Analog Devices Inc./Maxim Integrated MAX6865UK34D5S+T

Overview

The MAX6865UK34D5S+T from Maxim Integrated is a nanopower microprocessor supervisory circuit in 5-pin SOT23 package, combining voltage monitoring (3.315V ±2.5% reset threshold), manual reset input (MR), and watchdog timer (209s typical timeout) with 170nA typical supply current. It asserts an active-high push-pull RESET signal during VCC brownout, MR assertion, or watchdog timeout, and holds reset for 450ms minimum after recovery - ideal for battery-powered glucose monitors and portable medical devices.

For engineers reviewing the MAX6865UK34D5S+T datasheet, MAX6865UK34D5S+T pinout, MAX6865UK34D5S+T application, or MAX6865UK34D5S+T equivalent, key selection criteria include its guaranteed reset validity down to VCC = +1.1V, immunity to sub-40µs VCC transients, factory-trimmed 3.315V threshold, and compatibility with low-voltage µP systems requiring ultra-low quiescent current and reliable fault detection.

Technical Context

This device integrates a precision bandgap-based voltage monitor, a digital watchdog timer with edge-triggered clearing logic, and an internal 10kΩ MR pullup. The reset assertion path includes hysteresis (0.5% of VTH) and a fixed 450ms timeout (D5 option), while the watchdog responds to WDI transitions with ≤150ns pulse width sensitivity and tolerates temperature drift within ±15% over –40°C to +85°C.

The MAX6865UK34D5S+T uses BiCMOS process technology (2848 transistors) to achieve stable operation across 1.2V–5.5V supply range, with push-pull active-high RESET output referenced to VCC and guaranteed VOL ≤0.3V at ISINK = 1.2mA (VCC ≥2.38V).

Key Specifications

Pinout & Package

Package: 5-pin SOT23 (lead-free, +T suffix), footprint-compatible with industry-standard 5-lead SOT-23 packages.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6864UK34D5S+T and TPS3837K33DBVR, the MAX6865UK34D5S+T uniquely delivers active-high push-pull RESET, 209s watchdog, and 170nA current in one 5-pin SOT23 - enabling simpler, lower-power, and safer supervision in regulated medical and industrial edge devices.

Availability

MAX6865UK34D5S+T is available at Aetrix Electronics and suitable for glucose monitors, patient vital sign recorders, handheld diagnostic tools, and low-power IoT edge sensors requiring stable component supply across extended production lifecycles.

Supply support for MAX6865UK34D5S+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 demanding applications in industrial, medical, and communications markets.

The MAX6865UK34D5S+T belongs to the nanopower µP supervisory family, engineered specifically for battery-critical medical and portable electronics where ultra-low ICC, guaranteed reset validity, and integrated watchdog supervision are essential.

FAQ

What is the exact reset threshold voltage of the MAX6865UK34D5S+T?

The MAX6865UK34D5S+T has a factory-trimmed reset threshold of 3.315V with ±2.5% tolerance over –40°C to +85°C, corresponding to the "34" suffix in its part number per Maxim's Threshold Suffix Guide. This value is laser-trimmed during production and does not require external calibration.

Does the MAX6865UK34D5S+T support active-high reset output?

Yes, the MAX6865UK34D5S+T provides a push-pull active-high RESET output (Pin 1), which transitions high during fault conditions and remains asserted for the full 450ms timeout period. This eliminates the need for external pullup resistors and simplifies interfacing with µPs that require active-high reset signaling.

What is the watchdog timeout period for the MAX6865UK34D5S+T?

The MAX6865UK34D5S+T features a watchdog timeout period of 209s (typical), denoted by the "S" suffix in its ordering code. This long-duration timeout is optimized for systems where firmware tasks execute infrequently, such as periodic sensor reads or wireless transmissions in battery-constrained devices.

Can the MAX6865UK34D5S+T operate reliably below 1.8V?

Yes, the MAX6865UK34D5S+T operates across 1.2V to 5.5V and guarantees valid reset assertion down to VCC = +1.1V. Its 170nA typical supply current at 1.8V and stable performance at 1.2V make it suitable for single-cell LiFePO₄ or alkaline battery systems experiencing deep discharge.

How is the reset timeout period configured on the MAX6865UK34D5S+T?

The reset timeout period is fixed at 450ms (minimum) for the MAX6865UK34D5S+T, indicated by the "D5" suffix. Unlike pin-selectable variants (e.g., MAX6861–MAX6863), this parameter is factory-programmed and requires no external components or configuration pins - ensuring consistent timing behavior across all units.