Analog Devices Inc./Maxim Integrated MAX6339AUT+T

Overview

MAX6339AUT+T from Maxim Integrated is a quad voltage microprocessor supervisory circuit in a 6-pin SOT23 package, monitoring +5.0V (−10%), +3.3V (−10%), +2.5V (−10%), and one user-adjustable input (1.23V internal threshold) with open-drain active-low RESET output, 140ms min reset timeout, and operation from −40°C to +85°C. It enables reliable power-up sequencing and undervoltage detection in multi-rail embedded systems.

For engineers reviewing the MAX6339AUT+T datasheet, MAX6339AUT+T pinout, MAX6339AUT+T application, or MAX6339AUT+T equivalent, key selection criteria include factory-trimmed dual-voltage thresholds, low 55µA supply current, IN2-powered operation, immunity to short transients, and guaranteed reset validity down to IN1 or IN2 = 1V.

Technical Context

The MAX6339AUT+T integrates four precision comparators with an internal 1.23V bandgap reference and factory-trimmed resistor-divider networks for fixed thresholds on IN1 (+5.0V), IN2 (+3.3V), and IN3 (+2.5V), all with −10% tolerance. The IN4 input is user-adjustable via external resistor divider referenced to the 1.23V threshold.

RESET assertion is controlled by NOR logic across all comparator outputs, with built-in 0.3% hysteresis per channel and glitch immunity up to 1000µs for overdrive ≥50mV. The open-drain output features a 10µA internal pullup to IN2 and remains valid as long as IN1 ≥1V or IN2 ≥1V.

Key Specifications

Pinout & Package

MAX6339AUT+T is housed in a 6-pin SOT23-6 package (JEDEC MO-178AA), 2.9mm × 1.6mm × 1.1mm, lead-free, tape-and-reel packaged.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS3307-33DGNR and ADM1330ARTZ-REEL7, the MAX6339AUT+T uniquely delivers four independent voltage monitoring channels-including configurable and negative-rail support-in a single 6-pin SOT23, enabling compact, high-integrity supervision without external components or layout compromise.

Availability

MAX6339AUT+T is available at Aetrix Electronics and suitable for telecommunications equipment, industrial control systems, and network-attached storage requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for MAX6339AUT+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, computing, and automotive markets.

The MAX6339AUT+T belongs to Maxim's µP supervisory product line, engineered specifically for space-constrained, multi-rail systems needing deterministic reset behavior, minimal external components, and guaranteed operation across extended temperature ranges.

FAQ

What is the function of the IN2 pin on the MAX6339AUT+T?

The IN2 pin serves a dual role: it powers the MAX6339AUT+T internally and simultaneously monitors the +3.3V supply rail with −10% threshold (2.97V–3.15V). The device guarantees RESET output validity as long as IN2 remains ≥1.0V, enabling robust operation even during partial supply collapse.

Can the MAX6339AUT+T monitor a −5V supply?

No - the MAX6339AUT+T variant is configured for +5.0V, +3.3V, +2.5V, and one adjustable input (1.23V reference). To monitor −5V, select MAX6339MUT+T or MAX6339NUT+T, which feature factory-trimmed −5V thresholds. The MAX6339AUT+T's IN4 pin supports only positive adjustable thresholds unless externally biased.

What is the reset timeout period for the MAX6339AUT+T?

The MAX6339AUT+T provides a guaranteed minimum reset timeout period of 140ms after all monitored inputs rise above their respective thresholds. This interval ensures sufficient hold time for microprocessors and FPGAs to complete internal initialization before release, and is fully specified from −40°C to +85°C.

Does the MAX6339AUT+T require external pull-up resistors on the RESET pin?

Not necessarily - the MAX6339AUT+T includes a 10µA internal pullup to IN2, sufficient to drive standard CMOS inputs when interfacing with the same 3.3V logic family. An external pullup is needed only when driving higher-voltage logic (e.g., 5V) or when faster rise times are required; the internal pullup remains active regardless of IN2 voltage down to 1V.

How does the MAX6339AUT+T handle transient noise on monitored supply lines?

The MAX6339AUT+T incorporates 0.3% hysteresis per comparator and is designed to ignore short-duration transients: it tolerates glitches ≤1000µs when the input deviates ≥50mV from threshold. This immunity is verified across temperature and ensures reliable reset assertion without false triggers in electrically noisy environments like motor drives or switching power supplies.