Analog Devices Inc./Maxim Integrated MAX6388XS31D3+T

Overview

MAX6388XS31D3+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), 140ms 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-sensitive embedded systems requiring reliable brownout detection.

For engineers reviewing the MAX6388XS31D3+T datasheet, MAX6388XS31D3+T pinout, MAX6388XS31D3+T application, or MAX6388XS31D3+T equivalent, key selection criteria include its 4-pin SC70 package, guaranteed reset validity down to VCC = 1V, ±2.5% threshold accuracy over temperature, and support for secondary voltage monitoring via RESET IN comparator referenced to 1.27V.

Technical Context

The MAX6388XS31D3+T integrates a precision bandgap reference and comparator to monitor VCC against a fixed 3.08V threshold while simultaneously comparing an external voltage at RESET IN to an internal 1.27V reference. Reset assertion occurs if either monitored voltage falls below its respective threshold.

Its internal timer guarantees a minimum 140ms reset pulse width after VCC or RESET IN recovers, and the active-high push-pull output drives high during reset with VOH ≥ 0.8×VCC (ISOURCE = 150µA at VCC ≥ 1.8V) and VOL ≤ 0.3V (ISINK = 80µA at VCC ≥ 1.0V).

Key Specifications

Pinout & Package

MAX6388XS31D3+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 MAX6388LT31D3+T, the SC70 variant offers smaller size and faster assembly, while TPS3808G30DBVR trades dual-rail capability for lower quiescent current - making MAX6388XS31D3+T optimal for space-constrained dual-supply systems needing guaranteed 140ms reset hold and 3.08V precision.

Availability

MAX6388XS31D3+T is available at Aetrix Electronics and suitable for industrial PLC controllers, automotive body control modules, medical wearable sensors, and IoT edge node gateways requiring stable component supply and long-term production continuity.

Supply support for MAX6388XS31D3+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 communications applications, emphasizing reliability, low power, and high integration.

The MAX6381–MAX6390 family delivers single/dual low-voltage microprocessor supervisory circuits optimized for battery-powered and thermally demanding systems where accurate, low-current reset generation is critical.

FAQ

What is the exact reset threshold voltage of MAX6388XS31D3+T and how stable is it over temperature?

The MAX6388XS31D3+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 range. This stability is achieved through laser-trimmed on-chip resistors and a precision bandgap reference, ensuring consistent brownout detection without external calibration. The MAX6388XS31D3+T maintains this tolerance across temperature extremes, critical for automotive and industrial deployments.

Does MAX6388XS31D3+T support monitoring a second voltage rail, and how is it implemented?

Yes, MAX6388XS31D3+T includes a dedicated RESET IN pin that connects to an internal 1.27V comparator. To monitor a second voltage, apply the auxiliary rail to RESET IN through a resistor divider configured so that the divided voltage equals 1.27V at the desired trip point. The MAX6388XS31D3+T asserts reset if either VCC falls below 3.08V or the voltage at RESET IN drops below 1.27V, enabling true dual-rail supervision in compact systems.

What is the reset output configuration of MAX6388XS31D3+T and what are its drive capabilities?

MAX6388XS31D3+T features an active-high push-pull reset output. During reset, it drives high with VOH ≥ 0.8×VCC (at ISOURCE = 150µA for VCC ≥ 1.8V); when deasserted, it drives low with VOL ≤ 0.3V (at ISINK = 80µA for VCC ≥ 1.0V). This eliminates the need for an external pullup resistor and allows direct interfacing with standard CMOS/TTL reset inputs. The MAX6388XS31D3+T guarantees valid logic levels down to VCC = 1V.

How does the 140ms reset timeout of MAX6388XS31D3+T benefit system reliability?

The 140ms minimum reset timeout ensures the microprocessor remains held in reset long enough for all power supplies to stabilize, clocks to lock, and internal registers to initialize - especially critical after brownout recovery or cold start. This timeout is factory-programmed and temperature-stable (±5% over -40°C to +125°C), preventing premature release that could cause erratic firmware execution. For the MAX6388XS31D3+T, this value balances safety margin with fast system recovery in battery-operated devices.

Is MAX6388XS31D3+T qualified for automotive applications, and what packaging options support that use case?

MAX6388XS31D3+T itself is not automotive-qualified; however, the MAX6388XS31D3/V+T variant (with /V suffix) is AEC-Q100 qualified for automotive use. The +T suffix indicates tape-and-reel packaging, and the SC70 package used in MAX6388XS31D3+T meets moisture sensitivity level MSL3 requirements. For automotive designs, specify the /V version - the MAX6388XS31D3+T is intended for industrial and commercial applications where extended temperature operation (-40°C to +125°C) is required but formal AEC-Q100 certification is not mandated.