Analog Devices Inc./Maxim Integrated MAX6384XS42D2+

Overview

MAX6384XS42D2+ from Maxim Integrated is a low-power microprocessor supervisory circuit with factory-set 4.20V reset threshold, 20ms minimum reset timeout, active-low push-pull reset output, and debounced manual reset input (MR). It monitors +1.8V to +5.0V supply rails in battery-powered embedded controllers and ensures reliable power-on reset sequencing for critical µP systems.

For engineers reviewing the MAX6384XS42D2+ datasheet, MAX6384XS42D2+ pinout, MAX6384XS42D2+ application, or MAX6384XS42D2+ equivalent, key selection factors include its ±2.5% reset threshold accuracy over -40°C to +125°C, guaranteed valid reset output down to VCC = 1V, 3µA supply current at +1.8V, and SC70-4 package compatibility with space-constrained portable designs.

Technical Context

The MAX6384XS42D2+ integrates a precision voltage comparator with internal 4.20V reference and a temperature-stable reset timer. Its MR input features a 63kΩ internal pullup resistor and supports TTL/CMOS logic levels, enabling direct connection to momentary switches without external debounce components.

Reset assertion occurs when VCC falls below 4.20V (±2.5% over temperature), and the active-low push-pull output remains asserted for ≥20ms after VCC rises above threshold. The device guarantees correct logic state down to VCC = 1V and provides immunity to negative-going VCC transients up to 35µs at 100mV overdrive.

Key Specifications

Pinout & Package

MAX6384XS42D2+ uses a 4-pin SC70 package (X4-1) with 0.65mm pitch, measuring 1.3mm × 1.1mm × 0.6mm. Pin 1 is marked with a dot; pin numbering follows standard SC70 convention (counterclockwise from mark).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX809S+T and TPS3808G12DBVR, the MAX6384XS42D2+ uniquely combines precise 4.20V threshold, 20ms timeout, MR functionality, and ultra-low 3µA ICC in a 4-pin SC70 - making it optimal for compact, battery-sensitive systems requiring deterministic reset timing and user-initiated recovery.

Availability

MAX6384XS42D2+ is available at Aetrix Electronics and suitable for portable medical sensors, industrial PLC I/O modules, smart home hub controllers, and automotive body control modules requiring stable component supply and long-term production continuity.

Supply support for MAX6384XS42D2+ 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, with emphasis on power efficiency and reliability.

The MAX6381–MAX6390 family delivers single/dual low-voltage µP reset circuits optimized for battery-powered and space-constrained systems where accurate voltage monitoring and minimal quiescent current are critical design requirements.

FAQ

What is the exact reset threshold voltage of the MAX6384XS42D2+?

The MAX6384XS42D2+ has a factory-set nominal reset threshold of 4.20V, with guaranteed tolerance of ±2.5% over the full operating temperature range (-40°C to +125°C). This value is confirmed in the Reset Thresholds table of the datasheet and applies specifically to the "42" suffix in the MAX6384XS42D2+ part number.

Does the MAX6384XS42D2+ require external components for manual reset functionality?

No, the MAX6384XS42D2+ includes an internal 63kΩ pullup resistor on the MR pin, allowing direct connection of a momentary switch between MR and GND without external components. This integrated debounce eliminates the need for RC networks or Schmitt triggers, simplifying design and reducing BOM count.

What is the minimum VCC voltage at which the MAX6384XS42D2+ guarantees correct reset output logic state?

The MAX6384XS42D2+ guarantees valid reset output logic state down to VCC = 1.0V. Below this voltage, the internal circuitry may not maintain correct output behavior. This specification ensures reliable reset assertion during deep brownout conditions before complete power collapse.

Can the MAX6384XS42D2+ be used in applications requiring a 3.3V supply rail supervision?

Yes, the MAX6384XS42D2+ is rated for operation from +1.0V to +5.5V and monitors VCC directly. With its 4.20V reset threshold, it is specifically suited for supervising 4.5V or 5.0V rails. For 3.3V rails, a different threshold variant (e.g., MAX6384XS33D2+) would be required - the MAX6384XS42D2+ itself is not appropriate for 3.3V supervision due to threshold mismatch.

What package type and dimensions does the MAX6384XS42D2+ use?

The MAX6384XS42D2+ uses a 4-pin SC70 package (pkg code X4-1), measuring 1.3mm × 1.1mm × 0.6mm with 0.65mm lead pitch. This ultra-compact outline is documented in Maxim's package drawing 21-0098 and is compatible with standard SC70 assembly processes.