Analog Devices Inc./Maxim Integrated MAX6842DUKD3+T

Overview

MAX6842DUKD3+T from Maxim Integrated is an ultra-low-voltage microprocessor supervisory circuit with factory-trimmed 0.788V reset threshold, 210ms reset timeout (typ), active-high push-pull and active-low open-drain RESET outputs, manual reset input (MR), and operation down to VCC = 0.55V. It monitors +0.9V to +1.5V power supplies in portable microcontroller systems requiring reliable brownout detection and reset assertion during power-up/down.

For engineers reviewing the MAX6842DUKD3+T datasheet, MAX6842DUKD3+T pinout, MAX6842DUKD3+T application, or MAX6842DUKD3+T equivalent, this device delivers precise low-voltage supervision with dual-output flexibility, 5.7µA supply current, ±2.5% threshold accuracy over temperature, and immunity to sub-150ns VCC transients - critical for battery-powered instrumentation and telecom baseband ICs.

Technical Context

The MAX6842DUKD3+T implements a precision voltage comparator with internal 0.788V reference, fixed 210ms timeout timer, and dual-output stage supporting simultaneous active-high push-pull and active-low open-drain signaling. Its MR input features a 20kΩ internal pullup and 1µs minimum pulse width requirement.

Reset assertion occurs when VCC falls below 0.788V (±2.5% over –40°C to +85°C) or MR is pulled low; reset remains asserted for 210ms after VCC rises above threshold and MR is released. The open-drain output requires an external pullup and supports level-shifting to voltages up to 6V.

Key Specifications

Pinout & Package

Package: 5-pin SOT23-5, surface-mount, lead-free (RoHS-compliant), footprint compatible with industry-standard SOT-23-5 land pattern.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6841DUKD3+T, the MAX6842DUKD3+T adds open-drain output for bidirectional µP interfacing and level shifting, while TPS3123DQDBVR reduces ICC by 72% but omits MR and dual outputs - making MAX6842DUKD3+T optimal for systems needing robust manual intervention and mixed-voltage reset signaling.

Availability

MAX6842DUKD3+T is available at Aetrix Electronics and suitable for portable medical sensors, industrial PLC I/O modules, 5G small cell baseband units, and battery-powered smart meters requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MAX6842DUKD3+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, automotive, and communications markets.

The MAX6842DUKD3+T belongs to the MAX6841–MAX6845 family of ultra-low-voltage µP supervisors, engineered specifically for reliable reset generation in sub-1.5V digital systems where traditional supervisors fail to operate.

FAQ

What is the exact reset threshold voltage of the MAX6842DUKD3+T?

The MAX6842DUKD3+T has a factory-trimmed reset threshold of 0.788V, with ±2.5% accuracy over the full –40°C to +85°C operating temperature range. This value is confirmed in the Electrical Characteristics table under "Reset Threshold (VCC Falling)" for suffix D, and applies specifically to the MAX6842 variant with UKD3 ordering code.

Does the MAX6842DUKD3+T support operation below 0.9V supply voltage?

Yes, the MAX6842DUKD3+T operates and asserts a valid reset signal down to VCC = 0.55V, as guaranteed in the Absolute Maximum Ratings and Electrical Characteristics sections. Its active-low open-drain RESET output remains functional at 0.55V, and the push-pull RESET output is valid to VCC = 0.75V.

How does the manual reset (MR) input function on the MAX6842DUKD3+T?

The MR input on the MAX6842DUKD3+T is an active-low signal with an internal 20kΩ pullup to VCC. Pulling MR low forces immediate reset assertion; reset remains active for the full 210ms timeout period after MR returns high. No external debounce components are required due to built-in glitch rejection of 150ns pulses.

What is the purpose of the dual RESET outputs on the MAX6842DUKD3+T?

The MAX6842DUKD3+T provides both an active-high push-pull RESET and an active-low open-drain RESET to support diverse system architectures. The push-pull output drives standard CMOS inputs directly, while the open-drain output enables level shifting, wired-OR reset buses, and direct interfacing with µPs having bidirectional reset pins - all without external logic.

Can the MAX6842DUKD3+T be used in lead-free assembly processes?

Yes, the MAX6842DUKD3+T is offered in lead-free packaging, as indicated by the "+T" suffix in the part number. It complies with RoHS requirements and is qualified for standard Pb-free reflow profiles, including peak temperatures up to +260°C per JEDEC J-STD-020.