Analog Devices Inc./Maxim Integrated MAX6338DUB+T

Overview

MAX6338DUB+T from Maxim Integrated is a quad voltage monitor IC designed for multivoltage system supervision, monitoring +5.0V, +3.3V, and +1.8V supplies with 5% tolerance thresholds and one adjustable input (1.23V internal reference), consuming 25µA typical supply current, operating from +2.5V to +5.5V, and delivering four independent open-drain active-low outputs in a 10-pin µMAX package - used in notebook computers and industrial equipment for reliable power-good signaling.

For engineers reviewing the MAX6338DUB+T datasheet, MAX6338DUB+T pinout, MAX6338DUB+T application, or MAX6338DUB+T equivalent, key selection considerations include factory-programmed input thresholds (+5.0V/-5%, +3.3V/-5%, +1.8V/-5%), adjustable fourth input capability, guaranteed -40°C to +85°C operation, low ICC (25µA typ), and wire-ORable open-drain outputs with weak internal pull-ups to VCC.

Technical Context

The MAX6338DUB+T integrates four comparators sharing a precision 1.23V bandgap reference; IN1–IN3 are factory-set for +5.0V, +3.3V, and +1.8V nominal inputs with 5% trip thresholds (e.g., 4.75V, 3.15V, 1.62V), while IN4 is an auxiliary high-impedance input configurable via external resistor divider. Each comparator features built-in 0.3% hysteresis and drives an open-drain output with 10µA internal pull-up to VCC.

Undervoltage lockout activates below VCC = +2.5V, forcing all outputs low; propagation delay is 20µs (with 100mV overdrive); output low voltage is 0.4V at 2mA sink; threshold accuracy is ±1.5% over temperature with 60ppm/°C drift. No external components are required for fixed-threshold monitoring.

Key Specifications

Pinout & Package

The MAX6338DUB+T is housed in a 10-pin µMAX® package (3.0mm × 3.0mm, 0.6mm height, 0.5mm pitch), thermally enhanced with exposed pad (not electrically connected), compatible with standard surface-mount reflow processes.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6328DUB+T and TPS3307-33DGNR, the MAX6338DUB+T uniquely delivers +1.8V supervision at 5% tolerance with integrated pull-ups and lowest ICC - making it optimal for space-constrained, low-power multirail systems demanding precise core rail monitoring.

Availability

MAX6338DUB+T is available at Aetrix Electronics and suitable for desktop and notebook computers, industrial PLC controllers, and telecommunications line cards requiring stable component supply, long-term lifecycle support, and RoHS-compliant lead-free packaging.

Supply support for MAX6338DUB+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) is a U.S.-based semiconductor company specializing in high-performance analog, mixed-signal, and power-management ICs for industrial, computing, and communications markets.

The MAX6338DUB+T belongs to Maxim's supervisory IC product line, engineered specifically for compact, low-power multivoltage system monitoring in space- and energy-constrained embedded platforms.

FAQ

What is the exact input voltage configuration for the MAX6338DUB+T?

The MAX6338DUB+T is factory-configured to monitor +5.0V (−5% trip = 4.75V), +3.3V (−5% trip = 3.15V), +1.8V (−5% trip = 1.62V), and an adjustable fourth input (IN4) referenced to the internal 1.23V bandgap. This configuration is fixed per the "D" variant in Maxim's selector guide and cannot be altered post-manufacture.

Does the MAX6338DUB+T require external components for basic operation?

No, the MAX6338DUB+T requires no external components for monitoring its three factory-set supplies. A 0.1µF bypass capacitor on VCC is recommended for noisy environments, and external resistors are only needed if using IN4 for adjustable threshold detection - the MAX6338DUB+T integrates all reference, hysteresis, and pull-up circuitry internally.

How does the undervoltage lockout (UVLO) function in the MAX6338DUB+T?

The MAX6338DUB+T incorporates an internal UVLO circuit that forces all four outputs low whenever VCC drops below +2.5V. This ensures clean, predictable reset behavior during power ramp-up or brownout events, even down to VCC = +1V, preventing spurious output transitions during supply instability.

Can the outputs of the MAX6338DUB+T be wired together?

Yes, all four outputs of the MAX6338DUB+T are open-drain with weak internal 10µA pull-ups to VCC, enabling direct wire-OR connection to generate a single system-level "power-fail" signal. External pull-up resistors may be added to override internal pull-ups or interface with higher-voltage logic families up to +5.5V.

What is the temperature coefficient of the threshold voltage in the MAX6338DUB+T?

The MAX6338DUB+T exhibits a threshold voltage temperature coefficient of 60ppm/°C, ensuring stable trip points across the full −40°C to +85°C operating range. This low drift, combined with ±1.5% total accuracy over temperature, guarantees reliable supervision without recalibration in industrial thermal environments.