Analog Devices Inc./Maxim Integrated MAX16055DAUB+

Overview

MAX16055DAUB+ from Maxim Integrated is a precision hex voltage microprocessor (µP) supervisory IC that monitors up to six system supply rails-including 3.3V, 1.5V, and adjustable inputs-and asserts a single active-low open-drain RESET output when any monitored voltage falls below its factory-trimmed or resistor-adjusted 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 pullup on RESET. Used in servers, industrial controllers, and high-end printers for reliable power-on reset and brownout detection.

For engineers reviewing the MAX16055DAUB+ datasheet, MAX16055DAUB+ pinout, MAX16055DAUB+ application, or MAX16055DAUB+ equivalent, key selection considerations include its dual-voltage validity condition (RESET valid if IN1 ≥1V or IN2 ≥1V), tolerance-selectable thresholds (5% or 10%), immunity to short supply transients, and µMAX® 10-pin package footprint compatibility with space-constrained embedded designs.

Technical Context

The MAX16055DAUB+ integrates six independent voltage comparators with a shared precision bandgap reference and internal resistor-divider networks for factory-set thresholds, plus configurable inputs supporting external resistor dividers down to 0.5V. Its architecture ensures monotonic reset assertion across all six inputs without requiring external timing components.

Reset propagation delay is 20µs (typ) per input, with built-in 0.3% threshold hysteresis and 60ppm/°C temperature coefficient-enabling stable operation over full automotive temperature range. The MR input includes a 20kΩ internal pullup to IN1 and 100ns glitch rejection, while TOL selects nominal threshold tolerance via direct connection to GND or IN1.

Key Specifications

Pinout & Package

MAX16055DAUB+ is housed in a 10-pin µMAX® package (3mm × 3mm, 0.5mm pitch), RoHS-compliant and lead-free. Pin 1 is IN1 (power supply and monitored rail); pins 2–6 are voltage monitor inputs; pin 7 is TOL (tolerance select); pin 8 is MR (active-low manual reset); pin 9 is open-drain RESET; pin 10 is GND.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX16055DAUB+, MAX16054DAUB+ offers identical performance in a quad configuration but cannot supervise six rails, while TPS3808G33DBVR lacks multi-input coordination, manual reset, and adjustable thresholds-making it unsuitable for complex power sequencing where centralized supervision and flexibility are required.

Availability

MAX16055DAUB+ is available at Aetrix Electronics and suitable for server power sequencing, industrial PLC controllers, automotive ADAS modules, high-end network switches, and data storage equipment requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MAX16055DAUB+ 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 semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, automotive, communications, and computing markets.

The MAX16055DAUB+ belongs to Maxim's µP supervisory product line, designed specifically for compact, multi-rail power integrity monitoring in space-constrained systems where reliability across extreme temperatures and transient immunity are mandatory.

FAQ

What is the function of the TOL pin on the MAX16055DAUB+?

The TOL pin on the MAX16055DAUB+ selects the tolerance for all factory-set voltage thresholds: connecting TOL to GND configures thresholds at −5% of nominal (e.g., 3.15V for 3.3V), while connecting TOL to IN1 sets them at −10% (e.g., 2.97V). This pin must never be left floating, as undefined states may cause inconsistent reset behavior. The MAX16055DAUB+ uses this single pin to globally adjust accuracy across all six monitored rails without requiring external components.

Can the MAX16055DAUB+ monitor a 0.85V supply rail?

Yes, the MAX16055DAUB+ can monitor a 0.85V supply using one of its adjustable threshold inputs (IN2–IN6). With an internal reference of 0.5V ±1.5%, an external resistor divider scales the 0.85V rail to match the 0.5V comparator threshold. For example, R1 = 70kΩ and R2 = 100kΩ yields V_TH ≈ 0.85V. The MAX16055DAUB+ supports such configurations down to 0.5V directly and higher voltages via scaling, maintaining 1.5% accuracy across temperature.

How does the RESET output behave when IN1 drops below 1V?

When IN1 drops below 1V, the MAX16055DAUB+ RESET output becomes invalid-its state is no longer guaranteed, even if other inputs remain above their thresholds. However, if IN2 remains ≥1V, RESET remains functional and will assert low upon IN2 undervoltage. This dual-voltage validity condition (IN1 ≥1V or IN2 ≥1V) ensures robustness during asymmetric power-down sequences. The MAX16055DAUB+ continues to draw current from IN1 until it falls below 1V, after which internal circuitry disables comparator operation.

Is an external pullup resistor required for the RESET output of the MAX16055DAUB+?

No external pullup resistor is required for the MAX16055DAUB+ RESET output when interfacing with 3.3V or 2.5V logic systems, thanks to its integrated 70µA internal pullup to IN1. However, if RESET must interface with a logic rail lower than IN1 (e.g., 1.8V), an external pullup is necessary to avoid elevated voltage at the RESET node due to current flow through the internal pullup. The MAX16055DAUB+ datasheet specifies that the internal pullup ensures compatibility with common microprocessor reset inputs without added components in most standard configurations.

What is the minimum pulse width required on the MR pin to trigger a reset with the MAX16055DAUB+?

The MR pin of the MAX16055DAUB+ requires a minimum low pulse width of 1µs to reliably assert the RESET output. This specification ensures compatibility with fast GPIO outputs from modern microcontrollers and FPGAs. Once asserted, RESET remains low for the full 140ms (minimum) timeout period-even if MR is released earlier-guaranteeing sufficient system hold time. The MAX16055DAUB+ also includes 100ns glitch rejection on MR, preventing false triggers from noise or contact bounce.