Analog Devices Inc./Maxim Integrated MAX6388XS24D3-T

Overview

MAX6388XS24D3-T from Maxim Integrated is a low-power microprocessor supervisory circuit with active-high push-pull reset output, factory-set 2.40V VCC reset threshold (±2.5% over –40°C to +125°C), 140ms minimum reset timeout, and auxiliary RESET IN input for dual-voltage monitoring. It consumes only 3μA at +1.8V and operates down to VCC = 1.0V, serving as a power-on reset and brownout detector in battery-powered embedded controllers.

For engineers reviewing the MAX6388XS24D3-T datasheet, MAX6388XS24D3-T pinout, MAX6388XS24D3-T application, or MAX6388XS24D3-T equivalent, key selection criteria include its 2.40V reset threshold accuracy, 140ms timeout timing, 4-pin SC70 package footprint, and dual-monitoring capability via RESET IN - critical for systems requiring independent core/I/O voltage supervision.

Technical Context

The MAX6388XS24D3-T integrates a precision bandgap reference and comparator to monitor VCC against a fixed 2.40V threshold while simultaneously comparing an external voltage at RESET IN to an internal 1.27V reference. Its reset assertion logic triggers on either VCC falling below 2.40V or RESET IN falling below 1.27V, with guaranteed valid output state down to VCC = 1.0V.

It features a dedicated 4-pin SC70 package with no internal NC pins, uses BiCMOS process technology, and supports negative-going VCC transient immunity up to 100µs at 100mV overdrive - enabling robust operation in noisy industrial environments without external filtering.

Key Specifications

Pinout & Package

MAX6388XS24D3-T is housed in a RoHS-compliant 4-pin SC70 package (outline 21-0098, land pattern 90-0187), optimized for space-constrained portable designs. Pin 1 is RESET (active-high push-pull), Pin 2 is VCC, Pin 3 is GND, and Pin 4 is RESET IN - no manual reset (MR) input is present.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6387XS24D3-T, MAX6388XS24D3-T eliminates external pullup requirements and simplifies interface to active-high reset inputs; versus TLV809K24DBZR, it adds critical dual-rail supervision without increasing board area or component count.

Availability

MAX6388XS24D3-T is available at Aetrix Electronics and suitable for battery-powered sensor nodes, industrial PLC I/O modules, medical wearables, and automotive body control modules requiring stable component supply and long-term lifecycle support.

Supply support for MAX6388XS24D3-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 industrial, automotive, and computing applications, emphasizing low power, high accuracy, and small form factor.

The MAX6381–MAX6390 family delivers ultra-low-power microprocessor supervisory circuits with configurable reset thresholds, timeout periods, and dual-monitoring capability - engineered specifically for space- and energy-constrained embedded systems.

FAQ

What is the exact reset threshold voltage of MAX6388XS24D3-T and how stable is it over temperature?

The MAX6388XS24D3-T has a factory-set VCC reset threshold of 2.40V nominal, with ±2.5% tolerance guaranteed over the full operating temperature range of –40°C to +125°C. This stability is achieved using a precision bandgap reference and laser-trimmed resistors, ensuring consistent brownout detection without external calibration. The MAX6388XS24D3-T maintains this accuracy across automotive and industrial thermal environments.

Does MAX6388XS24D3-T support monitoring of a second voltage rail, and how is it implemented?

Yes, MAX6388XS24D3-T includes a dedicated RESET IN pin that compares an external voltage to an internal 1.27V reference. To monitor a second rail (e.g., 2.5V or 3.3V), connect it to RESET IN through a resistor divider configured per the equation R1 = R2 × [(V_INTH/1.27V) – 1]. The MAX6388XS24D3-T asserts RESET if either VCC falls below 2.40V or the divided voltage at RESET IN drops below 1.27V.

What is the function of the RESET output on MAX6388XS24D3-T, and what are its drive capabilities?

The RESET output of MAX6388XS24D3-T is an active-high push-pull driver, meaning it actively drives high (to VCC) when asserted and actively pulls low (to GND) when deasserted - no external pullup is required. It sources up to 800µA at VCC ≥ 4.5V and sinks up to 3.2mA, supporting direct connection to most μP reset inputs. The MAX6388XS24D3-T guarantees valid logic levels down to VCC = 1.0V.

What package type and footprint does MAX6388XS24D3-T use, and are there thermal considerations?

MAX6388XS24D3-T uses a 4-pin SC70 package (outline 21-0098, land pattern 90-0187), measuring 1.6mm × 1.2mm with 0.65mm pin pitch. Its junction-to-ambient thermal resistance (θ_JA) is 322.6°C/W on a multilayer board. For continuous operation at maximum ambient temperature, power dissipation must remain below 245mW (derated above +70°C at 3.1mW/°C). The MAX6388XS24D3-T's low 3μA supply current minimizes self-heating.

How does MAX6388XS24D3-T handle short VCC transients, and what design guidance applies?

MAX6388XS24D3-T provides inherent immunity to negative-going VCC transients: it will not assert reset for glitches shorter than ~100µs when the overdrive (V_TH – V_CC) is 100mV. For enhanced robustness, place a 0.1µF ceramic capacitor as close as possible to the VCC pin. This filtering, combined with the MAX6388XS24D3-T's internal hysteresis and comparator design, prevents false resets in electrically noisy environments like motor drives or automotive systems.