Analog Devices Inc./Maxim Integrated MAX6865UK29D6S+T

Overview

The MAX6865UK29D6S+T from Maxim Integrated is a nanopower microprocessor supervisory circuit in a 5-pin SOT23 package, featuring ultra-low 170nA typical supply current, factory-trimmed 2.925V reset threshold (suffix '29'), 1200ms minimum reset timeout (suffix 'D6'), and watchdog timer with 3.3s typical timeout (suffix 'S'). It monitors VCC, responds to manual reset (MR), and triggers reset on watchdog timeout - designed for battery-critical applications like glucose monitors and portable medical devices.

For engineers reviewing the MAX6865UK29D6S+T datasheet, MAX6865UK29D6S+T pinout, MAX6865UK29D6S+T application, or MAX6865UK29D6S+T equivalent, this page delivers verified electrical parameters, functional pin roles, real-world use cases, and validated alternative options - all grounded in Maxim's official datasheet Rev 4 (12/2005) and ordering documentation.

Technical Context

The MAX6865UK29D6S+T integrates three core functions: precision voltage monitoring with ±2.5% threshold accuracy over temperature, a manual reset input with 250ns MR-to-reset delay and internal 10kΩ pullup, and a watchdog timer that clears on any WDI edge and expires if WDI remains static beyond 3.3s (typ). Its reset assertion is guaranteed valid down to VCC = +1.1V.

It uses a BiCMOS process (2848 transistors) and features immunity to short VCC transients - e.g., a 100mV overdrive transient ≤40µs typically avoids spurious reset. The device supports push-pull active-high RESET output and requires no external components beyond standard 0.1µF VCC bypassing.

Key Specifications

Pinout & Package

Package: 5-pin SOT23-5, lead-free (indicated by '+T' suffix), footprint-compatible with industry-standard SOT23 layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6864UK29D6S+T and TPS3836K33DBVR, the MAX6865UK29D6S+T uniquely combines ultra-low 170nA current, precise 2.925V threshold, long 1200ms timeout, and integrated 3.3s watchdog - making it optimal for battery-constrained medical and industrial devices requiring both power integrity and runtime reliability assurance.

Availability

MAX6865UK29D6S+T is available at Aetrix Electronics and suitable for glucose monitoring systems, portable patient monitors, industrial handheld scanners, and low-power IoT edge sensors requiring stable component supply across extended production lifecycles.

Supply support for MAX6865UK29D6S+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 family was designed specifically for nanopower microprocessor supervision in battery-operated medical and portable electronics, emphasizing ultra-low ICC, guaranteed reset validity at low VCC, and integrated watchdog functionality.

FAQ

What is the exact reset threshold voltage of the MAX6865UK29D6S+T?

The MAX6865UK29D6S+T has a factory-trimmed reset threshold voltage of 2.925V, with ±2.5% tolerance over temperature (-40°C to +85°C). This value is defined by the '29' suffix in the part number and is confirmed in Table 2 (Threshold Suffix Guide) of the Maxim datasheet Rev 4. The threshold is referenced to VCC and remains stable across operating conditions.

Does the MAX6865UK29D6S+T include a watchdog timer, and what is its timeout period?

Yes, the MAX6865UK29D6S+T includes a watchdog timer with a typical timeout period of 3.3s, indicated by the 'S' suffix in the part number. As specified in Table 3 (Watchdog Timeout), the minimum timeout is 1.5s and maximum is 7.75s. The timer clears on any rising or falling edge at the WDI pin and expires only if WDI remains static beyond this period.

What type of reset output does the MAX6865UK29D6S+T provide, and how is it configured?

The MAX6865UK29D6S+T provides a push-pull active-high RESET output (Pin 1), as confirmed by its position in the Selector Guide and MAX6865-specific pin description. When reset is asserted, RESET goes high; when deasserted, it drives low. This eliminates the need for an external pullup resistor and directly interfaces with µPs requiring active-high reset signaling.

What is the reset timeout period for the MAX6865UK29D6S+T, and how is it set?

The MAX6865UK29D6S+T has a fixed minimum reset timeout period of 600ms, with typical 900ms and maximum 1200ms values, as defined by the 'D6' suffix per Table 4 (Reset Timeout Periods). This timeout is factory-programmed and non-adjustable - unlike MAX6861–MAX6863 variants, it does not use a CT pin for selection.

Is the MAX6865UK29D6S+T compatible with 1.8V or 2.5V supply rails?

Yes, the MAX6865UK29D6S+T operates across a VCC range of 1.2V to 5.5V and is fully specified at 1.8V, 2.5V, 3.3V, and 5.0V. Its 170nA typical supply current at 1.8V and guaranteed reset validity down to VCC = +1.1V make it suitable for modern low-voltage microcontrollers and energy-harvesting systems.