Analog Devices Inc./Maxim Integrated MAX6386XS31D5+T

Overview

MAX6386XS31D5+T from Maxim Integrated is an open-drain active-low microprocessor supervisory circuit with factory-set 3.08V reset threshold, 280ms minimum VCC reset timeout, and debounced manual reset input (MR). It operates from +1.0V to +5.5V supply, consumes only 3μA at +1.8V, and guarantees valid reset output down to VCC = 1V. It is used in battery-powered embedded controllers to prevent code execution during brownout.

For engineers reviewing the MAX6386XS31D5+T datasheet, MAX6386XS31D5+T pinout, MAX6386XS31D5+T application, or MAX6386XS31D5+T equivalent, key selection criteria include reset threshold accuracy (±2.5% over –40°C to +125°C), MR input pullup resistance (63kΩ), open-drain sink capability (3.2mA @ VCC ≥ 4.5V), and SC70-4 package compatibility with space-constrained portable designs.

Technical Context

The MAX6386XS31D5+T implements a precision voltage comparator monitoring VCC against a trimmed internal reference, with hysteresis and temperature-compensated threshold (60ppm/°C tempco). Its internal timer initiates a fixed 280ms reset assertion window after VCC recovers above 3.08V or after MR release.

It features a dedicated active-low manual reset input (MR) with internal 63kΩ pullup, supporting TTL/CMOS logic drive and requiring no external debounce. The open-drain RESET output mandates an external pullup resistor and supports wired-OR configurations in multi-rail systems.

Key Specifications

Pinout & Package

MAX6386XS31D5+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 microprocessor reset applications.

Compared with MAX6386XS31D5+T, MAX809TRD3+T offers smaller size but omits MR, while TPS3808G30DBVR adds voltage flexibility at the cost of larger footprint and incompatible pin mapping-making MAX6386XS31D5+T optimal for space-constrained, MR-requiring 3.3V systems.

Availability

MAX6386XS31D5+T is available at Aetrix Electronics and suitable for battery-powered medical sensors, industrial PLC I/O modules, automotive body control units, and portable test equipment requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MAX6386XS31D5+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 industrial, automotive, communications, and computing markets, emphasizing low-power, high-reliability solutions.

The MAX6381–MAX6390 family delivers ultra-low-power, factory-trimmed reset supervision for microprocessor-based systems where supply stability, small footprint, and guaranteed reset behavior across temperature are critical.

FAQ

What is the exact reset threshold voltage of the MAX6386XS31D5+T?

The MAX6386XS31D5+T has a factory-set nominal reset threshold of 3.08V, 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 datasheet, where suffix "31" corresponds to VTH(nom) = 3.08V. The MAX6386XS31D5+T uses this precise threshold to reliably detect brownout on standard 3.3V rails.

Does the MAX6386XS31D5+T support manual reset, and how is it implemented?

Yes, the MAX6386XS31D5+T includes a debounced manual reset input (MR) on Pin 3. It features an internal 63kΩ pullup resistor to VCC, allowing direct connection of a normally open momentary switch between MR and GND. A low pulse on MR forces reset assertion for the full 280ms timeout period after release. The MAX6386XS31D5+T does not require external RC filtering due to built-in 100ns glitch rejection.

What package type and dimensions does the MAX6386XS31D5+T use?

The MAX6386XS31D5+T is supplied in a lead-free, RoHS-compliant 4-pin SC70 package (outline number 21-0098, land pattern 90-0187), measuring 2.0mm × 2.1mm × 0.95mm. This compact footprint is pin-compatible with other SC70-4 supervisory circuits and supports reflow soldering per JEDEC J-STD-020. The MAX6386XS31D5+T's SC70-4 package enables high-density placement in portable and wearable electronics.

Can the MAX6386XS31D5+T operate down to 1.0V supply, and what happens to RESET output?

Yes, the MAX6386XS31D5+T guarantees correct RESET output logic state down to VCC = 1.0V, as specified in Absolute Maximum Ratings and Electrical Characteristics. Below ~1.8V, the open-drain RESET output remains functional with reduced sink current (80µA min at VCC ≥ 1.0V), ensuring deterministic reset assertion during deep brownout. The MAX6386XS31D5+T maintains this behavior without requiring external biasing components.

Is the MAX6386XS31D5+T AEC-Q100 qualified, and what versions carry automotive qualification?

The MAX6386XS31D5+T itself is not automotive-qualified; only variants with "/V" suffix (e.g., MAX6386XS31D5/V+T) are AEC-Q100 qualified. The "+T" suffix indicates tape-and-reel packaging and RoHS compliance, but does not imply automotive qualification. For automotive applications, designers must select the /V version-confirmed in the Ordering Information table-and verify that the specific "XS31D5" combination is listed in the /V trim versions. The MAX6386XS31D5+T is intended for industrial and commercial use.