Analog Devices Inc./Maxim Integrated MAX6386LT23D3+

Overview

MAX6386LT23D3+ 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 controllers and portable instrumentation requiring reliable power-on reset under brownout conditions.

For engineers reviewing the MAX6386LT23D3+ datasheet, MAX6386LT23D3+ pinout, MAX6386LT23D3+ application, or MAX6386LT23D3+ equivalent, key selection criteria include its 2.31V threshold accuracy, 140ms reset timeout, MR input timing behavior, open-drain output compatibility with mixed-voltage systems, and 4-pin SC70 package footprint constraints.

Technical Context

The MAX6386LT23D3+ implements a precision bandgap-based voltage comparator monitoring VCC against a fixed 2.31V threshold, with ±2.5% tolerance across -40°C to +125°C and 60ppm/°C tempco. Its internal timer asserts reset for ≥140ms after VCC rises above threshold or after MR release.

It features an active-low open-drain RESET output requiring external pullup, guaranteed valid down to VCC = 1.0V, and a debounced manual reset input (MR) with 1µs minimum pulse width, 100ns glitch rejection, and 200ns MR-to-reset delay. No auxiliary voltage monitor or RESET IN pin is present.

Key Specifications

Pinout & Package

MAX6386LT23D3+ is housed in a RoHS-compliant 4-pin SC70 package (outline 21-0098, land pattern 90-0187), measuring 2.0mm × 2.1mm × 0.95mm, suitable for space-constrained portable designs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6326XR23D3+T and TPS3808G33DBVR, MAX6386LT23D3+ uniquely combines precise 2.31V supervision, 140ms timeout, and integrated MR in a 4-pin SC70-enabling compact, serviceable, and ultra-low-power reset control where sub-2.5V brownout detection is critical.

Availability

MAX6386LT23D3+ is available at Aetrix Electronics and suitable for portable medical sensors, battery-powered data loggers, industrial controller HMI panels, and smart home edge nodes requiring stable component supply with guaranteed long-term availability.

Supply support for MAX6386LT23D3+ 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 industrial, automotive, and computing applications, with emphasis on low-power, high-reliability solutions.

The MAX6381–MAX6390 family delivers single/dual low-voltage μP reset circuits optimized for battery longevity and robust operation in harsh thermal environments, targeting portable, medical, and industrial control systems.

FAQ

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

The MAX6386LT23D3+ has a factory-set nominal reset threshold of 2.31V, with guaranteed accuracy of ±2.5% over the full operating temperature range of -40°C to +125°C. Its temperature coefficient is 60ppm/°C, meaning threshold drift is bounded and predictable-critical for systems operating in automotive or outdoor industrial environments where ambient temperature varies widely.

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

Yes, MAX6386LT23D3+ includes a debounced manual reset input (MR) with an internal 63kΩ pullup resistor to VCC. The MR pin accepts TTL/CMOS logic levels: it asserts reset when driven below 0.3×VCC (for VTH < 4V) and requires a minimum pulse width of 1µs. No external components are needed-just connect a normally open switch between MR and GND for field-serviceable reset functionality.

What type of reset output does MAX6386LT23D3+ provide, and why does it require an external pullup?

MAX6386LT23D3+ provides an active-low open-drain RESET output. Because open-drain outputs can only sink current (not source), an external pullup resistor (typically 4.7kΩ–10kΩ to the host logic rail) is required to establish a defined high state when reset is deasserted. This architecture enables wired-OR reset busing and level translation across mixed-voltage systems-key advantages over push-pull alternatives.

Can MAX6386LT23D3+ operate reliably at very low supply voltages, and down to what VCC level does the reset output remain valid?

Yes, MAX6386LT23D3+ operates across a 1.0V to 5.5V supply range and guarantees correct RESET output logic state down to VCC = 1.0V. This ensures deterministic reset behavior during deep brownout events-unlike many competitors that lose output validity below 1.5V-making it suitable for ultra-low-voltage energy-harvesting and coin-cell applications where supply collapse is gradual.

What package does MAX6386LT23D3+ use, and are there any PCB layout considerations specific to this variant?

MAX6386LT23D3+ uses a 4-pin SC70 package (outline 21-0098, land pattern 90-0187), measuring 2.0mm × 2.1mm × 0.95mm. Key layout recommendations include placing a 0.1µF ceramic capacitor between VCC and GND as close as possible to the pins, minimizing trace length for MR to reduce noise pickup, and ensuring solid ground plane connection under the package to maintain thermal and electrical stability per JEDEC JESD51-7 guidelines.