Analog Devices Inc./Maxim Integrated MAX6854UK26D3+

Overview

The MAX6854UK26D3+ from Maxim Integrated is a nanopower microprocessor supervisory circuit in a 5-pin SOT23 package, providing voltage monitoring, manual reset input (MR), and fixed 150ms minimum reset timeout. It asserts an active-low open-drain RESET output when VCC drops below its factory-trimmed 2.625V threshold (±2.5%), during MR assertion, or at power-up/brownout - with guaranteed reset validity down to VCC = +1.1V. It targets ultra-low-power portable medical and consumer devices such as glucose monitors and MP3 players.

For engineers reviewing the MAX6854UK26D3+ datasheet, MAX6854UK26D3+ pinout, MAX6854UK26D3+ application, or MAX6854UK26D3+ equivalent, this page delivers verified specifications including 170nA typical supply current, 2.625V reset threshold, 150ms reset timeout, open-drain RESET output, and immunity to sub-40µs VCC transients - all confirmed for the exact MAX6854UK26D3+ variant.

Technical Context

This device implements a precision bandgap-based voltage monitor with 2.5% threshold tolerance and hysteresis of 0.5%VTH, coupled to a digital timeout counter that holds RESET asserted for ≥150ms after VCC exceeds VTH and MR deasserts. Its MR input features 10kΩ internal pullup, 1µs minimum pulse width support, and 200ns glitch rejection.

The open-drain RESET output sinks up to 1.2mA at VCC ≥ 2.38V (VOL ≤ 0.3V) and exhibits <25nA leakage when deasserted. It operates across VCC = 1.2V to 5.5V and guarantees functional reset assertion down to VCC = 1.1V - critical for battery-powered brownout recovery.

Key Specifications

Pinout & Package

Package: 5-pin SOT23-5, lead-free, surface-mount, 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 MAX6361KA26D3+, the MAX6854UK26D3+ uniquely delivers 170nA ICC at 2.625V threshold and 150ms timeout - enabling decade-long operation in battery-constrained medical wearables where every nanoamp matters.

Availability

MAX6854UK26D3+ is available at Aetrix Electronics and suitable for glucose monitors, portable medical sensors, MP3 players, and smart pagers requiring stable component supply with guaranteed long-term availability and traceable sourcing.

Supply support for MAX6854UK26D3+ 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 interface applications in industrial, medical, and consumer markets.

The MAX6854/MAX6855/MAX6856 series was engineered specifically for ultra-low-power microprocessor supervision in battery-critical portable medical and consumer electronics - prioritizing nanoscale ICC, wide VCC range, and robust transient immunity.

FAQ

What is the exact reset threshold voltage of the MAX6854UK26D3+?

The MAX6854UK26D3+ has a factory-trimmed reset threshold voltage of 2.625V, with a guaranteed tolerance of ±2.5% over the -40°C to +85°C temperature range. This value is confirmed in Table 2 (Threshold Suffix Guide) of the datasheet, where suffix "26" corresponds to 2.625V nominal. The device asserts reset when VCC falls below this threshold and maintains reset for ≥150ms after VCC rises above it.

Does the MAX6854UK26D3+ include a watchdog timer function?

No, the MAX6854UK26D3+ 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., MAX6864UK26D3S+), identifiable by the "S" or "L" suffix in the ordering code. The MAX6854UK26D3+ pinout and functional diagram confirm absence of WDI pin.

What is the reset timeout period for the MAX6854UK26D3+ and how is it selected?

The MAX6854UK26D3+ has a fixed minimum reset timeout period of 150ms, indicated by the "D3" suffix in its part number. This value is defined in Table 4 (Reset Timeout Periods) of the datasheet, where D3 corresponds to 150ms (min)/225ms (typ)/300ms (max). Unlike MAX6861–MAX6863 variants, the MAX6854UK26D3+ does not feature a CT pin for dynamic timeout selection - the D3 timeout is hardwired internally.

What type of RESET output does the MAX6854UK26D3+ provide?

The MAX6854UK26D3+ provides an active-low open-drain RESET output, as confirmed by its Selector Guide entry and Pin Description table. This requires an external pullup resistor to the target logic supply (e.g., 3.3V or 1.8V) and enables wired-OR configurations with other supervisors. It differs from MAX6855 (push-pull active-high) and MAX6856 (open-drain active-low with different pin 1 assignment), and is validated for the exact MAX6854UK26D3+ top-mark "AEFZ".

Is the MAX6854UK26D3+ compatible with 1.8V microcontrollers?

Yes, the MAX6854UK26D3+ is fully compatible with 1.8V microcontrollers. Its VCC operating range (1.2V to 5.5V) includes 1.8V, and its open-drain RESET output can be pulled up to 1.8V - ensuring valid logic levels for 1.8V I/O. Electrical characteristics confirm VOL ≤ 0.3V at ISINK = 500µA and VCC ≥ 1.71V, and the device guarantees reset assertion down to VCC = 1.1V, making it suitable for low-voltage brownout protection in 1.8V systems.