Analog Devices Inc./Maxim Integrated MAX6386XS46D2

Overview

MAX6386XS46D2 from Maxim Integrated is a low-power, open-drain active-low microprocessor supervisory circuit with factory-set 4.63V reset threshold, 20ms minimum reset timeout, and debounced manual reset input. It monitors VCC in systems requiring precise brownout detection and reliable power-on reset for embedded controllers and battery-powered instrumentation.

For engineers reviewing the MAX6386XS46D2 datasheet, MAX6386XS46D2 pinout, MAX6386XS46D2 application, or MAX6386XS46D2 equivalent, key selection factors include its ±2.5% threshold accuracy over –40°C to +125°C, guaranteed valid reset output down to VCC = 1V, 3µA supply current at 1.8V, and SC70-4 package compatibility with space-constrained PCB layouts.

Technical Context

The MAX6386XS46D2 implements a precision bandgap-based voltage comparator with internal 63kΩ pullup on MR and open-drain RESET output requiring external pullup. Its reset assertion logic responds to VCC falling below 4.63V (±2.5%) or MR being pulled low, holding RESET low for ≥20ms after recovery.

This variant belongs to the MAX6384–MAX6390 subgroup featuring manual reset input, no auxiliary RESET IN, and open-drain active-low output - distinct from push-pull variants and dual-monitoring parts like MAX6387/MAX6389. It operates across full industrial temperature range with 60ppm/°C reset threshold tempco.

Key Specifications

Pinout & Package

MAX6386XS46D2 is housed in a lead-free 4-pin SC70 package (X4-1), measuring 1.0mm × 1.0mm × 0.55mm, optimized for high-density portable designs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6386XS46D2, the LT46D2 offers identical supervision specs in a thermally superior µDFN package but occupies more area, while the MAX6326XR46D2 reduces current by 1.5µA but sacrifices manual reset capability - making it unsuitable for field-serviceable devices.

Availability

MAX6386XS46D2 is available at Aetrix Electronics and suitable for industrial PLC I/O modules, medical wearable sensors, automotive body control units, and smart energy meters requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MAX6386XS46D2 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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, automotive, and computing applications.

The MAX6381–MAX6390 family was designed specifically for low-voltage, low-power microprocessor reset supervision in space- and energy-constrained systems - emphasizing precision threshold accuracy, minimal supply current, and robust noise immunity.

FAQ

What is the exact reset threshold voltage of MAX6386XS46D2 and how tightly is it specified?

The MAX6386XS46D2 has a factory-set nominal reset threshold of 4.63V, with guaranteed tolerance of ±2.5% over the full operating temperature range of –40°C to +125°C. This specification is confirmed in the Electrical Characteristics table under "VCC Reset Threshold" and applies directly to this exact part number, as indicated by the "46" suffix in the ordering code.

Does MAX6386XS46D2 support manual reset, and what is the internal pullup value on the MR pin?

Yes, MAX6386XS46D2 features a debounced manual reset input (MR) with an internal 63kΩ pullup resistor to VCC, as documented in the Pin Description and Electrical Characteristics sections. This eliminates the need for an external pullup resistor when MR is left unconnected or driven by an open-drain source.

What package type and dimensions does MAX6386XS46D2 use, and is it lead-free?

MAX6386XS46D2 uses the 4-pin SC70 package (package code X4-1), measuring 1.0mm × 1.0mm × 0.55mm. Per the Ordering Information section, the "+T" suffix confirms it is a lead-free, RoHS-compliant device - consistent with Maxim's standard packaging for this family.

How does the reset timeout period of MAX6386XS46D2 behave over temperature?

The MAX6386XS46D2 guarantees a minimum reset timeout of 20ms across –40°C to +125°C, with typical variation less than ±5% over temperature, as shown in the "Normalized Power-Up Reset Timeout vs. Temperature" plot (toc03). The actual timeout remains well above 20ms under all conditions, ensuring robust µP hold timing.

Can MAX6386XS46D2 operate reliably at VCC = 1.0V, and what is the RESET output behavior at that voltage?

Yes, MAX6386XS46D2 guarantees valid RESET output logic state down to VCC = 1.0V, as explicitly stated in the Absolute Maximum Ratings and Detailed Description sections. At 1.0V, the open-drain RESET output maintains correct asserted (low) or deasserted (high-impedance) behavior - critical for fail-safe operation during deep brownout.