Analog Devices Inc./Maxim Integrated MAX6388XS31D5-T

Overview

MAX6388XS31D5-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), 280ms 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 MAX6388XS31D5-T datasheet, MAX6388XS31D5-T pinout, MAX6388XS31D5-T application, or MAX6388XS31D5-T equivalent, key selection criteria include its 3.08V threshold accuracy, 280ms VCC reset timeout, 4-pin SC70 package, RESET IN comparator compatibility with external resistor dividers, and guaranteed reset validity down to VCC = 1V.

Technical Context

The MAX6388XS31D5-T integrates a precision voltage comparator monitoring VCC against a fixed 3.08V threshold and a separate high-impedance RESET IN input referenced to an internal +1.27V bandgap. Reset assertion occurs when either voltage falls below its respective threshold, with independent timing control via a monolithic timer delivering 280ms minimum timeout after recovery.

Its active-high push-pull RESET output drives high during fault conditions and deasserts cleanly upon recovery, eliminating need for external pullup resistors. The device guarantees correct logic state down to VCC = 1V and provides immunity to negative-going VCC transients up to 100mV overdrive for durations under ~10µs, as verified in typical operating characteristics graphs.

Key Specifications

Pinout & Package

MAX6388XS31D5-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 space-constrained PCB layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6388XS31D5-T, MAX6388XS31D3-T offers reduced reset duration for rapid-boot systems, while TLV803EC30DBZR trades dual-supply capability for improved threshold accuracy and smaller 3-pin footprint-both require layout review due to differing pin counts and missing RESET IN functionality.

Availability

MAX6388XS31D5-T is available at Aetrix Electronics and suitable for industrial PLC controllers, automotive body control modules, medical wearable sensor hubs, and smart energy meters requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MAX6388XS31D5-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, mixed-signal, and power management ICs for demanding industrial, automotive, and medical applications.

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.

FAQ

What is the exact reset threshold voltage of MAX6388XS31D5-T and how stable is it over temperature?

The MAX6388XS31D5-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 internal resistors and a precision bandgap reference, ensuring consistent brownout detection without external calibration. The MAX6388XS31D5-T maintains this specification across all production lots and environmental conditions specified in the datasheet.

Does MAX6388XS31D5-T support monitoring of two independent power rails?

Yes, MAX6388XS31D5-T supports dual-rail monitoring: its primary VCC pin monitors the main supply at 3.08V, while the dedicated RESET IN pin compares an external voltage to an internal +1.27V reference. By connecting a resistor divider to RESET IN, users can configure a second threshold-for example, 5.0V or 1.8V-enabling simultaneous supervision of core and I/O supplies. The MAX6388XS31D5-T asserts reset if either rail falls below its respective threshold.

What is the function of the RESET output on MAX6388XS31D5-T and how does it interface with a microprocessor?

The RESET output of MAX6388XS31D5-T is an active-high push-pull driver, meaning it outputs a logic high during reset assertion and logic low otherwise. This eliminates the need for an external pullup resistor and allows direct connection to standard μP reset inputs that expect active-high signaling. The MAX6388XS31D5-T guarantees valid logic levels down to VCC = 1V, ensuring robust interface behavior even during deep undervoltage events.

What is the minimum reset timeout period for MAX6388XS31D5-T and why is it important?

The MAX6388XS31D5-T provides a minimum reset timeout period of 280ms after VCC rises above the 3.08V threshold. This duration ensures the microprocessor remains held in reset long enough for all internal circuits-including PLLs, memory arrays, and I/O peripherals-to fully stabilize before code execution resumes. The MAX6388XS31D5-T's guaranteed 280ms timeout prevents premature release that could cause erratic boot behavior or data corruption in complex embedded systems.

Can MAX6388XS31D5-T operate reliably at very low supply voltages?

Yes, MAX6388XS31D5-T is fully specified to operate down to VCC = 1.0V, with guaranteed reset output validity across this entire range. Its internal comparators and timer remain functional, and the active-high push-pull RESET output maintains correct logic states even at 1V supply. This capability makes the MAX6388XS31D5-T suitable for fail-safe shutdown sequences in battery-powered devices where supply collapse must trigger controlled reset before complete power loss.