Analog Devices Inc./Maxim Integrated MAX6385XS27D6-T

Overview

MAX6385XS27D6-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), 560ms minimum VCC reset timeout, and debounced manual reset input (MR). It monitors single supply voltage in battery-powered embedded systems, ensuring reliable μP initialization during power-up, brownout, or transient events.

For engineers reviewing the MAX6385XS27D6-T datasheet, MAX6385XS27D6-T pinout, MAX6385XS27D6-T application, or MAX6385XS27D6-T equivalent, key selection criteria include its 2.70V threshold accuracy, 560ms reset hold time, MR input compatibility with TTL/CMOS logic, guaranteed valid reset down to VCC = 1V, and 4-pin SC70 package footprint.

Technical Context

The MAX6385XS27D6-T integrates a precision voltage comparator with ±2.5% threshold accuracy across –40°C to +125°C and a programmable monostable timer for 560ms minimum reset assertion after VCC recovery. Its internal 63kΩ MR pullup resistor enables direct connection of a momentary switch to GND without external components.

This device uses a BiCMOS process to achieve 3μA supply current at 1.8V and guarantees correct RESET logic state down to VCC = 1V. It features negative-going VCC transient immunity up to 100mV overdrive with pulse widths under 35µs, per typical operating characteristics.

Key Specifications

Pinout & Package

MAX6385XS27D6-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, optimized 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 MAX6385XS27D6-T, the LT27D6 variant offers identical electrical performance in a larger package with inferior thermal metrics, while the TPS3123E18DBVR trades MR support and longer timeout for superior threshold accuracy and lower quiescent current - making each suitable for distinct subsystem requirements.

Availability

MAX6385XS27D6-T is available at Aetrix Electronics and suitable for portable medical sensors, industrial PLC I/O modules, automotive body control units, and smart home hub power management requiring stable component supply across extended temperature and lifecycle demands.

Supply support for MAX6385XS27D6-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 delivers single/dual low-voltage μP reset circuits targeting battery-powered and thermally constrained systems where guaranteed reset behavior across voltage and temperature extremes is mandatory.

FAQ

What is the exact reset threshold voltage of MAX6385XS27D6-T and how stable is it over temperature?

The MAX6385XS27D6-T has a factory-set nominal reset threshold of 2.70V, with guaranteed accuracy of ±2.5% over the full operating range of –40°C to +125°C. This stability is achieved via laser-trimmed on-chip references and BiCMOS process matching, eliminating need for external calibration. The device's 60ppm/°C tempco ensures minimal drift within the specified tolerance band, making it suitable for automotive and industrial environments where ambient temperature swings are extreme.

Does MAX6385XS27D6-T support manual reset, and what are the interface requirements?

Yes, MAX6385XS27D6-T includes a dedicated MR (manual reset) input with an internal 63kΩ pullup resistor to VCC. To assert reset, drive MR below 0.3×VCC for ≥1µs; the device then holds RESET high for the full 560ms timeout after MR returns high. No external components are needed - a normally open momentary switch from MR to GND suffices. The input accepts TTL/CMOS logic levels and tolerates noise via 100ns glitch rejection.

Can MAX6385XS27D6-T operate reliably when VCC drops below 1.8V?

Yes, MAX6385XS27D6-T guarantees correct RESET output logic state down to VCC = 1.0V, as confirmed in the Absolute Maximum Ratings and Electrical Characteristics tables. At VCC = 1.0V, the push-pull output maintains VOL ≤ 0.3V (sink) and VOH ≥ 0.8×VCC (source) under specified load conditions. This ensures deterministic reset assertion during deep brownout - critical for preserving state in energy-harvesting and ultra-low-power systems.

What package type and dimensions does MAX6385XS27D6-T use, and is it RoHS-compliant?

MAX6385XS27D6-T is supplied in a lead(Pb)-free, RoHS-compliant 4-pin SC70 package (outline number 21-0098, land pattern 90-0187), measuring 2.0mm × 2.1mm × 0.95mm. The "+T" suffix in the part number explicitly denotes RoHS compliance. This compact footprint supports high-density layouts in portable electronics and enables automated placement with standard SC70 feeders, with thermal resistance θJA = 322.6°C/W on multilayer boards.

How does MAX6385XS27D6-T handle power-supply transients, and what protection is built-in?

MAX6385XS27D6-T incorporates inherent immunity to negative-going VCC transients: it suppresses reset pulses for glitches ≤35µs wide when the overdrive (VTH – VCC) is ≤100mV, as shown in Figure 7 of the datasheet. This is achieved via internal comparator hysteresis and timing filtering. For enhanced robustness, Maxim recommends placing a 0.1µF ceramic capacitor close to the VCC pin - a practice validated in typical operating circuits and widely adopted in automotive and industrial designs.