Analog Devices Inc./Maxim Integrated MAX6386XS23D3

Overview

MAX6386XS23D3 from Maxim Integrated is a low-power, open-drain active-low microprocessor supervisory circuit with factory-set 2.31V reset threshold, 140ms minimum reset timeout, and manual reset input (MR). It monitors VCC in systems from +1.8V to +5.0V, consumes only 3µA at +1.8V, and guarantees valid reset output down to VCC = 1V. It is used in portable battery-powered equipment for reliable power-on reset and brownout protection.

For engineers reviewing the MAX6386XS23D3 datasheet, MAX6386XS23D3 pinout, MAX6386XS23D3 application, or MAX6386XS23D3 equivalent, key selection criteria include its 2.31V ±2.5% threshold accuracy over –40°C to +125°C, 140ms VCC reset timeout, MR debounce capability, SC70-4 package footprint, and compatibility with dual-voltage monitoring architectures requiring external pullup.

Technical Context

The MAX6386XS23D3 implements a precision bandgap-based voltage comparator with ±2.5% threshold accuracy across temperature, paired with a temperature-stable RC timer for 140ms minimum reset assertion after VCC recovery. Its open-drain RESET output requires an external pullup and remains asserted during MR low pulses or VCC drops below 2.31V.

It features an internal 63kΩ MR pullup resistor, supports negative-going VCC transient immunity up to 35µs at 100mV overdrive, and maintains guaranteed logic state validity down to VCC = 1V - enabling robust operation in low-voltage brownout scenarios without external level-shifting.

Key Specifications

Pinout & Package

MAX6386XS23D3 is housed in a 4-pin SC70 package (X4-1), measuring 1.5mm × 1.0mm × 0.8mm, with wettable flank leads for automated optical inspection. The package is lead-free and RoHS-compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX809TRD3+T and TPS3808G125DBVR, the MAX6386XS23D3 uniquely combines MR input, 140ms timeout, SC70-4 compactness, and ultra-low 3µA ICC - making it optimal for space- and energy-constrained designs requiring field-serviceable reset initiation.

Availability

MAX6386XS23D3 is available at Aetrix Electronics and suitable for portable medical sensors, industrial PLC I/O modules, smart utility meters, and automotive body control units requiring stable component supply, long-lifecycle support, and guaranteed lead-free compliance.

Supply support for MAX6386XS23D3 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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, communications, and consumer applications.

The MAX6381–MAX6390 family was designed specifically for low-voltage, low-power microprocessor supervision in battery-operated and thermally demanding environments - delivering precision reset thresholds, minimal current draw, and robust noise immunity in miniature packages.

FAQ

What is the exact reset threshold voltage of the MAX6386XS23D3?

The MAX6386XS23D3 has a factory-set nominal reset threshold of 2.31V, 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 (suffix "23" corresponds to 2.31V min/nom/max values of 2.26V/2.31V/2.37V). The MAX6386XS23D3 uses a precision bandgap reference to maintain this accuracy without external components.

Does the MAX6386XS23D3 require an external pullup resistor on the RESET pin?

Yes, the MAX6386XS23D3 features an open-drain active-low RESET output, which requires an external pullup resistor to the appropriate logic rail (e.g., 3.3V or 5.0V). The datasheet specifies typical pullup values between 10kΩ and 100kΩ depending on bus capacitance and rise-time requirements. Without this resistor, the RESET signal cannot transition high, rendering the device nonfunctional in most µP interface configurations.

What is the function and electrical behavior of the MR pin on the MAX6386XS23D3?

The MR (Manual Reset) pin on the MAX6386XS23D3 is an active-low input with an internal 63kΩ pullup resistor to VCC. Driving MR to GND forces the RESET output low for the duration of the pulse plus the full 140ms timeout period. The pin rejects glitches shorter than 1µs and supports TTL/CMOS logic levels. When unused, MR may be left floating due to the internal pullup - no external component is required unless noise immunity enhancements (e.g., 0.1µF capacitor to GND) are needed.

Can the MAX6386XS23D3 operate reliably at VCC = 1.2V?

Yes, the MAX6386XS23D3 guarantees correct RESET output logic state down to VCC = 1.0V, as explicitly stated in the Electrical Characteristics table and Detailed Description section. At VCC = 1.2V, the device continues to monitor the supply, assert RESET when VCC falls below 2.31V (though that condition cannot occur at 1.2V), and maintain valid output drive capability - making it suitable for deep brownout detection in systems with collapsing rails.

What package type and dimensions does the MAX6386XS23D3 use?

The MAX6386XS23D3 is packaged in a 4-pin SC70 (X4-1) package measuring 1.5mm × 1.0mm × 0.8mm with wettable flank leads. This footprint is documented in the Package Information section (drawing 21-0098) and is compatible with standard reflow soldering processes. The SC70-4 variant distinguishes it from 3-pin (X3-2) and 6-pin µDFN (L611-1) versions in the same family.