Analog Devices Inc./Maxim Integrated MAX6390XS26D7

Overview

MAX6390XS26D7 from Maxim Integrated is a low-power microprocessor supervisory circuit with open-drain active-low reset output, factory-set 2.63V reset threshold (±2.5% over -40°C to +125°C), 1200ms VCC reset timeout, and 150ms manual reset timeout. It monitors single supply voltage in space-constrained embedded systems requiring reliable power-on reset and brownout protection.

For engineers reviewing the MAX6390XS26D7 datasheet, MAX6390XS26D7 pinout, MAX6390XS26D7 application, or MAX6390XS26D7 equivalent, this page delivers verified electrical parameters, SC70-4 package mapping, manual reset timing behavior, and direct alternatives for industrial control, portable instrumentation, and battery-powered MCU systems.

Technical Context

The MAX6390XS26D7 implements a precision bandgap-based reset comparator with ±2.5% threshold accuracy across full temperature range and guarantees valid reset assertion down to VCC = 1.0V. Its internal timer provides fixed 1200ms minimum timeout after VCC recovery and separate 150ms timeout after MR release.

It features an internal 1.56kΩ pullup resistor on MR input-distinctly lower than the 63kΩ used in MAX6384–MAX6386-enabling faster MR signal decay and tighter noise immunity in high-EMI environments. The open-drain RESET output requires external pullup and supports mixed-voltage interface compatibility.

Key Specifications

Pinout & Package

MAX6390XS26D7 is housed in a lead-free 4-pin SC70 package (X4-1), measuring 1.5mm × 1.0mm × 0.8mm, suitable for ultra-dense PCB layouts and reflow-compatible assembly.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6390XS26D7, MAX6326XR26D3+ lacks MR and offers shorter timeout, limiting diagnostic utility; TPS3808G33DBVR shifts threshold upward and changes package, requiring layout revision and recalculating supply margin - MAX6390XS26D7 remains optimal for 2.6V–2.7V rail supervision with integrated manual reset.

Availability

MAX6390XS26D7 is available at Aetrix Electronics and suitable for industrial control systems, portable medical devices, smart energy meters, and automotive body electronics requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MAX6390XS26D7 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 was engineered specifically for space-constrained microprocessor-based systems needing guaranteed reset behavior across wide voltage and temperature ranges - MAX6390XS26D7 delivers the highest VCC timeout and fastest MR response in the series.

FAQ

What is the exact reset threshold voltage of MAX6390XS26D7 and how stable is it over temperature?

The MAX6390XS26D7 has a factory-set reset threshold of 2.63V with ±2.5% accuracy over the full operating range of -40°C to +125°C. This stability is achieved via laser-trimmed bandgap reference and low-tempco design, ensuring consistent trip point across automotive and industrial environments without external calibration. The MAX6390XS26D7 maintains this specification under all load and supply conditions specified in the datasheet.

Does MAX6390XS26D7 support manual reset, and what is its timing behavior?

Yes, MAX6390XS26D7 includes an active-low manual reset (MR) input with internal 1.56kΩ pullup. When MR is pulled low, reset asserts immediately and remains active for a guaranteed minimum of 150ms after MR returns high. This shorter timeout - distinct from the 1200ms VCC timeout - enables responsive user-triggered restarts without disrupting full power-up sequences. The MAX6390XS26D7's MR timing is fully characterized and production-tested.

What package type and pin count does MAX6390XS26D7 use, and is it RoHS-compliant?

MAX6390XS26D7 uses a lead-free 4-pin SC70 package (package code X4-1), measuring 1.5mm × 1.0mm × 0.8mm with gull-wing leads. It is RoHS-compliant and compatible with standard reflow soldering profiles. The pinout - VCC, RESET, MR, GND - matches industry-standard 4-pin supervisory IC footprints, enabling mechanical and thermal drop-in replacement. All MAX6390XS26D7 units supplied by Aetrix Electronics carry full compliance documentation.

Can MAX6390XS26D7 operate reliably at very low supply voltages?

Yes, MAX6390XS26D7 guarantees correct reset output state down to VCC = 1.0V, making it suitable for deep brownout detection in battery-powered systems nearing end-of-life. Its internal comparator and timer remain functional across the full 1.0V to 5.5V operating range, and the open-drain RESET output maintains valid logic levels even at 1.0V supply. This behavior is validated per the MAX6390XS26D7 datasheet Electrical Characteristics table.

How does the open-drain RESET output of MAX6390XS26D7 differ from push-pull versions in the same family?

The MAX6390XS26D7 features an open-drain active-low RESET output, requiring an external pullup resistor to the target logic rail (e.g., 1.8V, 3.3V, or 5V). This enables level-shifting, wired-OR reset bus configurations, and compatibility with mixed-voltage systems - unlike push-pull variants which drive both high and low internally. The MAX6390XS26D7's VOL is specified at 0.3V with 80µA sink current, ensuring solid low-state margin across all supported VCC levels.