Analog Devices Inc./Maxim Integrated MAX6388XS17D7-T

Overview

MAX6388XS17D7-T from Maxim Integrated is a low-power microprocessor supervisory circuit with active-high push-pull reset output, factory-set 1.67V VCC reset threshold (±2.5% over –40°C to +125°C), 1200ms 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-sensitive embedded systems requiring reliable brownout detection.

For engineers reviewing the MAX6388XS17D7-T datasheet, MAX6388XS17D7-T pinout, MAX6388XS17D7-T application, or MAX6388XS17D7-T equivalent, key selection criteria include its 1.67V reset threshold accuracy, 1200ms VCC timeout, 4-pin SC70 package, auxiliary voltage monitoring capability, and guaranteed reset validity down to VCC = 1V.

Technical Context

The MAX6388XS17D7-T integrates a precision bandgap reference and comparator to monitor VCC against a fixed 1.67V threshold, asserting RESET when VCC falls below this level. Its internal timer guarantees a minimum 1200ms reset assertion after VCC recovers above threshold.

A dedicated high-impedance RESET IN input compares external voltage to an internal 1.27V reference, enabling user-defined secondary reset thresholds via resistor divider. The active-high push-pull RESET output drives logic-high during fault conditions and requires no external pullup.

Key Specifications

Pinout & Package

The MAX6388XS17D7-T is housed in a RoHS-compliant 4-pin SC70 package (outline 21-0098), footprint-compatible with standard SC70 land pattern 90-0187. Thermal resistance θ_JA is 322.6°C/W on multilayer board.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6387XS17D7-T, the MAX6388XS17D7-T eliminates external pullup components and simplifies PCB layout; compared with MAX6385XS17D7-T, it trades manual reset for dual-supply monitoring - making it optimal for space-constrained dual-rail systems where physical reset buttons are unnecessary.

Availability

MAX6388XS17D7-T is available at Aetrix Electronics and suitable for portable/battery-powered equipment, dual voltage systems, intelligent instruments, and critical μP/μC power monitoring requiring stable component supply and long-term lifecycle support.

Supply support for MAX6388XS17D7-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, with emphasis on low-power, high-reliability solutions.

The MAX6381–MAX6390 family delivers single/dual low-voltage supervisory circuits optimized for battery-powered and thermally constrained systems where minimal quiescent current and guaranteed reset timing are essential.

FAQ

What is the exact reset threshold voltage of the MAX6388XS17D7-T and how accurate is it over temperature?

The MAX6388XS17D7-T has a factory-set VCC reset threshold of 1.67V, with ±2.5% accuracy guaranteed over the full –40°C to +125°C operating temperature range. This specification is confirmed in the Electrical Characteristics table of the official datasheet, ensuring reliable brownout detection without external calibration. The MAX6388XS17D7-T maintains this tolerance across its entire thermal envelope due to internal bandgap trimming.

Does the MAX6388XS17D7-T support monitoring of a second voltage, and how is it implemented?

Yes, the MAX6388XS17D7-T includes a dedicated RESET IN pin that monitors a second voltage using an internal 1.27V reference. To set a custom threshold, connect an external resistor divider between the target supply and ground, with the midpoint fed to RESET IN. The MAX6388XS17D7-T asserts reset if either VCC falls below 1.67V or the voltage at RESET IN drops below 1.27V - enabling true dual-supply supervision in compact 4-pin SC70 form factor.

What is the function of the RESET output on the MAX6388XS17D7-T, and what are its drive capabilities?

The RESET output on the MAX6388XS17D7-T is an active-high push-pull driver, meaning it actively drives logic-high during reset assertion and pulls low when deasserted. It sources up to 800µA at VCC ≥ 4.5V and sinks up to 3.2mA when asserted, with VOL ≤ 0.4V under full load. This eliminates the need for external pullup resistors and ensures robust noise immunity in noisy environments - a key advantage over open-drain alternatives like the MAX6387XS17D7-T.

How does the 1200ms reset timeout of the MAX6388XS17D7-T benefit system reliability?

The 1200ms minimum reset timeout of the MAX6388XS17D7-T ensures the microprocessor remains held in reset long enough for all power rails to stabilize, internal clocks to lock, and peripheral initialization routines to complete - especially critical in systems with slow-ramping LDOs or large bulk capacitance. This timeout is guaranteed over temperature and supply voltage, preventing premature release that could cause boot failures or undefined states in safety-critical applications.

Is the MAX6388XS17D7-T compatible with automotive applications, and what qualifications does it hold?

The MAX6388XS17D7-T is not explicitly automotive-qualified; the datasheet indicates automotive qualification applies only to parts with "/V" suffix (e.g., MAX6388XS17D7/V+T). While the MAX6388XS17D7-T operates across –40°C to +125°C and meets AEC-Q100 requirements *in applicable /V variants*, the base MAX6388XS17D7-T is rated for industrial temperature range and carries RoHS-compliant "+T" packaging. For automotive use, specify the /V version.