Analog Devices Inc./Maxim Integrated MAX6385XS27D7-T

Overview

MAX6385XS27D7-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), 1200ms minimum VCC reset timeout, and debounced manual reset input (MR). It monitors single supply voltage in battery-powered or space-constrained embedded systems requiring reliable power-on reset and brownout protection.

For engineers reviewing the MAX6385XS27D7-T datasheet, MAX6385XS27D7-T pinout, MAX6385XS27D7-T application, or MAX6385XS27D7-T equivalent, key selection criteria include its 2.70V threshold accuracy, 1200ms VCC timeout, MR input compatibility with TTL/CMOS logic, guaranteed reset validity down to VCC = 1V, and 4-pin SC70 package footprint.

Technical Context

The MAX6385XS27D7-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 1200ms minimum reset assertion period after VCC recovers above 2.70V.

It features an internal 63kΩ pullup on the MR pin, accepts logic-low manual reset pulses ≥1µs wide, and guarantees correct RESET output state for VCC ≥ 1V - enabling robust operation during deep brownout conditions without external support circuitry.

Key Specifications

Pinout & Package

MAX6385XS27D7-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 MAX6385XS27D4-T, the MAX6385XS27D7-T provides 80ms longer guaranteed reset assertion - critical for FPGAs or flash memory initialization. Against TPS3808G125DBVR, it offers pin-native active-high drive and tighter threshold matching to 2.7V rails, reducing BOM count and validation effort.

Availability

MAX6385XS27D7-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 long product lifecycles.

Supply support for MAX6385XS27D7-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, sensing, and interface applications in industrial, automotive, and computing markets.

The MAX6381–MAX6390 family delivers ultra-low-power, factory-trimmed supervisory circuits optimized for battery-operated and thermally demanding embedded systems requiring deterministic reset timing and high noise immunity.

FAQ

What is the exact reset threshold voltage of the MAX6385XS27D7-T and how stable is it over temperature?

The MAX6385XS27D7-T has a 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 achieves this stability via laser-trimmed bandgap reference and exhibits a tempco of 60ppm/°C, ensuring minimal drift across thermal cycling in automotive or industrial deployments.

Does the MAX6385XS27D7-T require external components to operate, and what is the role of the MR pin?

No, the MAX6385XS27D7-T operates autonomously with only VCC and GND connections. Its MR (manual reset) pin features an internal 63kΩ pullup resistor to VCC, allowing direct connection to a momentary switch (to GND) or CMOS/TTL logic without external biasing. A logic-low pulse ≥1µs on MR forces reset assertion for the full 1200ms timeout, making it ideal for field service, diagnostics, or firmware recovery without adding passive components.

How does the MAX6385XS27D7-T behave when VCC drops below 1.0V, and is reset signaling maintained?

The MAX6385XS27D7-T guarantees correct RESET output logic state only down to VCC = 1.0V. Below that, internal circuitry cannot maintain defined operation. However, the device ensures that RESET remains asserted (high) as VCC falls from 2.70V to 1.0V, and deasserts cleanly only after VCC rises above 2.70V and the 1200ms timer expires. For applications requiring valid reset down to 0V, external pulldown resistors are recommended - though this is not needed for most MCU interfaces with built-in weak pullups.

What package type and dimensions does the MAX6385XS27D7-T use, and is it RoHS-compliant?

The MAX6385XS27D7-T uses a 4-pin SC70 package (outline number 21-0098), measuring 2.0mm × 2.1mm × 0.95mm with 0.65mm lead pitch. It is RoHS-compliant and lead-free, indicated by the "+" suffix in the ordering code. This compact footprint supports high-density routing in space-constrained applications like wearable electronics and modular sensor nodes.

Can the MAX6385XS27D7-T be used in automotive applications, and what qualification does it hold?

The base MAX6385XS27D7-T is rated for -40°C to +125°C operation and is AEC-Q100 qualified in designated /V variants (e.g., MAX6385XS27D7/V+T). While the standard MAX6385XS27D7-T is not automotive-grade, its thermal performance, reset accuracy, and transient immunity meet core requirements for body electronics. For certified automotive use, specify the /V suffix version - which undergoes additional stress testing and lot traceability per AEC-Q100 Rev G.