Analog Devices Inc./Maxim Integrated MAX6860UK18D2+T

Overview

The MAX6860UK18D2+T from Maxim Integrated is a nanopower microprocessor supervisory circuit in a 5-pin SOT23 package, featuring ultra-low 170nA typical supply current, factory-trimmed 1.8V reset threshold (±2.5%), and 40ms minimum reset timeout period. It monitors VCC, provides manual reset input (MR), and asserts an active-low push-pull RESET output - designed for reliable power-up/brownout detection in battery-critical systems like glucose monitors and portable medical devices.

For engineers reviewing the MAX6860UK18D2+T datasheet, MAX6860UK18D2+T pinout, MAX6860UK18D2+T application, or MAX6860UK18D2+T equivalent, key selection criteria include its guaranteed reset validity down to VCC = +1.1V, immunity to short VCC transients (<40µs at 100mV overdrive), and compatibility with 1.2V–5.5V supply rails without external components.

Technical Context

The MAX6860UK18D2+T implements a precision voltage monitor with hysteresis (0.5% of VTH) and a fixed-reset-timer architecture that holds RESET asserted for ≥40ms after VCC rises above 1.8V and MR deasserts. Its internal 10kΩ MR pullup enables direct interface with momentary switches or CMOS logic, eliminating external biasing.

No watchdog timer or CT pin is present - consistent with MAX6860's configuration per the Selector Guide. The device uses BiCMOS process technology (2848 transistors) and operates across –40°C to +85°C, with absolute maximum VCC rating of +6.0V and guaranteed functionality down to VCC = +1.1V.

Key Specifications

Pinout & Package

Package: 5-pin SOT23-5, lead-free, surface-mount. Pin 1 is I.C. (internally connected), pin 2 and 3 are GND, pin 4 is RESET, pin 5 is VCC.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS3836K33DBVR and ADM6806-18ARTZ-R7, the MAX6860UK18D2+T delivers 7× lower supply current and integrated MR - making it uniquely suited for long-life, user-serviceable portable medical devices where both power efficiency and field recoverability are mandatory.

Availability

MAX6860UK18D2+T is available at Aetrix Electronics and suitable for glucose monitors, patient monitoring devices, smart wearables, and industrial handheld terminals requiring stable component supply across extended production lifecycles.

Supply support for MAX6860UK18D2+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 applications in industrial, medical, and automotive markets.

The MAX6854–MAX6869 family was engineered specifically for nanopower supervisory functions in battery-constrained portable electronics - prioritizing sub-µA quiescent current, wide VCC range, and robust reset timing without external components.

FAQ

What is the exact reset threshold voltage of the MAX6860UK18D2+T?

The MAX6860UK18D2+T has a factory-trimmed reset threshold of 1.8V with ±2.5% tolerance over temperature (–40°C to +85°C). This value is confirmed in Table 2 (Threshold Suffix Guide) where suffix "18" corresponds to 1.755V (min), 1.800V (typ), and 1.845V (max). The device guarantees reset assertion when VCC falls below this threshold and deassertion only after VCC exceeds it plus hysteresis (0.5% of VTH).

Does the MAX6860UK18D2+T include a watchdog timer?

No, the MAX6860UK18D2+T does not include a watchdog timer. Per the Selector Guide and Pin Configurations section, MAX6860 belongs to the non-watchdog subgroup (alongside MAX6858/MAX6860), featuring only VCC monitoring and manual reset (MR) functions. Watchdog capability is exclusive to MAX6864–MAX6869 variants, which include WDI pin and timeout suffixes (S/L) in their ordering codes.

What is the function of Pin 1 (I.C.) on the MAX6860UK18D2+T?

Pin 1 on the MAX6860UK18D2+T is labeled "I.C." (Internally Connected) and is not electrically accessible. The datasheet recommends connecting it to GND to improve noise immunity in electrically noisy environments. This connection does not affect functionality but reduces susceptibility to VCC transients - a design practice validated in the Typical Operating Circuit and Pin Configurations diagrams.

Can the MAX6860UK18D2+T operate with a 1.2V supply?

Yes, the MAX6860UK18D2+T operates with VCC as low as 1.2V (absolute minimum per Electrical Characteristics table) and guarantees valid RESET output down to VCC = +1.1V. At 1.2V, its supply current remains ultra-low (190nA typ), and VOL stays ≤0.3V with 50µA sink load - enabling interoperability with 1.2V logic families and ultra-low-voltage energy harvesting systems.

Is the MAX6860UK18D2+T pin-compatible with other MAX68xx supervisory ICs?

The MAX6860UK18D2+T shares the same 5-pin SOT23-5 package and pinout (I.C., GND, GND, RESET, VCC) with MAX6858 and MAX6860 variants, but differs from MAX6854/MAX6855/MAX6856 (which use MR instead of I.C. on Pin 1) and MAX6864–MAX6869 (which use WDI on Pin 1). Direct PCB replacement is only possible with MAX6858UKxxDx+T or MAX6860UKxxDx+T variants - not with MR- or WDI-equipped versions.