Analog Devices Inc./Maxim Integrated MAX6841DUKD4

Overview

MAX6841DUKD4 from Maxim Integrated is an ultra-low-voltage microprocessor supervisory circuit designed to monitor +0.9V to +1.5V power supplies in portable and battery-powered digital systems. It provides factory-trimmed 0.788V reset threshold, 1.68s reset timeout period (D4 suffix), ±2.5% threshold accuracy over temperature, active-low push-pull RESET output, and debounced manual reset input - enabling reliable power-on reset and brownout protection for critical µP applications.

For engineers reviewing the MAX6841DUKD4 datasheet, MAX6841DUKD4 pinout, MAX6841DUKD4 application, or MAX6841DUKD4 equivalent, this device supports low-power system monitoring where VCC can fall as low as 0.55V while maintaining valid reset assertion, requires no external components for basic operation, and delivers immunity to sub-150ns VCC transients.

Technical Context

The MAX6841DUKD4 integrates a precision voltage comparator with hysteresis (0.75% of VTH) and a fixed 1.68s timeout timer triggered by either VCC falling below 0.788V or MR assertion. Its internal 20kΩ MR pullup eliminates external biasing, and the reset comparator ignores fast transients due to built-in glitch rejection (150ns minimum pulse rejection).

This variant belongs to the MAX6841 series with D-suffix timeout (D4 = 1.68s typ) and U-suffix package (SOT23-5), configured with active-low push-pull RESET and factory-set threshold - distinguishing it from adjustable-threshold variants (MAX6843–MAX6845) and open-drain output versions (MAX6842/MAX6845).

Key Specifications

Pinout & Package

Package: 5-pin SOT23-5 (lead-free, tape-and-reel). Pin 1 marked with dot; top view per datasheet drawing E21-0057.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6842DUKD4, MAX6841DUKD4 eliminates pullup resistor cost and simplifies layout for standard CMOS reset inputs; compared with TPS3123DQDBVR, it offers complementary reset outputs and higher noise immunity at the expense of ~2.2µA higher supply current.

Availability

MAX6841DUKD4 is available at Aetrix Electronics and suitable for portable medical sensors, battery-powered IoT edge nodes, industrial PLC I/O modules, telecom baseband processors, and critical µP power monitoring requiring stable component supply across long production lifecycles.

Supply support for MAX6841DUKD4 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, mixed-signal, and power management ICs for demanding industrial, automotive, and communications applications.

The MAX6841–MAX6845 family was developed specifically for ultra-low-voltage microprocessor supervision in space-constrained, battery-operated systems where traditional reset ICs fail to operate below 1.0V.

FAQ

What is the exact reset threshold voltage of the MAX6841DUKD4?

The MAX6841DUKD4 has a factory-trimmed reset threshold of 0.788V with ±2.5% accuracy over the full -40°C to +85°C temperature range. This value is fixed and non-adjustable, corresponding to the 'D' suffix in the part number per Table 1 of the datasheet. The threshold is referenced to VCC and remains stable across voltage and temperature variations, ensuring consistent brownout detection for 0.9V–1.5V supply rails.

Does the MAX6841DUKD4 provide both active-high and active-low reset outputs?

Yes, the MAX6841DUKD4 provides two complementary reset outputs: Pin 1 is active-low push-pull RESET, and Pin 3 is active-high push-pull RESET. These outputs are inverted relative to each other and assert simultaneously when VCC falls below 0.788V or when MR is pulled low. This dual-output capability allows direct interface with µPs requiring either polarity and supports status indication without additional logic.

What is the guaranteed minimum VCC level at which the MAX6841DUKD4 maintains valid reset assertion?

The MAX6841DUKD4 guarantees valid reset assertion down to VCC = 0.55V for its active-low push-pull output. Below this voltage, the output transitions to high-impedance, but the reset signal remains asserted until VCC recovers above the 0.788V threshold plus hysteresis. This specification ensures deterministic behavior during deep battery discharge in portable equipment where supply collapse must trigger controlled shutdown.

How does the manual reset (MR) input function on the MAX6841DUKD4?

The MR input on the MAX6841DUKD4 is an active-low, internally pulled up (20kΩ to VCC) pin that forces reset when pulled below 0.3×VCC. Reset remains asserted for the full 1.68s timeout period after MR returns high. No external components are required - a momentary switch to ground suffices. The input rejects glitches shorter than 150ns and accepts minimum pulse widths of 1µs, making it robust against contact bounce and EMI.

What timeout period is implemented in the MAX6841DUKD4, and how is it selected?

The MAX6841DUKD4 implements a 1.68s typical reset timeout period, designated by the 'D4' suffix in its part number. This value is fixed and factory-programmed - not user-configurable. It corresponds to the longest standard option in the family (Table 2), providing ample hold time for complex µP initialization sequences, slow power supply ramp-ups, or firmware-controlled boot processes after brownout recovery.