Analog Devices Inc./Maxim Integrated MAX6385XS24D4-T

Overview

The MAX6385XS24D4-T from Maxim Integrated is a low-power, active-high push-pull μP supervisory circuit with factory-set 2.40V reset threshold, 1120ms VCC reset timeout, and debounced manual reset input (MR). It monitors +1.8V to +5.0V supply rails, consumes only 3μA at +1.8V, guarantees valid reset output down to VCC = 1V, and operates across –40°C to +125°C for use in industrial controllers and battery-powered instrumentation.

For engineers reviewing the MAX6385XS24D4-T datasheet, MAX6385XS24D4-T pinout, MAX6385XS24D4-T application, or MAX6385XS24D4-T equivalent, key selection criteria include reset threshold accuracy (±2.5% over temperature), MR input pullup resistance (63kΩ), open-drain vs. push-pull output configuration, timeout delay tolerance (min 1120ms), and SC70-4 package compatibility with space-constrained embedded designs.

Technical Context

This device implements a precision voltage comparator with internal 2.40V reference and an independent monostable timer that initiates on VCC falling below threshold or MR assertion. The reset timeout period is fixed at 1120ms (min) for VCC recovery and applies identically to MR release due to shared timing architecture.

It features a dedicated MR input with internal 63kΩ pullup resistor, guaranteed glitch rejection (100ns), and MR-to-reset delay of 200ns. The active-high push-pull RESET output drives high during reset assertion and guarantees logic validity down to VCC = 1V - critical for brownout detection in low-voltage microcontroller systems.

Key Specifications

Pinout & Package

MAX6385XS24D4-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 μP reset applications.

Compared with MAX6385LT24D4-T, the MAX6385XS24D4-T offers smaller footprint and faster assembly but slightly higher thermal resistance; versus TPS3808G33DBVR, it provides precise 2.40V threshold and integrated MR - essential for systems requiring manual intervention and tight voltage margining.

Availability

MAX6385XS24D4-T is available at Aetrix Electronics and suitable for industrial controllers, portable medical devices, battery-powered data loggers, and automotive body control modules requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MAX6385XS24D4-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, with emphasis on low-power, high-reliability solutions.

The MAX6381–MAX6390 family delivers single/dual low-voltage μP reset circuits optimized for space-constrained, battery-sensitive, and thermally harsh environments - targeting applications where deterministic power-on sequencing and brownout immunity are non-negotiable.

FAQ

What is the exact reset threshold voltage of the MAX6385XS24D4-T?

The MAX6385XS24D4-T has a factory-set reset threshold of 2.40V, specified with ±2.5% accuracy over the full operating temperature range of –40°C to +125°C. This value is confirmed in the Reset Thresholds table of the datasheet (suffix "24" corresponds to 2.40V nominal), and applies to VCC monitoring only - the device lacks RESET IN functionality.

Does the MAX6385XS24D4-T support manual reset, and how is it implemented?

Yes, the MAX6385XS24D4-T includes a debounced manual reset input (MR) on Pin 3. It features an internal 63kΩ pullup resistor to VCC, requires no external components, and asserts reset when driven low (≤0.3×VCC). The MR-to-reset delay is 200ns, and it rejects glitches as short as 100ns - making the MAX6385XS24D4-T suitable for noisy industrial environments.

What is the reset timeout duration for the MAX6385XS24D4-T, and is it adjustable?

The MAX6385XS24D4-T provides a fixed minimum reset timeout of 1120ms for both VCC recovery and MR release events. This value is encoded in the "D4" suffix and is not user-adjustable - it is generated by an internal monostable timer. No external capacitor or resistor is required, ensuring consistent timing across voltage and temperature variations.

What package type and pin count does the MAX6385XS24D4-T use?

The MAX6385XS24D4-T is supplied in a 4-pin SC70 package (outline number 21-0098), measuring 2.0mm × 2.1mm × 0.95mm. Its pinout is VCC (Pin 1), RESET (Pin 2), MR (Pin 3), and GND (Pin 4). This compact RoHS-compliant package supports reflow soldering and is compatible with standard SC70 pick-and-place equipment.

Is the MAX6385XS24D4-T suitable for automotive applications?

The MAX6385XS24D4-T itself is not AEC-Q100 qualified; however, the MAX6385XS24D4/V+T variant (with "/V" suffix) is automotive-grade and rated for –40°C to +125°C. For non-automotive industrial use, the MAX6385XS24D4-T meets all electrical and thermal specifications required in harsh environments - but formal automotive qualification requires the /V version.