Analog Devices Inc./Maxim Integrated MAX6855UK23D2+T

Overview

The MAX6855UK23D2+T from Maxim Integrated is a nanopower microprocessor supervisory circuit in a 5-pin SOT23 package, providing voltage monitoring, manual reset input (MR), and reset assertion with 2.23V factory-trimmed threshold and 40ms minimum timeout. It asserts an active-high push-pull RESET output when VCC drops below threshold or MR is pulled low, and guarantees valid reset operation down to VCC = +1.1V. It targets ultra-low-power portable systems such as glucose monitors and battery-powered PDAs.

For engineers reviewing the MAX6855UK23D2+T datasheet, MAX6855UK23D2+T pinout, MAX6855UK23D2+T application, or MAX6855UK23D2+T equivalent, this page delivers verified functional identity, exact reset threshold and timeout values, confirmed pin roles, real-world use cases in medical and portable electronics, and two validated alternative parts with documented technical differences.

Technical Context

This device implements a precision bandgap-based voltage monitor with ±2.5% threshold accuracy over -40°C to +85°C, coupled with a digital reset timeout timer and CMOS-compatible manual reset input with 10kΩ internal pullup. Its active-high push-pull RESET output drives directly to VCC and maintains logic-level integrity without external components.

The MAX6855UK23D2+T belongs to the MAX6854–MAX6869 family and excludes watchdog timer (WDI) and CT select functionality - it is a fixed-threshold, fixed-timeout, MR-enabled supervisory IC with no programmable timing inputs. Its design centers on deterministic power-on reset generation under brownout conditions in space-constrained, battery-sensitive applications.

Key Specifications

Pinout & Package

Package: 5-pin SOT23-5, surface-mount, lead-free (RoHS-compliant), footprint compatible with industry-standard 5-pin SOT23 layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS3836K33DBVR and MAX6316LUK23D2+T, the MAX6855UK23D2+T uniquely combines ultra-low 170nA supply current, active-high push-pull RESET (no pullup needed), and integrated MR - making it optimal for new designs prioritizing battery life, simplicity, and user-serviceability in portable medical and industrial equipment.

Availability

MAX6855UK23D2+T is available at Aetrix Electronics and suitable for glucose monitoring systems, patient vital sign monitors, industrial handheld scanners, and smart wearable sensors requiring stable component supply with guaranteed long-term availability.

Supply support for MAX6855UK23D2+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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, medical, and communications applications.

The MAX6854–MAX6869 product line was designed specifically for nanopower, space-constrained supervisory functions in battery-operated medical and portable electronics - emphasizing sub-µA quiescent current, guaranteed low-VCC operation, and minimal external component count.

FAQ

What is the exact reset threshold voltage of the MAX6855UK23D2+T?

The MAX6855UK23D2+T has a factory-trimmed reset threshold voltage of 2.23V, with ±2.5% tolerance over the full -40°C to +85°C temperature range. This value is confirmed in Table 2 (Threshold Suffix Guide) of the datasheet, where suffix "23" corresponds to 2.23V nominal. The MAX6855UK23D2+T maintains this precision without calibration or external components.

Does the MAX6855UK23D2+T include a watchdog timer function?

No, the MAX6855UK23D2+T does not include a watchdog timer. It belongs to the MAX6854/MAX6855/MAX6856 subgroup, which provides only voltage monitoring and manual reset (MR) functionality. Watchdog timer capability is exclusive to MAX6864–MAX6869 variants, as clearly indicated in the Selector Guide and Pin Descriptions sections of the datasheet.

What is the reset timeout period for the MAX6855UK23D2+T?

MAX6855UK23D2+T features a 40ms minimum reset timeout period (D2 option), as specified in Table 4 (Reset Timeout Periods) of the datasheet. This ensures the active-high RESET signal remains asserted for at least 40ms after VCC rises above 2.23V and MR is deasserted - sufficient for stable power rail settling in low-power µP systems.

What type of reset output does the MAX6855UK23D2+T provide?

The MAX6855UK23D2+T provides an active-high push-pull RESET output, as confirmed in the MAX6854/MAX6855/MAX6856 Pin Description table (Pin 1 function). This eliminates the need for an external pullup resistor and allows direct interfacing with µP reset inputs expecting high-active assertion, unlike open-drain or active-low variants in the same family.

Is the MAX6855UK23D2+T RoHS-compliant and lead-free?

Yes, the "+T" suffix in MAX6855UK23D2+T explicitly denotes lead-free, RoHS-compliant packaging per Maxim's ordering conventions. The datasheet states: "Specify lead-free by replacing '-T' with '+T' when ordering," confirming that MAX6855UK23D2+T meets JEDEC J-STD-020 moisture sensitivity and RoHS Directive 2011/65/EU requirements.