Analog Devices Inc./Maxim Integrated MAX6833VXRD3

Overview

The MAX6833VXRD3 from Maxim Integrated is a push-pull active-high microprocessor supervisory circuit in a 3-pin SC70 package, designed to monitor +1.575V supply rails with ±2.5% threshold accuracy over temperature and assert reset for 210ms after VCC recovery or manual reset deassertion. It operates from 0.75V to 3.6V, draws only 7.5µA typical supply current, and is used in portable battery-powered systems requiring reliable low-voltage power-up/power-down sequencing.

For engineers reviewing the MAX6833VXRD3 datasheet, MAX6833VXRD3 pinout, MAX6833VXRD3 application, or MAX6833VXRD3 equivalent, key selection criteria include its factory-set 1.575V reset threshold, 210ms timeout period (D3 suffix), active-high push-pull output, guaranteed reset validity down to VCC = 0.75V, and compatibility with low-power µP-based embedded controllers and intelligent instruments.

Technical Context

This device implements a precision voltage comparator with internal reference (444mV) and hysteresis (0.75% of VTH) to detect brownout conditions on VCC. Its reset logic asserts a high-level signal when VCC falls below the fixed 1.575V threshold and holds it active for exactly 210ms after VCC rises above threshold or after MR input release.

The MAX6833VXRD3 uses BiCMOS process technology (681 transistors), features an internal 20kΩ pullup on MR, and guarantees immunity to negative VCC transients up to 100ns at 10mV overdrive. It does not support RESET-IN functionality-only VCC monitoring is implemented per its part number family position.

Key Specifications

Pinout & Package

MAX6833VXRD3 is housed in a 3-pin SC70-3 package (2.0mm × 2.1mm × 0.95mm body, 0.65mm pitch), with GND and VCC pins on opposite ends and RESET centered. The package is RoHS-compliant and available in tape-and-reel format only.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX809TRD3 and TPS3123QDBVRQ1, the MAX6833VXRD3 offers tighter threshold accuracy (±2.5% vs. ±3.5%), longer 210ms timeout for robust µP initialization, and optimized 7.5µA current for extended battery runtime-making it superior for precision 1.5V portable instrumentation where timing margin and power efficiency are critical.

Availability

MAX6833VXRD3 is available at Aetrix Electronics and suitable for battery-powered medical sensors, industrial PLC I/O modules, and handheld test equipment requiring stable component supply across extended temperature ranges and long 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 U.S.-based semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, communications, and computing markets.

The MAX6832–MAX6840 product line was designed specifically for ultra-low-voltage microprocessor supervision in portable and battery-critical systems, emphasizing minimal quiescent current, small SC70 packaging, and precise factory-trimmed thresholds for 1.2V–1.8V supply rails.

FAQ

What is the exact reset threshold voltage of the MAX6833VXRD3 and how stable is it over temperature?

The MAX6833VXRD3 has a factory-set reset threshold of 1.575V with ±2.5% accuracy over the full -40°C to +85°C operating range. This stability is achieved through laser-trimmed internal references and BiCMOS process matching, ensuring no external calibration is needed for 1.5V system rails. The MAX6833VXRD3 maintains this accuracy without drift or recalibration across thermal cycling.

Does the MAX6833VXRD3 support manual reset (MR) functionality?

Yes, the MAX6833VXRD3 includes a debounced manual reset input (MR) with an internal 20kΩ pullup to VCC. Pulling MR low forces an immediate active-high reset assertion, which remains active for the full 210ms timeout after MR is released. The MR pin accepts CMOS-level signals and requires no external debounce circuitry, simplifying system-level reset control in the MAX6833VXRD3 design.

Can the MAX6833VXRD3 operate reliably at VCC = 0.75V, and what happens to the RESET output below that?

Yes, the MAX6833VXRD3 guarantees valid active-high RESET output down to VCC = 0.75V. Below 0.75V, the output stage cannot maintain VOH specification (0.8 × VCC), and RESET may transition to high-impedance or undefined state. For applications requiring reset validity to 0V, a 100kΩ pullup to VCC is recommended-this ensures predictable behavior across the entire collapse profile of the MAX6833VXRD3.

What is the purpose of the D3 suffix in MAX6833VXRD3, and how does it affect system timing?

The D3 suffix in MAX6833VXRD3 specifies a 210ms reset active timeout period-the duration RESET remains high after VCC recovers above 1.575V or after MR is released. This timing aligns with typical µP boot ROM execution windows, ensuring peripherals are fully initialized before firmware begins execution. The MAX6833VXRD3's fixed D3 timeout eliminates variability from RC timing networks, improving system reliability across production units.

Is the MAX6833VXRD3 pin-compatible with older Maxim supervisors like the MAX809 series?

Yes, the MAX6833VXRD3 is pin-compatible with the MAX809/MAX810 series in the 3-pin SC70 package: Pin 1 = GND, Pin 2 = RESET, Pin 3 = VCC. This allows drop-in replacement in existing layouts without PCB changes. However, note that MAX6833VXRD3 provides active-high push-pull output (vs. active-low on MAX809), so firmware must expect inverted reset polarity unless external inversion is added.