Analog Devices Inc./Maxim Integrated MAX6386LT23D3+T

Overview

MAX6386LT23D3+T from Maxim Integrated is a low-power microprocessor supervisory circuit with open-drain active-low reset output, factory-set 2.31V reset threshold (±2.5% over -40°C to +125°C), 140ms minimum VCC reset timeout, and debounced manual reset input (MR) with internal 63kΩ pullup. It monitors single supply voltage in battery-powered embedded systems requiring reliable power-on reset and brownout protection.

For engineers reviewing the MAX6386LT23D3+T datasheet, MAX6386LT23D3+T pinout, MAX6386LT23D3+T application, or MAX6386LT23D3+T equivalent, key selection factors include its guaranteed reset validity down to VCC = 1V, negative-going transient immunity, 3μA supply current at 1.8V, and compatibility with dual-voltage monitoring architectures via external resistor dividers.

Technical Context

The MAX6386LT23D3+T implements a precision bandgap-based reset comparator with ±2.5% threshold accuracy across temperature, paired with a monolithic RC timer for deterministic 140ms reset assertion after VCC recovery. Its open-drain RESET output requires an external pullup and guarantees valid logic state down to VCC = 1V.

It features a dedicated MR input with internal 63kΩ pullup, supporting TTL/CMOS-compatible manual reset initiation and inherent noise immunity via 100ns glitch rejection. Unlike dual-monitor variants (e.g., MAX6387), it lacks RESET IN functionality and is optimized for single-rail VCC supervision only.

Key Specifications

Pinout & Package

MAX6386LT23D3+T is housed in a 6-pin μDFN package (1.5mm × 1.0mm, 0.5mm pitch) with wettable flanks, RoHS-compliant and lead-free.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6386LT23D3+T, the /V variant adds automotive qualification without altering performance, while TPS3808G125DBVR trades manual reset and open-drain versatility for marginally lower current - making MAX6386LT23D3+T optimal for cost-sensitive industrial designs needing both MR and bus-sharing capability.

Availability

MAX6386LT23D3+T is available at Aetrix Electronics and suitable for battery-powered portable devices, industrial microcontroller systems, medical wearable sensors, and automotive body electronics requiring stable component supply and long-term production continuity.

Supply support for MAX6386LT23D3+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, emphasizing low power, high reliability, and small form factor.

The MAX6381–MAX6390 family delivers single/dual low-voltage microprocessor supervisory circuits targeting space-constrained, battery-operated, and thermally rugged systems where deterministic reset behavior and minimal quiescent current are essential.

FAQ

What is the exact reset threshold voltage of MAX6386LT23D3+T and how stable is it over temperature?

The MAX6386LT23D3+T has a factory-set nominal reset threshold of 2.31V, with ±2.5% tolerance guaranteed over the full -40°C to +125°C operating range. This stability is achieved via laser-trimmed bandgap references and low-tempco circuit design, ensuring consistent brownout detection without external calibration - critical for applications like portable medical devices where supply rails vary with battery state of charge.

Does MAX6386LT23D3+T support manual reset, and what are the electrical requirements for the MR pin?

Yes, MAX6386LT23D3+T includes a debounced manual reset (MR) input with an internal 63kΩ pullup resistor to VCC. To assert reset, MR must be driven below 0.3×VCC (e.g., <0.69V at VCC = 2.3V); the device guarantees 100ns glitch rejection and maintains reset for the full 140ms timeout after MR is released. No external components are needed - a simple momentary switch to GND suffices.

What package type and footprint does MAX6386LT23D3+T use, and is it RoHS-compliant?

MAX6386LT23D3+T uses a 6-pin μDFN package (1.5mm × 1.0mm, 0.5mm pitch) with wettable flanks for automated optical inspection. The "+T" suffix confirms it is lead-free and RoHS-compliant per EU Directive 2011/65/EU. Land pattern number 90-0080 applies, and thermal resistance is θJA = 477°C/W on a multilayer board - enabling compact, thermally efficient placement in dense PCB layouts.

Can MAX6386LT23D3+T monitor a second voltage rail, and what alternatives exist if dual-rail supervision is needed?

No, MAX6386LT23D3+T monitors only the VCC rail and does not support auxiliary voltage monitoring. For dual-rail supervision, consider the pin-compatible MAX6387LT23D3+T, which adds a RESET IN input referenced to an internal 1.27V comparator - allowing external resistor-divider configuration to set a second independent reset threshold. Both share identical 6-pin μDFN packaging and timing characteristics.

How does the open-drain RESET output of MAX6386LT23D3+T interface with different logic families and supply voltages?

The open-drain RESET output of MAX6386LT23D3+T requires an external pullup resistor to the target logic rail (e.g., 1.8V, 3.3V, or 5V). It sinks up to 3.2mA at VCC ≥4.5V and guarantees VOL ≤0.4V under that condition - enabling interoperability across mixed-voltage systems. This architecture supports wired-OR reset buses and level translation without additional level-shifters, unlike push-pull alternatives.