Analog Devices Inc./Maxim Integrated MAX6361LUT29+T

Overview

MAX6361LUT29+T from Maxim Integrated is a low-power microprocessor supervisory circuit with factory-preset 2.93V reset threshold, manual reset input (MR), and active-low push-pull RESET output. It operates from +1.2V to +5.5V supply, provides battery switchover control for SRAM backup, and guarantees RESET assertion down to 1.2V during brownout. Used in portable instrumentation and industrial controllers requiring reliable power-up/down sequencing.

For engineers reviewing the MAX6361LUT29+T datasheet, MAX6361LUT29+T pinout, MAX6361LUT29+T application, or MAX6361LUT29+T equivalent, key selection criteria include its 2.93V precision reset threshold, 150ms minimum reset timeout, debounced MR input with internal 20kΩ pull-up, SOT23-6 package footprint, and guaranteed operation at VCC = 1.2V - critical for ultra-low-voltage battery-powered systems.

Technical Context

The MAX6361LUT29+T integrates a precision voltage monitor, debounced manual reset input, and push-pull reset driver in a single BiCMOS IC. Its reset comparator features ±1.5% threshold accuracy over –40°C to +85°C and 150ms programmable reset timeout.

It implements battery switchover logic: when VCC falls below 2.93V and VBATT exceeds VCC by ≥20mV, OUT automatically connects to BATT to sustain SRAM. The MR input accepts TTL/CMOS levels and requires no external debounce circuitry.

Key Specifications

Pinout & Package

Package: 6-pin SOT23 (U6-1 outline, 2.1mm × 1.6mm × 1.0mm height). RoHS-compliant lead-free package marked "AAGL" per device marking code table.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6361LUT29+T, the MAX6361PUT29+T offers identical supervision accuracy and timing but requires external pull-up for reset signaling, while the TPS3808G33DBVR simplifies design for single-rail monitoring but omits battery switchover and manual reset - making MAX6361LUT29+T uniquely suited for SRAM-retention-critical portable systems.

Availability

MAX6361LUT29+T is available at Aetrix Electronics and suitable for portable medical devices, industrial PLC modules, POS terminals, and smart sensor transmitters requiring stable component supply and long-term lifecycle support.

Supply support for MAX6361LUT29+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, medical, and communications systems.

The MAX6361–MAX6364 family was engineered specifically for microprocessor-based systems needing integrated power supervision, battery switchover, and manual reset in space-constrained, low-power environments.

FAQ

What is the exact reset threshold voltage of the MAX6361LUT29+T?

The MAX6361LUT29+T has a factory-trimmed reset threshold of 2.93V, with ±1.5% accuracy over the full –40°C to +85°C operating temperature range. This value is confirmed in the Electrical Characteristics table under "Reset Threshold" for suffix "UT29", and applies to all units regardless of batch or date code. The MAX6361LUT29+T uses this precise threshold to reliably detect brownout on 3.0V or 3.3V rails without false triggering from normal supply ripple.

Does the MAX6361LUT29+T support battery backup functionality?

Yes, the MAX6361LUT29+T fully supports battery backup: when VCC drops below 2.93V and VBATT exceeds VCC by at least 20mV, the internal MOSFET automatically connects BATT to the OUT pin to sustain SRAM or other critical loads. The device draws only 0.05µA from the battery in standby, and OUT can deliver up to 10mA from BATT. This behavior is documented in the "Backup-Battery Switchover" section and Table 1 of the MAX6361LUT29+T datasheet.

What type of reset output does the MAX6361LUT29+T provide?

The MAX6361LUT29+T provides an active-low push-pull RESET output (pin 1), not open-drain. This means it actively drives LOW during reset and HIGH when released - eliminating the need for an external pull-up resistor. It can sink up to 20mA and source limited current, making it suitable for direct connection to most µP reset inputs. This output structure is explicitly defined in the Pin Description and Selector Guide for the "LUT" suffix variant of the MAX6361LUT29+T.

Can the manual reset input (MR) of the MAX6361LUT29+T be left unconnected?

Yes, the MR pin of the MAX6361LUT29+T can be left unconnected because it features an internal 20kΩ pull-up resistor to VCC, holding it at a logic HIGH under normal conditions. If used, a momentary switch to GND suffices - no external debounce components are required due to built-in filtering. This is confirmed in the "Manual Reset Input (MAX6361 Only)" section and Pin Description, where MR is specified as "debounced" with internal pull-up, making the MAX6361LUT29+T robust in noisy or space-constrained designs.

What is the minimum operating voltage for the MAX6361LUT29+T?

The MAX6361LUT29+T operates down to +1.2V on either VCC or VBATT, with RESET and RESET outputs guaranteed functional at this voltage. This is explicitly stated in the "General Description" and "Electrical Characteristics" tables under "RESET/RESET Valid Down to 1.2V Guaranteed". At 1.2V, the device maintains accurate reset assertion and release timing, enabling use in ultra-low-voltage battery systems such as single-cell Li+ or NiMH applications where the MAX6361LUT29+T ensures reliable µP supervision through deep discharge.