Analog Devices Inc./Maxim Integrated MAX6383XR44D3

Overview

MAX6383XR44D3 from Maxim Integrated is a single-supply, open-drain active-low microprocessor supervisory circuit in 3-pin SC70 package, monitoring VCC from +1.8V to +5.0V with 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 - used for reliable power-on reset in battery-powered IoT sensors and low-voltage embedded controllers.

For engineers reviewing the MAX6383XR44D3 datasheet, MAX6383XR44D3 pinout, MAX6383XR44D3 application, or MAX6383XR44D3 equivalent, key selection criteria include its open-drain output requiring external pull-up, guaranteed valid reset down to VCC = 1V, immunity to negative-going VCC transients, and compatibility with space-constrained portable designs where ultra-low quiescent current is critical.

Technical Context

The MAX6383XR44D3 implements a precision bandgap-based voltage comparator with ±2.5% threshold accuracy across -40°C to +125°C and 60ppm/°C tempco, paired with a temperature-stable RC-based timeout timer delivering 140ms minimum assertion after VCC recovery. Its open-drain RESET output requires an external pull-up resistor and remains asserted during brownout, power-up, and manual reset events.

Unlike push-pull variants, this device lacks MR input or auxiliary RESET IN functionality - it is a dedicated single-threshold, single-output supervisor optimized for simplicity and minimal footprint. The 3-pin SC70 configuration eliminates unused terminals, reducing PCB area and parasitic capacitance in high-density layouts.

Key Specifications

Pinout & Package

MAX6383XR44D3 is housed in a 3-pin SC70 package (pkg code X3-2), with pins arranged linearly: Pin 1 = RESET (open-drain active-low), Pin 2 = VCC, Pin 3 = GND. No NC or auxiliary pins - minimal interconnect count reduces layout complexity and EMI susceptibility.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6326XR44D3+, MAX6383XR44D3 offers open-drain flexibility for multi-device reset buses but requires a pull-up; versus TPS3124E18DBVR, it delivers precise 4.38V detection essential for higher-voltage rails, albeit at higher quiescent current - making it the sole fit for 4.5V-system brownout protection in miniaturized designs.

Availability

MAX6383XR44D3 is available at Aetrix Electronics and suitable for battery-powered sensor nodes, low-voltage microcontroller systems, and portable medical wearables requiring stable component supply with lead-free, RoHS-compliant packaging and guaranteed -40°C to +125°C operation.

Supply support for MAX6383XR44D3 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 management, sensing, and interface applications, emphasizing high reliability and low-power operation.

The MAX6381–MAX6390 family was developed specifically for space- and power-constrained microprocessor supervision, delivering factory-trimmed thresholds, nanoscale quiescent current, and robust transient immunity in sub-1mm² packages.

FAQ

What is the exact reset threshold voltage of MAX6383XR44D3?

The MAX6383XR44D3 has a factory-set nominal reset threshold of 4.38V, with guaranteed limits of 4.27V (min) and 4.48V (max) over the full -40°C to +125°C temperature range, as defined by the "44" suffix in the part number and confirmed in the Reset Thresholds table of the datasheet.

Does MAX6383XR44D3 include a manual reset input (MR)?

No, MAX6383XR44D3 does not feature a manual reset input. It is a basic single-threshold supervisor without MR or auxiliary RESET IN functionality - unlike MAX6384–MAX6390 variants. Its pinout consists solely of RESET, VCC, and GND.

What package type and dimensions does MAX6383XR44D3 use?

MAX6383XR44D3 is supplied in a 3-pin SC70 package (pkg code X3-2), measuring 1.25mm × 0.85mm × 0.55mm with a 0.65mm pin pitch. This ultra-compact outline is documented in Maxim's package drawing 21-0075.

Can MAX6383XR44D3 operate reliably below 1.8V supply?

Yes, MAX6383XR44D3 is fully specified to operate down to VCC = 1.0V, with guaranteed valid reset output logic states throughout that range - though its 4.38V threshold means it will assert reset continuously below that voltage, serving as a hard brownout detector.

Is an external pull-up resistor required for MAX6383XR44D3's RESET pin?

Yes, MAX6383XR44D3 features an open-drain active-low RESET output, which requires an external pull-up resistor (typically 10kΩ to 100kΩ) to the host logic rail to establish a defined high state when not asserted - a fundamental requirement per its electrical specification.