Analog Devices Inc./Maxim Integrated MAX6386XS46D3

Overview

The MAX6386XS46D3 from Maxim Integrated is a low-power, open-drain active-low microprocessor supervisory circuit with factory-set 4.63V reset threshold, 140ms minimum reset timeout, and debounced manual reset input. It monitors VCC in systems requiring precise brownout detection and reliable power-on reset for critical µP/µC applications operating from +1.8V to +5.0V supply rails.

For engineers reviewing the MAX6386XS46D3 datasheet, MAX6386XS46D3 pinout, MAX6386XS46D3 application, or MAX6386XS46D3 equivalent, key selection considerations include its 4-pin SC70 package, ±2.5% reset threshold accuracy over -40°C to +125°C, guaranteed valid reset output down to VCC = 1V, 3µA supply current at +1.8V, and compatibility with manual reset switch interfaces without external debounce circuitry.

Technical Context

The MAX6386XS46D3 implements a precision bandgap-based voltage comparator with internal 4.63V threshold (±2.5% over temperature), paired with a monolithic timer generating a fixed 140ms minimum reset assertion period after VCC recovery. Its open-drain RESET output requires an external pullup and remains asserted during VCC brownout, power-up, or manual MR activation.

It features a dedicated active-low manual reset input (MR) with internal 63kΩ pullup resistor, enabling direct connection to a momentary switch to GND. The device guarantees correct logic state of RESET down to VCC = 1V and provides immunity to negative-going VCC transients up to 35µs at 100mV overdrive, per typical operating characteristics.

Key Specifications

Pinout & Package

MAX6386XS46D3 is housed in a 4-pin SC70 package (package code X4-1), measuring 1.0mm × 1.0mm × 0.5mm, with wettable flank leads for automated optical inspection. Pin 1 is RESET (active-low open-drain), Pin 2 is VCC, Pin 3 is MR (manual reset input), and Pin 4 is GND.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6326XR46D3, MAX6386XS46D3 adds essential manual reset capability and open-drain flexibility at the cost of slightly higher supply current; versus TPS3808G33DBVR, it delivers exact 4.63V threshold compliance and proven industrial temperature stability without introducing watchdog complexity.

Availability

MAX6386XS46D3 is available at Aetrix Electronics and suitable for industrial PLC controller power monitoring, medical infusion pump microcontroller reset, and automotive body control module subsystems requiring stable component supply and long-lifecycle support.

Supply support for MAX6386XS46D3 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 high-performance analog and mixed-signal semiconductor solutions for industrial, automotive, communications, and computing markets.

The MAX6381–MAX6390 family was engineered specifically for low-voltage, low-power microprocessor supervision in space-constrained and energy-sensitive applications, emphasizing precision threshold accuracy, minimal quiescent current, and robust transient immunity.

FAQ

What is the exact reset threshold voltage of the MAX6386XS46D3?

The MAX6386XS46D3 has a factory-set nominal reset threshold of 4.63V, with guaranteed tolerance of ±2.5% over the full operating temperature range of -40°C to +125°C. This value is confirmed in the Reset Thresholds table of the datasheet, where suffix "46" corresponds to VTH(nom) = 4.63V. The MAX6386XS46D3 uses this fixed threshold to monitor VCC and assert reset whenever the supply falls below this level.

Does the MAX6386XS46D3 support manual reset functionality?

Yes, the MAX6386XS46D3 includes a dedicated active-low manual reset input (MR) with an internal 63kΩ pullup resistor to VCC. Driving MR low forces an immediate reset assertion, which remains active for the full 140ms timeout period after MR is released. This feature is explicitly listed in the Selector Guide and Pin Description sections for MAX6386, confirming that the MAX6386XS46D3 supports debounced manual reset without external components.

What package type and pin count does the MAX6386XS46D3 use?

The MAX6386XS46D3 is packaged in a 4-pin SC70 (package code X4-1), as specified in the Ordering Information table. Its pinout is: Pin 1 = RESET (open-drain active-low), Pin 2 = VCC, Pin 3 = MR, Pin 4 = GND. This compact 1.0mm × 1.0mm footprint is confirmed in the Pin Configurations section and Package Information diagrams for the XS-series variants of the MAX6384–MAX6390 family.

What is the minimum reset timeout period for the MAX6386XS46D3?

The MAX6386XS46D3 has a minimum reset timeout period of 140ms, indicated by the "D3" suffix in its part number. This value is defined in the Reset Timeout Delay table, where D3 corresponds to tRP(min) = 140ms. The timeout begins when VCC rises above the 4.63V threshold and ensures the microprocessor remains held in reset long enough to complete stable power-up initialization.

Is the MAX6386XS46D3 compatible with other Maxim reset ICs in terms of pinout or footprint?

The MAX6386XS46D3 shares the same 4-pin SC70 package and pinout (RESET-VCC-MR-GND) with other XS-series parts like MAX6384XS46D3 and MAX6385XS46D3, making it footprint-compatible within the MAX6384–MAX6390 family. However, it is not pin-compatible with 3-pin or 6-pin variants (e.g., XR or LT versions) or with legacy families like MAX809, as confirmed in the Pin Configurations and Ordering Information sections.