Analog Devices Inc./Maxim Integrated MAX6833VXRD3+

Overview

MAX6833VXRD3+ from Maxim Integrated is a push-pull active-high microprocessor supervisory circuit in SC70-3 package, designed to monitor +1.575V supply voltage with ±2.5% threshold accuracy over temperature and assert reset for 210ms after VCC recovery or manual reset deassertion. It draws only 7.5µA typical supply current and guarantees valid RESET output down to VCC = 0.75V, making it suitable for low-power portable systems requiring reliable power-on reset and brownout protection.

For engineers reviewing the MAX6833VXRD3+ datasheet, MAX6833VXRD3+ pinout, MAX6833VXRD3+ application, or MAX6833VXRD3+ equivalent, key selection considerations include its fixed 1.575V reset threshold (suffix 'V'), 210ms timeout (suffix 'D3'), active-high push-pull RESET output, SC70-3 footprint, and compatibility with 1.2V–1.8V µP core supplies in space-constrained embedded designs.

Technical Context

The MAX6833VXRD3+ implements a precision bandgap-based voltage comparator with hysteresis (0.75% of VTH) to detect VCC drops below 1.575V, ignoring fast transients ≤100ns. Its internal timing circuit generates a fixed 210ms reset assertion window after VCC rises above threshold or MR release.

This device uses BiCMOS process technology (681 transistors), features an internal 20kΩ pullup on MR, and operates across -40°C to +85°C with supply voltage range 0.75V to 3.6V - ensuring robust reset behavior during slow power ramps and brownout conditions in battery-powered systems.

Key Specifications

Pinout & Package

MAX6833VXRD3+ is housed in a 3-pin SC70 package (1.25mm × 0.85mm, 0.65mm pitch). The package is RoHS-compliant and available in lead-free format (+T suffix).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6833VXRD3+, the MAX6833VXRD1+ offers identical form and function but reduced reset duration for speed-critical systems, while the MAX6316HPU29D3+ serves different voltage domains entirely and requires redesign of supply monitoring architecture.

Availability

MAX6833VXRD3+ is available at Aetrix Electronics and suitable for battery-powered IoT sensor nodes, wearable health monitors, low-voltage FPGA configuration monitors, and industrial PLC I/O modules requiring stable component supply across extended production lifecycles.

Supply support for MAX6833VXRD3+ 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 MAX6832–MAX6840 family was designed specifically to provide ultra-low-voltage, low-quiescent-current reset supervision for next-generation portable and energy-sensitive embedded systems using 1.2V–1.8V logic supplies.

FAQ

What is the exact reset threshold voltage of MAX6833VXRD3+ and how is it specified?

The MAX6833VXRD3+ has a factory-trimmed reset threshold of 1.575V, with ±2.5% accuracy over the full -40°C to +85°C operating temperature range. This value is defined by the 'V' suffix in the part number and confirmed in the Electrical Characteristics table under 'Reset Threshold (VTH)' for MAX6833 devices. The threshold remains stable across supply voltages from 0.75V to 3.6V.

Does MAX6833VXRD3+ support manual reset functionality, and how is it implemented?

Yes, MAX6833VXRD3+ includes a debounced active-low manual reset input (MR) with an internal 20kΩ pullup resistor to VCC. Pulling MR low forces reset assertion regardless of VCC level, and reset remains active for the full 210ms timeout after MR returns high. No external debounce components are required, simplifying pushbutton interface design in compact systems.

What is the minimum VCC voltage at which MAX6833VXRD3+ guarantees valid RESET output behavior?

MAX6833VXRD3+ guarantees valid active-high RESET output down to VCC = 0.75V. Below this level, the push-pull driver may not maintain proper logic levels. For applications requiring reset validity at lower VCC, a 100kΩ pullup resistor to VCC is recommended to ensure RESET remains high during deep brownout conditions.

How does the 210ms reset timeout of MAX6833VXRD3+ compare to other options in the MAX6832–MAX6840 family?

The 'D3' suffix in MAX6833VXRD3+ specifies a 210ms reset timeout period, one of five standard options (70µs, 1.5ms, 30ms, 210ms, 1.68s). This duration balances robustness against short transients with timely system recovery - longer than 30ms for marginal supplies, shorter than 1.68s to avoid excessive boot delays in responsive embedded applications.

Is MAX6833VXRD3+ pin-compatible with legacy Maxim reset supervisors like MAX809 or MAX6381?

No, MAX6833VXRD3+ is not pin-compatible with MAX809 or MAX6381 series. While the datasheet notes functional similarity and system-level compatibility, MAX6833VXRD3+ uses SC70-3 packaging with GND/RESET/VCC pinout, whereas MAX809 uses SOT-23-3 with VCC/GND/RESET arrangement and MAX6381 uses SOT-23-5. Board redesign is required for substitution.