Analog Devices Inc./Maxim Integrated MAX6339GUT+T

Overview

MAX6339GUT+T from Maxim Integrated is a quad voltage supervisory IC that monitors +5.0V, +3.0V, +1.8V, and adjustable threshold supplies in multi-rail systems. It features factory-trimmed thresholds (−10% tolerance), 140ms min reset timeout, 55µA supply current, and open-drain RESET output with 10µA internal pullup to IN2. It ensures reliable µP reset assertion during undervoltage events in telecom and industrial computing.

For engineers reviewing the MAX6339GUT+T datasheet, MAX6339GUT+T pinout, MAX6339GUT+T application, or MAX6339GUT+T equivalent, key selection criteria include verified −10% threshold accuracy across all four inputs, guaranteed operation down to IN1/IN2 = 1V, immunity to sub-100µs supply transients, and SOT23-6 footprint compatibility with legacy supervisory designs.

Technical Context

The MAX6339GUT+T implements four independent precision comparators referenced to a bandgap source, each with 0.3% hysteresis for noise immunity. Thresholds are set via internal resistor-divider networks for fixed options (+5.0V, +3.0V, +1.8V) and a 1.23V reference for the adjustable input (IN4). The device draws power solely from IN2, enabling self-powered monitoring of up to three additional rails.

RESET is asserted low when any monitored voltage falls below its threshold (or rises above for negative options); it remains latched low for ≥140ms after all inputs recover. The open-drain output includes a weak 10µA internal pullup to IN2, eliminating need for external pullup in same-supply logic interfaces while supporting overdrive to 0–5.5V logic levels.

Key Specifications

Pinout & Package

MAX6339GUT+T is housed in a lead-free 6-pin SOT23-6 package (2.9mm × 1.6mm × 1.1mm), optimized for high-density PCB layouts and reflow-compatible assembly.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6339GUT+T, MAX6340GUT+T offers tighter threshold tolerances and longer reset timeout but identical quad monitoring capability and SOT23-6 fit; TPS3307-33D provides triple monitoring in larger SOIC-8 with less precise 1.8V supervision-making MAX6339GUT+T optimal for space-constrained, four-rail industrial systems demanding −10% accuracy.

Availability

MAX6339GUT+T is available at Aetrix Electronics and suitable for telecommunications base stations, industrial PLC controllers, and network-attached storage systems requiring stable component supply and guaranteed −40°C to +85°C operation.

Supply support for MAX6339GUT+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, mixed-signal, and power management ICs for industrial, communications, and computing markets.

The MAX6339 belongs to Maxim's µP supervisory product line, engineered specifically for compact, low-power, multi-rail voltage monitoring in space- and reliability-critical embedded systems.

FAQ

What voltage rails does the MAX6339GUT+T monitor?

The MAX6339GUT+T monitors four specific rails: +5.0V (−10% threshold = 4.50V min), +3.0V (−10% = 2.70V min), +1.8V (−10% = 1.53V min), and one user-adjustable rail via an external resistor-divider referenced to the 1.23V internal comparator input. All thresholds are factory-trimmed and specified over −40°C to +85°C.

How does the RESET output behave during partial power loss?

The MAX6339GUT+T RESET output remains asserted low as long as either IN1 or IN2 exceeds 1.0V-even if other inputs collapse. This ensures continued system reset integrity during asymmetric brownouts. The output is open-drain with a 10µA internal pullup to IN2, allowing direct interfacing with same-supply logic without external components.

Can unused inputs be left floating on the MAX6339GUT+T?

No. Unused inputs on the MAX6339GUT+T must not float. For positive-threshold inputs (IN1, IN3, IN4 in fixed mode), tie to IN2 (≥3.0V). For negative-threshold configurations, connect to a more negative supply. Grounding or floating any input violates Absolute Maximum Ratings and may cause incorrect reset behavior or damage.

What is the maximum transient duration the MAX6339GUT+T ignores?

The MAX6339GUT+T rejects input transients shorter than approximately 100µs, as confirmed by the glitch immunity curve (MAX6339toc04). This immunity applies to all monitored inputs and prevents false resets caused by switching noise, ESD coupling, or brief load-dump events in industrial or telecom power domains.

Does the MAX6339GUT+T require external bypass capacitors?

The MAX6339GUT+T operates reliably without external bypassing, but a 0.1µF capacitor from IN2 to GND is recommended for noisy environments to enhance immunity. Additional 0.1µF caps on IN1, IN3, and IN4 further suppress high-frequency noise-especially critical when monitoring sensitive analog or low-dropout regulator outputs.