Analog Devices Inc./Maxim Integrated MAX16055HAUB+T

Overview

MAX16055HAUB+T from Maxim Integrated is a precision hex voltage microprocessor (µP) supervisory IC that monitors up to six system supply rails-including one fixed 3.3V input (IN1) and five adjustable-threshold inputs-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 factory-trimmed thresholds with ±5% or ±10% tolerance selection, delivers 140ms minimum reset timeout, and supports automotive-grade operation from –40°C to +125°C.

For engineers reviewing the MAX16055HAUB+T datasheet, MAX16055HAUB+T pinout, MAX16055HAUB+T application, or MAX16055HAUB+T equivalent, key selection considerations include its 10-pin µMAX package, dual-voltage validity condition (RESET valid if IN1 ≥1V or IN2 ≥1V), 70µA internal RESET pullup to IN1, immunity to short supply transients, and support for monitoring down to 0.5V via external resistor dividers on adjustable inputs.

Technical Context

The MAX16055HAUB+T implements six independent voltage comparators referenced to a precision internal bandgap, each with 0.3% hysteresis to reject noise and transient glitches. Its architecture uses scalable resistor-divider networks for fixed thresholds and direct comparator inputs with internal 0.5V reference for adjustable channels-enabling accurate monitoring of sub-1V supplies like core logic or DDR termination rails.

Power is derived solely from IN1, which also serves as the primary monitored rail and internal pullup source for the open-drain RESET output. The TOL pin selects between –5% and –10% threshold tolerance, while MR provides asynchronous manual reset with 20kΩ internal pullup and 100ns glitch rejection-ensuring robust control in noisy industrial or automotive environments.

Key Specifications

Pinout & Package

MAX16055HAUB+T is housed in a 10-pin µMAX® package (3mm × 3mm, 0.8mm height), optimized for space-constrained PCB layouts in telecom and automotive modules.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX16054HAUB+T and TPS3808G33DBVR, the MAX16055HAUB+T uniquely combines six-channel supervision, five adjustable inputs, automotive temperature rating, and single-package integration - reducing PCB footprint by >75% versus discrete solutions while enabling flexible low-voltage monitoring essential for modern processors.

Availability

MAX16055HAUB+T is available at Aetrix Electronics and suitable for automotive engine control units, industrial programmable logic controllers, telecom base station power sequencing, and high-end server voltage margining requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for MAX16055HAUB+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 semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for demanding industrial, automotive, and communications applications.

The MAX16055HAUB+T belongs to Maxim's µP supervisory product line, designed specifically to replace discrete voltage-monitoring circuits in safety-critical, space-constrained systems requiring guaranteed reset behavior across extreme temperatures and noisy power environments.

FAQ

What is the function of the TOL pin on the MAX16055HAUB+T?

The TOL pin on the MAX16055HAUB+T selects the threshold tolerance for all monitored inputs: connecting TOL to GND sets thresholds at –5% of nominal voltage, while connecting TOL to IN1 sets them at –10%. This configuration directly affects the hysteresis and accuracy envelope of each comparator and must not be left floating. The MAX16055HAUB+T datasheet specifies exact voltage tolerances for both settings across temperature.

Can the MAX16055HAUB+T monitor a 0.85V supply rail?

Yes, the MAX16055HAUB+T can monitor a 0.85V rail using one of its adjustable inputs (IN2–IN6). Since the internal reference is 0.5V, a resistor divider is required: for 0.85V, R1 ≈ 70kΩ and R2 ≈ 100kΩ yields V_TH = 0.5V × (R1 + R2)/R2 ≈ 0.85V. The MAX16055HAUB+T supports such configurations with 1.5% accuracy and built-in 1.5V input clamping to limit bias current.

Does the MAX16055HAUB+T require an external pullup resistor on the RESET pin?

No, the MAX16055HAUB+T includes a 70µA internal pullup resistor to IN1 on the open-drain RESET output, eliminating the need for an external pullup when interfacing with logic operating from the same supply as IN1. An external pullup is only required when driving logic with a different voltage rail - in which case the MAX16055HAUB+T's internal circuitry prevents reverse current flow.

How does the MAX16055HAUB+T ensure RESET validity during partial power loss?

The MAX16055HAUB+T maintains RESET validity as long as either IN1 ≥1V or IN2 ≥1V - a dual-voltage validity condition that allows continued supervision during partial supply failure. This design ensures the RESET signal remains electrically defined and functional even when other monitored rails collapse, preventing undefined states in downstream logic. The MAX16055HAUB+T specification guarantees this behavior across –40°C to +125°C.

What is the minimum pulse width required on the MR pin of the MAX16055HAUB+T?

The MR pin of the MAX16055HAUB+T requires a minimum low-pulse width of 1µs to reliably trigger a manual reset event. The device incorporates 100ns glitch rejection to ignore noise spikes, ensuring only intentional reset commands propagate. After MR returns high, the MAX16055HAUB+T holds RESET low for the full 140ms (min) timeout period regardless of MR timing - guaranteeing consistent reset duration.