Analog Devices Inc./Maxim Integrated MAX6863UK30+T

Overview

The MAX6863UK30+T from Maxim Integrated is a nanopower microprocessor supervisory circuit in a 5-pin SOT23 package, featuring pin-selectable 10ms/150ms (min) reset timeout, +3.000V factory-trimmed reset threshold, and active-low open-drain reset output. It monitors VCC for brownout detection, responds to manual reset assertion, and guarantees valid reset operation down to VCC = +1.1V - ideal for battery-powered glucose monitors and portable medical devices.

For engineers reviewing the MAX6863UK30+T datasheet, MAX6863UK30+T pinout, MAX6863UK30+T application, or MAX6863UK30+T equivalent, key selection criteria include its ultra-low 170nA typical supply current, immunity to short VCC transients, pin-selectable reset delay via CT input, and compatibility with 1.2V–5.5V supply rails in space-constrained embedded systems.

Technical Context

This device belongs to the MAX6854–MAX6869 family of nanopower µP supervisors. It implements a precision voltage monitor with ±2.5% threshold accuracy over temperature, a fixed-reset-timeout generator (D1/D3 selectable), and a manual reset input with 250ns propagation delay and 1µs minimum pulse width.

Unlike watchdog-equipped variants (e.g., MAX6864–MAX6869), the MAX6863UK30+T omits WDI functionality and instead provides the CT pin to select between 10ms (CT = low) or 150ms (CT = high) minimum reset timeout periods - a hardware-configurable feature enabling design flexibility without firmware dependency.

Key Specifications

Pinout & Package

Package: 5-pin SOT23 (lead-free, RoHS-compliant). Compact footprint (2.9mm × 1.6mm × 1.1mm) suitable for wearables and handheld diagnostics.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6861UK30+T and TPS3836K33DBVR, the MAX6863UK30+T uniquely balances ultra-low power (170nA), open-drain flexibility, and hardware-selectable timeout - making it optimal for long-life, multi-voltage, and space-constrained medical wearables where reset bus sharing or level translation is required.

Availability

MAX6863UK30+T is available at Aetrix Electronics and suitable for glucose monitors, patient vital sign loggers, handheld diagnostic tools, and wearable health sensors requiring stable component supply across extended production lifecycles.

Supply support for MAX6863UK30+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 demanding industrial, medical, and communications applications.

The MAX6854–MAX6869 family was engineered specifically for ultra-low-power microprocessor supervision in battery-critical medical and portable electronics - emphasizing nanoscale current consumption, robust transient immunity, and flexible reset timing.

FAQ

What is the exact reset threshold voltage of the MAX6863UK30+T?

The MAX6863UK30+T has a factory-trimmed reset threshold of +3.000V, with guaranteed accuracy of ±2.5% over the full operating temperature range (-40°C to +85°C). This value is confirmed in Table 2 (Threshold Suffix Guide) of the datasheet, where suffix "30" corresponds to 3.000V nominal. The MAX6863UK30+T maintains this specification without external calibration or trimming components.

Does the MAX6863UK30+T include a watchdog timer function?

No, the MAX6863UK30+T does not include a watchdog timer. It belongs to the MAX6861/MAX6862/MAX6863 subgroup, which features the CT pin for reset timeout selection but omits the WDI input and associated watchdog circuitry. Watchdog capability is exclusive to MAX6864–MAX6869 variants. The MAX6863UK30+T relies solely on VCC monitoring and manual reset (MR) for fault recovery.

How is the reset timeout period selected on the MAX6863UK30+T?

The MAX6863UK30+T uses the CT pin (Pin 4) to select between two minimum reset timeout periods: 10ms (when CT is connected to GND or held <0.2×VCC) or 150ms (when CT is connected to VCC or held >0.8×VCC). This selection is hardware-based and takes effect immediately upon CT state change - no configuration registers or firmware interaction is needed. The MAX6863UK30+T datasheet specifies these values in Table 1 and Figure 1.

What type of reset output does the MAX6863UK30+T provide?

The MAX6863UK30+T provides an active-low open-drain RESET output (Pin 1). It requires an external pullup resistor to the target logic voltage (e.g., 1.8V, 3.0V, or 3.3V) and can interface across voltage domains. This differs from push-pull variants (e.g., MAX6861UK30+T) and enables wired-OR reset busing. The MAX6863UK30+T's open-drain architecture is explicitly defined in its Pin Description table and Selector Guide.

Is the MAX6863UK30+T compatible with 1.2V supply systems?

Yes, the MAX6863UK30+T operates across 1.2V to 5.5V supply rails and guarantees valid reset assertion down to VCC = +1.1V. Its 170nA typical supply current at 1.8V and functional specification down to 1.2V make it suitable for ultra-low-voltage systems such as energy-harvesting sensors or single-cell NiMH-powered devices. This capability is verified in the Electrical Characteristics table under "Supply Voltage" and "VCC Reset Threshold" parameters.