Analog Devices Inc./Maxim Integrated MAX6380UR44+T

Overview

MAX6380UR44+T from Maxim Integrated is an ultra-low-power, open-drain, active-low voltage detector with a factory-trimmed 4.38V threshold, ±2.5% accuracy over temperature, 500nA supply current, and operation down to 1V VCC - designed for precision power-supply monitoring in battery-powered microcontroller reset circuits.

For engineers reviewing the MAX6380UR44+T datasheet, MAX6380UR44+T pinout, MAX6380UR44+T application, or MAX6380UR44+T equivalent, this device serves as a reliable, no-component-required reset supervisor for portable systems requiring tight threshold tolerance, transient immunity, and minimal quiescent current.

Technical Context

The MAX6380UR44+T implements a precision bandgap reference and comparator architecture with internally trimmed resistors to set its 4.38V trip point. It asserts an active-low open-drain output (OUT) when VCC falls below VTH, maintaining correct logic state down to 1V supply.

It features built-in immunity to fast negative-going VCC transients (≤200µs at 100mV overdrive), propagation delay of 9.5µs (typical), and 100mV hysteresis - all without external components or trimming.

Key Specifications

Pinout & Package

MAX6380UR44+T is housed in a 3-pin SOT23-3 package (lead-free, tape-and-reel). Pin 1 = GND, Pin 2 = OUT (open-drain), Pin 3 = VCC.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar voltage detector applications.

Compared with TLV803EB33DBVR and APX803S-43SA-7, the MAX6380UR44+T uniquely combines 4.38V precision, 500nA ultra-low ICC, and documented 200µs transient rejection - making it optimal for long-life 4.5V-system brown-out protection where open-drain interface and minimal self-load are critical.

Availability

MAX6380UR44+T is available at Aetrix Electronics and suitable for battery-powered microcontroller reset, Li-ion charger supervision, and low-power IoT node brown-out protection requiring stable component supply and guaranteed lead-free compliance.

Supply support for MAX6380UR44+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 high-performance analog, mixed-signal, and power-management ICs for demanding industrial, automotive, and computing applications.

The MAX6375–MAX6380 family was engineered specifically for ultra-low-power, single-threshold voltage monitoring in space-constrained portable equipment - eliminating external components while delivering precision and reliability across wide temperature ranges.

FAQ

What is the exact reset threshold voltage of the MAX6380UR44+T?

The MAX6380UR44+T has a factory-trimmed nominal reset threshold of 4.38V, with ±2.5% accuracy over the full industrial temperature range (-40°C to +85°C). This value is confirmed in Table 1 of the official datasheet under suffix "R44", and applies specifically to the MAX6380 series variants with 3.30V–4.63V thresholds.

Does the MAX6380UR44+T require an external pull-up resistor on the OUT pin?

Yes, the MAX6380UR44+T features an open-drain active-low output, so an external pull-up resistor is required to establish a defined high state when the output is not asserted. The datasheet recommends selecting a resistor that ensures VOL ≤0.4V at 100µA sink current while supporting the connected logic's high-level input requirements.

What is the minimum VCC voltage at which the MAX6380UR44+T guarantees correct output logic state?

The MAX6380UR44+T guarantees correct output logic state (i.e., active-low assertion when VCC < VTH and high-impedance otherwise) down to 1V VCC. This is explicitly specified in the General Description and Electrical Characteristics sections, enabling reliable operation during deep brown-out or battery depletion scenarios.

Can the MAX6380UR44+T be used with a 1.8V microcontroller I/O pin?

Yes - the MAX6380UR44+T's open-drain OUT pin can be pulled up to 1.8V using an appropriate resistor (e.g., 10kΩ), since its absolute maximum OUT voltage rating is +6V and it sinks current only. The 0.4V VOL specification at 100µA ensures compatible logic-low levels for 1.8V CMOS inputs.

How does the MAX6380UR44+T handle short voltage transients on the VCC line?

The MAX6380UR44+T is designed to ignore fast negative-going VCC transients: it will not assert reset for glitches ≤200µs duration when VCC dips 100mV below the 4.38V threshold. This immunity is characterized in the Typical Operating Characteristics graph "Maximum Transient Duration vs. Threshold Overdrive" and ensures robust operation in electrically noisy environments.