Analog Devices Inc./Maxim Integrated MAX6339MUT+T

Overview

MAX6339MUT+T from Maxim Integrated is a quad voltage supervisory IC that monitors +5.0V, +3.0V, adjustable-voltage, and -5.0V supplies with ±10% tolerance, asserts a single active-low open-drain RESET output, consumes 55µA typical supply current, and operates from -40°C to +85°C in a 6-pin SOT23 package-used for system integrity assurance in multi-rail embedded controllers.

For engineers reviewing the MAX6339MUT+T datasheet, MAX6339MUT+T pinout, MAX6339MUT+T application, or MAX6339MUT+T equivalent, key selection criteria include factory-trimmed threshold accuracy (e.g., +5.0V at 4.50V min), reset timeout period (140ms min), IN2-powered operation, immunity to short transients, and valid RESET assertion down to IN1 or IN2 = 1V.

Technical Context

The MAX6339MUT+T integrates an accurate bandgap reference, four precision comparators, and internal trimmed resistor-divider networks to support fixed thresholds for +5.0V, +3.0V, and -5.0V inputs while dedicating one input (IN3) to user-adjustable monitoring via external resistor-divider. Its comparator hysteresis is 0.3% of threshold voltage, enhancing noise immunity without compromising accuracy.

RESET is open-drain with a 10µA internal pullup to IN2; output low voltage is guaranteed ≤0.4V at ISINK = 2mA (VIN2 = 5V), and RESET remains asserted for ≥140ms after all monitored voltages recover-ensuring reliable µP reset sequencing in telecom and industrial power systems.

Key Specifications

Pinout & Package

The MAX6339MUT+T is housed in a 6-pin SOT23-6 package (JEDEC MO-178AA), with 1.3mm × 2.9mm footprint, 0.95mm height, and gull-wing leads. Pin 1 is marked by a dot; device orientation follows standard SOT23 top-view convention.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6340MUT+T and TPS3307-33DGNR, the MAX6339MUT+T uniquely combines quad monitoring-including dedicated −5V supervision and one user-adjustable input-in a 6-pin SOT23, making it optimal for space-constrained industrial and telecom designs requiring full rail coverage.

Availability

MAX6339MUT+T is available at Aetrix Electronics and suitable for telecommunications infrastructure, industrial PLCs, high-end network printers, and data storage enclosures requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MAX6339MUT+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, automotive, communications, and computing markets.

The MAX6339 belongs to Maxim's µP supervisory circuit product line, engineered specifically for reliable multi-rail voltage monitoring and deterministic reset generation in mission-critical embedded systems.

FAQ

What voltage rails does the MAX6339MUT+T monitor?

The MAX6339MUT+T monitors four specific rails: IN1 = +5.0V (−5% threshold), IN2 = +3.0V (−5% threshold) which also powers the device, IN3 = user-adjustable (1.23V internal reference), and IN4 = −5.0V (+10% threshold). These are factory-configured per the "M" suffix in MAX6339MUT+T and confirmed in the Selector Guide.

Does the MAX6339MUT+T require external components for basic operation?

No-MAX6339MUT+T operates without external components for its fixed-threshold inputs (IN1, IN2, IN4). Only IN3 (adjustable input) requires an external resistor-divider to set the target voltage. The open-drain RESET output includes a 10µA internal pullup to IN2, eliminating need for external pullup in many IN2-referenced logic interfaces.

What is the minimum supply voltage required for the MAX6339MUT+T to assert a valid RESET signal?

The MAX6339MUT+T guarantees valid RESET output as long as either IN1 or IN2 remains above +1.0V. This allows controlled reset assertion during power-down sequences where IN2 may decay slowly, ensuring µP reset remains active until critical rails fall below operational limits.

How does the MAX6339MUT+T handle short-duration voltage transients on monitored inputs?

The MAX6339MUT+T incorporates built-in transient immunity: it ignores IN_ voltage dips or spikes shorter than ~200µs (at 50mV overdrive), as verified in Typical Operating Characteristics (Figure MAX6339toc04). This prevents false resets caused by switching noise, relay bounce, or ESD-induced supply disturbances.

Can the MAX6339MUT+T monitor voltages other than +5V, +3V, and −5V?

Yes-via IN3, the MAX6339MUT+T supports user-adjustable monitoring using an external resistor-divider network referenced to its internal 1.23V threshold. For example, a 1.8V rail can be monitored by setting R1/R2 to scale 1.8V down to 1.23V at the comparator input, enabling flexible adaptation beyond factory-fixed options.