Analog Devices Inc./Maxim Integrated MAX6387XS17D3+

Overview

MAX6387XS17D3+ from Maxim Integrated is a low-power microprocessor supervisory circuit with dual-voltage monitoring capability, factory-set 1.67V VCC reset threshold (±2.5% over -40°C to +125°C), 140ms minimum VCC reset timeout, and active-low push-pull RESET output. It monitors both VCC and an auxiliary voltage via RESET IN pin and consumes only 3μA at +1.8V - used in battery-powered instrumentation and dual-rail embedded systems requiring reliable power-up sequencing.

For engineers reviewing the MAX6387XS17D3+ datasheet, MAX6387XS17D3+ pinout, MAX6387XS17D3+ application, or MAX6387XS17D3+ equivalent, key selection criteria include its 1.67V reset threshold accuracy, 140ms timeout, dual-monitoring architecture, SC70-4 package footprint, and guaranteed RESET validity down to VCC = 1V.

Technical Context

The MAX6387XS17D3+ integrates two independent reset comparators: one for fixed-threshold VCC monitoring (1.67V nominal) and another for user-adjustable auxiliary voltage detection via RESET IN referenced to an internal 1.27V bandgap. Its reset assertion logic triggers when either monitored voltage falls below its respective threshold.

It implements a precision monostable timer for reset timeout control, guaranteeing ≥140ms assertion after VCC recovery or RESET IN recovery, with temperature-stable timing (±1.5% typical variation over -40°C to +125°C). The push-pull active-low RESET output drives directly without external pullup and remains valid down to VCC = 1V.

Key Specifications

Pinout & Package

MAX6387XS17D3+ 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 MAX6387LT17D3+, the MAX6387XS17D3+ saves board space in compact portable designs; compared with TPS3808G17DBVR, it eliminates external components and simplifies layout but lacks open-drain flexibility for multi-source reset arbitration.

Availability

MAX6387XS17D3+ is available at Aetrix Electronics and suitable for portable medical sensors, dual-rail industrial controllers, battery-powered data loggers, and automotive body control modules requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MAX6387XS17D3+ 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 industrial, automotive, and computing applications.

The MAX6381–MAX6390 family delivers ultra-low-power, high-accuracy reset supervision for resource-constrained embedded systems where supply stability and deterministic startup behavior are mission-critical.

FAQ

What is the exact reset threshold voltage of MAX6387XS17D3+ and how stable is it over temperature?

The MAX6387XS17D3+ has a factory-set VCC reset threshold of 1.67V, 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 resistive networks and a precision bandgap reference, ensuring consistent brownout detection regardless of ambient conditions. The MAX6387XS17D3+ datasheet specifies this tolerance explicitly in the Electrical Characteristics table under "VCC Reset Threshold".

Does MAX6387XS17D3+ support monitoring of a second voltage rail, and how is it implemented?

Yes, MAX6387XS17D3+ supports dual-voltage monitoring via its dedicated RESET IN pin, which connects to an internal comparator referenced to a stable 1.27V bandgap. To supervise a second rail, apply the target voltage to RESET IN through a resistor divider that scales it to 1.27V at the threshold point. The MAX6387XS17D3+ asserts reset if either VCC drops below 1.67V or the scaled RESET IN voltage falls below 1.27V - enabling coordinated reset across multiple power domains.

What is the function of the RESET output on MAX6387XS17D3+, and what drive capability does it provide?

The RESET output on MAX6387XS17D3+ is an active-low push-pull driver that guarantees valid logic states down to VCC = 1V. It sinks up to 3.2mA at VCC ≥ 4.5V (VOL ≤ 0.4V) and 1.2mA at VCC ≥ 2.5V (VOL ≤ 0.3V), allowing direct interfacing with standard μP reset inputs without external components. Unlike open-drain variants, the MAX6387XS17D3+ RESET output does not require a pullup resistor - simplifying design and improving noise immunity.

Can MAX6387XS17D3+ be used in automotive applications, and what qualifications does it meet?

The MAX6387XS17D3+ is not automotive-qualified; it is rated for -40°C to +125°C operation but lacks AEC-Q100 certification. For automotive use, Maxim offers /V-trim versions (e.g., MAX6387XS17D3/V+) explicitly qualified to AEC-Q100 Grade 2. The MAX6387XS17D3+ itself carries the "+" suffix indicating RoHS compliance only - not automotive qualification. Always verify the full part number suffix against the official Maxim ordering guide before deploying in vehicle systems.

What package type and dimensions does MAX6387XS17D3+ use, and what PCB layout considerations apply?

MAX6387XS17D3+ uses a 4-pin SC70 package (outline 21-0098) measuring 2.0mm × 2.1mm × 0.95mm with a 0.65mm pin pitch. Recommended layout practices include placing a 0.1μF ceramic decoupling capacitor between VCC and GND as close as possible to the device, minimizing trace length to RESET IN for noise immunity, and using thermal relief pads for soldering. The land pattern number is 90-0187, and thermal resistance is θJA = 322.6°C/W on a multilayer board.