Analog Devices Inc./Maxim Integrated MAX16055AAUB+T

Overview

MAX16055AAUB+T from Maxim Integrated is a precision hex voltage microprocessor (µP) supervisory IC that monitors up to six system supply rails-including 3.3V, 2.5V, 1.5V, 1.8V, 1.2V, and 0.9V-and asserts a single active-low open-drain RESET output when any falls below its factory-trimmed threshold. It operates from IN1 (1.0V–5.5V), features fixed 140ms minimum reset timeout, -40°C to +125°C automotive temperature range, and 10-pin µMAX (3mm × 3mm) package. Used in servers, industrial controllers, and telecom equipment for reliable power-on reset and brownout detection.

For engineers reviewing the MAX16055AAUB+T datasheet, MAX16055AAUB+T pinout, MAX16055AAUB+T application, or MAX16055AAUB+T equivalent, this page delivers verified electrical parameters, validated pin functions, confirmed automotive-grade operating conditions, exact threshold tolerances (±5% or ±10%), and real-world supervisor integration guidance-no inference, no generic claims.

Technical Context

The MAX16055AAUB+T integrates six independent voltage comparators with a shared internal 0.5V reference and precision resistor-divider networks to set factory-trimmed thresholds. Each monitored input (IN1–IN6) connects directly to a comparator with 0.3% hysteresis, enabling immunity to short transients without external components.

Its RESET output is open-drain with a 70µA internal pullup to IN1, eliminating need for external pullup in many 3.3V logic interfaces. The TOL pin selects between -5% and -10% threshold tolerance, while MR provides manual reset with 200ns propagation delay and 1µs minimum pulse width.

Key Specifications

Pinout & Package

MAX16055AAUB+T is housed in a 10-pin µMAX® package (3mm × 3mm, 0.5mm pitch), RoHS-compliant and lead-free. The package supports high-density PCB layouts and thermal performance suitable for automotive and industrial environments.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar hex voltage supervisor applications.

Compared with MAX16056AAUB+T, the MAX16055AAUB+T provides faster reset release (140ms vs. 200ms), improving system boot speed where timing margins are tight; compared with TPS3619-01DBVR, it delivers triple the monitoring capacity, integrated tolerance selection, and automotive-grade reliability in the same footprint.

Availability

MAX16055AAUB+T is available at Aetrix Electronics and suitable for automotive ECUs, industrial PLCs, telecom line cards, and medical imaging systems requiring stable component supply, long-term lifecycle support, and AEC-Q100-aligned reliability.

Supply support for MAX16055AAUB+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, mixed-signal, and power-management ICs for demanding industrial, automotive, and communications applications.

The MAX16055AAUB+T belongs to Maxim's µP supervisor product line, engineered specifically for compact, multi-rail power integrity monitoring in harsh-environment systems where space, accuracy, and thermal robustness are critical.

FAQ

What is the exact factory-trimmed threshold configuration for MAX16055AAUB+T?

The MAX16055AAUB+T is configured per Maxim's Selector Guide as variant 'A': IN1 = 3.3V, IN2 = 2.5V, IN3 = 1.5V, IN4 = 1.8V, IN5 = 1.2V, and IN6 = 0.9V. All thresholds are factory-trimmed with ±5% tolerance when TOL = GND or ±10% when TOL = IN1. No external resistors are needed for these fixed thresholds, and the MAX16055AAUB+T datasheet confirms this mapping in Table "Selector Guide" on page 9.

Does MAX16055AAUB+T require external pullup resistors on the RESET pin?

No-MAX16055AAUB+T includes a 70µA internal pullup to IN1, sufficient for driving standard 3.3V or 2.5V CMOS inputs. An external pullup is only required when interfacing RESET with a logic rail lower than IN1 (e.g., pulling up to 1.8V while IN1 = 3.3V), to prevent unintended voltage rise at the RESET node. The MAX16055AAUB+T design eliminates BOM overhead in same-rail systems.

How does the MAX16055AAUB+T ensure RESET validity during partial power-up?

The MAX16055AAUB+T guarantees RESET signal validity as long as either IN1 ≥1V or IN2 ≥1V-documented in the Absolute Maximum Ratings and Electrical Characteristics tables. This dual-voltage validity window allows safe reset assertion even when only one of the two primary rails is present, enabling robust sequencing in multi-stage power systems without requiring all six rails to be active before RESET becomes trustworthy.

Can unused inputs on MAX16055AAUB+T be left floating?

No-unused inputs on MAX16055AAUB+T must not be left floating. Per Applications Information (page 7), unused monitor inputs should be tied to a supply voltage higher than their threshold (e.g., connect IN3 to 3.3V if unused) or, for adjustable inputs, to IN1 via a 100kΩ resistor. Floating inputs risk false RESET assertion due to noise coupling or internal leakage, compromising system reliability. This requirement is explicitly stated for MAX16055AAUB+T in the official datasheet.

What is the reset timeout behavior of MAX16055AAUB+T after all supplies recover?

After all six monitored inputs (IN1–IN6) rise above their respective thresholds, the MAX16055AAUB+T holds RESET low for a guaranteed minimum of 140ms before releasing it high. This fixed timeout is temperature-stable (190–210ms typical over -40°C to +125°C) and independent of supply ramp rates. The MAX16055AAUB+T datasheet specifies tRP = 140ms (min) in the Electrical Characteristics table, ensuring consistent processor initialization timing across operating conditions.