Analog Devices Inc./Maxim Integrated MAX6385XS39D3-T

Overview

MAX6385XS39D3-T from Maxim Integrated is a precision microprocessor supervisory circuit with active-high push-pull reset output, factory-set 3.90V ±2.5% reset threshold, and 140ms minimum VCC reset timeout. It monitors single supply voltage (1.0V–5.5V), consumes only 3μA at 1.8V, and guarantees valid reset state down to VCC = 1V - used in battery-powered controllers and portable instrumentation for reliable power-on reset and brownout protection.

For engineers reviewing the MAX6385XS39D3-T datasheet, MAX6385XS39D3-T pinout, MAX6385XS39D3-T application, or MAX6385XS39D3-T equivalent, key selection criteria include its 3.90V threshold accuracy over –40°C to +125°C, debounced manual reset input with internal 63kΩ pullup, SC70-4 package footprint, and compatibility with systems requiring guaranteed reset assertion during slow-rising or noisy VCC conditions.

Technical Context

The MAX6385XS39D3-T implements a precision bandgap-based voltage comparator with ±2.5% threshold tolerance across temperature, paired with a monotonic RC timer for deterministic 140ms reset timeout after VCC recovery. Its active-high push-pull output drives directly into μP reset inputs without external pullup.

It integrates a debounced manual reset input (MR) with 1µs minimum pulse width support and 100ns glitch rejection, internally pulled up to VCC via 63kΩ. The device asserts reset when VCC falls below 3.90V or MR is driven low, maintaining reset for the full timeout period after either condition clears.

Key Specifications

Pinout & Package

MAX6385XS39D3-T is housed in a RoHS-compliant 4-pin SC70 package (outline 21-0098, land pattern 90-0187), measuring 2.0mm × 2.1mm × 0.95mm, suitable for space-constrained portable designs.

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 MAX6385XS39D3-T uniquely delivers 3.90V precision supervision with active-high push-pull output and integrated debounced MR in a 4-pin SC70 - reducing component count and PCB area while enabling robust manual reset in compact, battery-sensitive designs.

Availability

MAX6385XS39D3-T is available at Aetrix Electronics and suitable for portable medical sensors, industrial PLC I/O modules, automotive body control units, and smart energy meters requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MAX6385XS39D3-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 demanding industrial, automotive, and computing applications - emphasizing low power, high reliability, and AEC-Q100 qualification.

The MAX6381–MAX6390 family was engineered specifically for microprocessor reset supervision in space- and power-constrained systems, delivering factory-trimmed thresholds, sub-μA quiescent current, and guaranteed operation from 1.0V to 5.5V.

FAQ

What is the exact reset threshold voltage of the MAX6385XS39D3-T?

The MAX6385XS39D3-T has a nominal reset threshold of 3.90V, with guaranteed tolerance of ±2.5% over the full operating temperature range (–40°C to +125°C). This value is factory-trimmed and specified in the Reset Thresholds table of the datasheet - no external components are needed to set this threshold. The MAX6385XS39D3-T maintains this accuracy without calibration or trimming in end equipment.

Does the MAX6385XS39D3-T support manual reset, and how is it implemented?

Yes, the MAX6385XS39D3-T features a debounced manual reset input (MR) on Pin 3. It is active-low and includes an internal 63kΩ pullup resistor to VCC, allowing direct connection of a momentary switch to GND without external components. The MR input rejects glitches shorter than 100ns and requires a minimum pulse width of 1µs to trigger reset. The MAX6385XS39D3-T holds reset for the full 140ms timeout after MR is released.

What package type and dimensions does the MAX6385XS39D3-T use?

The MAX6385XS39D3-T is supplied in a lead(Pb)-free, RoHS-compliant 4-pin SC70 package (outline number 21-0098), measuring 2.0mm × 2.1mm × 0.95mm. Its land pattern is documented as 90-0187. This compact footprint enables high-density placement in portable and automotive electronics where board space is constrained - notably smaller than 6-pin µDFN variants in the same family.

Can the MAX6385XS39D3-T operate reliably at very low supply voltages?

Yes, the MAX6385XS39D3-T guarantees functional operation and valid reset output state down to VCC = 1.0V. Its internal comparator and timer remain fully operational across the entire 1.0V–5.5V supply range. This ensures deterministic reset behavior during deep brownout or battery depletion - critical for maintaining system integrity in coin-cell–powered devices. The MAX6385XS39D3-T does not require auxiliary biasing to sustain reset assertion below 1.8V.

Is the MAX6385XS39D3-T qualified for automotive applications?

The MAX6385XS39D3-T carries the "+T" suffix indicating RoHS compliance, but it is not explicitly marked with the "/V" automotive qualification suffix in its ordering code. While it operates across –40°C to +125°C and meets AEC-Q100 requirements *within its specific trim version*, full automotive qualification requires verification of the /V variant (e.g., MAX6385XS39D3/V+T). For mission-critical automotive use, confirm qualification status via Maxim/Analog Devices' official automotive product documentation before design-in.