Analog Devices Inc./Maxim Integrated MAX6863UK29+T

Overview

The MAX6863UK29+T from Maxim Integrated is a nanopower microprocessor supervisory circuit in a 5-pin SOT23 package, featuring pin-selectable 10ms/150ms reset timeout, active-low open-drain reset output, manual reset input (MR), and factory-trimmed 2.925V reset threshold. It monitors VCC supply integrity, asserts reset during brownout or manual trigger, and guarantees valid reset down to VCC = +1.1V. Used in glucose monitors and portable medical devices requiring ultra-low quiescent current.

For engineers reviewing the MAX6863UK29+T datasheet, MAX6863UK29+T pinout, MAX6863UK29+T application, or MAX6863UK29+T equivalent, key selection criteria include its 170nA typical supply current, 2.925V ±2.5% reset threshold, pin-selectable CT-controlled timeout, immunity to short VCC transients, and compatibility with battery-powered systems operating down to 1.2V.

Technical Context

The MAX6863UK29+T implements a precision voltage monitor with hysteresis (0.5% of VTH) and a configurable reset timeout generator controlled by the CT pin-logic low selects 10ms (min), logic high selects 150ms (min). Its MR input features 10kΩ internal pullup and 1µs minimum pulse width support.

No watchdog timer is present; this variant belongs to the MAX6861–MAX6863 subgroup, which excludes WDI functionality but adds CT-based timeout selection. The open-drain RESET output requires an external pullup and sinks up to 1.2mA at VCC ≥ 2.38V with VOL ≤ 0.3V.

Key Specifications

Pinout & Package

Package: 5-pin SOT23 (lead-free, +T suffix), footprint-compatible with industry-standard 5-lead SOT-23 packages. Thermal performance rated for 571mW at TA = +70°C with 7.1mW/°C derating above.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6861UK29+T and TPS3836K29DBVR, the MAX6863UK29+T uniquely combines ultra-low 170nA current, open-drain flexibility, and field-selectable timeout-making it optimal for next-generation portable medical devices demanding both longevity and design adaptability.

Availability

MAX6863UK29+T is available at Aetrix Electronics and suitable for glucose monitoring systems, patient vital sign monitors, handheld diagnostic tools, and low-power wearable sensors requiring stable component supply across extended production lifecycles.

Supply support for MAX6863UK29+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, medical, and communications applications, emphasizing low-power, high-reliability performance.

The MAX6863UK29+T belongs to the MAX6854–MAX6869 nanopower supervisory family, engineered specifically for battery-constrained medical and portable electronics where sub-microamp quiescent current and guaranteed reset behavior down to 1.1V are mandatory.

FAQ

What is the exact reset threshold voltage of the MAX6863UK29+T?

The MAX6863UK29+T has a factory-trimmed reset threshold of 2.925V with ±2.5% tolerance over temperature (−40°C to +85°C). This value is confirmed in Table 2 (Threshold Suffix Guide) of the datasheet, where suffix "29" corresponds to 2.925V nominal. The device guarantees valid reset assertion down to VCC = +1.1V, independent of threshold accuracy.

How does the CT pin configure the reset timeout on the MAX6863UK29+T?

On the MAX6863UK29+T, the CT pin selects between two minimum reset timeout periods: connecting CT to GND (logic low) configures 10ms (min), while connecting CT to VCC (logic high) configures 150ms (min). These values are specified in Table 1 and validated across temperature. No external resistor or capacitor is needed-the internal logic detects the DC level directly.

Does the MAX6863UK29+T include a watchdog timer function?

No, the MAX6863UK29+T does not include a watchdog timer. It belongs to the MAX6861/MAX6862/MAX6863 subgroup, which features the CT pin for timeout selection but omits the WDI (watchdog input) pin and associated circuitry. Watchdog capability is exclusive to MAX6864–MAX6869 variants, as confirmed in the Selector Guide and Pin Descriptions.

What is the maximum sink current capability of the MAX6863UK29+T's RESET output?

The MAX6863UK29+T's open-drain RESET output sinks up to 1.2mA while maintaining VOL ≤ 0.3V, specified at VCC ≥ 2.38V. At lower VCC (e.g., 1.8V), it sinks 500µA with VOL ≤ 0.3V. This rating ensures robust interfacing with standard CMOS inputs and allows use with pullup resistors as low as ~10kΩ without violating voltage thresholds.

Is the MAX6863UK29+T pin-compatible with the TPS3836 series?

Yes, the MAX6863UK29+T is pin-compatible with the TPS3836/TPS3837/TPS3838 family per the datasheet's Features section, which explicitly states "Pin Compatible to the TPS3836/TPS3837/TPS3838 (MAX6861/MAX6862/MAX6863)". Both use identical 5-pin SOT23 pinouts (VCC, CT/MR, GND, RESET, MR/CT), enabling drop-in replacement where electrical specs align.