Analog Devices Inc./Maxim Integrated MAX6386XS24D3-T

Overview

MAX6386XS24D3-T from Maxim Integrated is a low-power microprocessor supervisory circuit with open-drain active-low reset output, factory-set 2.4V reset threshold (±2.5% over -40°C to +125°C), 140ms minimum VCC reset timeout, and debounced manual reset input (MR) with internal 63kΩ pullup. It monitors single-supply systems in battery-powered instrumentation and embedded controllers where reliable power-on reset and brownout protection are critical.

For engineers reviewing the MAX6386XS24D3-T datasheet, MAX6386XS24D3-T pinout, MAX6386XS24D3-T application, or MAX6386XS24D3-T equivalent, key selection criteria include its 2.4V threshold accuracy, 140ms reset timeout, MR debounce capability, open-drain output requiring external pullup, and guaranteed valid reset state down to VCC = 1V - all in a space-constrained 4-pin SC70 package.

Technical Context

The MAX6386XS24D3-T implements a precision bandgap-based voltage comparator monitoring VCC against a fixed 2.4V threshold, with ±2.5% tolerance over full industrial temperature range. Its internal timer initiates a 140ms minimum reset assertion period upon VCC drop below threshold or MR activation.

Reset assertion is sustained for the full timeout regardless of transient recovery; the open-drain RESET output requires an external pullup resistor and sinks up to 3.2mA at VCC ≥ 4.5V. The MR input accepts TTL/CMOS logic levels and features internal debouncing via RC filtering, eliminating need for external components.

Key Specifications

Pinout & Package

MAX6386XS24D3-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, optimized 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 MAX6386XS24D3-T, MAX6326XR24D3+T simplifies BOM by eliminating the pullup resistor but removes MR functionality, while TPS3808G125DBVR offers superior threshold precision and lower current at the cost of increased complexity and lack of integrated MR pullup - making MAX6386XS24D3-T optimal for cost-sensitive, MR-dependent, space-constrained designs.

Availability

MAX6386XS24D3-T is available at Aetrix Electronics and suitable for portable medical sensors, industrial PLC I/O modules, automotive body control units, and smart energy meters requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MAX6386XS24D3-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 factors.

The MAX6381–MAX6390 family delivers ultra-low-power microprocessor supervisory circuits targeting battery-operated and thermally challenging systems where deterministic reset behavior and minimal quiescent current are essential design requirements.

FAQ

What is the exact reset threshold voltage and tolerance for MAX6386XS24D3-T?

The MAX6386XS24D3-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 specification is confirmed in the Electrical Characteristics table under "VCC Reset Threshold" and applies directly to the MAX6386XS24D3-T variant per the Reset Threshold Suffix "24" in the ordering guide.

Does MAX6386XS24D3-T require an external pullup resistor on the RESET pin?

Yes, MAX6386XS24D3-T features an open-drain active-low RESET output and requires an external pullup resistor to the appropriate logic rail (e.g., 3.3V or 5V). The datasheet specifies that the RESET pin sinks up to 3.2mA when asserted at VCC ≥ 4.5V, so the pullup value must be selected to ensure proper voltage levels under worst-case sink current and noise margin requirements.

What is the function and electrical behavior of the MR pin on MAX6386XS24D3-T?

The MR pin on MAX6386XS24D3-T is an active-low manual reset input with an internal 63kΩ pullup resistor to VCC. Driving MR to GND forces a reset for the duration of the low signal plus the full 140ms timeout. The pin accepts standard TTL/CMOS logic levels and includes internal debounce, eliminating the need for external RC filtering in most applications.

Can MAX6386XS24D3-T operate reliably when VCC drops below 1.8V?

Yes, MAX6386XS24D3-T is guaranteed to maintain valid reset output logic states down to VCC = 1.0V, as specified in the Absolute Maximum Ratings and Electrical Characteristics tables. Its 3μA supply current at 1.8V and functional operation at 1.0V make it suitable for deep-brownout scenarios common in battery-depleted portable equipment.

What package type and dimensions does MAX6386XS24D3-T use?

MAX6386XS24D3-T is packaged in a lead(Pb)-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 explicitly listed in the Ordering Information table for MAX6386XS_ _D_+T variants and validated in the Pin Configurations section.