Analog Devices Inc./Maxim Integrated MAX6836FXSD0

Overview

MAX6836FXSD0 from Maxim Integrated is a push-pull active-high microprocessor supervisory circuit designed to monitor +1.2V to +1.8V supply rails in low-voltage digital systems. It asserts RESET when VCC falls below 1.050V (±2.5% over temperature) or MR is pulled low, with a fixed 1.5ms timeout after recovery. Its 7.5µA typical supply current and SC70-4 package make it suitable for portable battery-powered µP reset applications.

For engineers reviewing the MAX6836FXSD0 datasheet, MAX6836FXSD0 pinout, MAX6836FXSD0 application, or MAX6836FXSD0 equivalent, key selection criteria include its factory-set 1.050V reset threshold, 1.5ms active-high reset timeout, debounced manual reset input, guaranteed operation down to VCC = 0.75V, and compatibility with space-constrained SC70-4 layouts.

Technical Context

The MAX6836FXSD0 implements a precision bandgap-based voltage comparator with ±2.5% threshold accuracy across –40°C to +85°C, paired with a fixed 1.5ms monostable timeout circuit triggered by VCC drop or MR assertion. Its internal 20kΩ MR pullup enables direct switch-to-ground connection without external components.

This device belongs to the MAX6832–MAX6840 family of ultra-low-voltage SC70 supervisors and uses BiCMOS process technology (681 transistors). It features glitch immunity against short negative VCC transients and guarantees valid RESET output down to VCC = 0.75V for active-high operation.

Key Specifications

Pinout & Package

MAX6836FXSD0 is housed in a 4-pin SC70 package (1.3mm × 1.6mm, 0.5mm pitch), optimized for space-constrained portable designs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6836FXSD0, the MAX6836FXRD0 saves board area but sacrifices MR integration, while the MAX6316HUT46+T offers higher voltage support and watchdog features at the cost of larger size and different timing-making MAX6836FXSD0 optimal for compact 1.2V systems needing self-contained manual reset.

Availability

MAX6836FXSD0 is available at Aetrix Electronics and suitable for battery-powered IoT sensor nodes, low-voltage microcontroller systems, and portable medical diagnostic devices requiring stable component supply and long-term lifecycle support.

Supply support for MAX6836FXSD0 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, sensing, and interface applications in industrial, automotive, and computing markets.

The MAX6832–MAX6840 product line delivers ultra-low-voltage microprocessor supervisory circuits targeting portable and battery-operated equipment where space, power, and reliability are critical.

FAQ

What is the exact reset threshold voltage of the MAX6836FXSD0 and how accurate is it over temperature?

The MAX6836FXSD0 has a factory-set reset threshold of 1.050V with ±2.5% accuracy over the full operating temperature range of –40°C to +85°C. This specification is guaranteed by design and verified across temperature, ensuring reliable brownout detection for 1.2V systems without calibration or external components. The MAX6836FXSD0 maintains this accuracy using an internal bandgap reference and trimmed comparator.

Does the MAX6836FXSD0 support manual reset, and what is required to implement it?

Yes, the MAX6836FXSD0 includes a debounced active-low manual reset (MR) input on Pin 3, featuring an internal 20kΩ pullup resistor to VCC. To implement manual reset, connect a normally open momentary switch between MR and ground; no external RC filter or firmware debounce is needed. The MAX6836FXSD0 guarantees MR-to-RESET delay of 500ns and rejects glitches shorter than 100ns.

What is the reset timeout period for the MAX6836FXSD0 and why is it important?

The MAX6836FXSD0 provides a fixed 1.5ms reset timeout period (D1 option), meaning RESET remains asserted for 1.5ms after VCC rises above 1.050V or MR is released. This duration ensures sufficient hold time for microcontrollers like ARM Cortex-M series to complete internal power-on reset sequencing, oscillator stabilization, and register initialization before code execution begins. The MAX6836FXSD0's timeout is factory-trimmed and temperature-stable.

Can the MAX6836FXSD0 operate reliably at very low supply voltages?

Yes, the MAX6836FXSD0 guarantees valid active-high RESET output down to VCC = 0.75V, enabling robust brownout detection even during deep discharge of lithium batteries. Below 0.75V, the output remains functional but specifications are not guaranteed. Its 7.5µA typical supply current at 1.2V allows continuous supervision in energy-harvesting or multi-year battery applications. The MAX6836FXSD0's BiCMOS process ensures stable operation across this extended low-voltage range.

What package type does the MAX6836FXSD0 use and what are its key mechanical characteristics?

The MAX6836FXSD0 is packaged in a 4-pin SC70 (SOT-323) outline measuring 1.3mm × 1.6mm with 0.5mm lead pitch. This ultra-small footprint supports high-density PCB layouts in portable electronics. The package is available in both leaded and lead-free versions (suffix "+T" denotes lead-free); the standard "-T" version is RoHS-compliant and tape-and-reel ready. Pin 1 is GND, Pin 2 is RESET, Pin 3 is MR, and Pin 4 is VCC - consistent across all MAX6835/MAX6836/MAX6837 SC70-4 variants. The MAX6836FXSD0's SC70-4 package enables drop-in replacement for functionally similar 3-pin parts when MR integration is required.