Analog Devices Inc./Maxim Integrated MAX6384XS26D4

Overview

MAX6384XS26D4 from Maxim Integrated is a low-power, single-supply microprocessor supervisory circuit with active-low push-pull reset output, factory-set 2.63V reset threshold (±2.5% over –40°C to +125°C), 1120ms minimum VCC reset timeout, and debounced manual reset input (MR). It monitors +1.8V to +5.0V supplies while drawing only 3µA at +1.8V and guarantees valid reset assertion down to VCC = 1V. Used in portable battery-powered equipment for reliable power-on reset and brownout protection.

For engineers reviewing the MAX6384XS26D4 datasheet, MAX6384XS26D4 pinout, MAX6384XS26D4 application, or MAX6384XS26D4 equivalent, key selection considerations include its 2.63V threshold accuracy, 1120ms timeout timing, MR input with internal 63kΩ pullup, SC70-4 package footprint, and compatibility with systems requiring guaranteed reset validity during low-VCC conditions.

Technical Context

The MAX6384XS26D4 integrates a precision voltage comparator with ±2.5% threshold accuracy over full industrial temperature range and an internal timer that enforces a minimum 1120ms reset pulse width after VCC rises above 2.63V. Its MR input features built-in 63kΩ internal pullup and 1µs minimum pulse width requirement, enabling direct connection to momentary switches without external components.

This device uses BiCMOS process technology (647 transistors) and operates across 1.0V–5.5V supply range. Reset output remains valid down to VCC = 1V, and it provides immunity to negative-going VCC transients up to 35µs at 100mV overdrive - critical for noisy or battery-depleted environments.

Key Specifications

Pinout & Package

MAX6384XS26D4 is housed in a lead-free 4-pin SC70 package (X4-1, 1.3mm × 1.1mm × 0.95mm), optimized for space-constrained portable designs. Pin 1 is marked with a dot; pin numbering follows standard SC70 orientation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6326XR26D4 and TPS3808G33DBVR, the MAX6384XS26D4 uniquely combines 2.63V precision threshold, 1120ms timeout, integrated MR pullup, and SC70-4 footprint - making it optimal for compact, manually serviceable embedded systems needing tight brownout detection.

Availability

MAX6384XS26D4 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 guaranteed lead-free compliance.

Supply support for MAX6384XS26D4 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 U.S.-based semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, automotive, and communications markets.

The MAX6381–MAX6390 family was designed specifically for ultra-low-power, precision voltage supervision in space- and energy-constrained embedded systems - emphasizing threshold accuracy, timing consistency, and robustness in harsh electrical environments.

FAQ

What is the exact reset threshold voltage of the MAX6384XS26D4?

The MAX6384XS26D4 has a factory-set reset threshold of 2.63V, with guaranteed accuracy of ±2.5% over the full operating temperature range (–40°C to +125°C). This value is laser-trimmed during production and does not require external adjustment. The "26" suffix in MAX6384XS26D4 explicitly denotes the 2.63V threshold per Maxim's ordering nomenclature.

Does the MAX6384XS26D4 require an external pullup resistor on the RESET pin?

No, the MAX6384XS26D4 features an active-low push-pull RESET output, which actively drives both high and low states. Unlike open-drain variants, it does not require an external pullup resistor - simplifying design and reducing BOM count. The output sinks ≥1.2mA at VCC ≥2.5V and sources sufficient current to drive standard CMOS reset inputs.

How does the manual reset (MR) input function on the MAX6384XS26D4?

The MR input on the MAX6384XS26D4 is active-low and includes a built-in 63kΩ pullup resistor to VCC. Driving MR low forces an immediate reset assertion, which remains active for the full 1120ms timeout after MR is released. It accepts TTL/CMOS logic levels and supports direct connection to a momentary switch tied to GND - no external debounce components are needed.

What package type and dimensions does the MAX6384XS26D4 use?

The MAX6384XS26D4 is packaged in a lead-free 4-pin SC70 (X4-1) case measuring 1.3mm × 1.1mm × 0.95mm. Pin 1 is marked with a dot; the pinout is VCC (1), RESET (2), MR (3), GND (4). This ultra-small outline enables placement in dense wearable and portable PCB layouts where space is at a premium.

Can the MAX6384XS26D4 operate reliably during severe supply voltage sags?

Yes - the MAX6384XS26D4 guarantees correct reset output logic state down to VCC = 1.0V, and its internal comparator remains functional across the full 1.0V–5.5V operating range. This ensures deterministic reset assertion even during deep brownout events common in battery-powered systems, preventing undefined MCU behavior or memory corruption.