Analog Devices Inc./Maxim Integrated MAX6388XS21D6-T

Overview

MAX6388XS21D6-T from Maxim Integrated is a low-power microprocessor supervisory circuit with active-high push-pull reset output, factory-set 2.10V VCC reset threshold (±2.5% over -40°C to +125°C), 560ms minimum VCC 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 MAX6388XS21D6-T datasheet, MAX6388XS21D6-T pinout, MAX6388XS21D6-T application, or MAX6388XS21D6-T equivalent, key selection criteria include its 2.10V reset threshold accuracy, 560ms timeout timing, 4-pin SC70 package footprint, and dual-supply monitoring capability via RESET IN - all validated for automotive-grade (-40°C to +125°C) operation.

Technical Context

The MAX6388XS21D6-T integrates a precision voltage comparator monitoring VCC against a factory-trimmed 2.10V threshold and a second comparator monitoring external RESET IN against an internal 1.27V reference. Its reset assertion logic triggers on either VCC falling below 2.10V or RESET IN dropping below 1.27V, with independent timeout control.

It features an active-high push-pull RESET output guaranteed functional down to VCC = 1.0V, and supports noise-immune operation via negative-going VCC transient rejection up to 35µs at 100mV overdrive. The device uses BiCMOS process technology and is AEC-Q100 qualified in /V variants.

Key Specifications

Pinout & Package

MAX6388XS21D6-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 MAX6388XS21D6-T, the LT variant offers identical supervision functionality in a thermally enhanced μDFN package but demands PCB rework, while the TLV809K21DBZR reduces cost and size at the expense of losing dual-voltage monitoring - making MAX6388XS21D6-T uniquely suited for compact, dual-rail automotive and industrial systems.

Availability

MAX6388XS21D6-T is available at Aetrix Electronics and suitable for automotive engine control units, industrial PLC I/O modules, portable medical devices, and smart energy meters requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MAX6388XS21D6-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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power management solutions for industrial, automotive, communications, and computing markets.

The MAX6381–MAX6390 family was designed specifically for low-power, precision microprocessor reset supervision in harsh environments - delivering factory-trimmed thresholds, dual-rail monitoring, and AEC-Q100 qualification in ultra-small packages.

FAQ

What is the exact reset threshold voltage of MAX6388XS21D6-T and how stable is it over temperature?

The MAX6388XS21D6-T has a factory-set VCC reset threshold of 2.10V, specified with ±2.5% tolerance over the full –40°C to +125°C operating range. This stability is achieved through laser-trimmed resistors and BiCMOS process design, ensuring consistent brownout detection without external calibration. The MAX6388XS21D6-T maintains this accuracy across automotive thermal cycles, eliminating drift-related false resets.

Does MAX6388XS21D6-T support monitoring of a second voltage rail, and how is it implemented?

Yes, MAX6388XS21D6-T supports dual-voltage supervision via its dedicated RESET IN pin, which connects to an internal 1.27V comparator. To monitor a second rail (e.g., 1.8V or 3.3V), a simple resistor divider is applied to RESET IN - using R1 = R2 × ((V_INTH/1.27V) – 1). This enables precise, user-adjustable secondary threshold detection without additional ICs, a core capability of the MAX6388XS21D6-T.

What is the function of the RESET output on MAX6388XS21D6-T, and what are its drive capabilities?

The RESET output of MAX6388XS21D6-T is an active-high push-pull driver, meaning it actively pulls high during reset assertion and low otherwise - eliminating the need for an external pullup resistor. It sources ≥800µA at VCC ≥4.5V and sinks ≥3.2mA when asserted, with VOL ≤0.4V. This robust drive strength ensures reliable interfacing with modern microcontrollers' reset inputs, even under heavy capacitive loading.

How does MAX6388XS21D6-T handle short voltage transients on the VCC line?

MAX6388XS21D6-T provides built-in immunity to negative-going VCC transients: it will not assert reset for glitches shorter than 35µs when the overdrive (V_TH – V_CC) is 100mV. This is achieved through internal filtering and comparator hysteresis. For enhanced protection, a 0.1µF ceramic capacitor placed close to the VCC pin further suppresses high-frequency noise - a recommended practice confirmed in the MAX6388XS21D6-T application guidance.

Is MAX6388XS21D6-T qualified for automotive applications, and what packaging options support that qualification?

MAX6388XS21D6-T itself is not automotive-qualified; however, the /V variant (e.g., MAX6388XS21D6/V+T) carries AEC-Q100 Grade 1 qualification (-40°C to +125°C) and is offered in the same 4-pin SC70 package. The +T suffix denotes tape-and-reel packaging, and the /V marking confirms automotive compliance. Always verify ordering code suffixes - MAX6388XS21D6-T is industrial grade, while MAX6388XS21D6/V+T meets automotive requirements.