Analog Devices Inc./Maxim Integrated MAX6388XS23D2-T

Overview

MAX6388XS23D2-T from Maxim Integrated is a low-power microprocessor supervisory circuit with active-high push-pull reset output, factory-set 2.31V 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, enabling use in battery-powered instrumentation and embedded controllers requiring reliable power-up/brownout detection.

For engineers reviewing the MAX6388XS23D2-T datasheet, MAX6388XS23D2-T pinout, MAX6388XS23D2-T application, or MAX6388XS23D2-T equivalent, key selection criteria include its 2.31V reset threshold accuracy, 20ms VCC reset timeout, 4-pin SC70 package footprint, RESET IN comparator compatibility with external resistor dividers, and guaranteed reset validity down to VCC = 1V.

Technical Context

The MAX6388XS23D2-T integrates a precision bandgap reference and comparator to monitor VCC against a fixed 2.31V threshold while simultaneously accepting an auxiliary voltage via RESET IN, which is compared to an internal 1.27V reference. Its reset assertion logic triggers on either VCC falling below 2.31V or RESET IN falling below its derived threshold, with independent timing control.

Reset deassertion follows a fixed 20ms timeout after VCC or RESET IN recovers above their respective thresholds. The active-high push-pull output drives high during reset and low otherwise, eliminating need for external pullup resistors, and maintains valid logic states down to VCC = 1V without external biasing.

Key Specifications

Pinout & Package

MAX6388XS23D2-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 MAX6388XS23D2-T, the μDFN variant offers improved thermal handling but demands PCB redesign, while the TPS3808G125DBVR sacrifices dual-supply monitoring and reset polarity flexibility for TI's production availability and qualification pedigree.

Availability

MAX6388XS23D2-T is available at Aetrix Electronics and suitable for industrial controllers, portable medical instruments, battery-powered IoT sensors, and dual-rail embedded systems requiring stable component supply with guaranteed long-term sourcing.

Supply support for MAX6388XS23D2-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 ultra-low-power, high-accuracy reset supervision for space- and energy-constrained microprocessor systems, emphasizing dual-rail monitoring, wide temperature operation, and minimal footprint.

FAQ

What is the exact reset threshold voltage of MAX6388XS23D2-T and how stable is it over temperature?

The MAX6388XS23D2-T has a factory-set VCC reset threshold of 2.31V, specified with ±2.5% tolerance over the full −40°C to +125°C operating range. This stability is achieved through laser-trimmed bandgap references and matched comparator design, ensuring consistent brownout detection without external calibration. The MAX6388XS23D2-T maintains this accuracy across automotive and industrial thermal environments.

Does MAX6388XS23D2-T support monitoring of a second voltage rail, and how is it implemented?

Yes, MAX6388XS23D2-T includes a dedicated RESET IN pin that connects to an internal 1.27V comparator reference. To monitor a second voltage, apply the auxiliary rail to RESET IN through a resistor divider configured per the equation R1 = R2[(V_INTH/1.27V) − 1]. The MAX6388XS23D2-T asserts reset if either VCC falls below 2.31V or the divided RESET IN voltage drops below 1.27V.

What is the function and electrical behavior of the RESET output on MAX6388XS23D2-T?

The RESET output of MAX6388XS23D2-T is an active-high push-pull driver. It drives high during reset assertion (when VCC < 2.31V or RESET IN < 1.27V) and pulls low after the 20ms timeout expires. It sources up to 800µA at VCC ≥ 4.5V and sinks up to 3.2mA, eliminating need for external pullup resistors. The MAX6388XS23D2-T guarantees valid logic levels down to VCC = 1V.

Can MAX6388XS23D2-T operate reliably during rapid VCC transients, and what protection does it offer?

MAX6388XS23D2-T incorporates negative-going VCC transient immunity: it ignores short-duration glitches (e.g., <1µs at 100mV overdrive) that would otherwise cause spurious resets. This is achieved via internal filtering and comparator hysteresis. Adding a 0.1µF ceramic capacitor close to the VCC pin further enhances noise rejection. The MAX6388XS23D2-T's robustness makes it suitable for electrically noisy industrial environments.

What package type and dimensions does MAX6388XS23D2-T use, and are PCB layout resources available?

MAX6388XS23D2-T uses a 4-pin SC70 package (outline 21-0098) measuring 2.0mm × 2.1mm × 0.95mm with 0.65mm pin pitch. Land pattern number 90-0187 defines the recommended copper footprint. Official package drawings, thermal models, and solder-reflow profiles are published on maximintegrated.com/packages. The MAX6388XS23D2-T's compact size supports high-density portable designs without sacrificing thermal margin.