Analog Devices Inc./Maxim Integrated MAX6386LT22D3+T

Overview

MAX6386LT22D3+T from Maxim Integrated is a low-power microprocessor supervisory circuit with open-drain active-low reset output, manual reset input (MR), and factory-set 2.19V reset threshold (±2.5% over -40°C to +125°C), 140ms minimum VCC reset timeout, and 3μA supply current at +1.8V. It monitors single-supply rails in battery-powered embedded systems requiring reliable power-on reset and brownout protection.

For engineers reviewing the MAX6386LT22D3+T datasheet, MAX6386LT22D3+T pinout, MAX6386LT22D3+T application, or MAX6386LT22D3+T equivalent, key selection criteria include its open-drain reset architecture, MR debouncing capability, guaranteed reset validity down to VCC = 1V, and compatibility with dual-voltage monitoring designs using external resistor dividers.

Technical Context

The MAX6386LT22D3+T implements a precision voltage comparator with internal 2.19V reference and hysteresis-free threshold detection, paired with a monostable timer for fixed 140ms reset assertion after VCC recovery. Its MR input features an internal 63kΩ pullup resistor and 1µs minimum pulse width support, enabling direct switch or logic-level reset initiation without external components.

As part of the MAX6381–MAX6390 family, it shares BiCMOS process technology and AEC-Q100-qualified variants, but differs from MAX6387–MAX6389 by omitting RESET IN functionality and from MAX6390 by using standard MR timeout (not shortened 140ms/150ms dual-timing). It operates across 1.0V–5.5V VCC and guarantees reset state integrity down to 1V supply.

Key Specifications

Pinout & Package

MAX6386LT22D3+T is housed in a RoHS-compliant 4-pin SC70 package (package code X4+1), measuring 2.0mm × 2.1mm × 0.95mm, with exposed pad for thermal enhancement and standard JEDEC land pattern 90-0187.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6386LT22D3+T, the /V+T variant adds automotive qualification without altering timing or interface behavior, while MAX6326LTR22D3+T sacrifices MR and open-drain capability for reduced cost and simpler integration in single-function reset roles.

Availability

MAX6386LT22D3+T is available at Aetrix Electronics and suitable for portable medical sensors, industrial PLC I/O modules, automotive body control units, and dual-voltage microcontroller systems requiring stable component supply with short lead times and consistent quality.

Supply support for MAX6386LT22D3+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, with emphasis on low-power, high-reliability solutions.

MAX6386LT22D3+T belongs to the MAX6381–MAX6390 family of microprocessor supervisory circuits engineered for ultra-low-power, single-rail voltage monitoring in space-constrained and battery-sensitive systems.

FAQ

What is the exact reset threshold voltage of MAX6386LT22D3+T and how accurate is it over temperature?

The MAX6386LT22D3+T has a factory-set nominal reset threshold of 2.19V, with guaranteed accuracy of ±2.5% over the full operating temperature range of -40°C to +125°C. This specification is confirmed in the Electrical Characteristics table under "VCC Reset Threshold" and applies to all units regardless of batch or date code. The MAX6386LT22D3+T achieves this stability via laser-trimmed on-chip references and BiCMOS process optimization.

Does MAX6386LT22D3+T support manual reset, and what are the electrical requirements for the MR pin?

Yes, MAX6386LT22D3+T includes a debounced manual reset input (MR) with an internal 63kΩ pullup resistor to VCC. To assert reset, drive MR below 0.3×VCC (for VTH < 4V) for ≥1µs; the device guarantees 100ns glitch rejection. MR requires no external components and accepts TTL/CMOS logic levels. The MAX6386LT22D3+T maintains reset assertion for the full 140ms timeout after MR is released.

What package type and dimensions does MAX6386LT22D3+T use, and is it RoHS-compliant?

MAX6386LT22D3+T uses a 4-pin SC70 package (code X4+1), measuring 2.0mm × 2.1mm × 0.95mm with gull-wing leads and an exposed thermal pad. It is RoHS-compliant and Pb-free, indicated by the "+T" suffix per Maxim's ordering conventions. The land pattern follows JEDEC standard 90-0187, and the package is rated for reflow soldering up to +260°C peak temperature.

Can MAX6386LT22D3+T monitor a second voltage rail, and if not, what is the alternative?

No, MAX6386LT22D3+T does not support auxiliary voltage monitoring - it lacks the RESET IN pin required for dual-rail supervision. For that functionality, select MAX6387LT22D3+T or MAX6389LT22D3+T, which include a dedicated RESET IN terminal compared to the MAX6386LT22D3+T. These alternatives retain identical reset threshold, timeout, and package but add a high-impedance comparator input referenced to +1.27V.

What is the minimum supply voltage at which MAX6386LT22D3+T guarantees correct reset output behavior?

MAX6386LT22D3+T guarantees valid reset output logic state down to VCC = 1.0V, as specified in the Absolute Maximum Ratings and Electrical Characteristics tables. Below 1.0V, the device may not maintain defined output behavior; however, the reset output remains asserted (low for open-drain) until VCC drops below the functional limit. This feature ensures deterministic failure mode during deep brownout, critical for safety-critical MAX6386LT22D3+T deployments.