Analog Devices Inc./Maxim Integrated MAX6381LT26D3+T

Overview

MAX6381LT26D3+T from Maxim Integrated is a low-power microprocessor supervisory circuit with factory-set 2.63V reset threshold, 140ms minimum V_CC reset timeout, active-low open-drain reset output, and operation down to V_CC = 1.0V. It monitors single-supply rails in battery-powered systems and embedded controllers, asserting reset during brownout or power-up sequencing.

For engineers reviewing the MAX6381LT26D3+T datasheet, MAX6381LT26D3+T pinout, MAX6381LT26D3+T application, or MAX6381LT26D3+T equivalent, key selection criteria include its ±2.5% reset threshold accuracy over –40°C to +125°C, 3μA supply current at 1.8V, 6-pin μDFN package, and compatibility with dual-voltage monitoring architectures requiring auxiliary reset input capability.

Technical Context

The MAX6381LT26D3+T implements a precision bandgap-based voltage comparator with internal 2.63V threshold (±2.5% over temperature), coupled to a monolithic timer that guarantees ≥140ms reset assertion after V_CC recovers above threshold. Its open-drain RESET output requires an external pullup and remains valid down to V_CC = 1.0V, enabling reliable reset signaling even during deep brownout.

No manual reset (MR) or auxiliary RESET IN inputs are present - this variant belongs to the MAX6381 base group (3-pin SC70 / 6-pin μDFN, active-low open-drain only). It lacks debounced MR and dual-monitoring features found in MAX6384–MAX6390 and MAX6387–MAX6389 variants, respectively.

Key Specifications

Pinout & Package

Package: 6-pin µDFN (2mm × 2mm, 0.5mm pitch, L611+1 outline, RoHS-compliant).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar microprocessor reset applications.

Compared with MAX6326LTR26D3+T, the MAX6381LT26D3+T offers superior thermal performance in high-density layouts due to its 6-pin µDFN's larger copper area, while TLV803EB26DBZR trades off reset bus flexibility for lower component count - critical for high-volume production where pullup resistors add cost and placement overhead.

Availability

MAX6381LT26D3+T is available at Aetrix Electronics and suitable for portable medical sensors, industrial PLC I/O modules, automotive body control units, and smart energy meters requiring stable component supply across extended temperature and long product lifecycles.

Supply support for MAX6381LT26D3+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 and mixed-signal ICs for demanding industrial, automotive, and computing applications, with emphasis on low-power, high-reliability solutions.

The MAX6381–MAX6390 family delivers single/dual-supply microprocessor supervisory circuits optimized for battery longevity, wide-temperature operation, and noise-immune reset generation in space- and power-constrained systems.

FAQ

What is the exact reset threshold voltage of the MAX6381LT26D3+T?

The MAX6381LT26D3+T has a factory-set nominal reset threshold of 2.63V, with guaranteed tolerance of ±2.5% over the full operating temperature range of –40°C to +125°C. This value is laser-trimmed during production and does not require external calibration. The '26' suffix in MAX6381LT26D3+T explicitly denotes the 2.63V threshold per Maxim's ordering guide.

Does the MAX6381LT26D3+T support manual reset functionality?

No, the MAX6381LT26D3+T does not include a manual reset (MR) input. It belongs to the base MAX6381 series, which provides only V_CC-monitored reset with open-drain output. Manual reset capability is available only in MAX6384–MAX6386 and MAX6390 variants, as confirmed by the Pin Description table and Selector Guide in the datasheet.

What package type is used for the MAX6381LT26D3+T?

The MAX6381LT26D3+T uses a 6-pin µDFN package (2mm × 2mm, 0.5mm pitch, outline L611+1), as specified in the Ordering Information table. This RoHS-compliant package features three no-connect (N.C.) pins (Pins 4–6) and is distinct from the 3-pin SC70 option used by other MAX6381 variants like MAX6381XR26D3+T.

Can the MAX6381LT26D3+T monitor a second voltage rail?

No, the MAX6381LT26D3+T lacks an auxiliary RESET IN input. Dual-voltage monitoring is exclusive to MAX6387–MAX6389 variants, which feature a dedicated high-impedance RESET IN pin compared against an internal 1.27V reference. The MAX6381LT26D3+T monitors only the V_CC supply rail.

What is the minimum supply voltage at which the MAX6381LT26D3+T guarantees correct reset output state?

The MAX6381LT26D3+T guarantees valid reset output logic state down to V_CC = 1.0V, as stated in the Electrical Characteristics table and Detailed Description section. This ensures deterministic reset assertion even during deep brownout conditions where V_CC collapses below typical logic thresholds, preventing undefined µP behavior.