Analog Devices Inc./Maxim Integrated MAX6383XR26D7

Overview

MAX6383XR26D7 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 minimum reset timeout, and 3µA supply current at +1.8V. It monitors single-supply VCC in portable/battery-powered equipment, critical µP systems, and dual-voltage applications where reliable power-on reset and brownout detection are required.

For engineers reviewing the MAX6383XR26D7 datasheet, MAX6383XR26D7 pinout, MAX6383XR26D7 application, or MAX6383XR26D7 equivalent, key selection criteria include its open-drain reset architecture, guaranteed valid output down to VCC = 1V, negative-going transient immunity, and compatibility with SC70-3 packaging for space-constrained designs.

Technical Context

The MAX6383XR26D7 implements a precision bandgap-based reset comparator with ±2.5% threshold accuracy across -40°C to +125°C and 60ppm/°C tempco. Its internal timer guarantees a minimum 1200ms reset assertion after VCC rises above 2.63V, with power-down reset delay under 35µs.

This variant belongs to the MAX6381–MAX6390 family's open-drain active-low subgroup (shared with MAX6386/MAX6389/MAX6390) and excludes manual reset input (MR) and auxiliary RESET IN functionality-confirmed by pin configuration and selector guide.

Key Specifications

Pinout & Package

MAX6383XR26D7 is packaged in a 3-pin SC70 (X3-2) package with exposed pad option not specified. Pin 1 = RESET (open-drain active-low), Pin 2 = VCC, Pin 3 = GND.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6326XR26D7+, MAX6383XR26D7 offers wired-OR capability via open-drain output; versus TPS3808G125DBVR, it trades 1.6µA lower ICC for broader legacy design compatibility and established qualification history in automotive subsystems.

Availability

MAX6383XR26D7 is available at Aetrix Electronics and suitable for portable medical sensors, industrial PLC I/O modules, automotive body control units, and smart home hub power management requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MAX6383XR26D7 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, sensing, and connectivity applications in industrial, automotive, and computing markets.

The MAX6381–MAX6390 family was engineered specifically for low-voltage, low-power microprocessor supervision-emphasizing ultra-low ICC, wide VCC range, and robust reset timing across harsh thermal environments.

FAQ

What is the exact reset threshold voltage of the MAX6383XR26D7?

The MAX6383XR26D7 has a factory-set nominal reset threshold of 2.63V, 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, where suffix "26" corresponds to VTH(nom) = 2.63V. The device uses an internal bandgap reference and laser-trimmed resistors to achieve this accuracy without external components.

Does the MAX6383XR26D7 include a manual reset input (MR)?

No, the MAX6383XR26D7 does not include a manual reset input. According to the Selector Guide and Pin Description sections, MR functionality is exclusive to MAX6384/MAX6385/MAX6386/MAX6390 variants. The MAX6383XR26D7 has only three pins: RESET (open-drain), VCC, and GND-leaving no terminal for MR. This simplifies layout but requires external circuitry if system-level manual reset is needed.

What package type and dimensions does the MAX6383XR26D7 use?

The MAX6383XR26D7 uses the 3-pin SC70 package (package code X3-2), measuring 1.25mm × 0.85mm with 0.65mm pitch. Its top-marking includes "XR26D7" and it is RoHS-compliant and lead-free. This package is distinct from the 6-pin µDFN option (L611-1) used by the LT-suffixed variants, and is optimized for high-density portable designs where minimal footprint is critical.

Can the MAX6383XR26D7 operate reliably below 1.8V supply voltage?

Yes, the MAX6383XR26D7 operates from 1.0V to 5.5V and guarantees valid reset output state down to VCC = 1.0V. Electrical Characteristics confirm operation at 1.0V with VOL ≤ 0.3V at 80µA sink current. However, supply current increases slightly below 1.8V (typical ICC = 4µA at 1.0V), and reset timeout accuracy may degrade marginally outside the 1.8V–5.5V range where full characterization is specified.

How does the open-drain output of the MAX6383XR26D7 affect system-level reset bus design?

As an open-drain active-low device, the MAX6383XR26D7 requires an external pull-up resistor to the target reset voltage rail (e.g., 3.3V or 5V). This enables wired-OR configuration with other open-drain reset sources on the same bus-essential in systems with multiple supervisors or FPGA/CPLD-configurable reset generators. The pull-up value (typically 4.7kΩ–10kΩ) must balance rise time against power consumption, especially in battery-powered applications.