Analog Devices Inc./Maxim Integrated MAX6855UK41D5+T

Overview

MAX6855UK41D5+T from Maxim Integrated is a nanopower microprocessor supervisory circuit in 5-pin SOT23 package, featuring ultra-low 170nA typical supply current, factory-trimmed 4.1V reset threshold (±2.5%), and 300ms minimum reset timeout period. It provides active-high push-pull RESET output, manual reset input (MR), and operates across -40°C to +85°C for reliable power-up/brownout monitoring in battery-critical systems.

For engineers reviewing the MAX6855UK41D5+T datasheet, MAX6855UK41D5+T pinout, MAX6855UK41D5+T application, or MAX6855UK41D5+T equivalent, this page delivers verified electrical parameters, validated pin functions, confirmed timing behavior under VCC transients, and real-world substitution guidance - all specific to the exact orderable part with lead-free +T packaging.

Technical Context

The MAX6855UK41D5+T implements a precision voltage monitor with hysteresis (0.5% of VTH) and guaranteed reset validity down to VCC = +1.1V. Its internal timer asserts RESET for ≥300ms after VCC rises above 4.1V or MR deasserts, with MR-to-reset delay ≤250ns and glitch rejection of 200ns.

This variant belongs to the MAX6854–MAX6869 family but excludes watchdog timer (WDI) and CT select functionality. It uses BiCMOS process (2848 transistors), requires no external components, and features an internal 10kΩ MR pullup - enabling direct interface with CMOS logic or open-drain drivers without external biasing.

Key Specifications

Pinout & Package

Package: 5-pin SOT23-5, 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 TPS3837K33DBVR and MAX6326UR31D3+T, the MAX6855UK41D5+T uniquely delivers 4.1V threshold accuracy, nanopower consumption, and active-high push-pull drive - making it optimal for Li-ion-powered medical and portable electronics where voltage alignment and battery longevity are critical.

Availability

MAX6855UK41D5+T is available at Aetrix Electronics and suitable for glucose monitors, patient monitors, MP3 players, and feature phones requiring stable component supply with long-term lifecycle support and lead-free compliance.

Supply support for MAX6855UK41D5+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 MAX6854–MAX6869 family was engineered specifically for ultra-low-power microprocessor supervision in battery-constrained portable equipment - prioritizing nanoscale current draw, factory-trimmed voltage accuracy, and minimal external component dependency.

FAQ

What is the exact reset threshold voltage of MAX6855UK41D5+T?

The MAX6855UK41D5+T has a factory-trimmed reset threshold of 4.100V with ±2.5% tolerance over temperature (-40°C to +85°C), as specified in Table 2 (suffix "41") of the datasheet. This value is laser-trimmed during production and does not require external calibration. The MAX6855UK41D5+T asserts reset when VCC falls below this threshold and holds reset for ≥300ms after VCC rises above it.

Does MAX6855UK41D5+T include a watchdog timer function?

No, the MAX6855UK41D5+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 capability is exclusive to MAX6864–MAX6869 variants (e.g., MAX6864UK16D3S). The MAX6855UK41D5+T pinout omits WDI, confirming absence of watchdog circuitry.

What is the function of Pin 4 on MAX6855UK41D5+T?

Pin 4 on the MAX6855UK41D5+T is a second GND terminal, electrically tied to Pin 2 internally. Its inclusion improves noise immunity and thermal performance in high-density layouts by providing dual ground paths. Unlike variants with I.C. or CT pins, the MAX6855UK41D5+T uses both Pins 2 and 4 exclusively for ground - no configuration or signal routing is required.

Can MAX6855UK41D5+T drive an active-high reset input directly?

Yes, the MAX6855UK41D5+T features an active-high push-pull RESET output (Pin 1), eliminating the need for external pullup resistors. It sources current to drive high (VOH ≥ 0.8×VCC at ISOURCE = 500µA) and sinks current to drive low (VOL ≤ 0.3V at ISINK = 1.2mA), making it fully compatible with µPs requiring active-high reset assertion - such as many ARM Cortex-M and Renesas RL78 devices.

Is MAX6855UK41D5+T compatible with the TPS3837 series?

The MAX6855UK41D5+T is pin-compatible with TPS3836/TPS3837/TPS3838 only in physical SOT23-5 footprint and basic MR/RESET/GND/VCC connectivity. However, functional compatibility is limited: TPS3837K33DBVR has fixed 3.3V threshold and no 4.1V option, and its reset timeout (200ms) differs from the MAX6855UK41D5+T's 300ms (D5). Direct substitution requires validation of threshold alignment and timing margins in the target application.