Analog Devices Inc./Maxim Integrated MAX6388XS23D4-T

Overview

MAX6388XS23D4-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), 1120ms 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, enabling reliable power-up/brownout detection in space-constrained battery-powered systems.

For engineers reviewing the MAX6388XS23D4-T datasheet, MAX6388XS23D4-T pinout, MAX6388XS23D4-T application, or MAX6388XS23D4-T equivalent, key selection criteria include its 2.31V reset threshold accuracy, 1120ms timeout timing, 4-pin SC70 package footprint, and dual-monitoring capability via RESET IN - critical for validating multi-rail power sequencing in portable instrumentation and industrial controllers.

Technical Context

The MAX6388XS23D4-T integrates a precision bandgap reference and comparator to monitor VCC against a fixed 2.31V threshold while simultaneously accepting an external voltage on RESET IN for secondary rail supervision. Its internal timer guarantees reset assertion for ≥1120ms after VCC recovers above threshold.

RESET IN compares against a stable +1.27V internal reference; when either VCC < 2.31V or RESET IN < 1.27V, the active-high push-pull RESET output asserts and remains asserted for the full timeout period. The device ensures valid logic states down to VCC = 1.0V and provides negative-going transient immunity up to 35µs at 100mV overdrive.

Key Specifications

Pinout & Package

MAX6388XS23D4-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 - optimized for high-density PCB layouts in portable electronics.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6388XS23D4-T, the µDFN variant offers superior thermal dissipation for high-temperature deployments, while the TLV809E23DBZR reduces BOM cost and board area but sacrifices dual-rail capability and extended timeout - making MAX6388XS23D4-T optimal for compact, functionally complete reset supervision.

Availability

MAX6388XS23D4-T is available at Aetrix Electronics and suitable for portable medical sensors, industrial PLC I/O modules, automotive body control units, and smart energy meters requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MAX6388XS23D4-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 management, sensing, and interface applications in industrial, automotive, and computing markets.

The MAX6381–MAX6390 family delivers ultra-low-power, high-accuracy reset supervision for microprocessor-based systems where reliable power-up sequencing and brownout protection are mission-critical - especially in battery-operated and harsh-environment applications.

FAQ

What is the exact reset threshold voltage of MAX6388XS23D4-T and how stable is it over temperature?

The MAX6388XS23D4-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 low-drift comparator design, ensuring consistent brownout detection without external calibration. The MAX6388XS23D4-T maintains this accuracy across automotive and industrial thermal profiles, eliminating drift-related false resets.

Does MAX6388XS23D4-T support monitoring of a second voltage rail, and how is it implemented?

Yes, MAX6388XS23D4-T supports dual-rail supervision via its dedicated RESET IN pin, which compares an external voltage against an internal +1.27V reference. To monitor a second rail (e.g., 3.3V), connect a resistor divider between that rail and GND, feeding the midpoint to RESET IN. The MAX6388XS23D4-T asserts reset if either VCC drops below 2.31V or the divided voltage falls below 1.27V - enabling coordinated reset for multi-supply SoCs.

What is the guaranteed minimum reset timeout duration for MAX6388XS23D4-T, and does it vary with temperature?

The MAX6388XS23D4-T guarantees a minimum reset timeout of 1120ms after VCC rises above its 2.31V threshold. This value is specified at worst-case conditions and remains stable across temperature - typical characterization shows normalized timeout variation of ±1.5% from -40°C to +125°C. The MAX6388XS23D4-T's internal oscillator is designed for minimal tempco, ensuring predictable μP initialization timing regardless of ambient conditions.

Can MAX6388XS23D4-T operate reliably at very low supply voltages, and what is its functional lower limit?

Yes, MAX6388XS23D4-T is guaranteed to operate correctly down to VCC = 1.0V, with valid logic states on the active-high RESET output maintained throughout this range. At 1.0V, it still sinks 80µA and sources 1µA, ensuring clean reset signaling even during deep brownout. This capability makes the MAX6388XS23D4-T suitable for applications where supply voltage may dip below 1.8V during battery discharge or fault conditions.

Is MAX6388XS23D4-T compatible with standard PCB assembly processes, including lead-free reflow?

Yes, MAX6388XS23D4-T uses a RoHS-compliant 4-pin SC70 package rated for lead-free reflow soldering at +260°C peak temperature (per JEDEC J-STD-020). Its thermal resistance (θJA = 322.6°C/W on multilayer board) and moisture sensitivity level (MSL3) are fully characterized per industry standards. The MAX6388XS23D4-T is qualified for automated placement and reflow, with no special handling required beyond standard MSL3 protocols.