Analog Devices Inc./Maxim Integrated MAX6383XR40D1+T

Overview

MAX6383XR40D1+T from Maxim Integrated is a low-power, open-drain active-low microprocessor supervisory circuit with factory-set 4.0V reset threshold and 1ms minimum reset timeout. It monitors VCC from +1.8V to +5.0V, consumes only 3μA at +1.8V, guarantees valid reset output down to VCC = 1V, and is housed in a 3-pin SC70 package for space-constrained power-up sequencing in battery-powered microcontroller systems.

For engineers reviewing the MAX6383XR40D1+T datasheet, MAX6383XR40D1+T pinout, MAX6383XR40D1+T application, or MAX6383XR40D1+T equivalent, key selection considerations include its open-drain reset output requiring external pullup, ±2.5% reset threshold accuracy over –40°C to +125°C, immunity to negative-going VCC transients, and compatibility with dual-voltage monitoring architectures via auxiliary reset inputs in related family members.

Technical Context

The MAX6383XR40D1+T implements a precision voltage comparator with internal 4.0V reference (±2.5% over temperature) and a monostable timer that asserts the open-drain RESET output low when VCC falls below threshold and holds it for ≥1ms after VCC rises above threshold. Its reset assertion is guaranteed functional down to VCC = 1V, enabling reliable brownout detection in ultra-low-voltage operation.

No manual reset (MR) input or auxiliary RESET IN terminal is integrated - this variant is optimized for single-supply monitoring with minimal external components. The 3-pin SC70 configuration dedicates pins exclusively to VCC, GND, and open-drain RESET, eliminating NC terminals and simplifying PCB layout for dedicated reset supervision.

Key Specifications

Pinout & Package

MAX6383XR40D1+T uses a 3-pin SC70 package (outline 21-0075, land pattern 90-0208), with no NC pins. The open-drain RESET output requires an external pullup resistor to the monitored supply or logic rail.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX809TRD1+T and TPS3808G33DBVR, MAX6383XR40D1+T uniquely combines factory-set 4.0V threshold, 1ms fixed timeout, open-drain output for bus sharing, and lowest ICC at 1.8V - making it optimal for compact, battery-sensitive 4V-system reset supervision where external component minimization is critical.

Availability

MAX6383XR40D1+T is available at Aetrix Electronics and suitable for portable/battery-powered equipment, critical μP and μC power monitoring, and industrial sensor node designs requiring stable component supply and long-term manufacturability.

Supply support for MAX6383XR40D1+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, with emphasis on low-power, high-reliability solutions for industrial and automotive markets.

The MAX6381–MAX6390 family delivers single/dual low-voltage microprocessor supervisory circuits targeting space- and power-constrained embedded systems requiring guaranteed reset behavior across wide temperature and supply ranges.

FAQ

What is the reset threshold voltage of MAX6383XR40D1+T and how accurate is it over temperature?

The MAX6383XR40D1+T has a factory-set reset threshold of 4.00V, specified with ±2.5% tolerance over the full operating temperature range of –40°C to +125°C. This accuracy is guaranteed by design and ensures reliable brownout detection in demanding industrial environments without requiring calibration or trimming. The MAX6383XR40D1+T maintains this specification under all valid VCC conditions from +1.0V to +5.5V.

Does MAX6383XR40D1+T include a manual reset (MR) input?

No, MAX6383XR40D1+T does not include a manual reset input. It is a dedicated single-supply reset supervisor with only VCC, GND, and open-drain RESET pins. Manual reset capability is present only in other variants such as MAX6384–MAX6386 and MAX6390. The MAX6383XR40D1+T is optimized for simplicity and minimal footprint in applications requiring only VCC monitoring.

What is the minimum reset timeout period for MAX6383XR40D1+T and how is it implemented?

The MAX6383XR40D1+T provides a fixed minimum reset timeout period of 1ms, denoted by the "D1" suffix in its part number. This timeout is generated by an internal monostable timer that begins counting when VCC rises above the 4.0V threshold and holds the open-drain RESET output low for at least 1ms thereafter. The MAX6383XR40D1+T guarantees this timing across –40°C to +125°C with no external components required.

Can MAX6383XR40D1+T operate reliably at very low supply voltages?

Yes, MAX6383XR40D1+T guarantees correct reset output state down to VCC = 1.0V, ensuring valid logic levels even during deep brownout conditions. Its internal comparator and timer remain functional across the full 1.0V to 5.5V operating range, and the open-drain RESET output maintains defined behavior (high-impedance when deasserted, sinking capability when asserted) throughout. This makes MAX6383XR40D1+T suitable for ultra-low-power shutdown sequencing where supply collapse must be accurately tracked.

What package type and footprint does MAX6383XR40D1+T use, and is it RoHS-compliant?

MAX6383XR40D1+T is supplied in a 3-pin SC70 package (outline 21-0075, land pattern 90-0208), measuring 1.25mm × 0.85mm with 0.65mm pitch. The "+T" suffix confirms it is lead(Pb)-free and RoHS-compliant. This package offers excellent thermal performance (θJA = 340.4°C/W on multilayer board) and is optimized for high-density PCB layouts in portable and wearable electronics. The MAX6383XR40D1+T requires no NC connections, simplifying routing and assembly.