Analog Devices Inc./Maxim Integrated MAX6842FUKD0+T

Overview

MAX6842FUKD0+T from Maxim Integrated is an ultra-low-voltage microprocessor supervisory circuit with factory-trimmed 1.050V reset threshold, active-high push-pull RESET output, active-low open-drain RESET output, 150µs reset 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 processors.

For engineers reviewing the MAX6842FUKD0+T datasheet, MAX6842FUKD0+T pinout, MAX6842FUKD0+T application, or MAX6842FUKD0+T equivalent, this device delivers precise low-voltage supervision with dual-output flexibility, ±2.5% threshold accuracy over temperature, guaranteed reset validity down to VCC = 0.55V, and immunity to sub-150ns VCC transients - critical for stable boot sequencing in space-constrained embedded designs.

Technical Context

The MAX6842FUKD0+T integrates a precision voltage comparator with factory-set 1.050V threshold (±2.5% over –40°C to +85°C), fixed 150µs timeout delay (voltage detector configuration), and debounced manual reset input with internal 20kΩ pullup. It operates across VCC = 0.75V to 1.8V and guarantees functional reset assertion down to VCC = 0.55V for active-low outputs.

This variant lacks RESET IN functionality (exclusive to MAX6843–MAX6845), uses BiCMOS process (788 transistors), and supports dual-reset signaling: one active-high push-pull output for direct µP reset assertion and one active-low open-drain output requiring external pullup - enabling level-shifting and bidirectional reset interfacing without additional logic.

Key Specifications

Pinout & Package

Package: 5-pin SOT23-5 (2.9mm × 1.6mm × 1.1mm), lead-free, tape-and-reel.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6842FUKD0+T, MAX6841FUKD0+T offers identical threshold and timing but lacks open-drain flexibility, while TPS3123E10DBVR trades dual outputs and manual reset for lower current and tighter threshold tolerance - making MAX6842FUKD0+T optimal for designs requiring both fast response and interface versatility.

Availability

MAX6842FUKD0+T is available at Aetrix Electronics and suitable for portable medical sensors, industrial PLC I/O modules, 5G small cell baseband processors, and automotive ADAS camera power sequencing requiring stable component supply, long-term lifecycle support, and lead-free compliance.

Supply support for MAX6842FUKD0+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 power management, sensing, and interface applications in industrial, communications, and consumer markets.

The MAX6842FUKD0+T belongs to the MAX6841–MAX6845 ultra-low-voltage µP supervisory family, engineered specifically to replace discrete reset solutions in sub-1.5V digital systems while guaranteeing robustness against supply transients and brownouts.

FAQ

What is the exact reset threshold voltage of the MAX6842FUKD0+T?

The MAX6842FUKD0+T has a factory-trimmed reset threshold of 1.050V, specified with ±2.5% accuracy over the full industrial temperature range (–40°C to +85°C). This value is confirmed in the Threshold Suffix Guide (Table 1) and Electrical Characteristics table under VTH parameter for suffix 'F'. The MAX6842FUKD0+T does not support adjustable threshold - that feature is exclusive to MAX6843–MAX6845 variants.

Does the MAX6842FUKD0+T support manual reset functionality?

Yes, the MAX6842FUKD0+T includes a dedicated MR (manual reset) pin (Pin 4) with internal 20kΩ pullup to VCC. Pulling MR low forces an immediate reset assertion on both RESET outputs, and reset remains active for the full 150µs timeout period after MR returns high. The MR input rejects glitches shorter than 150ns and accepts minimum pulse widths of 1µs, making it robust against mechanical switch bounce.

What are the electrical characteristics of the open-drain RESET output on the MAX6842FUKD0+T?

The open-drain RESET output (Pin 1) on the MAX6842FUKD0+T sinks up to 80µA while asserted (VOL ≤ 0.2 × VCC when VCC ≥ 0.83V), with leakage current <1µA when deasserted. It requires an external pullup resistor connected to any voltage between 0V and VCC (or up to 6V per Absolute Maximum Ratings). This output enables level-shifting and bidirectional reset interfacing - a key differentiator from single-output supervisors.

Can the MAX6842FUKD0+T operate reliably at VCC = 0.75V?

Yes, the MAX6842FUKD0+T is fully specified to operate at VCC = 0.75V (minimum), with guaranteed reset assertion down to VCC = 0.55V for the active-low open-drain output. At 0.75V, supply current is 5.7µA (typ), reset threshold remains within ±2.5% of 1.050V, and MR input logic thresholds scale correctly (VIL = 0.3 × VCC, VIH = 0.7 × VCC). This makes the MAX6842FUKD0+T suitable for emerging sub-1V digital systems.

Is the MAX6842FUKD0+T pin-compatible with other devices in the MAX6841–MAX6845 family?

The MAX6842FUKD0+T shares the same 5-pin SOT23-5 package and pinout as all MAX6841–MAX6845 variants, including identical Pin 1 (RESET), Pin 2 (GND), Pin 3 (RESET), Pin 4 (MR), and Pin 5 (VCC) assignments. However, functional compatibility depends on output configuration: MAX6842FUKD0+T provides active-high push-pull + active-low open-drain, whereas MAX6841FUKD0+T provides active-high + active-low push-pull, and MAX6845FUKD0+T provides only active-low open-drain - so PCB layout is identical, but system-level interface may differ.