Analog Devices Inc./Maxim Integrated MAX6385XS44D3

Overview

MAX6385XS44D3 from Maxim Integrated is a single-supply, active-high push-pull microprocessor supervisory circuit with factory-set 4.38V reset threshold, 140ms minimum reset timeout, manual reset input (MR), and 4-pin SC70 package. It monitors VCC in low-power embedded systems, asserts RESET when supply drops below threshold, and guarantees valid output down to VCC = 1V. Designed for battery-powered controllers and portable instrumentation requiring stable brownout detection.

For engineers reviewing the MAX6385XS44D3 datasheet, MAX6385XS44D3 pinout, MAX6385XS44D3 application, or MAX6385XS44D3 equivalent, this page delivers verified electrical parameters, exact SC70-4 pin mapping, confirmed ±2.5% threshold accuracy over –40°C to +125°C, MR debounce capability, and real-world use cases in power-constrained µP systems.

Technical Context

The MAX6385XS44D3 implements a precision bandgap-based voltage comparator with internal 63kΩ MR pullup resistor and monostable timeout timer. Its reset assertion logic responds to VCC falling below 4.38V (±2.5%) or MR being pulled low, holding RESET high for ≥140ms after recovery.

It features negative-going VCC transient immunity up to 35µs at 100mV overdrive, operates from 1.0V to 5.5V supply, consumes only 3µA at 1.8V, and guarantees correct RESET state down to VCC = 1V - enabling reliable operation during deep brownout conditions.

Key Specifications

Pinout & Package

MAX6385XS44D3 is housed in a lead-free 4-pin SC70 package (package code X4-1), measuring 1.5mm × 1.0mm × 0.8mm, with exposed pad option not applicable. Pin 1 is marked with dot; pin 1 = VCC, pin 2 = RESET, pin 3 = MR, pin 4 = GND.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6385XS44D3, the LT44D3 variant offers identical supervision logic in a thermally robust µDFN package, while TPS3808G33DBVR provides lower ICC but sacrifices programmable threshold and integrated MR - making MAX6385XS44D3 optimal for compact, self-contained 4.38V brownout detection with manual override.

Availability

MAX6385XS44D3 is available at Aetrix Electronics and suitable for portable medical sensors, industrial PLC I/O modules, smart meter communication units, and automotive body control modules requiring stable component supply with guaranteed long-term sourcing.

Supply support for MAX6385XS44D3 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 industrial, automotive, and computing applications, with expertise in low-power supervision and power management.

The MAX6381–MAX6390 family was engineered for ultra-low-power microprocessor reset supervision in space-constrained, battery-operated, and harsh-environment systems - delivering factory-trimmed accuracy and robust transient immunity in miniature SC70/µDFN packages.

FAQ

What is the exact reset threshold voltage of MAX6385XS44D3?

The MAX6385XS44D3 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 value is derived from the "44" suffix in the part number, referencing the Reset Thresholds table where suffix 44 corresponds to VTH(nom) = 4.38V. The MAX6385XS44D3 uses this fixed threshold to monitor VCC without external components.

Does MAX6385XS44D3 include a manual reset input?

Yes, the MAX6385XS44D3 includes an active-low manual reset input (MR) on pin 3. It features an internal 63kΩ pullup resistor to VCC, allowing direct connection of a momentary switch to GND for system-level reset initiation. The MR signal is debounced internally, eliminating the need for external RC filtering. This functionality is confirmed in the Selector Guide and Pin Description sections for MAX6385XS44D3.

What is the reset timeout period for MAX6385XS44D3?

The MAX6385XS44D3 provides a minimum reset timeout period of 140ms, indicated by the "D3" suffix in the part number. This timeout begins when VCC rises above the 4.38V threshold or when the MR pin is released, and ensures the reset signal remains asserted long enough for microprocessor initialization. The actual timeout may vary slightly with temperature but remains ≥140ms across –40°C to +125°C.

Which package type does MAX6385XS44D3 use?

The MAX6385XS44D3 is packaged in a 4-pin SC70 (SC70-4) outline, with package code X4-1. Its dimensions are 1.5mm × 1.0mm × 0.8mm, and it is lead-free. This compact surface-mount package is distinct from the 3-pin SC70 used by MAX6381/MAX6382/MAX6383 and the 6-pin µDFN used by the LT-suffixed variants. Pin 1 is VCC, pin 2 is RESET, pin 3 is MR, and pin 4 is GND.

Is MAX6385XS44D3 compatible with 1.8V supply systems?

Yes, the MAX6385XS44D3 operates from 1.0V to 5.5V and is fully specified at 1.8V, drawing only 3µA typical supply current at that voltage. Its reset output remains valid and correctly asserted down to VCC = 1V, making it suitable for ultra-low-voltage systems such as energy-harvesting sensors or deep-sleep microcontrollers. The 4.38V threshold applies to the monitored VCC rail, not the device's minimum operating voltage.