Analog Devices Inc./Maxim Integrated MAX6388XS45D1

Overview

MAX6388XS45D1 from Maxim Integrated is a low-power, single-supply microprocessor supervisory circuit with active-high push-pull reset output, factory-set 4.50V reset threshold (±2.5% over -40°C to +125°C), 140ms minimum reset timeout, and auxiliary RESET IN input for dual-voltage monitoring in portable power management systems.

For engineers reviewing the MAX6388XS45D1 datasheet, MAX6388XS45D1 pinout, MAX6388XS45D1 application, or MAX6388XS45D1 equivalent, this page delivers verified electrical parameters, SC70-4 package mapping, reset timing behavior under VCC brownout and manual assertion, and validated alternatives for voltage supervisor selection in battery-powered embedded controllers.

Technical Context

The MAX6388XS45D1 integrates a precision bandgap reference and comparator to monitor VCC against a fixed 4.50V threshold while simultaneously accepting an external voltage via RESET IN for secondary supply supervision. Its internal timer guarantees 140ms minimum reset assertion after VCC recovery or RESET IN release.

This device uses BiCMOS process technology, supports operation down to VCC = 1.0V with guaranteed reset logic state, and features negative-going VCC transient immunity up to 35µs at 100mV overdrive - critical for noisy DC-DC converter outputs in handheld instrumentation.

Key Specifications

Pinout & Package

MAX6388XS45D1 is housed in a lead-free 4-pin SC70 package (X4-1), measuring 1.0mm × 1.0mm × 0.55mm, 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 MAX6388LT45D1, the MAX6388XS45D1 offers identical supervision performance in a 30% smaller footprint ideal for compact portable devices; versus TLV809E45DBZR, it adds critical dual-rail monitoring capability at the expense of one extra pin and slightly higher unit cost.

Availability

MAX6388XS45D1 is available at Aetrix Electronics and suitable for portable medical sensors, battery-powered IoT nodes, industrial handheld terminals, and dual-voltage microcontroller systems requiring stable component supply with guaranteed long-term availability.

Supply support for MAX6388XS45D1 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 power management, sensing, and interface applications in industrial, automotive, and consumer markets.

The MAX6381–MAX6390 family delivers ultra-low-power, factory-trimmed voltage supervisors optimized for battery-critical and space-constrained embedded systems requiring dual-rail monitoring and guaranteed reset behavior across extreme temperatures.

FAQ

What is the exact reset threshold voltage of MAX6388XS45D1 and how stable is it over temperature?

The MAX6388XS45D1 has a factory-set nominal reset threshold of 4.50V with ±2.5% accuracy 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, ensuring consistent brownout detection without external calibration. The MAX6388XS45D1 maintains this specification across all production units per Maxim's datasheet Electrical Characteristics table.

Does MAX6388XS45D1 support monitoring of a second voltage rail, and how is it implemented?

Yes, the MAX6388XS45D1 supports dual-voltage monitoring via its dedicated RESET IN pin, which compares an external voltage to an internal 1.27V reference. To set a custom threshold, connect RESET IN to the center tap of a resistor divider between VCC and GND. The MAX6388XS45D1 asserts reset if either VCC falls below 4.50V or the voltage at RESET IN drops below 1.27V - enabling coordinated supervision of core and I/O rails.

What is the function of the RESET output on MAX6388XS45D1, and what drive capability does it provide?

The RESET output of the MAX6388XS45D1 is an active-high push-pull driver that transitions high during reset assertion and low when deasserted. It sources up to 800µA and sinks up to 3.2mA while maintaining VOH ≥ 0.8×VCC and VOL ≤ 0.4V, eliminating the need for an external pull-up resistor. This configuration ensures clean, fast reset signaling directly compatible with standard µP reset inputs without additional components.

How long does the reset signal remain asserted after VCC recovers above the threshold in MAX6388XS45D1?

The MAX6388XS45D1 guarantees a minimum reset timeout period of 140ms after VCC rises above the 4.50V threshold. This interval is generated by an internal RC timer and remains stable across temperature and supply voltage variations, as confirmed in the datasheet's Reset Timeout Period table (suffix D3). The MAX6388XS45D1 ensures this hold time is met before releasing the reset signal to prevent premature µP execution.

What package type and dimensions does MAX6388XS45D1 use, and is it RoHS-compliant?

The MAX6388XS45D1 is packaged in a lead-free 4-pin SC70 (X4-1) package measuring 1.0mm × 1.0mm × 0.55mm with a 0.65mm pin pitch. It complies with RoHS Directive 2011/65/EU and is marked with a "+" symbol in Maxim's ordering information to denote lead-free construction. The MAX6388XS45D1's compact footprint supports high-density layouts in portable electronics while maintaining thermal performance within specified limits.