Analog Devices Inc./Maxim Integrated MAX6385XS24D2-T

Overview

MAX6385XS24D2-T from Maxim Integrated is a micropower voltage supervisor IC with active-high push-pull reset output, factory-set 2.40V ±2.5% reset threshold, and 20ms minimum reset timeout period. It monitors VCC from +1.8V to +5.0V while drawing only 3μA at +1.8V, and guarantees valid reset state down to VCC = 1V. It is used in battery-powered microcontroller systems requiring reliable power-on reset and brownout protection.

For engineers reviewing the MAX6385XS24D2-T datasheet, MAX6385XS24D2-T pinout, MAX6385XS24D2-T application, or MAX6385XS24D2-T equivalent, key selection criteria include reset threshold accuracy over temperature (±2.5% from –40°C to +125°C), manual reset input with internal 63kΩ pullup, 4-pin SC70 package footprint, and compatibility with dual-voltage monitoring architectures where auxiliary reset inputs are not required.

Technical Context

The MAX6385XS24D2-T implements a precision bandgap-based voltage comparator with hysteresis to detect VCC falling below 2.40V, triggering an active-high push-pull RESET signal that remains asserted for ≥20ms after VCC recovers above threshold. Its internal timer is RC-based and calibrated for stable timeout across temperature.

It features a debounced manual reset input (MR) with TTL/CMOS-compatible logic levels and internal 63kΩ pullup resistor, enabling external switch or logic-driven reset assertion without external components. The device operates across full industrial temperature range (–40°C to +125°C) and supports supply voltages as low as 1.0V while maintaining guaranteed reset output validity.

Key Specifications

Pinout & Package

MAX6385XS24D2-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, with pins arranged in standard SC70 top-view configuration.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar voltage supervisor applications.

Compared with MAX6385LT24D2-T, the MAX6385XS24D2-T offers smaller footprint and better thermal performance on multilayer boards; compared with TPS3808G125DBVR, it provides precise 2.40V detection and MR functionality essential for field-serviceable designs.

Availability

MAX6385XS24D2-T is available at Aetrix Electronics and suitable for portable/battery-powered equipment, industrial controllers, and critical microprocessor power monitoring requiring stable component supply and long-term production continuity.

Supply support for MAX6385XS24D2-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 management, sensing, and interface applications, with emphasis on low-power, high-reliability solutions.

The MAX6381–MAX6390 family delivers single- and dual-supply voltage supervisors optimized for micropower operation, wide temperature range, and minimal board area - targeting battery-powered, automotive, and industrial embedded systems.

FAQ

What is the exact reset threshold voltage of the MAX6385XS24D2-T and how does it vary with temperature?

The MAX6385XS24D2-T has a factory-set nominal reset threshold of 2.40V, with guaranteed tolerance of ±2.5% over the full operating temperature range of –40°C to +125°C. This means the actual threshold falls between 2.34V and 2.46V at any temperature within that range. The tempco is specified at 60ppm/°C, contributing to tight drift control. This precision eliminates need for external calibration in MAX6385XS24D2-T-based designs.

Does the MAX6385XS24D2-T support manual reset, and what are the electrical requirements for the MR pin?

Yes, the MAX6385XS24D2-T includes a debounced manual reset input (MR) with an internal 63kΩ pullup resistor to VCC. To assert reset, MR must be driven low to ≤0.3×VCC (e.g., ≤0.72V at VCC = 2.4V). The minimum pulse width is 1µs, and glitch rejection is 100ns. Leaving MR unconnected defaults it to high via the internal pullup, making MAX6385XS24D2-T ready for use without external components.

What package type and dimensions does the MAX6385XS24D2-T use, and is it RoHS-compliant?

The MAX6385XS24D2-T is supplied in a 4-pin SC70 package (outline number 21-0098), measuring 2.0mm × 2.1mm × 0.95mm with 0.65mm pin pitch. It carries the "+T" suffix indicating lead(Pb)-free and RoHS-compliant construction. Land pattern number 90-0187 applies, and thermal resistance is θJA = 322.6°C/W on a multilayer board - confirmed in Maxim's official package documentation for MAX6385XS24D2-T.

Can the MAX6385XS24D2-T operate reliably at VCC = 1.0V, and what is its reset output behavior at that voltage?

Yes, the MAX6385XS24D2-T guarantees correct reset output logic state down to VCC = 1.0V. At this voltage, the active-high push-pull RESET output remains functional: it asserts high during reset and deasserts low afterward, with VOL ≤0.3V at ISINK = 80µA. This ensures deterministic microcontroller behavior during ultra-low-voltage wake-up or battery end-of-life conditions - a key specification explicitly guaranteed for MAX6385XS24D2-T.

How does the reset timeout period of the MAX6385XS24D2-T compare to other members of the MAX6381–MAX6390 family?

The MAX6385XS24D2-T has a 20ms minimum reset timeout period (denoted by "D2" in the part number), matching the D2 option across the MAX6381–MAX6390 family. Other standard timeouts include 1ms (D1), 140ms (D3), 280ms (D5), 560ms (D6), 1120ms (D4), and 1200ms (D7). Unlike MAX6390, which offers asymmetric MR/VCC timeouts, MAX6385XS24D2-T uses the same 20ms period for both VCC recovery and MR release - confirmed in the Reset Timeout Delay table of the MAX6385XS24D2-T datasheet.