Analog Devices Inc./Maxim Integrated MAX6384XS31D5+

Overview

MAX6384XS31D5+ from Maxim Integrated is a low-power microprocessor supervisory circuit with active-low push-pull reset output, factory-set 3.08V reset threshold (±2.5% over -40°C to +125°C), 280ms minimum VCC reset timeout, and debounced manual reset input. It monitors single-supply systems in portable electronics, battery-powered instrumentation, and industrial controllers where reliable power-on reset and brownout protection are critical.

For engineers reviewing the MAX6384XS31D5+ datasheet, MAX6384XS31D5+ pinout, MAX6384XS31D5+ application, or MAX6384XS31D5+ equivalent, key selection considerations include its 4-pin SC70 package, 3µA supply current at 1.8V, guaranteed reset validity down to VCC = 1V, and internal MR pullup resistor (63kΩ).

Technical Context

The MAX6384XS31D5+ integrates a precision voltage comparator with ±2.5% threshold accuracy across -40°C to +125°C and a temperature-stable internal timer delivering 280ms minimum reset assertion after VCC recovery. Its active-low push-pull RESET output drives directly into µP reset inputs without external pullup.

It features a debounced manual reset input (MR) with internal 63kΩ pullup to VCC, supporting TTL/CMOS-compatible logic levels and requiring no external debounce circuitry. The device operates from 1.0V to 5.5V supply and guarantees correct RESET state down to VCC = 1V.

Key Specifications

Pinout & Package

MAX6384XS31D5+ is housed in a lead-free 4-pin SC70 package (package code X4-1), measuring 1.5mm × 1.0mm × 0.8mm, 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 MAX6384XS31D5+, MAX6326XR31D5+ saves one pin but removes field-serviceability via MR, while TPS3123E18DBVR introduces BOM overhead and timing margin reduction - making MAX6384XS31D5+ optimal for compact, manually serviceable 3.3V systems.

Availability

MAX6384XS31D5+ is available at Aetrix Electronics and suitable for portable medical sensors, industrial PLC I/O modules, and automotive body control units requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for MAX6384XS31D5+ 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 demanding industrial, automotive, and computing applications, emphasizing low power, high reliability, and small form factor.

The MAX6381–MAX6390 family delivers single/dual low-voltage supervisory circuits targeting battery-powered and space-constrained systems where deterministic reset behavior and minimal quiescent current are essential.

FAQ

What is the exact reset threshold voltage of MAX6384XS31D5+ and how is it specified?

The MAX6384XS31D5+ has a factory-set nominal reset threshold of 3.08V, with guaranteed tolerance of ±2.5% over the full operating temperature range (-40°C to +125°C). This value is defined by the "31" suffix per Maxim's Reset Threshold table and applies specifically to the VCC monitor path - not the MR or auxiliary inputs. The MAX6384XS31D5+ uses this fixed threshold to detect brownout conditions on its VCC pin.

Does MAX6384XS31D5+ require an external pullup resistor on the RESET pin?

No, MAX6384XS31D5+ does not require an external pullup resistor on the RESET pin because it features an active-low push-pull output configuration. The internal driver actively pulls RESET low during assertion and drives it high during deassertion, eliminating reliance on external passive components. This design simplifies layout and improves noise immunity compared to open-drain alternatives.

What is the function and electrical behavior of the MR pin on MAX6384XS31D5+?

The MR pin on MAX6384XS31D5+ is an active-low manual reset input with an internal 63kΩ pullup resistor to VCC. Driving MR low forces immediate reset assertion, which persists for the full 280ms timeout after MR is released. The pin accepts standard TTL/CMOS logic levels and requires no external debounce circuitry due to built-in filtering - enabling direct connection to a momentary switch tied to GND.

Can MAX6384XS31D5+ operate reliably during deep brownout conditions?

Yes, MAX6384XS31D5+ guarantees valid RESET output state down to VCC = 1.0V, as confirmed in its Absolute Maximum Ratings and Electrical Characteristics tables. This ensures deterministic reset behavior even during severe supply sags - critical for preventing MCU lockup or memory corruption in battery-powered systems where VCC may dip below 2.0V before shutdown.

What package type and dimensions does MAX6384XS31D5+ use?

MAX6384XS31D5+ is packaged in a lead-free 4-pin SC70 (package code X4-1), with footprint dimensions of 1.5mm × 1.0mm and height of 0.8mm. This ultra-compact outline is optimized for high-density PCBs in portable and wearable electronics. Pin 1 is marked by a dot or beveled edge, and the package complies with JEDEC MO-203-AB standards.