Analog Devices Inc./Maxim Integrated MAX6361PUT44+T

Overview

MAX6361PUT44+T from Maxim Integrated is a low-power microprocessor supervisory circuit with factory-preset 4.4V reset threshold, manual reset input (MR), and active-low open-drain RESET output. It operates from +1.2V to +5.5V 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 monitoring and system reset control.

For engineers reviewing the MAX6361PUT44+T datasheet, MAX6361PUT44+T pinout, MAX6361PUT44+T application, or MAX6361PUT44+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, battery switchover hysteresis (40mV), and SOT23-6 package compatibility with space-constrained embedded designs.

Technical Context

The MAX6361PUT44+T implements a precision voltage monitor with comparator-based reset generation, integrated manual reset logic with glitch immunity (100ns), and dual-supply path control (VCC/BATT) for seamless SRAM backup switching. Its reset assertion is triggered by VCC falling below 4.4V (typ), MR low, or power failure - with propagation delay under 280µs and reset deassertion delayed ≥150ms after VCC recovery.

It features a dedicated MR input with TTL/CMOS-compatible thresholds (VIL = 0.3VCC, VIH = 0.7VCC), internal 20kΩ pull-up, and 1µs minimum pulse width support. The device operates across -40°C to +85°C, draws only 15µA typical supply current at VCC = 5.5V, and maintains functional reset output down to 1.2V supply - enabling robust operation in ultra-low-voltage battery-backed systems.

Key Specifications

Pinout & Package

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

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6361PUT44+T, the MAX6361HUT44+T offers push-pull drive for lower component count but sacrifices bus-sharing capability, while the TPS3808G33DBVR reduces supply current by 70% but omits critical battery-switchover and MR functionality required for SRAM-retention systems.

Availability

MAX6361PUT44+T is available at Aetrix Electronics and suitable for portable medical devices, industrial data loggers, retail POS terminals, and smart energy meters requiring stable component supply and long-term lifecycle support.

Supply support for MAX6361PUT44+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 battery-backed microprocessor systems needing integrated reset, manual reset, and seamless power-source switchover - specifically optimized for SRAM retention in portable and remote equipment.

FAQ

What is the exact reset threshold voltage of MAX6361PUT44+T and how is it specified?

The MAX6361PUT44+T has a factory-trimmed reset threshold of 4.4V, with guaranteed limits of 4.25V (min) and 4.50V (max) over the full -40°C to +85°C temperature range. This value is laser-trimmed during production and documented in the Electrical Characteristics table under "Reset Threshold" with suffix "UT44". The 4.4V setting is optimized for monitoring standard +5.0V power rails with adequate margin against ripple and tolerance stack-up.

Does MAX6361PUT44+T support battery backup switchover, and what are the activation conditions?

Yes, MAX6361PUT44+T supports automatic battery backup switchover. It connects the BATT pin to the OUT pin when two conditions are met: (1) VCC falls below the 4.4V reset threshold, and (2) VCC is at least 20mV lower than VBATT. A 40mV hysteresis prevents oscillation during slow VCC decay. The device does not power up from BATT alone - initial startup requires VCC to be present and above threshold.

What is the function of the MR pin on MAX6361PUT44+T, and does it require external components?

The MR (Manual Reset) pin on MAX6361PUT44+T is an active-low input that forces reset assertion when pulled low. It features an internal 20kΩ pull-up resistor to VCC, so no external pull-up is needed. A normally open momentary switch from MR to GND provides full manual reset functionality. The input is debounced against 100ns glitches and accepts standard TTL/CMOS logic levels - making it compatible with microcontroller GPIOs or discrete switches without added circuitry.

Can MAX6361PUT44+T operate reliably at very low supply voltages, and down to what level does RESET remain functional?

Yes, MAX6361PUT44+T is specified to operate from +1.2V to +5.5V and guarantees RESET output functionality down to 1.2V supply (VCC or VBATT). This allows continued reset signaling during deep brownout or near-end-of-life battery conditions. The internal voltage reference and comparator remain stable at 1.2V, and the RESET output retains defined logic states - critical for preserving system state in ultra-low-power portable applications.

What package type and RoHS status does MAX6361PUT44+T use, and are land patterns available?

MAX6361PUT44+T uses a 6-pin SOT23 package (outline U6-1, footprint 2.9mm × 1.6mm) with lead-free termination indicated by the "+T" suffix. The "+" denotes RoHS compliance per Maxim's packaging nomenclature. Official land patterns and soldering guidelines are published by Maxim (now Analog Devices) at www.analog.com/en/products/interface-power-management/supervisors.html - including IPC-compliant footprints and reflow profiles for the SOT23-6 outline.