Analog Devices Inc./Maxim Integrated MAX6386XS46D1+T

Overview

MAX6386XS46D1+T from Maxim Integrated is a low-power microprocessor supervisory circuit with open-drain active-low reset output, factory-set 4.63V reset threshold (±2.5% over -40°C to +125°C), 140ms minimum manual reset timeout, and 1ms minimum VCC reset timeout. It monitors single-supply voltages from +1.8V to +5.0V and guarantees valid reset state down to VCC = 1V, used in battery-powered controllers and critical μP power monitoring.

For engineers reviewing the MAX6386XS46D1+T datasheet, MAX6386XS46D1+T pinout, MAX6386XS46D1+T application, or MAX6386XS46D1+T equivalent, key selection considerations include its 4-pin SC70 package, debounced manual reset input with internal pullup, ±2.5% threshold accuracy over temperature, and immunity to negative-going VCC transients up to 35µs at 100mV overdrive.

Technical Context

The MAX6386XS46D1+T implements a precision voltage comparator with internal 4.63V reference and a monostable timer for reset assertion timing. Its open-drain RESET output requires an external pullup resistor and remains asserted low during VCC drop below threshold or MR activation, holding for ≥140ms after MR release and ≥1ms after VCC recovery.

It features a debounced manual reset input (MR) with 63kΩ internal pullup to VCC, TTL/CMOS-compatible logic levels, and guaranteed operation from VCC = 1.0V to 5.5V. The device consumes only 3μA at +1.8V and exhibits ±60ppm/°C reset threshold tempco, ensuring stable brownout detection across automotive-grade temperature range (-40°C to +125°C).

Key Specifications

Pinout & Package

MAX6386XS46D1+T 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 MAX6326XR46D1+T and TPS3808G33DBVR, the MAX6386XS46D1+T uniquely combines 4.63V precision threshold, 140ms debounced manual reset, and open-drain output in a 4-pin SC70 - enabling compact, self-contained reset supervision without external components or layout changes for MR integration.

Availability

MAX6386XS46D1+T is available at Aetrix Electronics and suitable for industrial controllers, portable medical sensors, automotive body electronics, and handheld test equipment requiring stable component supply and long-term lifecycle support.

Supply support for MAX6386XS46D1+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 low-voltage microprocessor reset circuits optimized for space-constrained, battery-sensitive, and thermally harsh environments - targeting applications where supply monitoring integrity cannot be compromised.

FAQ

What is the exact reset threshold voltage of MAX6386XS46D1+T and how accurate is it over temperature?

The MAX6386XS46D1+T has a factory-set nominal reset threshold of 4.63V, with guaranteed accuracy 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 the MAX6386XS46D1+T variant, which uses the "46" suffix denoting the 4.63V threshold bin.

Does MAX6386XS46D1+T support manual reset, and what is the behavior of its MR pin?

Yes, MAX6386XS46D1+T includes a debounced manual reset input (MR) with an internal 63kΩ pullup resistor to VCC. Driving MR low forces an active-low reset assertion; the reset remains active for ≥140ms after MR is released. This eliminates external debounce circuitry and supports direct connection to a normally open momentary switch tied to GND.

What package type and pin count does MAX6386XS46D1+T use, and is it RoHS-compliant?

MAX6386XS46D1+T is supplied in a 4-pin SC70 package (outline 21-0098), measuring 2.0mm × 2.1mm × 0.95mm. The "+T" suffix confirms it is lead(Pb)-free and RoHS-compliant, as explicitly stated in the Ordering Information section of the datasheet.

What is the minimum VCC voltage at which MAX6386XS46D1+T guarantees correct reset output logic state?

MAX6386XS46D1+T guarantees valid reset output logic state down to VCC = 1.0V. This is specified in the Absolute Maximum Ratings and Electrical Characteristics tables, ensuring reliable operation during deep brownout conditions before complete power collapse - a critical feature for fail-safe shutdown in battery-powered systems.

How does the open-drain RESET output of MAX6386XS46D1+T differ from push-pull alternatives in system design?

The open-drain RESET output of MAX6386XS46D1+T requires an external pullup resistor but enables wired-OR connectivity with other reset sources (e.g., watchdog timers or PMICs) on the same reset bus. Unlike push-pull outputs, it avoids contention and supports mixed-voltage domain interfacing - for example, driving a 1.8V μP reset input from a 3.3V-supplied MAX6386XS46D1+T via appropriate pullup voltage.