Analog Devices Inc./Maxim Integrated MAX6388XS29D1

Overview

MAX6388XS29D1 from Maxim Integrated is a low-power, single-supply microprocessor supervisory circuit with active-high push-pull reset output, factory-set 2.93V 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, serving in battery-powered embedded controllers and portable instrumentation.

For engineers reviewing the MAX6388XS29D1 datasheet, MAX6388XS29D1 pinout, MAX6388XS29D1 application, or MAX6388XS29D1 equivalent, key selection considerations include its 2.93V reset threshold accuracy, 140ms VCC reset timeout, 4-pin SC70 package, RESET IN comparator referenced to +1.27V, and guaranteed valid reset output down to VCC = 1V.

Technical Context

The MAX6388XS29D1 integrates a precision voltage comparator monitoring VCC against a factory-trimmed 2.93V threshold and a second comparator monitoring the RESET IN pin against an internal +1.27V reference. It uses a temperature-stable RC timer to guarantee ≥140ms reset assertion after VCC recovery.

This device implements an active-high push-pull RESET output that transitions high upon VCC or RESET IN undervoltage detection and remains asserted for the full timeout period. Its RESET IN input supports user-configurable secondary voltage monitoring via external resistor divider, enabling dual-rail power supervision in systems with core and I/O supplies.

Key Specifications

Pinout & Package

MAX6388XS29D1 is housed in a lead-free 4-pin SC70 package (package code X4-1), measuring 1.0mm × 1.0mm × 0.5mm, optimized for space-constrained portable designs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6388XS29D1, the MAX6388LT29D3 offers superior thermal handling in compact µDFN form, while the TLV803EB29DBZR trades dual-rail capability and tighter threshold tolerance for lower cost and smaller 3-pin footprint - making each optimal for distinct system-level trade-offs.

Availability

MAX6388XS29D1 is available at Aetrix Electronics and suitable for portable medical sensors, industrial PLC I/O modules, smart energy meters, and automotive body control modules requiring stable component supply, long-term lifecycle support, and guaranteed lead-free compliance.

Supply support for MAX6388XS29D1 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 ICs for industrial, communications, computing, and consumer applications.

The MAX6381–MAX6390 family was designed specifically for ultra-low-power, precision voltage supervision in space- and battery-constrained embedded systems, emphasizing factory-trimmed accuracy, wide temperature operation, and dual-rail monitoring capability.

FAQ

What is the exact reset threshold voltage of MAX6388XS29D1 and how stable is it over temperature?

The MAX6388XS29D1 has a factory-set VCC reset threshold of 2.93V, specified with ±2.5% tolerance over the full industrial temperature range of –40°C to +125°C. This stability is achieved through laser trimming and BiCMOS process design, ensuring consistent brownout detection without external calibration. The MAX6388XS29D1 also exhibits a low tempco of 60ppm/°C, minimizing drift across operating conditions.

Does MAX6388XS29D1 support monitoring of a second voltage rail, and how is it implemented?

Yes, MAX6388XS29D1 supports dual-rail supervision via its dedicated RESET IN pin, which connects to an internal comparator referenced to +1.27V. To monitor a secondary voltage (e.g., 1.2V or 1.8V), a resistor divider scales the rail to match the +1.27V threshold. Reset asserts if either VCC falls below 2.93V or the scaled RESET IN voltage drops below +1.27V - enabling coordinated reset of multiple power domains in the MAX6388XS29D1.

What is the function of the RESET output on MAX6388XS29D1, and what load can it drive?

The RESET output of MAX6388XS29D1 is an active-high push-pull driver capable of sourcing 800µA at VCC ≥ 4.5V and sinking 3.2mA when asserted. It directly interfaces with standard µP reset inputs without external pull resistors. The output remains valid down to VCC = 1V, ensuring deterministic behavior during deep brownout - a key reliability feature of the MAX6388XS29D1 in mission-critical applications.

How does MAX6388XS29D1 handle short negative-going transients on the VCC line?

MAX6388XS29D1 incorporates glitch immunity circuitry that suppresses reset assertion for negative-going VCC transients shorter than ~35µs (at 100mV overdrive), as characterized in the "Maximum Transient Duration vs. Reset Comparator Overdrive" graph. This prevents spurious resets caused by switching noise or ESD-induced dips. Adding a 0.1µF ceramic capacitor close to the VCC pin further enhances immunity - a recommended practice for robust MAX6388XS29D1 deployment.

What package options are available for MAX6388XS29D1, and what are their key mechanical differences?

MAX6388XS29D1 is offered exclusively in the 4-pin SC70 package (X4-1), measuring 1.0mm × 1.0mm × 0.5mm with gull-wing leads. Unlike the 6-pin µDFN variants (e.g., MAX6388LT29D3), the SC70 version simplifies PCB layout with accessible pins for rework and optical inspection. Its lead-free construction complies with RoHS, and the small footprint makes it ideal for wearables and handheld devices where board area is constrained - a defining characteristic of the MAX6388XS29D1.