT in standby, preserving battery life.

What type of reset output does the MAX6364LUT31+T provide, and how is it different from other variants?

The MAX6364LUT31+T provides an active-low push-pull RESET output, meaning it actively drives the output low during reset and high when released-no external pull-up resistor is required. This differs from the MAX6364HUT31+T (active-low open-drain) and MAX6364PUT31+T (active-high open-drain), which both require external pull-up components. The push-pull structure simplifies PCB layout and improves noise immunity on the reset line.

Can the MAX6364LUT31+T operate from a 1.2V supply, and what functions remain active?

Yes, the MAX6364LUT31+T operates from a minimum supply voltage of +1.2V on either V_CC or V_BATT. At 1.2V, the device maintains full reset assertion capability: RESET output remains valid (V_OL ≤ 0.4V at 3.2mA), V_TH monitoring is guaranteed, and battery switchover logic functions correctly. This enables reliable operation in deep-brownout scenarios where other supervisors fail, preserving SRAM data until backup power takes over.