Analog Devices Inc./Maxim Integrated MAX16055DAUB+T

Overview

The MAX16055DAUB+T from Maxim Integrated is a precision hex voltage microprocessor (µP) supervisory IC that monitors up to six system supply rails-including 3.3V, adjustable, 1.5V, adjustable, adjustable, and adjustable thresholds-and asserts a single active-low open-drain RESET output when any monitored voltage falls below its preset threshold. It operates from IN1 (1.0V–5.5V), features a fixed 140ms minimum reset timeout, -40°C to +125°C automotive temperature range, and internal 70µA RESET pullup to IN1. Used in servers, industrial controllers, and high-end printers for reliable power-on and brownout detection.

For engineers reviewing the MAX16055DAUB+T datasheet, MAX16055DAUB+T pinout, MAX16055DAUB+T application, or MAX16055DAUB+T equivalent, key selection criteria include factory-trimmed vs. adjustable threshold configuration (this variant: IN1=3.3V, IN2=ADJ, IN3=1.5V, IN4=ADJ, IN5=ADJ, IN6=ADJ), tolerance select (5%/10%), manual reset input, and validity condition (RESET valid if IN1 ≥1V or IN2 ≥1V).

Technical Context

The MAX16055DAUB+T implements six independent precision voltage comparators with an internal 0.5V reference and scalable resistor-divider networks for factory-set thresholds (e.g., 3.3V, 1.5V) or external divider-based adjustment down to 0.5V. Each comparator includes 0.3% VTH hysteresis to reject noise and short transients.

Its RESET output is open-drain with weak internal pullup (70µA to IN1), enabling direct interface with logic operating at different supply voltages; MR input has 20kΩ internal pullup to IN1 and supports 1µs minimum pulse width with 100ns glitch rejection. The device is powered solely from IN1 and remains functional as long as IN1 ≥1V or IN2 ≥1V.

Key Specifications

Pinout & Package

MAX16055DAUB+T is housed in a 10-pin µMAX® package (3mm × 3mm, 0.5mm pitch), RoHS-compliant and lead(Pb)-free.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX16054DAUB+T, the MAX16055DAUB+T trades fixed-rail simplicity for four adjustable inputs-critical for heterogeneous SoC platforms-while retaining identical timing, temperature rating, and layout compatibility. Against TPS3619-01DBVR, it delivers 2× more rail coverage, configurability, and automotive qualification at modest size premium.

Availability

MAX16055DAUB+T is available at Aetrix Electronics and suitable for server motherboard design, industrial PLC development, and automotive ADAS domain controller production requiring stable component supply, long-term lifecycle support, and AEC-Q100-aligned reliability data.

Supply support for MAX16055DAUB+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 and mixed-signal ICs for demanding applications in automotive, industrial, communications, and computing markets.

The MAX16055DAUB+T belongs to Maxim's µP supervisor product line, engineered specifically for compact, multi-rail power integrity monitoring in space-constrained, high-reliability systems where traditional discrete solutions introduce layout complexity and timing skew.

FAQ

What is the exact threshold configuration of the MAX16055DAUB+T?

The MAX16055DAUB+T is configured per Maxim's Selector Guide as variant 'D': IN1 = 3.3V (fixed), IN2 = adjustable, IN3 = 1.5V (fixed), IN4 = adjustable, IN5 = adjustable, IN6 = adjustable. This allows supervision of one standard rail plus five customizable rails down to 0.5V using external resistor dividers. Factory-trimmed thresholds for IN1 and IN3 are accurate to ±1.5% over temperature.

Does the MAX16055DAUB+T require external pullup resistors on the RESET output?

No - the MAX16055DAUB+T includes a 70µA internal pullup current sourced from IN1, sufficient to drive standard CMOS inputs in 3.3V systems without external components. An external pullup is only needed when interfacing with logic operating at a different voltage (e.g., 1.8V or 5V), in which case the resistor value must be selected to limit voltage rise at RESET when deasserted.

How does the MAX16055DAUB+T ensure RESET validity during partial power-up?

The MAX16055DAUB+T guarantees RESET output validity as long as either IN1 ≥1V or IN2 ≥1V - a critical feature for staged power sequencing. This means RESET remains asserted and electrically defined even if only the primary supply (IN1) or one adjustable rail (IN2) is present above 1V, preventing undefined states during boot.

Can unused adjustable inputs on the MAX16055DAUB+T be left floating?

No - unused adjustable inputs on the MAX16055DAUB+T must not be left floating. Per Maxim's Applications Information, each unused ADJ input should be connected to a supply voltage higher than its threshold (e.g., IN1) through a 100kΩ resistor to limit bias current and prevent erroneous reset assertion due to leakage or noise coupling.

What is the role of the TOL pin on the MAX16055DAUB+T, and how must it be connected?

The TOL pin on the MAX16055DAUB+T selects threshold tolerance: connect to GND for −5% deviation from nominal voltage, or to IN1 for −10% deviation. It must never be left unconnected - floating TOL causes undefined threshold behavior. This pin enables field-tuning of reset margins without changing the BOM or layout.