Analog Devices Inc./Maxim Integrated MAX6388XS31D2-T

Overview

MAX6388XS31D2-T from Maxim Integrated is a low-power microprocessor supervisory circuit with active-high push-pull reset output, factory-set 3.08V VCC reset threshold (±2.5% over –40°C to +125°C), 20ms minimum reset timeout, and auxiliary RESET IN input for dual-voltage monitoring. It operates from 1.0V to 5.5V supply and consumes only 3μA at 1.8V, targeting power-critical embedded systems requiring reliable brownout detection.

For engineers reviewing the MAX6388XS31D2-T datasheet, MAX6388XS31D2-T pinout, MAX6388XS31D2-T application, or MAX6388XS31D2-T equivalent, key selection factors include its 4-pin SC70 package, guaranteed reset validity down to VCC = 1V, ±2.5% threshold accuracy across automotive temperature range, and dual-monitoring capability via RESET IN comparator referenced to 1.27V.

Technical Context

The MAX6388XS31D2-T integrates a precision voltage comparator for VCC monitoring and a separate high-impedance RESET IN comparator referenced to an internal 1.27V bandgap. Reset assertion occurs when either VCC falls below 3.08V or RESET IN drops below 1.27V, with propagation delay under 4.5µs.

Its active-high push-pull output drives high during reset and guarantees correct logic state down to VCC = 1V. The device uses BiCMOS process technology and supports negative-going VCC transient immunity up to 150µs for 100mV overdrive, per typical operating characteristics.

Key Specifications

Pinout & Package

MAX6388XS31D2-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 PCB layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6387XS31D2-T, the MAX6388XS31D2-T avoids external pullup components and simplifies interface to modern MCUs with active-high reset; versus TLV803EB30DBZR, it adds critical dual-rail supervision capability at the cost of one additional pin and slightly higher price.

Availability

MAX6388XS31D2-T is available at Aetrix Electronics and suitable for industrial PLC power monitoring, automotive body control modules, medical wearable battery management, and IoT edge sensor nodes requiring stable component supply and AEC-Q100-aligned performance.

Supply support for MAX6388XS31D2-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, mixed-signal, and power management ICs for demanding industrial, automotive, and computing applications.

The MAX6381–MAX6390 family delivers low-power, high-accuracy μP supervisory circuits optimized for space-constrained, battery-sensitive, and automotive-grade systems requiring dual-voltage monitoring and guaranteed reset behavior across wide temperature ranges.

FAQ

What is the exact reset threshold voltage of the MAX6388XS31D2-T and how accurate is it over temperature?

The MAX6388XS31D2-T has a factory-set VCC reset threshold of 3.08V nominal, with ±2.5% accuracy guaranteed over the full –40°C to +125°C operating temperature range. This tolerance is specified in the Electrical Characteristics table and validated across production lots using Maxim's BiCMOS process trimming. The MAX6388XS31D2-T maintains this accuracy without external calibration or compensation components.

Does the MAX6388XS31D2-T support monitoring of a second voltage rail, and if so, how is it implemented?

Yes, the MAX6388XS31D2-T supports dual-voltage supervision via its dedicated RESET IN pin. This high-impedance input compares the applied voltage against an internal 1.27V reference. To monitor a second rail, connect a resistor divider between that rail and ground, with the midpoint fed to RESET IN. The MAX6388XS31D2-T asserts reset if either VCC falls below 3.08V or the voltage at RESET IN drops below 1.27V.

What is the function of the RESET output on the MAX6388XS31D2-T, and what are its drive capabilities?

The RESET output of the MAX6388XS31D2-T is an active-high push-pull driver. During fault conditions (VCC < 3.08V or RESET IN < 1.27V), it drives high with VOH ≥ 0.8×VCC (at ISOURCE = 500µA for VCC ≥ 2.5V). When deasserted, it drives low with VOL ≤ 0.3V (at ISINK = 1.2mA for VCC ≥ 2.5V). This eliminates external pullup resistors and ensures clean, fast transitions compatible with standard CMOS reset inputs.

Can the MAX6388XS31D2-T operate reliably during deep brownout conditions, and down to what supply voltage does it guarantee correct reset behavior?

Yes, the MAX6388XS31D2-T guarantees correct RESET output logic state down to VCC = 1.0V, as confirmed in the Absolute Maximum Ratings and Electrical Characteristics sections. This ensures deterministic reset assertion even during severe brownout events where supply voltage collapses well below the 3.08V threshold. Operation ceases only below 1.0V, and the device resumes normal supervision once VCC rises above that level.

What package type and pin configuration does the MAX6388XS31D2-T use, and are there thermal considerations for PCB layout?

The MAX6388XS31D2-T uses a 4-pin SC70 package (outline 21-0098) with 2.0mm × 2.1mm footprint and 0.95mm height. Its thermal resistance is θJA = 322.6°C/W on a multilayer board. For optimal thermal performance, maximize copper area connected to the GND pin and avoid placing heat-generating components nearby. The small size supports high-density layouts but requires precise solder paste deposition and reflow profiling per JEDEC J-STD-020.