Analog Devices Inc./Maxim Integrated MAX6863UK17+T

Overview

MAX6863UK17+T from Maxim Integrated is a nanopower microprocessor supervisory circuit in 5-pin SOT23 package, featuring 1.623V factory-trimmed reset threshold, pin-selectable 10ms/150ms (min) reset timeout, active-low open-drain RESET output, manual reset input (MR), and no watchdog timer. It monitors VCC supply integrity for low-power embedded systems such as glucose monitors and portable medical devices.

For engineers reviewing the MAX6863UK17+T datasheet, MAX6863UK17+T pinout, MAX6863UK17+T application, or MAX6863UK17+T equivalent, key selection criteria include its ultra-low 170nA typical supply current, guaranteed reset validity down to VCC = +1.1V, immunity to short VCC transients, and compatibility with battery-powered systems requiring long-term reliability without external components.

Technical Context

The MAX6863UK17+T implements a precision voltage monitor with ±2.5% reset threshold accuracy over temperature, coupled with a configurable reset timeout generator controlled by the CT pin. Its internal 10kΩ MR pullup enables direct CMOS-level manual reset triggering without external biasing.

Unlike watchdog-equipped variants (e.g., MAX6864–MAX6869), this device omits WDI functionality and instead provides pin-selectable reset delay via CT-low selects D1 (10ms min), high selects D3 (150ms min)-enabling flexible power-up sequencing in resource-constrained designs.

Key Specifications

Pinout & Package

Package: 5-pin SOT23 (lead-free, +T suffix), footprint-compatible with industry-standard 5-lead SOT-23 layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS3836K33DBVR and MAX6361LUR29+T, the MAX6863UK17+T uniquely delivers sub-200nA current draw, 1.623V precision threshold, and field-configurable timeout-all in the same 5-pin SOT23 footprint-making it optimal for ultra-low-power medical and portable electronics where battery longevity and brownout resilience are critical.

Availability

MAX6863UK17+T is available at Aetrix Electronics and suitable for glucose monitors, patient monitors, MP3 players, and PDAs requiring stable component supply with long-term lifecycle support and lead-free compliance.

Supply support for MAX6863UK17+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, medical, and consumer markets.

The MAX68xx family targets ultra-low-power microprocessor supervision in battery-critical systems, emphasizing nanopower operation, wide VCC range, and minimal external component count for portable and implantable medical devices.

FAQ

What is the factory-trimmed reset threshold voltage of the MAX6863UK17+T?

The MAX6863UK17+T has a factory-trimmed reset threshold voltage of 1.623V, with ±2.5% tolerance over temperature. This precise threshold ensures reliable detection of brownout conditions in low-voltage systems such as those powered by single-cell lithium or alkaline batteries. The value is confirmed in Table 2 (Threshold Suffix Guide) of the MAX6854–MAX6869 datasheet, where suffix "17" corresponds to 1.623V. The MAX6863UK17+T maintains this specification across its full operating temperature range of -40°C to +85°C.

How does the CT pin configure the reset timeout period on the MAX6863UK17+T?

The CT pin on the MAX6863UK17+T selects between two minimum reset timeout periods: logic low (≤0.2×VCC) selects 10ms (D1), and logic high (≥0.8×VCC) selects 150ms (D3). This selection is effective immediately upon CT state change, though the new timeout applies only after the current reset cycle completes. The MAX6863UK17+T does not require external pull resistors on CT, as its internal logic senses the level directly. This feature eliminates timing resistors and simplifies design versus fixed-time supervisors.

Does the MAX6863UK17+T include a watchdog timer function?

No, the MAX6863UK17+T does not include a watchdog timer. It belongs to the MAX6861/MAX6862/MAX6863 subgroup, which features manual reset (MR) and pin-selectable reset timeout (CT) but omits the WDI input and watchdog circuitry found in MAX6864–MAX6869 variants. The MAX6863UK17+T is strictly a voltage-monitoring and reset-timing device. If watchdog functionality is required, engineers should consider the MAX6864UK17D3S+T or equivalent, which adds watchdog timeout options of 3.3s or 209s.

What is the maximum supply voltage and minimum operating voltage for the MAX6863UK17+T?

The MAX6863UK17+T operates from VCC = 1.2V to 5.5V, with guaranteed functionality across this full range. Critically, its reset output remains valid down to VCC = +1.1V - below the specified minimum operating voltage - ensuring deterministic behavior during deep brownout. This specification is explicitly guaranteed in the Electrical Characteristics table and distinguishes the MAX6863UK17+T from many competitors that lose reset integrity below 1.2V. The 170nA typical supply current is measured at VCC = 1.8V, confirming ultra-low power operation within common low-voltage rails.

Can the MAX6863UK17+T's RESET output drive a microcontroller reset pin directly?

Yes, the MAX6863UK17+T's active-low open-drain RESET output can directly drive most microcontroller reset pins, provided an external pullup resistor is used. The output sinks ≥50µA at VOL ≤ 0.3V (VCC ≥ 1.1V), meeting standard CMOS reset input requirements. For 3.3V MCUs, a 10kΩ pullup to 3.3V is typical; for 1.8V systems, use 4.7kΩ. Unlike push-pull variants, the open-drain structure allows safe connection to mixed-voltage domains and wired-OR reset buses. The MAX6863UK17+T datasheet confirms compatibility with common µP reset inputs and specifies no additional buffering is needed.