Analog Devices Inc./Maxim Integrated MAX6383XR44D3-T

Overview

MAX6383XR44D3-T from Maxim Integrated is a low-power microprocessor supervisory circuit with open-drain active-low reset output, factory-set 4.38V reset threshold (±2.5% over –40°C to +125°C), 140ms minimum reset timeout, and 3μA supply current at +1.8V. It monitors single V_CC supply in battery-powered embedded systems where reliable power-on reset and brownout protection are critical.

For engineers reviewing the MAX6383XR44D3-T datasheet, MAX6383XR44D3-T pinout, MAX6383XR44D3-T application, or MAX6383XR44D3-T equivalent, key selection factors include its open-drain reset architecture requiring external pullup, guaranteed valid reset state down to V_CC = 1V, ±2.5% threshold accuracy across automotive temperature range, and SC70-3 package compatibility with space-constrained PCB layouts.

Technical Context

The MAX6383XR44D3-T implements a precision voltage comparator with internal 4.38V reference and a monostable timer for fixed 140ms reset assertion after V_CC recovery. Its open-drain RESET output supports wired-OR configuration with other reset sources and interfaces directly to µP reset inputs requiring active-low assertion.

No manual reset (MR) or auxiliary RESET IN inputs are present - this variant is optimized for single-supply monitoring only. Reset assertion occurs when V_CC falls below 4.38V and remains asserted for ≥140ms after V_CC rises above threshold, with immunity to negative-going transients up to 100mV overdrive for ≤35µs.

Key Specifications

Pinout & Package

MAX6383XR44D3-T uses a 3-pin SC70 package (outline 21-0075, land pattern 90-0208) with exposed pad not connected internally. Pin functions are validated per Maxim's official pin description table and typical operating circuit.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX809TRD3+T and TPS3808G33DBVR, the MAX6383XR44D3-T uniquely combines factory-set 4.38V trip, open-drain output, and ultra-low 3μA current in a 3-pin SC70 - making it optimal for space- and power-constrained 5V systems requiring shared reset infrastructure.

Availability

MAX6383XR44D3-T 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 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 and mixed-signal ICs for power, sensing, and interface applications in industrial, automotive, and communications markets.

The MAX6381–MAX6390 family delivers single/dual low-voltage, low-power µP reset circuits optimized for reliable power monitoring in battery-operated and harsh-environment systems where accuracy, quiescent current, and small footprint are critical.

FAQ

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

The MAX6383XR44D3-T has a factory-set nominal reset threshold of 4.38V, with guaranteed tolerance of ±2.5% over the full operating temperature range of –40°C to +125°C. This stability is achieved through laser-trimmed internal references and BiCMOS process design, eliminating need for external calibration. The MAX6383XR44D3-T maintains this accuracy without drift during thermal cycling in automotive or industrial deployments.

Does the MAX6383XR44D3-T include a manual reset input (MR) pin?

No, the MAX6383XR44D3-T does not include a manual reset input. Per Maxim's selector guide and pin configuration diagrams, MR functionality is exclusive to MAX6384/MAX6385/MAX6386/MAX6390 variants. The MAX6383XR44D3-T is a dedicated single-supply supervisor with only RESET, V_CC, and GND pins - simplifying layout and reducing BOM count where manual reset is unnecessary.

What is the minimum V_CC voltage at which the MAX6383XR44D3-T guarantees correct reset output logic state?

The MAX6383XR44D3-T guarantees valid reset output state down to V_CC = 1.0V, as specified in the Absolute Maximum Ratings and Electrical Characteristics tables. Below this voltage, the internal comparator and output stage may become indeterminate. This 1V guarantee ensures robust behavior during deep brownout conditions before complete power collapse, a key requirement for fail-safe operation in the MAX6383XR44D3-T's target applications.

Can the MAX6383XR44D3-T be used with a 5V supply, and what is its maximum rated V_CC?

Yes, the MAX6383XR44D3-T supports 5V operation: its absolute maximum V_CC rating is +6.0V, and operational range is 1.0V to 5.5V. With a 4.38V reset threshold, it is specifically suited for monitoring standard 5V ±5% supplies (4.75V–5.25V), asserting reset when voltage drops below 4.38V - well within specification limits. The MAX6383XR44D3-T's 3μA current at 1.8V and 7μA at 5.5V ensures minimal load on the 5V rail.

Is the MAX6383XR44D3-T RoHS-compliant and qualified for automotive use?

The MAX6383XR44D3-T carries the "+T" suffix, indicating lead(Pb)-free/RoHS-compliant packaging per Maxim's ordering information. However, it is not automotive-qualified: automotive versions require the "/V" suffix (e.g., MAX6383XR44D3/V+T). The MAX6383XR44D3-T is rated for –40°C to +125°C operation but lacks AEC-Q100 qualification documentation - suitable for industrial and commercial applications, not safety-critical automotive ECUs.