Analog Devices Inc./Maxim Integrated MAX6842DUKD0+T

Overview

MAX6842DUKD0+T from Maxim Integrated is an ultra-low-voltage microprocessor supervisory circuit with factory-trimmed 0.788V reset threshold, active-high push-pull RESET output, active-low open-drain RESET output, 150µs timeout (voltage detector mode), and manual reset input - designed for reliable power monitoring in 0.9V–1.5V digital systems such as portable battery-powered controllers and telecom baseband modules.

For engineers reviewing the MAX6842DUKD0+T datasheet, MAX6842DUKD0+T pinout, MAX6842DUKD0+T application, or MAX6842DUKD0+T equivalent, key selection criteria include its dual-output configuration (push-pull + open-drain), guaranteed reset validity down to VCC = 0.55V, ±2.5% threshold accuracy over temperature, 5.7µA typical supply current, and SOT23-5 package compatibility with space-constrained embedded designs.

Technical Context

The MAX6842DUKD0+T integrates a precision voltage comparator with factory-set 0.788V threshold (±2.5% over –40°C to +85°C), debounced manual reset input (MR) with internal 20kΩ pullup, and dual independent reset outputs: one active-high push-pull and one active-low open-drain. It asserts reset on VCC drop below threshold or MR assertion, holding reset for exactly 150µs after recovery - matching the D0 timeout option specified in the ordering guide.

This variant belongs to the MAX6841–MAX6845 family optimized for sub-1.5V supply monitoring; unlike MAX6843–MAX6845, it lacks RESET IN input and relies solely on internal threshold detection. Its open-drain output requires external pullup (0–VCC), enabling level-shifting and bidirectional µP reset pin interfacing without additional logic.

Key Specifications

Pinout & Package

SOT23-5 package: 2.9mm × 1.6mm × 1.1mm body, gull-wing leads, lead-free (RoHS-compliant) construction per +T suffix.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6842DUKD0+T, MAX6841DUKD0+T offers identical monitoring accuracy and timing but lacks open-drain flexibility, while TPS3123E18DBVR trades voltage detector responsiveness for ultra-low power and longer reset assertion - making MAX6842DUKD0+T optimal for compact, multi-rail systems needing fast, configurable reset signaling.

Availability

MAX6842DUKD0+T is available at Aetrix Electronics and suitable for portable medical sensors, industrial PLC I/O modules, and 5G small cell baseband applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for MAX6842DUKD0+T 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 industrial, communications, and computing markets, with emphasis on power management, sensing, and interface solutions.

The MAX6841–MAX6845 product line delivers ultra-low-voltage supervision for sub-1.5V digital systems, targeting portable, battery-powered, and energy-efficient embedded applications where space, power, and reliability are critical.

FAQ

What is the exact reset threshold voltage of MAX6842DUKD0+T and how is it trimmed?

The MAX6842DUKD0+T has a factory-trimmed reset threshold of 0.788V with ±2.5% accuracy over –40°C to +85°C. This value is laser-trimmed during wafer sort and verified per the D suffix in the ordering guide (Table 1). No external components are required to achieve this specification, and the threshold remains stable across temperature and supply variations without user adjustment.

Does MAX6842DUKD0+T support operation down to 0.55V VCC, and what happens to the outputs below that?

Yes, MAX6842DUKD0+T guarantees valid reset assertion down to VCC = 0.55V for the active-low open-drain output. Below 0.55V, the push-pull RESET output becomes high-impedance and no longer sources/sinks current. The open-drain output remains functional but requires external pullup; if VCC drops further, the internal circuitry ceases operation and reset state is no longer actively maintained.

How does the 150µs timeout period of MAX6842DUKD0+T differ from other timeout options in the family?

The 150µs timeout (D0 suffix) is specifically designated as the "voltage detector version" - optimized for fast response to supply transients rather than full-system reset sequencing. Unlike the 1.5ms, 30ms, or 210ms options, it provides minimal hold time suitable for detecting brief brownouts without delaying processor startup, making it ideal for real-time monitoring in portable equipment.

Can the manual reset input (MR) of MAX6842DUKD0+T be left unconnected, and what is its default state?

Yes, the MR pin of MAX6842DUKD0+T can be left unconnected because it features an internal 20kΩ pullup resistor to VCC. This ensures the input defaults to logic high (inactive) when unused. Pulling MR low for ≥1µs forces reset assertion, and reset remains active for the full 150µs timeout after MR returns high - no external components are needed for basic manual reset functionality.

What are the key design considerations when using the open-drain RESET output of MAX6842DUKD0+T?

When using the open-drain RESET output of MAX6842DUKD0+T, select a pullup resistor value between 10kΩ and 100kΩ connected to a voltage rail (0–VCC). Ensure the pullup voltage does not exceed 6V. For bidirectional µP reset interfaces, connect the pullup to the µP's VDDIO rail. Note that sink current capability degrades as VCC falls below 0.83V, so verify VOL ≤0.2×VCC under worst-case conditions.