Analog Devices Inc./Maxim Integrated MAX6865UK17D6L+T

Overview

The MAX6865UK17D6L+T from Maxim Integrated is a nanopower microprocessor supervisory circuit in a 5-pin SOT23 package, featuring ultra-low 170nA typical supply current, a factory-trimmed 1.665V reset threshold (suffix "17"), 1200ms minimum reset timeout (suffix "D6"), and 209s typical watchdog timeout (suffix "L"). It monitors VCC, responds to manual reset (MR), and triggers reset on watchdog timeout (WDI) - ideal for battery-powered glucose monitors and portable medical devices.

For engineers reviewing the MAX6865UK17D6L+T datasheet, MAX6865UK17D6L+T pinout, MAX6865UK17D6L+T application, or MAX6865UK17D6L+T equivalent, key selection criteria include guaranteed reset validity down to VCC = +1.1V, immunity to short VCC transients (<40µs at 100mV overdrive), push-pull active-high RESET output, and compatibility with noisy low-voltage systems requiring long watchdog intervals.

Technical Context

This device 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 after 209s (typ) if inactive - supporting robust firmware recovery in embedded microcontrollers.

The MAX6865UK17D6L+T uses BiCMOS process technology (2848 transistors) and delivers stable operation across -40°C to +85°C. Its push-pull active-high RESET output drives high (≥0.8×VCC) when asserted and sinks ≤0.3V when deasserted, eliminating need for external pullups while ensuring clean logic-level signaling to µP reset inputs.

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 MAX6864UK17D6L+T and TPS3837K33DBVR, the MAX6865UK17D6L+T uniquely combines active-high reset, nanopower consumption, and long-interval watchdog - making it the sole choice for battery-powered medical devices requiring both low quiescent current and firmware fault recovery.

Availability

MAX6865UK17D6L+T is available at Aetrix Electronics and suitable for glucose monitors, patient vital sign loggers, wireless medical telemetry units, and low-power wearable sensors requiring stable component supply across extended production lifecycles.

Supply support for MAX6865UK17D6L+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 industrial, medical, and communications applications.

The MAX6865UK17D6L+T belongs to the MAX68xx nanopower supervisory family, engineered specifically for ultra-long-life battery-operated medical and portable electronics requiring guaranteed reset behavior at sub-1.2V supply levels.

FAQ

What is the exact reset threshold voltage of the MAX6865UK17D6L+T?

The MAX6865UK17D6L+T has a factory-trimmed reset threshold voltage of 1.665V, with ±2.5% tolerance over temperature (-40°C to +85°C). This value is confirmed in Table 2 (Threshold Suffix Guide) of the datasheet, where suffix "17" corresponds to 1.623V (min), 1.665V (typ), and 1.707V (max). The MAX6865UK17D6L+T maintains this specification without external calibration.

Does the MAX6865UK17D6L+T support active-high reset output?

Yes, the MAX6865UK17D6L+T features a push-pull active-high RESET output (pin 1), which drives high during reset assertion and low when deasserted. This is explicitly defined in the MAX6864/MAX6865/MAX6866 Pin Description section and distinguishes it from active-low variants like MAX6864UK17D6L+T. The output is referenced to VCC and guarantees VOH ≥ 0.8×VCC.

What is the watchdog timeout period for the MAX6865UK17D6L+T?

The MAX6865UK17D6L+T provides a typical watchdog timeout period of 209s, with a range of 95s (min) to 487s (max), as specified in Table 3 (Watchdog Timeout) under suffix "L". The timer resets on any rising or falling edge at the WDI pin (pin 4) and expires only if WDI remains static beyond this interval - enabling robust detection of firmware hangs in long-cycle applications.

Can the MAX6865UK17D6L+T operate down to 1.2V supply voltage?

Yes, the MAX6865UK17D6L+T is fully specified to operate from VCC = 1.2V to 5.5V, and its reset function remains guaranteed down to VCC = +1.1V. Electrical Characteristics confirm valid RESET output behavior and 170nA typical supply current at 1.2V–1.8V, making it suitable for single-cell lithium or alkaline battery systems where voltage sags below 1.5V during discharge.

Is an external pullup resistor required for the MR input on the MAX6865UK17D6L+T?

No, the MR input (pin 3) of the MAX6865UK17D6L+T includes an internal 10kΩ pullup resistor to VCC, as documented in the Pin Description and Applications Information sections. This eliminates the need for external components - MR can be left unconnected or tied directly to VCC when unused, and driven low via momentary switch or open-drain logic without additional circuitry.