Analog Devices Inc./Maxim Integrated MAX6385XS38D5-T

Overview

MAX6385XS38D5-T from Maxim Integrated is a low-power microprocessor supervisory circuit with active-high push-pull reset output, factory-set 3.80V reset threshold (±2.5% over –40°C to +125°C), 280ms minimum VCC reset timeout, and debounced manual reset input (MR). It monitors single supply voltage in battery-powered embedded systems and guarantees valid reset state down to VCC = 1V.

For engineers reviewing the MAX6385XS38D5-T datasheet, MAX6385XS38D5-T pinout, MAX6385XS38D5-T application, or MAX6385XS38D5-T equivalent, key selection criteria include reset threshold accuracy, MR timing behavior, SC70-4 package footprint, low 3μA supply current at 1.8V, and compatibility with dual-voltage monitoring designs requiring guaranteed reset assertion during brownout.

Technical Context

The MAX6385XS38D5-T implements a precision bandgap-based reset comparator with ±2.5% threshold tolerance across –40°C to +125°C and 60ppm/°C tempco. Its internal timer enforces a fixed 280ms minimum reset timeout after VCC recovery or MR release.

It features an internal 63kΩ pullup on the MR pin, accepts TTL/CMOS-compatible logic levels, and asserts reset when either VCC falls below 3.80V or MR is driven low - with reset remaining active for the full timeout period after the triggering condition ends.

Key Specifications

Pinout & Package

MAX6385XS38D5-T is housed in a RoHS-compliant 4-pin SC70 package (outline 21-0098, land pattern 90-0187), measuring 1.3mm × 1.1mm × 0.6mm with gull-wing leads.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6385XS38D5-T, the MAX6385XS38D3-T offers faster reset release but reduced noise margin during recovery, while the TPS3123E18DBVR trades MR capability and threshold flexibility for lower ICC and smaller SOT-23 footprint - making each suitable for distinct subsystem-level trade-offs in power, timing, and control requirements.

Availability

MAX6385XS38D5-T is available at Aetrix Electronics and suitable for portable medical sensors, battery-powered IoT nodes, industrial PLC I/O modules, and automotive body control units requiring stable component supply and long-term manufacturability.

Supply support for MAX6385XS38D5-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 management, sensing, and interface applications in industrial, automotive, and computing markets.

The MAX6381–MAX6390 family delivers low-power, high-accuracy reset supervision for microprocessor-based systems where reliability under voltage stress and minimal board space are critical design constraints.

FAQ

What is the exact reset threshold voltage of the MAX6385XS38D5-T?

The MAX6385XS38D5-T has a factory-set nominal reset threshold of 3.80V, with guaranteed tolerance of ±2.5% over the full operating temperature range (–40°C to +125°C). This value is laser-trimmed during production and does not require external calibration. The "38" suffix in the part number explicitly denotes the 3.80V threshold per Maxim's ordering guide.

Does the MAX6385XS38D5-T support manual reset functionality?

Yes, the MAX6385XS38D5-T includes a debounced manual reset input (MR) pin with an internal 63kΩ pullup resistor to VCC. Driving MR low forces an immediate reset assertion, which remains active for the full 280ms timeout period after MR is released. No external components are needed for basic switch interfacing, and the internal debounce eliminates need for RC filters.

What package type and dimensions does the MAX6385XS38D5-T use?

The MAX6385XS38D5-T is supplied in a 4-pin SC70 package (outline number 21-0098, land pattern 90-0187), measuring 1.3mm × 1.1mm × 0.6mm with gull-wing leads. This RoHS-compliant, lead-free package is optimized for high-density PCB layouts in portable and space-constrained applications.

Can the MAX6385XS38D5-T operate reliably at very low supply voltages?

Yes, the MAX6385XS38D5-T guarantees correct reset output logic state down to VCC = 1.0V. Its internal circuitry remains functional and the RESET output remains valid throughout this range, enabling safe microprocessor initialization even during deep brownout conditions - a key requirement for battery-backed and energy-harvesting systems.

How does the reset timeout behavior differ between VCC recovery and manual reset release on the MAX6385XS38D5-T?

The MAX6385XS38D5-T uses the same 280ms minimum timeout period for both VCC recovery and MR release. Unlike the MAX6390, it does not implement separate timeout values for these events. The datasheet specifies "D5" as the timeout suffix, corresponding exclusively to the 280ms VCC reset delay, and this timing applies uniformly regardless of reset trigger source.