Analog Devices Inc./Maxim Integrated MAX6363LUT31+T

Overview

MAX6363LUT31+T from Maxim Integrated is a low-power microprocessor supervisory circuit with battery switchover and BATT ON status indication. It operates from +1.2V supply, features factory-preset 3.08V reset threshold (±1.5% over temperature), 150ms minimum reset timeout, and active-low push-pull RESET output. It powers SRAM during VCC brownout by switching to backup battery and asserts BATT ON high in backup mode - used in portable medical monitors and industrial data loggers requiring nonvolatile memory retention.

For engineers reviewing the MAX6363LUT31+T datasheet, MAX6363LUT31+T pinout, MAX6363LUT31+T application, or MAX6363LUT31+T equivalent, key selection criteria include guaranteed reset assertion down to 1.2V VCC/VBATT, 40mV hysteresis for stable battery switchover, 20µA typical supply current at +25°C, and SOT23-6 package compatibility with space-constrained PCB layouts.

Technical Context

The MAX6363LUT31+T implements a precision voltage monitor with internal 3.08V reference and comparator, coupled to a power-fail detection circuit that triggers battery switchover when VCC falls below VBATT by ≥20mV. Its BATT ON output is driven high only when VCC is disconnected from OUT and battery supplies OUT - not asserted during normal VCC operation or startup.

Reset logic combines VCC monitoring, manual reset input (MR) debouncing, and reset timeout timing. The push-pull RESET output guarantees valid logic levels down to 1.2V supply, with propagation delay under 300ns and glitch immunity of 100ns - enabling reliable µP initialization in noisy industrial environments.

Key Specifications

Pinout & Package

Package: 6-pin SOT23 (U6-1 outline, 2.9mm × 1.6mm × 1.1mm height). RoHS-compliant lead-free package with +T suffix.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6363HUT31+T, the MAX6363LUT31+T offers identical electrical performance at lower cost for commercial-temperature applications; versus TPS3808G30DBVR, it integrates battery switchover and status signaling - eliminating two external components and reducing board area by 22%.

Availability

MAX6363LUT31+T is available at Aetrix Electronics and suitable for portable medical monitors, industrial data loggers, POS terminals, and ruggedized handheld scanners requiring stable component supply and long-term manufacturability.

Supply support for MAX6363LUT31+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 industrial, medical, and communications applications.

The MAX6361–MAX6364 family targets low-power microprocessor systems requiring integrated power monitoring, battery backup control, and reliable reset generation - optimized for space-constrained, battery-sensitive applications.

FAQ

What is the exact reset threshold voltage of the MAX6363LUT31+T?

The MAX6363LUT31+T has a factory-preset reset threshold of 3.08V, with ±1.5% tolerance over the full -40°C to +85°C operating temperature range. This value is laser-trimmed during production and does not require external resistor programming. The "31" suffix in MAX6363LUT31+T explicitly denotes the 3.08V threshold variant per Maxim's ordering guide.

Does the MAX6363LUT31+T provide battery switchover functionality?

Yes, the MAX6363LUT31+T provides automatic battery switchover: when VCC falls below the reset threshold and drops 20mV below VBATT, it disconnects VCC from OUT and connects VBATT to OUT. The 40mV hysteresis (20mV for switchover + 20mV for recovery) prevents oscillation. This function is intrinsic to the MAX6363LUT31+T and requires no external components.

What is the purpose of the BATT ON output on the MAX6363LUT31+T?

The BATT ON output on the MAX6363LUT31+T is a dedicated status indicator that goes high only when the device is confirmed in battery-backup mode - i.e., when VCC is disconnected from OUT and OUT is actively powered by VBATT. It remains low during normal VCC operation, startup, or transient brownouts that do not trigger full switchover, enabling firmware to distinguish true backup conditions.

Can the MAX6363LUT31+T operate with a single-cell Li+ battery as the backup source?

Yes, the MAX6363LUT31+T supports single-cell Li+ batteries (2.5V–4.2V) as the VBATT source. Its VBATT input accepts voltages from 0V to +6V, and its battery switchover circuit functions correctly across the full Li+ discharge curve. The device draws only 0.05µA typical standby current from VBATT, enabling multi-year operation on standard CR2032 coin cells or Li+ packs.

What is the reset output configuration of the MAX6363LUT31+T?

The MAX6363LUT31+T features an active-low push-pull RESET output (pin 1), not open-drain. This allows direct connection to µP reset inputs without external pull-up resistors. It sources up to 500µA and sinks up to 20mA, with VOL ≤0.3V at 1.6mA sink current - ensuring valid logic levels even at 1.2V supply voltage.