Analog Devices Inc./Maxim Integrated MAX6364HUT29-T

Overview

MAX6364HUT29-T from Maxim Integrated is a low-power microprocessor supervisory circuit with auxiliary user-adjustable reset input (RESET IN), battery switchover, and active-high open-drain reset output. It operates from +1.2V supply, features factory-preset 2.93V reset threshold, 150ms minimum reset timeout, and supports backup-battery operation for SRAM retention in brownout conditions.

For engineers reviewing the MAX6364HUT29-T datasheet, MAX6364HUT29-T pinout, MAX6364HUT29-T application, or MAX6364HUT29-T equivalent, key selection criteria include its 2.93V VTH accuracy over -40°C to +85°C, RESET IN comparator referenced to 1.235V, SOT23-6 package compatibility, and support for secondary power-supply monitoring via external resistor divider.

Technical Context

The MAX6364HUT29-T implements a precision voltage-monitoring architecture with dual-path power routing: OUT connects to VCC when above VTH (2.93V), and switches to BATT when VCC falls below VTH and VBATT exceeds VCC by ≥20mV. Its RESET IN input compares externally applied voltage against an internal 1.235V reference, enabling programmable undervoltage detection for secondary rails.

Reset assertion is triggered by VCC falling below 2.93V, RESET IN falling below 1.235V, or manual intervention via MR (debounced internally). The active-high open-drain RESET output remains asserted for ≥150ms after recovery, ensuring reliable µP initialization during power-up, brownout, and backup transitions.

Key Specifications

Pinout & Package

Package: 6-pin SOT23 (U6-1 outline, RoHS-compliant, tape-and-reel).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6364HUT29-T, MAX6364HUT31-T offers higher reset threshold for improved noise margin on 3.3V rails, while TPS3808G33DBVR provides longer reset timeout but omits critical battery management and auxiliary monitoring features required for SRAM retention and multi-rail supervision.

Availability

MAX6364HUT29-T is available at Aetrix Electronics and suitable for industrial controllers, portable medical devices, SRAM battery backup systems, and embedded network routers requiring stable component supply across extended temperature ranges.

Supply support for MAX6364HUT29-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, sensing, and interface applications in industrial, automotive, and communications markets.

The MAX6361–MAX6364 product line delivers integrated power-supply monitoring, battery switchover, and reset generation for microprocessor-based systems where reliability, low quiescent current, and compact packaging are critical.

FAQ

What is the exact reset threshold voltage of MAX6364HUT29-T and how is it specified?

The MAX6364HUT29-T has a factory-trimmed reset threshold voltage of 2.93V, with guaranteed tolerance of ±1.5% over the full -40°C to +85°C operating temperature range. This value is confirmed in the Electrical Characteristics table under "MAX636_UT29" suffix row, where MIN/TYP/MAX values are 2.85V/2.93V/3.00V. The threshold is internally set and not adjustable; it applies specifically to VCC monitoring, not the auxiliary RESET IN pin.

Does MAX6364HUT29-T support battery backup functionality, and what are the switchover conditions?

Yes, MAX6364HUT29-T supports automatic battery backup. Switchover occurs when two conditions are met simultaneously: VCC falls below the 2.93V reset threshold, and VBATT exceeds VCC by at least 20mV. An internal MOSFET connects BATT to OUT with typical on-resistance of 2.75Ω at VBATT = 4.5V. The 40mV hysteresis (VBATT – VCC) prevents chattering during slow VCC decay. MAX6364HUT29-T does not provide a BATT ON indicator signal - that function is exclusive to MAX6363 variants.

How is the auxiliary RESET IN pin used on MAX6364HUT29-T, and what voltage triggers reset?

The RESET IN pin on MAX6364HUT29-T compares an external voltage against an internal 1.235V reference. Reset is asserted when the voltage at RESET IN falls below 1.235V (with ±5mV tolerance over temperature). To monitor a secondary supply (e.g., 5.0V rail), use a resistor divider: R1 = R2 × (VRTH / 1.235V – 1). For a 4.60V trip point and R2 = 100kΩ, R1 = 273kΩ. Input leakage is ≤±25nA, enabling high-impedance divider networks without accuracy loss.

What is the reset output configuration of MAX6364HUT29-T, and how should it be interfaced?

MAX6364HUT29-T features an active-high open-drain RESET output (pin 1). During reset, it pulls high; otherwise, it presents high impedance. An external pull-down resistor (typically 10kΩ to GND) is required to ensure logic-low default state. This configuration allows wired-OR connection with other reset sources and direct interfacing with µP reset inputs requiring active-high assertion. The output sinks up to 20mA and maintains valid logic levels down to VCC = 1.2V.

What package type and footprint does MAX6364HUT29-T use, and are there lead-free options?

MAX6364HUT29-T uses the 6-pin SOT23 package (outline U6-1, land pattern 90-0175), with 0.95mm pitch and 2.9mm × 1.6mm body size. It is available in both leaded and lead-free versions: the "-T" suffix denotes standard leaded packaging, while "+T" indicates RoHS-compliant lead-free. Tape-and-reel delivery is standard, with minimum order quantity of 2500 pieces for SOT23 packaging per Maxim's ordering guidelines.