Analog Devices Inc./Maxim Integrated MAX6388XS20D4-T

Overview

MAX6388XS20D4-T from Maxim Integrated is a low-power microprocessor supervisory circuit with active-high push-pull reset output, factory-set 2.0V reset threshold (±2.5% over -40°C to +125°C), 1120ms minimum VCC reset timeout, and auxiliary RESET IN input for dual-voltage monitoring. It operates from +1.8V to +5.0V supply, consumes only 3μA at +1.8V, and guarantees valid reset state down to VCC = 1V - used in portable battery-powered equipment and dual-rail power systems.

For engineers reviewing the MAX6388XS20D4-T datasheet, MAX6388XS20D4-T pinout, MAX6388XS20D4-T application, or MAX6388XS20D4-T equivalent, key selection criteria include its 2.0V reset threshold accuracy, 1120ms reset timeout, 4-pin SC70 package, auxiliary voltage monitoring capability, and compatibility with systems requiring guaranteed reset assertion during brownout and transient conditions.

Technical Context

The MAX6388XS20D4-T integrates a precision bandgap reference and comparator to monitor VCC against a fixed 2.0V threshold, while its auxiliary RESET IN pin compares external voltage to an internal +1.27V reference. A programmable monostable timer enforces a minimum 1120ms reset assertion after VCC recovery.

Its active-high push-pull RESET output drives high upon fault detection (VCC < 2.0V or RESET IN < 1.27V) and remains asserted for ≥1120ms post-recovery; the RESET IN path includes 4.5µs propagation delay and ±50nA leakage, enabling accurate resistor-divider-based secondary supply monitoring.

Key Specifications

Pinout & Package

MAX6388XS20D4-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, with thermal resistance θ_JA = 322.6°C/W on multilayer board.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6388XS20D4-T, the D7 variant offers extended reset hold time for demanding power sequencing, while the MAX6387XS20D4-T provides pin-compatible active-low open-drain output - both retain identical supervision accuracy, dual-rail capability, and ultra-low power consumption.

Availability

MAX6388XS20D4-T is available at Aetrix Electronics and suitable for portable medical sensors, dual-rail industrial controllers, and automotive body control modules requiring stable component supply, long-term lifecycle support, and AEC-Q100–qualified alternatives.

Supply support for MAX6388XS20D4-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 power, sensing, and interface applications, with emphasis on reliability, low power, and integration.

The MAX6381–MAX6390 family delivers single/dual-supply microprocessor reset supervision in ultra-small packages, targeting space-constrained, battery-sensitive, and thermally demanding applications including automotive, industrial, and portable electronics.

FAQ

What is the exact reset threshold voltage of MAX6388XS20D4-T and how stable is it over temperature?

The MAX6388XS20D4-T has a factory-set reset threshold of 2.00V with ±2.5% accuracy over the full operating temperature range of -40°C to +125°C. This stability is achieved through laser-trimmed bandgap reference circuitry and is guaranteed by design - not just typical - ensuring consistent brownout detection in automotive and industrial environments where thermal drift could otherwise cause erratic resets.

Does MAX6388XS20D4-T support monitoring of a second voltage rail, and how is it implemented?

Yes, MAX6388XS20D4-T supports dual-voltage supervision via its dedicated RESET IN pin, which compares an external voltage to an internal +1.27V reference. To monitor a second rail (e.g., 1.8V core), connect a resistor divider between that rail and GND, feeding the midpoint to RESET IN. The device asserts reset if either VCC falls below 2.0V or the divided voltage drops below 1.27V - enabling coordinated reset for multi-rail SoCs without additional components.

What is the reset timeout duration for MAX6388XS20D4-T, and is it adjustable?

The MAX6388XS20D4-T provides a fixed minimum reset timeout of 1120ms after VCC recovers above the 2.0V threshold. This value is factory-programmed and non-adjustable - selected via the "D4" suffix in the part number. The timeout is monotonic and temperature-stable (±1.5% typical variation), ensuring predictable boot timing across all operating conditions without external timing components.

What package type and footprint does MAX6388XS20D4-T use, and are land patterns available?

MAX6388XS20D4-T uses a 4-pin SC70 package (outline 21-0098, land pattern 90-0187), measuring 2.0mm × 2.1mm × 0.95mm with gull-wing leads. Official land patterns and soldering guidelines are published by Maxim Integrated and fully supported by Aetrix Electronics' engineering team for seamless PCB integration and reflow validation.

Is MAX6388XS20D4-T qualified for automotive applications, and what certifications does it hold?

The MAX6388XS20D4-T is not the automotive-grade variant; it carries the "+T" RoHS-compliant suffix but lacks the "/V" AEC-Q100 qualification. For automotive use, the pin-compatible MAX6388XS20D4/V+T is specified - same electrical performance and 4-pin SC70 package, but tested per AEC-Q100 Grade 2 (-40°C to +105°C) with enhanced reliability screening. Always verify the full part number suffix for qualification status.