Analog Devices Inc./Maxim Integrated MAX6833WXRD1

Overview

MAX6833WXRD1 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 1.665V (±2.5% over temperature) or MR is pulled low, with a fixed 1.5ms timeout after recovery. Its 7.5µA typical supply current and SC70-3 package make it suitable for portable battery-powered µP reset applications.

For engineers reviewing the MAX6833WXRD1 datasheet, MAX6833WXRD1 pinout, MAX6833WXRD1 application, or MAX6833WXRD1 equivalent, key selection criteria include its active-high push-pull RESET output, factory-set 1.665V threshold, 1.5ms reset timeout, immunity to short VCC transients, and compatibility with space-constrained embedded power monitoring designs.

Technical Context

The MAX6833WXRD1 implements a precision voltage comparator with ±2.5% threshold accuracy over -40°C to +85°C, referenced to an internal 444mV bandgap. Its reset logic guarantees valid RESET assertion down to VCC = 0.75V for active-high operation and includes built-in hysteresis (0.75% of VTH) to reject noise on the monitored supply.

This device uses a BiCMOS process with 681 transistors and features an internal 20kΩ pullup on the MR input. Reset activation is triggered solely by VCC falling below the fixed 1.665V threshold or MR assertion, with no dependency on external components for basic functionality.

Key Specifications

Pinout & Package

MAX6833WXRD1 is housed in a 3-pin SC70 package (1.25mm × 2.1mm, 0.65mm pitch), optimized for high-density portable designs. 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 MAX6833WXRD1, MAX809TRD1 targets higher-voltage domains and offers longer timeout but cannot supervise 1.2V–1.8V rails, while TLV803EB29DBZR achieves nanoamp quiescent current at the cost of output drive capability and manual reset functionality-making MAX6833WXRD1 optimal for compact, low-voltage, active-high reset applications requiring integrated MR support.

Availability

MAX6833WXRD1 is available at Aetrix Electronics and suitable for battery-powered IoT sensors, low-voltage FPGA configuration monitors, and industrial PLC I/O modules requiring stable component supply and long-term production continuity.

Supply support for MAX6833WXRD1 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 battery-critical systems operating below 1.8V.

FAQ

What is the exact reset threshold voltage of MAX6833WXRD1 and how stable is it over temperature?

The MAX6833WXRD1 has a factory-set reset threshold of 1.665V with ±2.5% accuracy over the full -40°C to +85°C operating range. This specification is guaranteed by design and 100% production tested at +25°C. The threshold remains stable due to an internal bandgap reference and built-in hysteresis of 0.75% of VTH, ensuring robust operation across thermal cycling without external calibration.

Does MAX6833WXRD1 support manual reset, and what are the interface requirements?

Yes, MAX6833WXRD1 includes a debounced manual reset (MR) input with an internal 20kΩ pullup resistor to VCC. To assert reset, MR must be driven below 0.3×VCC for a minimum pulse width of 2µs. The input accepts CMOS logic levels and can interface directly with momentary switches (to GND) or open-drain drivers-no external debounce circuitry is needed, simplifying board design and reducing component count.

What is the minimum VCC voltage at which MAX6833WXRD1 guarantees valid RESET output?

MAX6833WXRD1 guarantees valid active-high RESET output down to VCC = 0.75V. Below this level, the push-pull driver may not maintain specified VOH or VOL performance. For applications requiring reset assertion down to 0V, a 100kΩ pullup resistor to VCC is recommended to ensure predictable logic state during deep brownout conditions.

How does the 1.5ms reset timeout period of MAX6833WXRD1 compare to other options in the MAX6832–MAX6840 family?

The "D1" suffix in MAX6833WXRD1 specifies a 1.5ms reset timeout period, one of five standard options (D0 = 70µs, D1 = 1.5ms, D2 = 30ms, D3 = 210ms, D4 = 1680ms). This value balances sufficient processor hold time against fast system recovery-ideal for most µP and FPGA applications where JEDEC JESD78 compliance requires ≥1ms minimum reset pulse width.

Is MAX6833WXRD1 pin-compatible with legacy Maxim reset ICs like the MAX809 series?

No, MAX6833WXRD1 is not pin-compatible with the MAX809 series. While both use SC70-3 packages, MAX809 variants have different pinouts (e.g., VCC on Pin 1, GND on Pin 2, RESET on Pin 3), whereas MAX6833WXRD1 uses Pin 1 = GND, Pin 2 = RESET, Pin 3 = VCC. Direct replacement would require PCB layout revision; however, functional equivalents exist with matching pinouts in the MAX6832–MAX6840 family itself.