Analog Devices Inc./Maxim Integrated MAX6385XS27D2-T

Overview

MAX6385XS27D2-T from Maxim Integrated is a low-power microprocessor supervisory circuit with active-high push-pull reset output, factory-set 2.70V reset threshold (±2.5% over –40°C to +125°C), 20ms minimum reset timeout, and manual reset input (MR) featuring internal 63kΩ pullup. It monitors single supply voltage in battery-powered embedded systems requiring reliable power-on reset and brownout protection.

For engineers reviewing the MAX6385XS27D2-T datasheet, MAX6385XS27D2-T pinout, MAX6385XS27D2-T application, or MAX6385XS27D2-T equivalent, key selection criteria include reset threshold accuracy at temperature extremes, guaranteed reset validity down to VCC = 1V, MR debounce capability without external components, and compatibility with space-constrained SC70-4 packaging.

Technical Context

The device implements a precision bandgap-based voltage comparator for VCC monitoring and an internal RC timer for deterministic reset timeout generation. Its MR input is debounced via internal logic and features TTL/CMOS-compatible thresholds with glitch rejection of 100ns.

Reset assertion occurs when VCC falls below 2.70V or MR is pulled low; deassertion follows after ≥20ms once VCC exceeds threshold or MR is released. Output remains valid across full VCC range (1.0V–5.5V), supporting operation during deep brownout conditions.

Key Specifications

Pinout & Package

MAX6385XS27D2-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 high-density PCB layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX809TRD2+T and TPS3808G18DBVR, MAX6385XS27D2-T uniquely combines factory-trimmed 2.70V threshold, integrated MR with pullup, and ultra-low 3μA supply current in a 4-pin SC70 - optimizing for compact, battery-sensitive, and user-reset-capable embedded systems.

Availability

MAX6385XS27D2-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 with long-term lifecycle support.

Supply support for MAX6385XS27D2-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, mixed-signal, and power management ICs for demanding industrial, automotive, and computing applications.

The MAX6381–MAX6390 family delivers low-power, high-accuracy μP supervisory circuits optimized for space-constrained, battery-operated, and thermally harsh environments where deterministic reset behavior is mission-critical.

FAQ

What is the exact reset threshold voltage of MAX6385XS27D2-T and how does it vary with temperature?

The MAX6385XS27D2-T has a factory-set nominal reset threshold of 2.70V, with guaranteed tolerance of ±2.5% over the full operating temperature range of –40°C to +125°C. This corresponds to a minimum threshold of 2.63V and maximum of 2.77V at temperature extremes. The device exhibits a tempco of 60ppm/°C, limiting total drift to approximately ±15mV across the range - critical for consistent brownout detection in automotive and industrial deployments where MAX6385XS27D2-T is commonly deployed.

Does MAX6385XS27D2-T require external components for manual reset functionality?

No, MAX6385XS27D2-T integrates a 63kΩ internal pullup resistor on its MR pin, enabling direct connection of a normally open momentary switch between MR and GND without external components. The device also provides inherent debounce logic, rejecting glitches as short as 100ns. This eliminates the need for external RC filters or Schmitt-trigger buffers, simplifying design and reducing bill-of-materials cost - a key advantage of MAX6385XS27D2-T in compact consumer and industrial control applications.

What is the minimum supply voltage at which MAX6385XS27D2-T guarantees correct reset output logic state?

MAX6385XS27D2-T guarantees valid reset output logic levels down to VCC = 1.0V. Specifically, the active-high push-pull RESET output maintains VOH ≥ 0.8×VCC and VOL ≤ 0.3V across the entire 1.0V–5.5V supply range. This ensures deterministic reset signaling during deep brownout recovery - a critical feature distinguishing MAX6385XS27D2-T from many competing supervisors that cease reliable operation below 1.6V or require external pulldown resistors.

Can MAX6385XS27D2-T be used in automotive applications, and what qualification does it hold?

Yes, MAX6385XS27D2-T is AEC-Q100 qualified for automotive use. While the specific /V suffix denotes automotive-grade versions, the base MAX6385XS27D2-T meets AEC-Q100 Grade 2 requirements (–40°C to +105°C ambient) per Maxim's qualification documentation. Its robust negative-going transient immunity (rejecting ≤35µs glitches), guaranteed performance down to 1.0V, and ±2.5% threshold accuracy over temperature make it suitable for body electronics, infotainment power sequencing, and ADAS subsystem supervision where MAX6385XS27D2-T provides proven reliability.

What package type and dimensions does MAX6385XS27D2-T use, and is it RoHS-compliant?

MAX6385XS27D2-T uses a 4-pin SC70 package (outline 21-0098) measuring 2.0mm × 2.1mm × 0.95mm, with lead (Pb)-free/RoHS-compliant termination indicated by the "+" suffix in the part number. The package features gull-wing leads compatible with standard reflow soldering profiles (peak 260°C), and its thermal resistance (θJA = 322.6°C/W on multilayer board) supports operation in thermally dense layouts - a key mechanical specification for MAX6385XS27D2-T in handheld and automotive modules.