Analog Devices Inc./Maxim Integrated MAX16055EAUB+T

Overview

MAX16055EAUB+T from Maxim Integrated is a precision hex voltage microprocessor (µP) supervisory IC that monitors six system supply voltages-including 3.3V, 2.5V, and adjustable inputs down to 0.5V-and asserts a single active-low open-drain RESET output when any falls below its threshold. It features factory-trimmed thresholds with ±5% or ±10% tolerance selection, 140ms minimum reset timeout, and operates across -40°C to +125°C for automotive-grade reliability.

For engineers reviewing the MAX16055EAUB+T datasheet, MAX16055EAUB+T pinout, MAX16055EAUB+T application, or MAX16055EAUB+T equivalent, key selection considerations include its 10-pin µMAX package, dual power-valid condition (IN1 ≥1V or IN2 ≥1V), internal 70µA RESET pullup, manual reset input with 20kΩ internal pullup, and immunity to short supply transients in multi-rail embedded systems.

Technical Context

The MAX16055EAUB+T integrates six independent voltage comparators with a shared precision bandgap reference and programmable hysteresis (0.3% of V_TH). Its architecture supports mixed monitoring: IN1 powers the device and serves as a monitored rail; IN2–IN6 accept either factory-set thresholds (e.g., 3.3V/2.5V for this 'E' variant) or adjustable inputs using external resistor dividers referenced to a 0.5V internal threshold.

Reset assertion logic combines analog undervoltage detection with digital timing control: RESET remains low for ≥140ms after all inputs recover above their respective thresholds plus hysteresis, and stays valid only while IN1 or IN2 exceeds 1V-enabling robust power sequencing in systems with asymmetric supply ramp rates.

Key Specifications

Pinout & Package

MAX16055EAUB+T is housed in a 10-pin µMAX® package (3mm × 3mm, 0.5mm pitch), optimized for space-constrained automotive and computing modules.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS3808G33DBVR and ADM1266ACPZ, the MAX16055EAUB+T delivers true six-rail monitoring in a minimal 3mm × 3mm footprint with zero configuration overhead, making it optimal for cost-sensitive, space-constrained applications requiring deterministic hardware-only reset behavior.

Availability

MAX16055EAUB+T is available at Aetrix Electronics and suitable for automotive ADAS ECUs, industrial PLC controllers, and server memory modules requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MAX16055EAUB+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 semiconductors for automotive, industrial, communications, and computing markets.

The MAX16055EAUB+T belongs to Maxim's µP supervisory product line, engineered specifically for compact, multi-rail power integrity monitoring in harsh-environment systems where reliability, small size, and deterministic reset timing are mandatory.

FAQ

What is the exact function of the TOL pin on the MAX16055EAUB+T?

The TOL pin on the MAX16055EAUB+T selects threshold tolerance: connecting TOL to GND sets factory-trimmed thresholds at −5% of nominal voltage (e.g., 2.375V for 2.5V rail), while connecting TOL to IN1 sets them at −10% (e.g., 2.25V). This pin must not be left floating, as undefined states may cause inconsistent reset behavior. The MAX16055EAUB+T uses this feature to accommodate varying DC-DC regulator tolerances without external components.

Does the MAX16055EAUB+T require external components for basic operation?

The MAX16055EAUB+T requires only a 0.1µF bypass capacitor from IN1 to GND for stable operation. No external resistors are needed for fixed-threshold inputs (IN1, IN2, IN4), and the internal 70µA RESET pullup eliminates external pullup resistors when interfacing with logic powered from IN1. External resistor dividers are required only for adjustable inputs (IN3, IN5, IN6) to set custom thresholds. Thus, the MAX16055EAUB+T achieves full six-rail supervision with minimal external parts.

How does the MAX16055EAUB+T ensure RESET validity during partial power loss?

The MAX16055EAUB+T guarantees RESET validity as long as either IN1 or IN2 remains ≥1V - enabling reliable reset assertion even when other monitored rails (IN3–IN6) collapse. This dual-power-valid condition prevents premature RESET deassertion during asymmetric power-down sequences, such as when a 3.3V system rail remains active longer than a 1.2V core rail. The MAX16055EAUB+T leverages this architecture to maintain deterministic behavior in automotive and industrial brownout scenarios.

Can the MAX16055EAUB+T monitor voltages lower than 0.9V?

Yes - the MAX16055EAUB+T supports monitoring down to 0.5V using its adjustable threshold inputs (IN3, IN5, IN6), each referenced to an internal 0.5V precision voltage. By adding an external resistor divider, users can scale higher input voltages (e.g., 1.2V, 1.5V) to match the 0.5V reference, achieving ±1.5% accuracy. Fixed thresholds on the MAX16055EAUB+T start at 0.9V, but the adjustable capability extends coverage meaningfully below that, unlike most competing hex supervisors.

What is the significance of the 140ms minimum reset timeout in the MAX16055EAUB+T?

The 140ms minimum reset timeout in the MAX16055EAUB+T ensures the RESET signal remains asserted long enough for modern microprocessors, FPGAs, and SoCs to complete internal power-on reset sequences - including PLL lock, memory initialization, and boot ROM validation. This value exceeds JEDEC JESD22-B100 requirements for most ARM Cortex-A/M series and Intel Atom derivatives. The MAX16055EAUB+T implements this timeout with internal RC timing, eliminating variability from external capacitors and ensuring consistent behavior across temperature and voltage.