Analog Devices Inc./Maxim Integrated MAX6833HXRD3

Overview

MAX6833HXRD3 from Maxim Integrated is a push-pull active-high microprocessor supervisory circuit designed to monitor +1.313V supply rails in low-voltage digital systems. It asserts RESET when VCC drops below 1.313V (±2.5% over temperature) or MR is pulled low, maintains reset for 210ms after recovery, and draws only 9µA at 1.8V - enabling reliable power-on reset in portable battery-powered controllers.

For engineers reviewing the MAX6833HXRD3 datasheet, MAX6833HXRD3 pinout, MAX6833HXRD3 application, or MAX6833HXRD3 equivalent, key selection criteria include its 1.313V factory-set threshold, 210ms timeout period (D3 suffix), SC70-3 package, active-high push-pull output, and guaranteed operation down to VCC = 0.75V.

Technical Context

The MAX6833HXRD3 implements a precision bandgap-based voltage comparator with ±2.5% threshold accuracy across –40°C to +85°C, and integrates a fixed 210ms reset timeout timer triggered by VCC drop or manual reset assertion. Its internal 20kΩ MR pullup enables direct switch interfacing without external components.

This device uses BiCMOS process technology (681 transistors) and features glitch immunity against sub-100ns negative VCC transients. Reset assertion remains valid down to VCC = 0.75V, and the push-pull output drives high with VOH ≥ 0.8×VCC at 10µA source current.

Key Specifications

Pinout & Package

MAX6833HXRD3 is housed in a 3-pin SC70 package (1.25mm × 2.1mm, 0.65mm pitch) with gull-wing leads. Pin 1 is GND, Pin 2 is RESET (push-pull active-high), and Pin 3 is VCC.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6833VXRD3 and MAX6836HXSD3, the MAX6833HXRD3 uniquely balances minimal footprint (SC70-3), precise 1.313V threshold for 1.3V systems, and zero-external-component MR interface - making it optimal for space- and power-constrained 1.3V embedded designs where MR noise is controlled externally.

Availability

MAX6833HXRD3 is available at Aetrix Electronics and suitable for battery-powered instrumentation, industrial control modules, and medical wearables requiring stable component supply with guaranteed long-term continuity.

Supply support for MAX6833HXRD3 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 family delivers ultra-low-voltage supervisory circuits optimized for sub-1.8V digital systems - targeting portable, battery-operated, and energy-sensitive embedded applications where size, power, and accuracy are critical.

FAQ

What is the exact reset threshold voltage of the MAX6833HXRD3, and how accurate is it over temperature?

The MAX6833HXRD3 has a factory-set reset threshold of 1.313V with ±2.5% accuracy over the full –40°C to +85°C operating range. This value is laser-trimmed during production and confirmed in the Electrical Characteristics table under "Reset Threshold" for H-suffix devices. The MAX6833HXRD3 maintains this tolerance without external calibration or compensation networks.

Does the MAX6833HXRD3 support manual reset, and what is required to implement it?

Yes, the MAX6833HXRD3 includes a debounced manual reset input (MR) with an internal 20kΩ pullup to VCC. To implement manual reset, connect a normally open momentary switch between MR and ground. No external RC network is needed - the internal debounce ensures clean reset assertion even with mechanical switch bounce.

What is the function of the RESET pin on the MAX6833HXRD3, and what are its drive capabilities?

The RESET pin on the MAX6833HXRD3 is a push-pull active-high output. When asserted, it drives HIGH (VOH ≥ 0.8×VCC at 10µA); when deasserted, it drives LOW (VOL ≤ 0.2×VCC at 80µA). It does not require an external pullup resistor and interfaces directly with standard CMOS µP reset inputs.

Can the MAX6833HXRD3 operate reliably during severe supply voltage droop, and down to what VCC level does RESET remain valid?

Yes, the MAX6833HXRD3 guarantees valid RESET output down to VCC = 0.75V (for 0°C to +85°C) and 0.85V (for –40°C to +85°C). Below these levels, the output may become indeterminate. This ensures robust reset assertion during automotive cold-cranking or battery depletion scenarios before system collapse.

What package type and dimensions does the MAX6833HXRD3 use, and is it RoHS-compliant?

The MAX6833HXRD3 uses a 3-pin SC70 package measuring 1.25mm × 2.1mm with 0.65mm lead pitch. It is offered in both leaded and lead-free versions; the "+T" suffix denotes lead-free packaging. The "-T" suffix in MAX6833HXRD3 indicates tape-and-reel packaging - standard for automated SMT assembly.