Analog Devices Inc./Maxim Integrated MAX6386XS17D3-T

Overview

MAX6386XS17D3-T from Maxim Integrated is a low-power microprocessor supervisory circuit with open-drain active-low reset output, factory-set 1.67V 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 MAX6386XS17D3-T datasheet, MAX6386XS17D3-T pinout, MAX6386XS17D3-T application, or MAX6386XS17D3-T equivalent, key selection criteria include reset threshold accuracy at temperature extremes, guaranteed reset assertion down to VCC = 1V, open-drain output compatibility with mixed-voltage logic domains, and MR pulse width immunity to noise-induced false triggers.

Technical Context

The MAX6386XS17D3-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 generates a fixed 140ms minimum reset timeout after VCC rises above 1.67V or after MR release.

It features an open-drain RESET output requiring external pullup, a debounced MR input tolerant of sub-1µs glitches, and guaranteed valid reset state for VCC ≥ 1.0V - enabling operation during deep brownout conditions where many competitors fail.

Key Specifications

Pinout & Package

MAX6386XS17D3-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 space-constrained portable designs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6386XS17D3-T, MAX6326XR17D3+T simplifies layout by eliminating the pullup resistor but removes manual reset capability, while TPS3123E17DBVR adds watchdog supervision at the cost of 4× higher quiescent current and external MR biasing - making MAX6386XS17D3-T optimal for ultra-low-power, MR-dependent applications.

Availability

MAX6386XS17D3-T is available at Aetrix Electronics and suitable for portable medical sensors, industrial PLC I/O modules, smart meter battery backup systems, and automotive body control units requiring stable component supply with guaranteed long-term availability.

Supply support for MAX6386XS17D3-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 medical applications, emphasizing low power, high reliability, and small form factor.

The MAX6381–MAX6390 family delivers single-supply microprocessor supervisory circuits optimized for battery-powered and energy-sensitive systems where reset accuracy, ultra-low ICC, and robust MR functionality are critical.

FAQ

What is the exact reset threshold voltage of the MAX6386XS17D3-T and how does it vary with temperature?

The MAX6386XS17D3-T has a factory-set nominal reset threshold of 1.67V, with guaranteed limits of 1.62V (min) and 1.71V (max) at +25°C. Over the full operating range of -40°C to +125°C, the threshold remains within ±2.5% of nominal (i.e., 1.62V to 1.71V), with a tempco of 60ppm/°C - resulting in less than 15mV total drift across temperature. This specification is confirmed in the Electrical Characteristics table of the official datasheet.

Does the MAX6386XS17D3-T require an external pullup resistor on the RESET pin?

Yes, the MAX6386XS17D3-T features an open-drain active-low RESET output, which requires an external pullup resistor to the target logic voltage (e.g., 1.8V, 3.3V, or 5V). The datasheet specifies that the RESET pin sinks up to 3.2mA when asserted (VCC ≥ 4.5V), so a typical 10kΩ pullup provides sufficient margin while limiting current draw. No internal pullup exists on the RESET pin - only on the MR input.

What is the minimum VCC voltage at which the MAX6386XS17D3-T guarantees correct RESET output behavior?

The MAX6386XS17D3-T guarantees valid RESET output state (correct logic level and timing) down to VCC = 1.0V, as explicitly stated in the Absolute Maximum Ratings and Electrical Characteristics sections. Below 1.0V, operation is not specified. This feature ensures reliable brownout detection and controlled shutdown in ultra-low-voltage scenarios such as end-of-life battery conditions.

Can the MR input of the MAX6386XS17D3-T be left floating, or must it be terminated?

The MR input of the MAX6386XS17D3-T must not be left floating: it contains an internal 63kΩ pullup resistor to VCC, so the safe default is to leave it unconnected if unused. Driving MR low (≤0.3×VCC) asserts reset; releasing it allows the internal pullup to return MR high after debounce. Floating MR could pick up noise and cause unintended resets - termination is inherent via the internal resistor, eliminating need for external components.

Is the MAX6386XS17D3-T pin-compatible with older Maxim reset ICs like the MAX809?

Yes, the MAX6386XS17D3-T is pin-compatible with MAX809/MAX810/MAX803 and other members of the MAX6326–MAX6348 series in the same 4-pin SC70 package. Pin 1 = VCC, Pin 2 = RESET, Pin 3 = MR, Pin 4 = GND - matching the footprint and signal assignment. However, note that MAX809 lacks MR input and uses push-pull output, so system-level reset net design must account for open-drain vs. push-pull behavior.