Analog Devices Inc./Maxim Integrated MAX6386XS29D3+T

Overview

MAX6386XS29D3+T from Maxim Integrated is a low-power microprocessor supervisory circuit with open-drain active-low reset output, factory-set 2.93V 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 voltage in battery-powered embedded systems requiring reliable power-on reset and brownout protection.

For engineers reviewing the MAX6386XS29D3+T datasheet, MAX6386XS29D3+T pinout, MAX6386XS29D3+T application, or MAX6386XS29D3+T equivalent, key selection criteria include its 2.93V threshold accuracy, 140ms reset hold time, MR debounce capability, open-drain output compatibility with mixed-voltage logic, and operation down to VCC = 1.0V.

Technical Context

The MAX6386XS29D3+T implements a precision bandgap-based reset comparator with ±2.5% threshold tolerance across –40°C to +125°C and 60ppm/°C tempco. Its internal timer guarantees minimum 140ms reset assertion after VCC recovers above 2.93V.

It features a dedicated active-low manual reset input (MR) with internal 63kΩ pullup resistor, supporting TTL/CMOS-compatible triggering and eliminating external debounce components. The open-drain RESET output requires an external pullup and remains valid down to VCC = 1.0V.

Key Specifications

Pinout & Package

MAX6386XS29D3+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 space-constrained PCB layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6386XS29D3+T, MAX6326XR29D3+T simplifies output interfacing but removes manual reset capability, while TPS3808G33DBVR offers superior threshold precision and watchdog functionality at the cost of increased pin count, power, and design overhead.

Availability

MAX6386XS29D3+T is available at Aetrix Electronics and suitable for industrial PLC power monitoring, medical wearable boot supervision, automotive body control modules, smart home sensor nodes, and battery-powered instrumentation requiring stable component supply and long-term lifecycle support.

Supply support for MAX6386XS29D3+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 microprocessor supervisory circuits optimized for battery-operated and thermally harsh environments, with factory-trimmed thresholds, multiple timeout options, and flexible reset output configurations.

FAQ

What is the exact reset threshold voltage of the MAX6386XS29D3+T and how stable is it over temperature?

The MAX6386XS29D3+T has a factory-set nominal reset threshold of 2.93V, with guaranteed tolerance of ±2.5% over the full operating temperature range of –40°C to +125°C. Its reset comparator exhibits a tempco of 60ppm/°C, ensuring minimal drift during thermal cycling. This stability is confirmed in the Electrical Characteristics table and Typical Operating Characteristics plots (toc04) of the official datasheet.

Does the MAX6386XS29D3+T support manual reset, and what are the electrical requirements for the MR pin?

Yes, the MAX6386XS29D3+T includes a debounced manual reset input (MR) with an internal 63kΩ pullup resistor to VCC. The MR pin accepts TTL- or CMOS-compatible logic levels: VIH ≥ 0.7×VCC (for VTH < 4V) and VIL ≤ 0.3×VCC. A minimum 1µs low pulse width is required to trigger reset, and MR remains active for the full 140ms timeout after release. No external components are needed for basic switch interfacing.

What is the output configuration of the RESET pin on the MAX6386XS29D3+T, and what external components are required?

The RESET pin on the MAX6386XS29D3+T is an open-drain active-low output. It requires an external pullup resistor to a logic rail (e.g., 1.8V, 3.3V, or 5V) to establish the high state. The device can sink up to 3.2mA when asserted at VCC ≥ 4.5V. Recommended pullup values range from 10kΩ to 100kΩ depending on rise time and bus loading requirements - no pullup is needed if using a push-pull alternative like MAX6326.

Can the MAX6386XS29D3+T operate reliably at very low supply voltages, and what is its minimum functional VCC?

Yes, the MAX6386XS29D3+T guarantees correct reset output logic state down to VCC = 1.0V, enabling reliable supervision during deep brownout conditions. Its supply current remains ultra-low (3μA at 1.8V), and internal comparators remain functional even as VCC approaches 1.0V. However, the RESET output is only guaranteed valid down to VCC = 1.0V - operation below this voltage is not specified and may result in undefined behavior.

Is the MAX6386XS29D3+T pin-compatible with other members of the MAX6381–MAX6390 family, and which packages does it use?

The MAX6386XS29D3+T uses the 4-pin SC70 package (outline 21-0098), sharing pinout compatibility with other XS-suffixed variants (e.g., MAX6384XSxxDx+T, MAX6385XSxxDx+T). It is not pin-compatible with 3-pin SC70 or 6-pin μDFN versions. Within the 4-pin SC70 group, all devices share identical VCC-GND-MR-RESET pin assignments, allowing direct substitution where reset threshold and timeout match application requirements.