Analog Devices Inc./Maxim Integrated MAX16055CAUB+T

Overview

MAX16055CAUB+T from Maxim Integrated is a precision hex voltage microprocessor (µP) supervisory IC that monitors up to six system supply voltages-including 3.3V, adjustable, and 1.8V inputs-and asserts a single active-low open-drain RESET when any falls below its threshold. It operates from IN1 (1.0V–5.5V), features fixed 140ms min reset timeout, -40°C to +125°C automotive temperature range, and 10-pin µMAX (3mm × 3mm) package for space-constrained embedded power management.

For engineers reviewing the MAX16055CAUB+T datasheet, MAX16055CAUB+T pinout, MAX16055CAUB+T application, or MAX16055CAUB+T equivalent, key selection criteria include factory-trimmed vs. adjustable threshold configuration (IN2/IN3/IN5/IN6 = ADJ per Selector Guide), tolerance select (5%/10% via TOL pin), reset validity condition (IN1 ≥1V or IN2 ≥1V), and internal 70µA RESET pullup sourcing from IN1.

Technical Context

The MAX16055CAUB+T implements six independent voltage comparators with a shared precision bandgap reference and internal resistor-divider networks for factory-set thresholds (e.g., 3.3V on IN1, 1.8V on IN4), plus four adjustable inputs (IN2, IN3, IN5, IN6) referenced to a 0.5V internal threshold. Each comparator includes 0.3% VTH hysteresis to reject noise and short transients.

Its reset logic combines asynchronous assertion (any input < VTH) with synchronous deassertion: RESET remains low for ≥140ms after all monitored supplies exceed their respective VTH + VHYST, and RESET output state is guaranteed valid only while IN1 ≥1V or IN2 ≥1V-enabling robust brownout detection in multi-rail systems without external supervision.

Key Specifications

Pinout & Package

Package: 10-pin µMAX (3mm × 3mm, U10+2 footprint), RoHS-compliant, lead-free.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX16054CAUB+T and TPS3808G33DBVR, the MAX16055CAUB+T uniquely balances factory-set precision (IN1/IN4) with four field-configurable inputs-enabling one-device coverage of hybrid power architectures common in next-gen edge computing and ADAS platforms.

Availability

MAX16055CAUB+T is available at Aetrix Electronics and suitable for industrial PLC controllers, automotive ADAS domain controllers, high-density telecom line cards, medical imaging power subsystems, and networking equipment requiring stable component supply across extended temperature ranges.

Supply support for MAX16055CAUB+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 precision analog, mixed-signal, and power management ICs for demanding industrial, automotive, and communications applications.

The MAX16055CAUB+T belongs to Maxim's µP supervisor product line, engineered specifically for compact, high-reliability monitoring of multi-rail systems in automotive and industrial environments where space, temperature resilience, and configurable threshold flexibility are critical.

FAQ

What voltage rails does the MAX16055CAUB+T monitor by default?

The MAX16055CAUB+T monitors IN1 at 3.3V (factory-set) and IN4 at 1.8V (factory-set), with IN2, IN3, IN5, and IN6 configured as adjustable inputs per the Selector Guide C option. This allows simultaneous supervision of standard rails and custom low-voltage domains. The MAX16055CAUB+T does not monitor fixed values on IN2/IN3/IN5/IN6-those require external resistor dividers to set thresholds down to 0.5V.

How does the TOL pin affect threshold accuracy on the MAX16055CAUB+T?

The TOL pin selects between two factory-trimmed tolerance bands: connecting TOL to GND sets thresholds at −5% of nominal (e.g., 3.15V for 3.3V IN1), while connecting TOL to IN1 sets them at −10% (e.g., 2.97V). This dual-option design eliminates need for external trimming components. The MAX16055CAUB+T's electrical characteristics table confirms ±0.5% typical variation within each tolerance mode across −40°C to +125°C.

Can the MAX16055CAUB+T assert RESET if IN1 drops below 1.0V?

No-the MAX16055CAUB+T guarantees RESET output validity only while IN1 ≥1.0V or IN2 ≥1.0V. If both fall below 1.0V, RESET becomes undefined per datasheet Note 4. This guardband ensures reliable reset signaling during partial brownout conditions but requires system-level design to maintain at least one valid supply (e.g., keep IN2 tied to a hold-up capacitor or always-on 3.3V rail).

What is the purpose of the 70µA internal pullup on the MAX16055CAUB+T RESET pin?

The 70µA internal pullup on the MAX16055CAUB+T RESET pin sources current from IN1, enabling direct interface with same-rail logic (e.g., 3.3V MCU) without external components. When interfacing to lower-voltage logic (e.g., 1.8V), an external pullup resistor is required-but the internal pullup prevents reverse current flow into the RESET node, eliminating risk of backfeeding. This feature reduces BOM count and layout complexity in multi-voltage systems.

Does the MAX16055CAUB+T support manual reset functionality?

Yes-the MAX16055CAUB+T includes an active-low MR (Manual Reset) input (Pin 8) with internal 20kΩ pullup to IN1. Driving MR low forces RESET low immediately and holds it asserted for the full 140ms timeout after MR returns high. The MR pin rejects glitches <100ns and requires only a 1µs minimum pulse width, making it suitable for pushbutton or microcontroller-driven reset initiation in safety-critical applications.