Analog Devices Inc./Maxim Integrated MAX6383XR44D3+T

Overview

MAX6383XR44D3+T from Maxim Integrated is an open-drain active-low microprocessor supervisory circuit designed for power-supply voltage monitoring in low-power embedded systems. It features a factory-set reset threshold of +4.38V (±2.5% over -40°C to +125°C), 140ms minimum reset timeout, and consumes only 3μA at +1.8V. It operates across 1.0V to 5.5V supply range and guarantees valid reset output down to VCC = 1V - used in battery-powered instrumentation and critical μP power sequencing.

For engineers reviewing the MAX6383XR44D3+T datasheet, MAX6383XR44D3+T pinout, MAX6383XR44D3+T application, or MAX6383XR44D3+T equivalent, key selection criteria include its open-drain active-low reset architecture, +4.38V threshold accuracy, 140ms timeout, SC70-3 package footprint, and compatibility with dual-voltage monitoring systems requiring guaranteed reset assertion during brownout.

Technical Context

The MAX6383XR44D3+T implements a precision bandgap-based reset comparator with ±2.5% threshold accuracy over full industrial temperature range (-40°C to +125°C) and 60ppm/°C tempco. Its internal timer generates a fixed 140ms minimum reset timeout after VCC rises above the +4.38V threshold.

As a member of the MAX6381–MAX6390 family, it uses BiCMOS process technology and provides open-drain RESET output requiring external pullup. It lacks manual reset (MR) and auxiliary RESET IN inputs - distinguishing it from MAX6384–MAX6390 and MAX6387–MAX6389 variants - and is optimized for single-rail, space-constrained applications where minimal quiescent current (3μA at 1.8V) is critical.

Key Specifications

Pinout & Package

MAX6383XR44D3+T is housed in a RoHS-compliant 3-pin SC70 package (outline 21-0075, land pattern 90-0208), with 0.65mm pitch and exposed pad not connected internally.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX809TRD3+T and TPS3808G33DBVR, MAX6383XR44D3+T offers precise +4.38V detection, open-drain flexibility, and lowest current at 1.8V - making it optimal for 4.5V rail supervision in space- and power-constrained designs where external pullup is acceptable.

Availability

MAX6383XR44D3+T is available at Aetrix Electronics and suitable for portable/battery-powered equipment, critical μP and μC power monitoring, and intelligent instrumentation requiring stable component supply and long-term lifecycle support.

Supply support for MAX6383XR44D3+T 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, mixed-signal, and high-reliability semiconductor solutions for industrial, automotive, and computing markets.

The MAX6381–MAX6390 product line delivers low-power, factory-trimmed μP reset circuits targeting space-constrained, battery-operated, and high-temperature embedded systems requiring guaranteed reset behavior across voltage and thermal extremes.

FAQ

What is the exact reset threshold voltage of MAX6383XR44D3+T and how accurate is it over temperature?

The MAX6383XR44D3+T has a nominal reset threshold of +4.38V, with ±2.5% accuracy guaranteed over the full operating temperature range of -40°C to +125°C. This specification is confirmed in the Electrical Characteristics table of the official datasheet, and the threshold is factory-trimmed - no external calibration is required. The tempco is 60ppm/°C, contributing to stability across thermal gradients.

Does MAX6383XR44D3+T include a manual reset input (MR) or auxiliary RESET IN pin?

No, MAX6383XR44D3+T does not include a manual reset input (MR) or auxiliary RESET IN pin. Per the Selector Guide and Pin Configurations, only MAX6384–MAX6390 feature MR, and only MAX6387–MAX6389 include RESET IN. MAX6383XR44D3+T is a basic 3-pin variant with VCC, GND, and open-drain RESET - simplifying design for single-rail applications where those extra functions are unnecessary.

What is the reset timeout period of MAX6383XR44D3+T and is it guaranteed minimum or typical?

The MAX6383XR44D3+T has a guaranteed minimum reset timeout period of 140ms, as indicated by the "D3" suffix per the Reset Timeout Delay table. This is a minimum specification - actual timeout may be longer due to process variation, but will never be shorter. The timeout begins when VCC rises above the +4.38V threshold and ensures sufficient hold time for power stabilization before μP release.

Can MAX6383XR44D3+T operate reliably at VCC = 1.0V, and what happens to the RESET output below that?

Yes, MAX6383XR44D3+T guarantees valid RESET output state down to VCC = 1.0V - meaning the open-drain output correctly asserts low when VCC falls below +4.38V and remains asserted until timeout expires, even at 1.0V. Below 1.0V, operation is outside absolute maximum ratings; the device may not assert reset reliably, and VCC must not fall below -0.3V per Absolute Maximum Ratings.

Is MAX6383XR44D3+T pin-compatible with older Maxim reset ICs like MAX809?

MAX6383XR44D3+T is pin-compatible with MAX809 variants in the 3-pin SC70 package - sharing identical VCC, GND, and RESET pin assignments. However, MAX809 uses push-pull active-low output, while MAX6383XR44D3+T uses open-drain active-low, requiring an external pullup resistor. No PCB changes are needed for footprint, but schematic modification is required to add the pullup for proper logic-level translation.