Analog Devices Inc./Maxim Integrated MAX6361PUT31+T

Overview

MAX6361PUT31+T from Maxim Integrated is a low-power microprocessor supervisory circuit with manual reset input, factory-preset 3.08V reset threshold, and active-low open-drain reset output. It operates from +1.2V supply, provides battery switchover control for SRAM backup, guarantees RESET assertion down to 1.2V, and delivers 150ms minimum reset timeout - used in portable instrumentation and industrial controllers requiring reliable brownout protection.

For engineers reviewing the MAX6361PUT31+T datasheet, MAX6361PUT31+T pinout, MAX6361PUT31+T application, or MAX6361PUT31+T equivalent, key selection criteria include its SOT23-6 package, 3.08V ±1.5% reset threshold accuracy over -40°C to +85°C, manual reset debouncing capability, battery-on mode detection logic, and guaranteed operation at VCC as low as 1.2V during power collapse.

Technical Context

The MAX6361PUT31+T integrates a precision voltage comparator, debounced manual reset input (MR) with internal 20kΩ pull-up, and open-drain active-low RESET output. Its reset assertion is triggered by VCC falling below 3.08V, MR pulled low, or power failure - with hysteresis preventing chatter during slow VCC decay.

Battery switchover occurs when VCC drops below VBATT − 0.15V, connecting BATT to OUT to sustain SRAM; OUT sources up to 150mA from VCC or switches to battery with <1µA standby current at VBATT = 2.8V. The device guarantees RESET/RESET validity down to 1.2V on either VCC or VBATT rails.

Key Specifications

Pinout & Package

Package: 6-pin SOT23 (U6-1), RoHS-compliant, -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 MAX6361PUT31+T, the MAX6361HUT31+T offers simplified reset drive but sacrifices bus-sharing flexibility, while the TPS3808G30DBVR reduces cost and complexity at the expense of manual reset and battery management functions essential for SRAM-retention systems.

Availability

MAX6361PUT31+T is available at Aetrix Electronics and suitable for portable medical monitors, industrial PLC I/O modules, handheld test equipment, smart energy meters, and battery-backed data loggers requiring stable component supply across long production lifecycles.

Supply support for MAX6361PUT31+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 interface applications in industrial, automotive, and computing markets.

The MAX6361–MAX6364 family was engineered specifically for µP-based systems needing integrated power supervision, battery switchover, and manual reset - targeting portable, battery-critical, and high-reliability embedded applications.

FAQ

What is the exact reset threshold voltage of the MAX6361PUT31+T?

The MAX6361PUT31+T has a factory-preset reset threshold of 3.08V, with ±1.5% tolerance over the full -40°C to +85°C temperature range. This value is laser-trimmed during production and specified in the Electrical Characteristics table of the MAX6361–MAX6364 datasheet Rev 4. The '31' suffix in MAX6361PUT31+T explicitly denotes the 3.08V threshold variant.

Does the MAX6361PUT31+T support battery backup for SRAM, and how does switchover work?

Yes, the MAX6361PUT31+T supports battery backup for SRAM via its BATT and OUT pins. When VCC falls below VBATT − 0.15V, an internal MOSFET connects the backup battery to OUT, sustaining SRAM voltage. Switchover includes 40mV hysteresis to prevent oscillation during slow VCC decay. The MAX6361PUT31+T guarantees OUT operation down to 1.2V on either rail.

What is the function of the MR pin on the MAX6361PUT31+T, and does it require external components?

The MR (Manual Reset) pin on the MAX6361PUT31+T is a debounced, active-low input that forces reset when pulled low. It features an internal 20kΩ pull-up resistor to VCC, so no external pull-up is required. A normally open momentary switch from MR to GND provides full manual reset functionality; external debounce circuitry is unnecessary due to built-in filtering.

Can the MAX6361PUT31+T operate with a 1.2V supply, and what happens to RESET output at that voltage?

Yes, the MAX6361PUT31+T is fully specified to operate with VCC or VBATT as low as +1.2V. Its RESET output remains functional and guaranteed to assert correctly - either low (for active-low open-drain) or high (for active-high variants) - down to this voltage. This ensures reliable µP reset signaling even during deep brownout conditions where other supervisors fail.

What package type and RoHS status does the MAX6361PUT31+T use?

The MAX6361PUT31+T uses a 6-pin SOT23 package (package code U6-1, outline 21-0058) and is RoHS-compliant. The '+T' suffix explicitly indicates lead-free, halogen-free packaging per JEDEC J-STD-020. It is rated for -40°C to +85°C operation and features a moisture sensitivity level (MSL) of 1.