Analog Devices Inc./Maxim Integrated MAX6385XS44D6-T

Overview

MAX6385XS44D6-T from Maxim Integrated is a low-power microprocessor supervisory circuit with active-high push-pull reset output, factory-set 4.38V reset threshold (±2.5% over -40°C to +125°C), and 560ms minimum VCC reset timeout. It monitors single supply voltage in battery-powered or embedded systems and guarantees valid reset state down to VCC = 1V. Designed for critical μP power-up sequencing in portable equipment.

For engineers reviewing the MAX6385XS44D6-T datasheet, MAX6385XS44D6-T pinout, MAX6385XS44D6-T application, or MAX6385XS44D6-T equivalent, key selection criteria include its 4-pin SC70 package, manual reset input with internal pullup, ±2.5% threshold accuracy over temperature, and compatibility with dual-voltage monitoring systems requiring precise brownout detection.

Technical Context

The MAX6385XS44D6-T implements a precision bandgap-based voltage comparator with 60ppm/°C tempco to detect VCC falling below 4.38V, triggering an active-high reset that remains asserted for ≥560ms after VCC recovers. Its internal timer ensures deterministic reset hold time independent of supply ramp rate.

A debounced manual reset input (MR) with 63kΩ internal pullup allows external initiation of reset; MR-to-reset delay is 200ns, and MR pulse width rejection is ≥1µs. Reset output remains valid at VCC as low as 1.0V, supporting operation during deep brownout conditions.

Key Specifications

Pinout & Package

MAX6385XS44D6-T is housed in a 4-pin SC70 package (outline 21-0098, land pattern 90-0187), measuring 2.0mm × 2.1mm × 0.95mm, with RoHS-compliant lead-free finish.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6385LT44D6-T, the MAX6385XS44D6-T saves 0.5mm² board area and improves thermal response; versus MAX809TRD3-T, it adds MR support and doubles reset timeout - critical for systems requiring firmware integrity during extended brownout.

Availability

MAX6385XS44D6-T is available at Aetrix Electronics and suitable for portable medical sensors, battery-powered data loggers, industrial PLC I/O modules, and automotive body control units requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MAX6385XS44D6-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 connectivity in demanding industrial, automotive, and medical applications.

The MAX6381–MAX6390 family delivers ultra-low-power, high-accuracy reset supervision for microprocessors in battery-critical and thermally harsh environments - emphasizing guaranteed operation down to 1V and AEC-Q100 qualification.

FAQ

What is the exact reset threshold voltage of the MAX6385XS44D6-T?

The MAX6385XS44D6-T has a factory-set nominal reset threshold of 4.38V, with guaranteed tolerance of ±2.5% over the full operating temperature range (-40°C to +125°C). This value is confirmed in the Reset Thresholds table of the official datasheet, where suffix "44" corresponds to 4.27V (min), 4.38V (nom), and 4.48V (max) at +25°C, and ±2.5% applies across temperature.

Does the MAX6385XS44D6-T support manual reset functionality?

Yes, the MAX6385XS44D6-T includes a debounced manual reset input (MR) with an internal 63kΩ pullup resistor to VCC. Driving MR low for ≥1µs forces an active-high reset assertion, which remains active for the full 560ms timeout period after MR is released. This feature is explicitly documented in the Pin Description and Features sections of the datasheet.

What package type and dimensions does the MAX6385XS44D6-T use?

The MAX6385XS44D6-T uses a 4-pin SC70 package (outline number 21-0098, land pattern 90-0187), measuring 2.0mm × 2.1mm × 0.95mm. This is confirmed in the Ordering Information table, where "XS" denotes the 4-pin SC70 variant, and package thermal data lists θJA = 322.6°C/W for this configuration.

Can the MAX6385XS44D6-T operate reliably at very low supply voltages?

Yes, the MAX6385XS44D6-T guarantees correct reset output logic state down to VCC = 1.0V, as stated in both the Absolute Maximum Ratings and Detailed Description sections. This ensures deterministic behavior during deep brownout or battery-depletion scenarios where other supervisors may fail to assert reset.

Is the MAX6385XS44D6-T qualified for automotive applications?

The base MAX6385XS44D6-T is not automotive-qualified; however, the /V variant (e.g., MAX6385XS44D6/V+T) is AEC-Q100 qualified. The datasheet explicitly states "AEC-Q100 Qualified, Refer to Ordering Information for the Specific /V Trim Version", and the Ordering Information table lists /V+T suffixes for SC70 and μDFN packages.