Analog Devices Inc./Maxim Integrated MAX6386XS31D5+

Overview

MAX6386XS31D5+ from Maxim Integrated is a low-power microprocessor supervisory circuit with open-drain active-low reset output, factory-set 3.08V reset threshold (±2.5% over −40°C to +125°C), and 280ms minimum VCC reset timeout. It features a debounced manual reset input (MR) with internal 63kΩ pullup and guarantees valid reset state down to VCC = 1V. Used in battery-powered embedded controllers for reliable power-up/brownout detection.

For engineers reviewing the MAX6386XS31D5+ datasheet, MAX6386XS31D5+ pinout, MAX6386XS31D5+ application, or MAX6386XS31D5+ equivalent, key selection criteria include reset threshold accuracy, MR debounce capability, open-drain drive strength at low VCC, and SC70-4 package compatibility with space-constrained portable designs.

Technical Context

The MAX6386XS31D5+ implements a precision bandgap-based voltage comparator monitoring VCC against a fixed 3.08V threshold, with ±2.5% tolerance across −40°C to +125°C and 60ppm/°C tempco. Its internal timer enforces a guaranteed-minimum 280ms reset assertion after VCC recovery.

It integrates a dedicated MR input with 1µs minimum pulse width support, 100ns glitch rejection, and 200ns MR-to-reset delay. The open-drain RESET output sinks up to 3.2mA at VCC ≥ 4.5V (VOL ≤ 0.4V) and remains functional down to VCC = 1.0V (VOL ≤ 0.3V at 80µA sink).

Key Specifications

Pinout & Package

MAX6386XS31D5+ 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 high-density PCB layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6386XS31D5+, MAX6326XR31D5+ simplifies BOM by eliminating the pullup resistor but sacrifices wired-OR flexibility, while TPS3808G30DBVR offers superior threshold precision at the cost of losing manual reset and requiring layout changes.

Availability

MAX6386XS31D5+ is available at Aetrix Electronics and suitable for portable medical sensors, industrial PLC I/O modules, automotive body control units, and smart home hub power management requiring stable component supply across extended temperature ranges.

Supply support for MAX6386XS31D5+ 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 ultra-low-power microprocessor supervisory circuits optimized for battery-operated and thermally demanding environments, featuring factory-trimmed thresholds, multiple reset timeout options, and robust MR functionality.

FAQ

What is the exact reset threshold voltage of MAX6386XS31D5+ and its tolerance over temperature?

The MAX6386XS31D5+ has a factory-set nominal reset threshold of 3.08V, with ±2.5% tolerance guaranteed over the full operating temperature range of −40°C to +125°C. This corresponds to a minimum threshold of 3.00V and maximum of 3.15V at +25°C, and maintains the same ±2.5% band across temperature extremes per the datasheet's Electrical Characteristics table.

Does MAX6386XS31D5+ support manual reset, and how is it implemented?

Yes, MAX6386XS31D5+ includes a debounced manual reset input (MR) on Pin 3. It features an internal 63kΩ pullup resistor to VCC, requiring only a momentary switch to GND for reset initiation. The device rejects glitches as short as 100ns and guarantees a minimum 1µs MR pulse width, eliminating the need for external debounce circuitry in most applications.

What is the reset output configuration of MAX6386XS31D5+, and what external components are required?

MAX6386XS31D5+ uses an open-drain active-low reset output on Pin 2. An external pullup resistor (typically 4.7kΩ to 10kΩ) to the host logic rail is mandatory. This configuration enables wired-OR connection with other reset sources and supports level translation between different voltage domains, unlike push-pull alternatives.

What is the minimum VCC voltage at which MAX6386XS31D5+ guarantees correct reset output behavior?

MAX6386XS31D5+ guarantees valid reset output state down to VCC = 1.0V. At this voltage, the open-drain RESET output maintains VOL ≤ 0.3V while sinking 80µA, ensuring compatible logic-level assertion even during deep brownout conditions where many competing supervisors cease functioning.

Is MAX6386XS31D5+ RoHS-compliant and qualified for automotive use?

Yes, MAX6386XS31D5+ carries the "+" suffix indicating lead(Pb)-free/RoHS-compliance. While the base part is rated for −40°C to +125°C operation, it is not automotive-qualified by default; automotive versions require the "/V" suffix (e.g., MAX6386XS31D5/V+T) and are AEC-Q100 qualified per the Ordering Information table.