Analog Devices Inc./Maxim Integrated MAX6854UK45D1+T

Overview

MAX6854UK45D1+T from Maxim Integrated is a nanopower microprocessor supervisory circuit in 5-pin SOT23 package, providing voltage monitoring, manual reset input (MR), and fixed 10ms minimum reset timeout. It asserts an active-low open-drain RESET output when VCC drops below 4.500V (typ), MR is pulled low, or during power-up/brownout - used in battery-powered medical and portable electronics for reliable cold-start and fault recovery.

For engineers reviewing the MAX6854UK45D1+T datasheet, MAX6854UK45D1+T pinout, MAX6854UK45D1+T application, or MAX6854UK45D1+T equivalent, this page delivers verified electrical parameters, SOT23-5 terminal mapping, real-world use cases in glucose monitors and PDAs, and two validated alternative parts with documented functional trade-offs.

Technical Context

The MAX6854UK45D1+T integrates a precision voltage comparator with factory-trimmed 4.500V ±2.5% reset threshold, a 10ms (min) internal reset timeout timer, and a CMOS-compatible manual reset input with 10kΩ internal pullup. It operates across 1.2V to 5.5V supply range and guarantees valid RESET assertion down to VCC = +1.1V.

No watchdog timer or CT pin is present - this variant belongs to the base MAX6854 family (not MAX686x), confirming absence of WDI input and pin-selectable timeout. Its open-drain RESET output requires an external pullup resistor and supports logic-level interfacing up to 5.5V.

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 ADM6806-45ARTZ-R7, the MAX6854UK45D1+T uniquely balances ultra-low 170nA supply current, 4.500V precision threshold, and 10ms fast timeout - making it optimal for space-constrained, battery-critical medical and portable designs where every nanoamp matters.

Availability

MAX6854UK45D1+T is available at Aetrix Electronics and suitable for glucose monitors, patient monitors, and portable audio devices requiring stable component supply with long-term lifecycle support and RoHS-compliant packaging.

Supply support for MAX6854UK45D1+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 interface applications in industrial, medical, and communications markets.

The MAX6854 series targets ultra-low-power microprocessor supervision in battery-operated equipment, emphasizing nanoscale current consumption, factory-trimmed accuracy, and minimal external component count.

FAQ

What is the exact reset threshold voltage of the MAX6854UK45D1+T?

The MAX6854UK45D1+T has a factory-trimmed reset threshold of +4.500V (typical), with ±2.5% tolerance over temperature (–40°C to +85°C). This corresponds to the "45" suffix in the part number per Maxim's Threshold Suffix Guide (Table 2), specifying a min/max range of 4.388V to 4.613V. The MAX6854UK45D1+T uses this precise threshold to supervise 4.5V or 5V rails in portable medical devices.

Does the MAX6854UK45D1+T include a watchdog timer function?

No, the MAX6854UK45D1+T does not include a watchdog timer. It belongs to the base MAX6854 family (not MAX6864–MAX6869), and its pinout lacks a WDI input. The device provides only voltage monitoring, manual reset (MR), and fixed 10ms reset timeout. Watchdog functionality is exclusive to MAX6864–MAX6869 variants, confirmed by the Selector Guide and Pin Descriptions in the datasheet.

What type of RESET output does the MAX6854UK45D1+T provide?

The MAX6854UK45D1+T provides an active-low open-drain RESET output (Pin 1), requiring an external pullup resistor to the target logic rail (e.g., 3.3V or 5V). This configuration enables wired-OR reset bus sharing and voltage-level translation. Unlike push-pull variants (e.g., MAX6855), it cannot source current - only sink - which is explicitly defined in the MAX6854/MAX6856 Pin Description section.

What is the minimum reset timeout period for the MAX6854UK45D1+T?

The MAX6854UK45D1+T has a minimum reset timeout period of 10ms (D1 option), with typical and maximum values of 15ms and 25ms respectively. This is encoded in the "D1" suffix of the part number and confirmed in Table 4 (Reset Timeout Periods). The timeout begins after VCC rises above the 4.500V threshold and MR is deasserted, ensuring sufficient hold time for microprocessor initialization.

Is the MAX6854UK45D1+T pin-compatible with other supervisory ICs?

The MAX6854UK45D1+T is pin-compatible with the TPS3836/TPS3837/TPS3838 family per the datasheet Features section, sharing identical 5-pin SOT23-5 layout and GND–MR–VCC–GND–RESET pin order. However, electrical differences exist - including reset threshold, timeout, and output type - so direct substitution requires validation of timing and voltage compatibility in the target application.