Analog Devices Inc./Maxim Integrated MAX6860UK19D2+T

Overview

The MAX6860UK19D2+T from Maxim Integrated is a nanopower microprocessor supervisory circuit in 5-pin SOT23 package, featuring ultra-low 170nA typical supply current, factory-trimmed 1.9V reset threshold (±2.5%), and 40ms minimum reset timeout period. It monitors VCC, provides manual reset input (MR), and asserts active-low push-pull RESET during brownout, power-up, or MR assertion - used in battery-powered glucose monitors and portable medical devices.

For engineers reviewing the MAX6860UK19D2+T datasheet, MAX6860UK19D2+T pinout, MAX6860UK19D2+T application, or MAX6860UK19D2+T equivalent, key selection criteria include guaranteed reset validity down to VCC = +1.1V, immunity to sub-40µs VCC transients, and compatibility with 1.2V–5.5V supply rails in space-constrained portable systems.

Technical Context

This device belongs to the MAX6854–MAX6869 family of nanopower µP supervisors. It implements a precision bandgap-based voltage monitor with 0.5%VTH hysteresis, a digital reset timeout timer with fixed 40ms minimum duration (D2 option), and integrated 10kΩ MR pullup. No external components are required for basic operation.

Unlike watchdog-equipped variants (e.g., MAX6864–MAX6869), the MAX6860UK19D2+T lacks WDI and watchdog functionality. It also omits CT pin - confirming it is not a pin-selectable timeout variant like MAX6861–MAX6863. Its open-drain RESET output requires an external pullup resistor per configuration.

Key Specifications

Pinout & Package

Package: 5-pin SOT23 (lead-free, +T suffix), footprint-compatible with industry-standard 5-lead SOT-23 packages. Thermal pad not present; standard reflow profile applies.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS3836K33DBVR and ADM6806-19ARTZ-R7, the MAX6860UK19D2+T uniquely combines 1.9V threshold, 40ms timeout, MR support, and nanopower 170nA ICC - making it the only viable choice for long-life, low-voltage medical wearables requiring deterministic reset timing and user-initiated reset capability.

Availability

MAX6860UK19D2+T is available at Aetrix Electronics and suitable for glucose monitors, patient vital sign loggers, smart hearing aids, and industrial wireless sensors requiring stable component supply across extended production lifecycles.

Supply support for MAX6860UK19D2+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 high-performance analog and mixed-signal ICs for power, sensing, and interface applications in industrial, medical, and communications markets.

The MAX6854–MAX6869 product line delivers nanopower supervisory circuits optimized for battery longevity and reliability in portable medical and wearable electronics - with emphasis on ultra-low ICC, wide VCC range, and robust noise immunity.

FAQ

What is the exact reset threshold voltage of the MAX6860UK19D2+T?

The MAX6860UK19D2+T has a factory-trimmed reset threshold of 1.9V with ±2.5% tolerance over -40°C to +85°C. This value is confirmed in Table 2 (Threshold Suffix Guide) of the datasheet, where suffix "19" corresponds to nominal 1.9V. The device guarantees reset assertion when VCC falls below this threshold and deassertion after VCC rises above it plus hysteresis.

Does the MAX6860UK19D2+T include a watchdog timer function?

No, the MAX6860UK19D2+T does not include a watchdog timer. Per the Selector Guide and Pin Configurations section, only MAX6864–MAX6869 variants feature WDI input and watchdog timeout functionality. The MAX6860UK19D2+T is a manual-reset-only supervisor with MR input and open-drain RESET output - confirmed by its absence in the WDI column of the Selector Guide.

What is the reset timeout period for the MAX6860UK19D2+T?

The MAX6860UK19D2+T has a 40ms minimum reset timeout period, indicated by the "D2" suffix in its part number. Table 4 confirms D2 corresponds to 40ms (min), 60ms (typ), and 80ms (max). This fixed timeout ensures the microprocessor remains held in reset long enough for power rail stabilization and clock circuit readiness after VCC recovery.

Can the MAX6860UK19D2+T operate with supply voltages below 1.8V?

Yes, the MAX6860UK19D2+T operates from 1.2V to 5.5V and guarantees valid RESET output down to VCC = +1.1V. Electrical Characteristics specify supply voltage range as 1.2V (min) at full temperature range, and Figure 2 (VCC to Reset Delay) shows functional operation at 1.7V with VTH = 1.575V. This makes it suitable for single-cell Li-ion and emerging 1.2V logic systems.

What does the "I.C." pin do on the MAX6860UK19D2+T?

The I.C. (Internally Connected) pin on the MAX6860UK19D2+T must be connected to GND to improve noise immunity, as explicitly stated in the MAX6858/MAX6860 Pin Description section. It is not a functional signal pin but a dedicated bond-wire connection point; leaving it floating may degrade transient rejection performance, particularly in electrically noisy environments like motor-driven or RF-intensive applications.