Analog Devices Inc./Maxim Integrated MAX6388XS20D1-T

Overview

MAX6388XS20D1-T from Maxim Integrated is a low-power microprocessor supervisory circuit with active-high push-pull reset output, factory-set 2.0V reset threshold (±2.5% over -40°C to +125°C), 1ms 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 battery-powered embedded systems requiring reliable power-on reset and brownout detection.

For engineers reviewing the MAX6388XS20D1-T datasheet, MAX6388XS20D1-T pinout, MAX6388XS20D1-T application, or MAX6388XS20D1-T equivalent, key selection criteria include its 2.0V VTH accuracy, 1ms tRP timing, 4-pin SC70 package footprint, dual-supply monitoring capability via RESET IN, and guaranteed reset validity down to VCC = 1V.

Technical Context

The MAX6388XS20D1-T integrates a precision voltage comparator for VCC monitoring and a separate +1.27V reference-based comparator for the auxiliary RESET IN input, enabling independent reset assertion when either supply falls below its threshold. Its internal timer guarantees a minimum 1ms reset pulse width after VCC or RESET IN recovers.

This device uses BiCMOS process technology to achieve 3μA supply current at 1.8V while maintaining ±2.5% reset threshold accuracy across -40°C to +125°C and supporting operation down to VCC = 1V with valid logic-level reset output.

Key Specifications

Pinout & Package

MAX6388XS20D1-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 portable designs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6387XS20D1-T, MAX6388XS20D1-T eliminates external pullup and simplifies interface; versus TLV809E20DBZR, it adds dual-rail supervision and offers 1ms timing critical for fast-boot MCUs - making it optimal for compact, multi-rail embedded systems.

Availability

MAX6388XS20D1-T is available at Aetrix Electronics and suitable for portable medical sensors, battery-powered industrial controllers, automotive body control modules, and dual-rail microcontroller systems requiring stable component supply and long-term lifecycle support.

Supply support for MAX6388XS20D1-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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, automotive, and communications applications.

The MAX6381–MAX6390 family was designed specifically for ultra-low-power, precision voltage supervision in space- and energy-constrained embedded systems, with emphasis on wide temperature operation and dual-rail flexibility.

FAQ

What is the exact reset threshold voltage of the MAX6388XS20D1-T and how stable is it over temperature?

The MAX6388XS20D1-T has a factory-set nominal reset threshold of 2.00V, with guaranteed accuracy of ±2.5% over the full operating temperature range of -40°C to +125°C. This stability is achieved through laser-trimmed internal resistors and a precision bandgap reference, eliminating the need for external calibration. The device maintains this specification without derating, making it suitable for automotive under-hood and industrial control applications where thermal drift must be minimized.

Does the MAX6388XS20D1-T require an external pullup resistor on its RESET pin?

No, the MAX6388XS20D1-T features an active-high push-pull RESET output, which actively drives both high and low states without requiring an external pullup resistor. This simplifies PCB layout, reduces BOM count, and ensures robust noise immunity in high-impedance systems. Unlike open-drain alternatives such as MAX6387XS20D1-T, the MAX6388XS20D1-T's push-pull architecture delivers full rail-to-rail swing and can directly interface with standard CMOS inputs.

Can the MAX6388XS20D1-T monitor two different supply voltages simultaneously?

Yes, the MAX6388XS20D1-T supports dual-voltage supervision: VCC is monitored against its 2.0V factory-set threshold, while the 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, independently adjustable reset threshold - for example, setting a 3.3V rail to trigger at 3.0V. This eliminates the need for a second supervisor IC in systems with multiple power domains.

What is the minimum supply voltage at which the MAX6388XS20D1-T guarantees valid RESET output logic levels?

The MAX6388XS20D1-T guarantees correct RESET output logic state (high during reset, low otherwise) down to VCC = 1.0V. This is critical for applications experiencing deep brownout conditions, such as battery-powered devices nearing end-of-life. Below 1.0V, the internal circuitry may not maintain defined output behavior - so system designers should ensure that any downstream logic interpreting RESET remains functional at or above 1.0V.

How does the MAX6388XS20D1-T handle short-duration voltage transients on the VCC line?

The MAX6388XS20D1-T provides built-in immunity to negative-going VCC transients, rejecting pulses ≤35μs wide when the overdrive (VTH – VCC) is 100mV. This is specified in the "Maximum Transient Duration vs. Reset Comparator Overdrive" graph in the datasheet. For enhanced protection, Maxim recommends placing a 0.1μF ceramic capacitor as close as possible to the VCC pin - a practice that further suppresses high-frequency noise and improves system reliability in electrically harsh environments.