Analog Devices Inc./Maxim Integrated MAX6837HXSD0+

Overview

The MAX6837HXSD0+ from Maxim Integrated is an ultra-low-voltage microprocessor supervisory circuit with open-drain active-low reset output, factory-set 1.313V reset threshold, and 1.5ms reset timeout period. It monitors +1.2V to +1.8V supplies in portable and embedded systems, asserts reset during brownout or manual trigger, and guarantees valid reset down to VCC = 0.55V. Designed for critical µP power monitoring in battery-powered equipment.

For engineers reviewing the MAX6837HXSD0+ datasheet, MAX6837HXSD0+ pinout, MAX6837HXSD0+ application, or MAX6837HXSD0+ equivalent, this device delivers precise low-voltage supervision with debounced manual reset, ±2.5% threshold accuracy over temperature, and SC70-4 packaging optimized for space-constrained designs.

Technical Context

The MAX6837HXSD0+ implements a precision voltage comparator with 444mV internal reference, comparing VCC against a factory-trimmed threshold (1.313V) to detect brownout conditions. Its reset logic includes a fixed 1.5ms timeout counter that holds RESET asserted after VCC recovery or MR release.

It features a debounced manual reset input (MR) with internal 20kΩ pullup and glitch rejection of 100ns, plus an open-drain RESET output requiring external pullup-enabling level-shifting across supply domains and interoperability with bidirectional µP reset pins.

Key Specifications

Pinout & Package

MAX6837HXSD0+ is housed in a 4-pin SC70-4 package (2.0mm × 2.1mm × 0.95mm), optimized for high-density PCB layouts in portable electronics.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6837HXSD0+, MAX6835HXSD0+ eliminates pullup components but forfeits voltage-level flexibility, while MAX6316HUT46+T trades size and power efficiency for legacy package compatibility and simplified feature set.

Availability

MAX6837HXSD0+ is available at Aetrix Electronics and suitable for battery-powered IoT nodes, low-voltage microcontroller systems, and industrial edge controllers requiring stable component supply with guaranteed long-term sourcing.

Supply support for MAX6837HXSD0+ 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 in industrial, automotive, and computing markets.

The MAX6832–MAX6840 family delivers ultra-low-voltage supervision for next-generation portable and energy-sensitive systems, targeting applications where supply rails shrink below 1.5V and board space is at a premium.

FAQ

What is the exact reset threshold voltage of the MAX6837HXSD0+ and how stable is it over temperature?

The MAX6837HXSD0+ has a factory-set reset threshold of 1.313V with ±2.5% accuracy over the full -40°C to +85°C operating range. This specification is guaranteed by design and confirmed in production testing. The threshold remains stable due to on-chip trimming and a robust BiCMOS process, ensuring consistent brownout detection without external calibration. This value is explicitly defined in the Threshold Suffix Guide for suffix 'H' and verified in the Electrical Characteristics table of the MAX6832–MAX6840 datasheet.

Does the MAX6837HXSD0+ include manual reset functionality, and how is it implemented?

Yes, the MAX6837HXSD0+ includes a debounced manual reset (MR) input on Pin 3. It features an internal 20kΩ pullup resistor to VCC, requires only a momentary switch to ground for activation, and rejects glitches shorter than 100ns. The MR signal forces reset assertion while held low and maintains the reset state for the full 1.5ms timeout after release. This eliminates the need for external RC filters or firmware-level debounce logic, making it ideal for field-serviceable embedded systems.

What package type and pin count does the MAX6837HXSD0+ use, and what are its key mechanical dimensions?

The MAX6837HXSD0+ uses a 4-pin SC70-4 package measuring 2.0mm × 2.1mm × 0.95mm. This surface-mount outline is documented in Maxim's package drawing 21-0098 and is compatible with standard reflow profiles for lead-free assembly. The compact footprint supports high-density layouts in space-constrained applications such as wearables and sensor modules, and the SC70-4 pinout is shared across the MAX6835–MAX6837 variants for design reuse.

Can the MAX6837HXSD0+ operate reliably at very low supply voltages, and what is its minimum functional VCC?

Yes, the MAX6837HXSD0+ guarantees valid reset assertion down to VCC = 0.55V - meaning the open-drain RESET output remains actively driven low even as the supply collapses. Below 0.55V, the output transitions to high-impedance, but the 1.5ms timeout and comparator behavior remain fully specified above that point. This capability is critical for graceful shutdown in systems powered by depleting batteries or supercapacitors, and is explicitly tested and guaranteed per the Absolute Maximum Ratings and Electrical Characteristics tables.

How does the open-drain RESET output of the MAX6837HXSD0+ differ from push-pull alternatives, and what design considerations apply?

The MAX6837HXSD0+ uses an open-drain RESET output requiring an external pullup resistor - enabling level-shifting (e.g., pulling up to 3.3V while monitoring a 1.3V rail) and wired-OR connections with other reset sources. Unlike push-pull versions, it cannot drive high actively, so pullup selection affects rise time and power consumption. A typical 10kΩ–100kΩ resistor balances speed and current draw. This architecture is essential for interfacing with bidirectional µP reset pins and multi-rail systems, as confirmed in the Applications Information section of the datasheet.