Analog Devices Inc./Maxim Integrated MAX6385XS38D3-T

Overview

MAX6385XS38D3-T from Maxim Integrated is a low-power, active-high push-pull μP supervisory circuit designed to monitor +3.80V supply rails in space-constrained embedded systems. It asserts reset when VCC falls below 3.80V (±2.5% over −40°C to +125°C), guarantees valid output down to VCC = 1V, features a 140ms minimum reset timeout, and includes a debounced manual reset input (MR) with internal 63kΩ pullup. It is used in battery-powered controllers requiring reliable power-on reset and brownout protection.

For engineers reviewing the MAX6385XS38D3-T datasheet, MAX6385XS38D3-T pinout, MAX6385XS38D3-T application, or MAX6385XS38D3-T equivalent, key selection criteria include its factory-trimmed 3.80V threshold, 140ms VCC reset timeout, MR input timing behavior, SC70-4 package footprint, and compatibility with 1.8V–5.5V system supplies.

Technical Context

The MAX6385XS38D3-T implements a precision bandgap-based voltage comparator with ±2.5% threshold accuracy across −40°C to +125°C and 60ppm/°C tempco. Its internal timer generates a guaranteed-minimum 140ms reset assertion after VCC recovers above 3.80V or after MR release.

It uses an active-high push-pull RESET output capable of sourcing 800µA at VCC ≥ 4.5V (VOH ≥ 0.8×VCC) and sinking 3.2mA (VOL ≤ 0.4V), with logic state validity ensured down to VCC = 1V. The MR input accepts TTL/CMOS levels and features 100ns glitch rejection and 1µs minimum pulse width support.

Key Specifications

Pinout & Package

MAX6385XS38D3-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 MAX6385XS38D3-T, MAX6385XS38D2-T offers faster reset deassertion but less margin for slow-starting peripherals, while MAX6326XR38D3-T sacrifices MR and active-high drive for reduced cost and simpler interface-neither is pin-compatible, requiring PCB layout changes.

Availability

MAX6385XS38D3-T is available at Aetrix Electronics and suitable for industrial PLC controllers, automotive body control modules, portable medical monitors, and smart energy meters requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for MAX6385XS38D3-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, emphasizing low power, high reliability, and small form factor.

The MAX6381–MAX6390 family delivers ultra-low-power, factory-trimmed μP supervisors targeting space- and energy-constrained embedded systems requiring guaranteed reset behavior across harsh environmental conditions.

FAQ

What is the exact reset threshold voltage of the MAX6385XS38D3-T?

The MAX6385XS38D3-T has a factory-trimmed nominal reset threshold of +3.80V, with guaranteed tolerance of ±2.5% over the full operating temperature range of −40°C to +125°C. This value is confirmed in the Reset Thresholds table of the datasheet and applies specifically to the "38" suffix in the part number.

Does the MAX6385XS38D3-T support manual reset, and how is it implemented?

Yes, the MAX6385XS38D3-T includes a debounced manual reset input (MR) on Pin 3. It features an internal 63kΩ pullup resistor to VCC, so it can be left unconnected when unused. Driving MR low forces reset assertion, which remains active for the full 140ms timeout after MR is released. The MR input rejects glitches <100ns and requires a minimum pulse width of 1µs.

What package type and dimensions does the MAX6385XS38D3-T use?

The MAX6385XS38D3-T is supplied in a lead(Pb)-free, RoHS-compliant 4-pin SC70 package (outline number 21-0098). Its footprint measures 2.0mm × 2.1mm, with a maximum height of 0.95mm. Land pattern number 90-0187 defines the recommended PCB pad layout for reliable reflow soldering.

How does the MAX6385XS38D3-T behave when VCC drops below 1.0V?

The MAX6385XS38D3-T guarantees correct RESET output logic state only down to VCC = 1.0V. Below this voltage, the internal circuitry cannot maintain defined output behavior. For applications requiring valid reset signaling all the way to 0V, external pullup/pulldown resistors are needed-but note that this technique is not applicable to open-drain variants and is unnecessary for the MAX6385XS38D3-T's push-pull output in most designs.

Is the MAX6385XS38D3-T qualified for automotive applications?

The MAX6385XS38D3-T is not explicitly marked with the /V automotive qualification suffix in its ordering code and is not listed in the AEC-Q100–qualified versions table. While it operates across −40°C to +125°C and meets many automotive electrical requirements, formal AEC-Q100 qualification applies only to designated /V-trim versions such as MAX6385XS38D3/V+T. Use the /V version for production automotive systems.