Analog Devices Inc./Maxim Integrated MAX6385XS25D7-T

Overview

MAX6385XS25D7-T from Maxim Integrated is a low-power, active-high push-pull μP supervisory circuit designed to monitor +2.5V supply rails in embedded systems. It features a factory-set reset threshold of +2.50V (±2.5% over −40°C to +125°C), 1200ms minimum VCC reset timeout, and consumes only 4μA at +2.5V. It includes a debounced manual reset input (MR) and operates reliably down to VCC = 1.0V - ideal for battery-powered microcontroller power-up sequencing.

For engineers reviewing the MAX6385XS25D7-T datasheet, MAX6385XS25D7-T pinout, MAX6385XS25D7-T application, or MAX6385XS25D7-T equivalent, key selection criteria include its 4-pin SC70 package, active-high push-pull RESET output, precise +2.5V threshold with tight temperature stability, and MR-driven reset assertion with 150ms manual timeout - critical for portable instrumentation and industrial controllers requiring deterministic reset behavior under brownout conditions.

Technical Context

The MAX6385XS25D7-T implements a precision bandgap-based voltage comparator monitoring VCC against a trimmed internal reference, with reset assertion guaranteed for VCC falling below +2.50V. Its internal timer generates a fixed 1200ms reset timeout after VCC recovery, independent of supply ramp rate.

It integrates a debounced manual reset input (MR) with internal 63kΩ pullup, asserting RESET high for ≥150ms after MR release. The active-high push-pull output drives logic-compatible loads directly without external components, supporting valid reset state down to VCC = 1.0V.

Key Specifications

Pinout & Package

MAX6385XS25D7-T is housed in a RoHS-compliant 4-pin SC70 package (outline 21-0098), measuring 1.2mm × 1.6mm × 0.75mm, optimized for space-constrained PCB layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6385XS25D7-T, MAX6326XR25D7-T requires external pullup and lacks MR, while TPS3125M25DBVR offers lower ICC and better threshold accuracy but omits manual reset - making MAX6385XS25D7-T the only option combining +2.5V precision, 1200ms VCC timeout, 150ms MR timeout, and active-high push-pull in 4-pin SC70.

Availability

MAX6385XS25D7-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 across extended temperature ranges and long production lifecycles.

Supply support for MAX6385XS25D7-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.

The MAX6381–MAX6390 family delivers low-power, factory-trimmed μP supervisory circuits targeting space- and power-constrained embedded systems requiring guaranteed reset timing and robust brownout immunity.

FAQ

What is the exact reset threshold voltage of the MAX6385XS25D7-T and how stable is it over temperature?

The MAX6385XS25D7-T has a factory-set reset threshold of +2.50V, specified with ±2.5% accuracy over the full operating range of −40°C to +125°C. This corresponds to a minimum threshold of +2.44V and maximum of +2.56V at temperature extremes. The device achieves this stability using laser-trimmed on-chip references and low-drift comparator design, eliminating need for external calibration in 2.5V rail monitoring applications.

Does the MAX6385XS25D7-T support manual reset, and what is its timeout behavior?

Yes, the MAX6385XS25D7-T includes a debounced manual reset input (MR) with internal 63kΩ pullup resistor. When MR is pulled low, RESET asserts high immediately and remains asserted for a guaranteed minimum of 150ms after MR returns high. This fixed manual reset timeout is independent of the 1200ms VCC reset timeout and ensures consistent reset pulse width regardless of button press duration or contact bounce.

What package type and pin count does the MAX6385XS25D7-T use, and is it RoHS-compliant?

The MAX6385XS25D7-T is supplied in a 4-pin SC70 package (outline 21-0098), measuring 1.2mm × 1.6mm × 0.75mm. The "+T" suffix confirms it is lead(Pb)-free and RoHS-compliant. This compact, surface-mount package supports standard reflow soldering and is optimized for high-density PCB layouts in portable and automotive electronics.

Can the MAX6385XS25D7-T operate reliably when VCC drops below 2.5V, and down to what voltage does RESET remain valid?

Yes - the MAX6385XS25D7-T is fully functional down to VCC = 1.0V, and its RESET output remains in a guaranteed valid logic state (high during reset, low otherwise) throughout that range. This ensures deterministic reset behavior during brownout, battery discharge, or power-fail scenarios where VCC may collapse slowly from 2.5V to 1.0V, preventing premature μP release before supply stabilization.

How does the MAX6385XS25D7-T differ from other members of the MAX6381–MAX6390 family, such as MAX6385XS25D3-T?

The MAX6385XS25D7-T differs from MAX6385XS25D3-T solely in its reset timeout period: D7 denotes 1200ms minimum VCC reset timeout, whereas D3 specifies 140ms. Both share identical +2.50V threshold, 4-pin SC70 package, active-high push-pull output, and MR functionality. Selection depends strictly on system-level reset timing requirements - e.g., D7 for processors needing longer initialization windows, D3 for fast-boot applications.