Analog Devices Inc./Maxim Integrated MAX6386XS29D2

Overview

MAX6386XS29D2 from Maxim Integrated is a low-power, open-drain active-low microprocessor supervisory circuit with factory-set 2.93V reset threshold and 20ms minimum reset timeout. It monitors VCC supply voltage in systems operating from +1.8V to +5.0V, features a debounced manual reset input (MR), guarantees valid reset output down to VCC = 1V, and is used in portable battery-powered equipment and embedded controllers requiring reliable power-on reset.

For engineers reviewing the MAX6386XS29D2 datasheet, MAX6386XS29D2 pinout, MAX6386XS29D2 application, or MAX6386XS29D2 equivalent, key selection criteria include its 2.93V ±2.5% threshold accuracy over –40°C to +125°C, 3µA supply current at 1.8V, SC70-4 package footprint, MR input with internal 63kΩ pullup, and open-drain RESET output requiring external pullup.

Technical Context

The MAX6386XS29D2 implements a precision bandgap-based voltage comparator for VCC monitoring and an internal monostable timer for reset assertion timing. Its reset logic asserts low on VCC drop below 2.93V or MR low, holding RESET low for ≥20ms after recovery. The MR input includes internal debouncing and 63kΩ pullup, enabling direct switch connection without external components.

As part of the MAX6381–MAX6390 family, it shares BiCMOS process technology and 647-transistor architecture optimized for ultra-low quiescent current. Unlike dual-monitor variants (e.g., MAX6387), it lacks RESET IN functionality and supports only single-supply VCC monitoring - confirmed by pin configuration and selector guide.

Key Specifications

Pinout & Package

MAX6386XS29D2 is packaged in a lead-free 4-pin SC70 (X4-1) package measuring 2.0mm × 2.1mm × 0.95mm, suitable 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 MAX6386XS29D2, MAX6326XR29D2 eliminates the need for an external pullup resistor but forfeits manual reset functionality, while TPS3808G18DBVR offers lower ICC and broader VCC range at the cost of added BOM complexity for MR biasing - making MAX6386XS29D2 optimal for cost-sensitive, space-constrained designs needing integrated MR.

Availability

MAX6386XS29D2 is available at Aetrix Electronics and suitable for portable medical sensors, industrial PLC I/O modules, smart metering endpoints, and automotive body control units requiring stable component supply and long-term production continuity.

Supply support for MAX6386XS29D2 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 power management, sensing, and interface applications, with emphasis on low-power, high-reliability solutions for industrial and automotive markets.

MAX6386XS29D2 belongs to the MAX6381–MAX6390 family of single-supply µP supervisory circuits engineered for ultra-low-power, space-constrained embedded systems where deterministic reset behavior under brownout and fast manual recovery are critical.

FAQ

What is the exact reset threshold voltage and tolerance for MAX6386XS29D2?

The MAX6386XS29D2 has a factory-set reset threshold of 2.93V with ±2.5% accuracy over the full operating temperature range of –40°C to +125°C. This value is specified in the Reset Thresholds table of the datasheet and confirmed by electrical characteristics testing. The threshold remains stable due to internal bandgap reference and low tempco (60ppm/°C), ensuring reliable brownout detection in industrial environments where MAX6386XS29D2 is deployed.

Does MAX6386XS29D2 support manual reset, and how is it implemented?

Yes, MAX6386XS29D2 includes a debounced manual reset input (MR) on Pin 3, featuring an internal 63kΩ pullup resistor to VCC. Driving MR low (≤0.3×VCC) forces RESET low for the full 20ms timeout period, even if VCC remains above threshold. This allows direct connection of a normally open momentary switch between MR and GND - no external components are needed. The MR function is confirmed in the Selector Guide and Pin Description sections for MAX6386XS29D2.

What package type and dimensions does MAX6386XS29D2 use?

MAX6386XS29D2 uses a lead-free 4-pin SC70 package (package code X4-1), with nominal dimensions of 2.0mm × 2.1mm × 0.95mm. The top-marking "XS" denotes the SC70-4 variant, and the package outline matches Maxim's 21-0098 specification. This compact footprint is validated in the Ordering Information and Package Information sections, and is distinct from the 3-pin SC70 (X3-2) and 6-pin µDFN (L611-1) options used by other members of the MAX6381–MAX6390 family.

Can MAX6386XS29D2 operate reliably at VCC = 1.0V?

Yes, MAX6386XS29D2 guarantees correct reset output logic state down to VCC = 1.0V, as stated in the Absolute Maximum Ratings and Electrical Characteristics tables. Below 1.0V, the device may not assert reset predictably, but within its 1.0V–5.5V operating range, RESET remains valid - critical for applications like battery-powered devices experiencing deep brownout. This behavior is explicitly documented for MAX6386XS29D2 in the Detailed Description section.

Is an external pullup resistor required for the RESET output of MAX6386XS29D2?

Yes, an external pullup resistor is mandatory for the open-drain RESET output of MAX6386XS29D2. The datasheet specifies that RESET requires external biasing to define the high-level voltage, typically to the same rail as the µP reset input (e.g., 3.3V or 5.0V). Values between 10kΩ and 100kΩ are common; the choice balances rise time and power consumption. This requirement is inherent to open-drain topology and is confirmed in the Pin Description and Typical Operating Circuit diagrams for MAX6386XS29D2.