Analog Devices Inc./Maxim Integrated MAX6863UK22+T

Overview

MAX6863UK22+T from Maxim Integrated is a nanopower microprocessor supervisory circuit in 5-pin SOT23 package, featuring pin-selectable 10ms/150ms (min) reset timeout, active-low open-drain reset output, and manual reset input. It monitors VCC with factory-trimmed 2.235V reset threshold, guarantees valid reset down to VCC = +1.1V, and draws only 170nA typical supply current - ideal for battery-powered glucose monitors and portable medical devices.

For engineers reviewing the MAX6863UK22+T datasheet, MAX6863UK22+T pinout, MAX6863UK22+T application, or MAX6863UK22+T equivalent, key selection criteria include its 2.235V threshold accuracy, CT-pin programmable reset delay, immunity to short VCC transients (<40µs at 100mV overdrive), and compatibility with low-voltage µP systems operating down to 1.2V.

Technical Context

The MAX6863UK22+T implements a precision voltage monitor with ±2.5% threshold tolerance over -40°C to +85°C, coupled with a digital reset timeout generator controlled by the CT pin. Its internal 10kΩ MR pullup enables direct switch interfacing without external components.

Unlike watchdog-equipped variants (e.g., MAX6864–MAX6869), the MAX6863UK22+T omits WDI functionality and instead provides CT-based reset delay selection between D1 (10ms min) and D3 (150ms min) timeout options - confirmed in Table 1 and Pin Description for MAX6861/MAX6862/MAX6863.

Key Specifications

Pinout & Package

MAX6863UK22+T is housed in a RoHS-compliant 5-pin SOT23-5 package (2.9mm × 1.6mm × 1.1mm), optimized for space-constrained portable designs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6861UK22+T, the MAX6863UK22+T's open-drain output enables flexible logic-level interfacing, while versus TPS3836K22DBVR, its 170nA current and CT configurability deliver superior energy efficiency and design adaptability in portable medical electronics.

Availability

MAX6863UK22+T is available at Aetrix Electronics and suitable for glucose monitoring systems, patient vital sign monitors, wearable health trackers, and industrial handheld scanners requiring stable component supply across extended product lifecycles.

Supply support for MAX6863UK22+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, sensing, and connectivity in demanding environments.

The MAX6854–MAX6869 family delivers nanopower supervisory functions for battery-critical applications - engineered specifically for medical wearables, portable diagnostics, and ultra-low-power IoT endpoints where runtime and reliability are non-negotiable.

FAQ

What is the exact reset threshold voltage of the MAX6863UK22+T?

The MAX6863UK22+T features a factory-trimmed reset threshold of 2.235V, with ±2.5% tolerance over the full -40°C to +85°C temperature range. This value is confirmed in Table 2 (Threshold Suffix Guide) where suffix "22" corresponds to 2.235V, and is guaranteed in the Electrical Characteristics table under VTH parameter.

How does the CT pin configure the reset timeout on the MAX6863UK22+T?

On the MAX6863UK22+T, the CT pin selects between two minimum reset timeout periods: connecting CT to GND selects D1 (10ms min), while connecting CT to VCC selects D3 (150ms min). This behavior is explicitly defined in Table 1 and the MAX6861/MAX6862/MAX6863 Pin Description section of the datasheet.

Does the MAX6863UK22+T include a watchdog timer function?

No, the MAX6863UK22+T does not include a watchdog timer. It belongs to the MAX6861/MAX6862/MAX6863 subgroup, which provides only voltage monitoring and manual reset with CT-selectable timeout. Watchdog functionality is exclusive to MAX6864–MAX6869 variants, as confirmed in the Selector Guide and Functional Diagram.

What is the maximum supply voltage the MAX6863UK22+T can monitor?

The MAX6863UK22+T supports a supply voltage range of 1.2V to 5.5V on the VCC pin. Its reset function remains valid down to VCC = +1.1V, and absolute maximum rating allows VCC up to +6.0V - enabling safe use in 3.3V, 2.5V, and 1.8V systems with margin for transient overshoot.

Can the MAX6863UK22+T drive a reset input requiring active-high signaling?

No - the MAX6863UK22+T provides only an active-low open-drain RESET output. To interface with an active-high reset input, an external pullup resistor to the target logic supply must be used, and the host µP must interpret low-to-high transitions as reset deassertion. Active-high push-pull variants (e.g., MAX6862UK22+T) are separate part numbers.