Analog Devices Inc./Maxim Integrated MAX6833FXRD3

Overview

MAX6833FXRD3 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 drops below 1.050V (±2.5% over temperature), maintains reset for 210ms after recovery, and draws only 7.5µA typical supply current - enabling reliable power-on reset in portable and battery-powered µP applications.

For engineers reviewing the MAX6833FXRD3 datasheet, MAX6833FXRD3 pinout, MAX6833FXRD3 application, or MAX6833FXRD3 equivalent, key selection criteria include its fixed 1.050V reset threshold, 210ms timeout period, SC70-3 package footprint, push-pull active-high output drive capability, and immunity to sub-100ns VCC transients.

Technical Context

The MAX6833FXRD3 implements a precision bandgap-based voltage comparator with 444mV internal reference, scaled via factory-trimmed resistors to deliver a nominal 1.050V reset threshold. Its reset logic includes a monostable timeout generator that guarantees 210ms minimum assertion time after VCC rises above threshold or manual reset deassertion.

It features an internally pulled-up MR input (20kΩ) compatible with CMOS-level signals and supports glitch rejection down to 100ns. The push-pull RESET output drives high to ≥0.8×VCC at 10µA source current when asserted, and remains valid down to VCC = 0.75V - ensuring deterministic reset behavior during brownout recovery.

Key Specifications

Pinout & Package

MAX6833FXRD3 is housed in a 3-pin SC70-3 package (2.0mm × 2.1mm × 0.95mm profile) with gull-wing leads, optimized for space-constrained portable PCB layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX809TRD3 and TPS3123QDBVRQ1, MAX6833FXRD3 offers optimal balance of 1.050V precision, 210ms timing, ultra-low 7.5µA current, and industrial-temperature SC70-3 packaging - making it the preferred choice for cost-sensitive, space-constrained 1.2V portable electronics.

Availability

MAX6833FXRD3 is available at Aetrix Electronics and suitable for battery-powered IoT sensors, wearable health monitors, and low-voltage FPGA configuration requiring stable component supply with consistent lead times and volume pricing.

Supply support for MAX6833FXRD3 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, computing, and communications markets.

The MAX6832–MAX6840 family was developed specifically to address ultra-low-voltage µP supervision needs in sub-1.8V portable and embedded systems, replacing discrete reset solutions with integrated, factory-trimmed SC70-packaged circuits.

FAQ

What is the exact reset threshold voltage of MAX6833FXRD3 and how is it specified?

The MAX6833FXRD3 has a factory-set reset threshold of 1.050V, with ±2.5% accuracy guaranteed over the full -40°C to +85°C operating temperature range. This value is derived from the 'F' suffix in the part number per the Threshold Suffix Guide, and is confirmed in the Electrical Characteristics table under VTH parameter with MIN/TYP/MAX values of 1.020V/1.050V/1.080V. The threshold remains stable due to internal bandgap reference and laser trimming.

Does MAX6833FXRD3 support manual reset functionality, and how is it implemented?

Yes, MAX6833FXRD3 includes a debounced manual reset input (MR) with an internal 20kΩ pullup resistor to VCC. Pulling MR low forces an immediate active-high RESET assertion, which remains active for the full 210ms timeout period after MR returns high. No external components are required - a simple momentary switch from MR to GND suffices, and the internal debounce eliminates need for RC filtering.

What is the maximum VCC voltage at which MAX6833FXRD3 guarantees valid RESET output operation?

MAX6833FXRD3 guarantees valid active-high RESET output down to VCC = 0.75V across the full -40°C to +85°C temperature range. Below this voltage, the output may not maintain proper logic levels. This is explicitly stated in the Electrical Characteristics table under "Guaranteed Reset Valid to VCC" for active-high variants and verified in the Absolute Maximum Ratings section.

Can MAX6833FXRD3 be used with a 1.2V supply, and what design considerations apply?

Yes, MAX6833FXRD3 is specifically designed for 1.2V to 1.8V systems. With its 1.050V reset threshold, it provides 150mV of headroom above the 1.2V nominal supply - sufficient to tolerate typical 1.2V rail tolerances (±5%) and ensure robust brownout detection. Its 7.5µA supply current minimizes loading on the 1.2V rail, and its SC70-3 footprint fits tight-layout portable designs.

How does the 210ms timeout period of MAX6833FXRD3 compare to other options in the MAX6832–MAX6840 family?

The 'D3' suffix in MAX6833FXRD3 specifies a 210ms reset timeout period, one of five fixed options (70µs, 1.5ms, 30ms, 210ms, 1.68s) available across the family. This duration exceeds JEDEC JESD78 minimum requirements for µP reset hold time and is ideal for systems with slow clock startup or multi-stage power sequencing - unlike shorter timeouts (e.g., 1.5ms) used in fast-boot applications or longer ones (1.68s) reserved for high-reliability industrial controllers.