Analog Devices Inc./Maxim Integrated MAX6865UK32D6L+T

Overview

The MAX6865UK32D6L+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 3.2V reset threshold (±2.5%), and a 1200ms minimum reset timeout period. It integrates voltage monitoring, manual reset input (MR), and watchdog timer with 209s typical timeout (L-suffix), and asserts an active-high push-pull RESET output. It is designed for reliable power-up/brownout supervision in battery-powered medical and portable electronics.

For engineers reviewing the MAX6865UK32D6L+T datasheet, MAX6865UK32D6L+T pinout, MAX6865UK32D6L+T application, or MAX6865UK32D6L+T equivalent, this page delivers verified functional identity, confirmed pin roles, exact reset timing behavior, watchdog interaction logic, and validated alternative options - all aligned to Maxim's official specifications for the precise part number.

Technical Context

The MAX6865UK32D6L+T implements a dual-trigger reset architecture: it asserts RESET when VCC falls below 3.2V, when MR is pulled low, or when the watchdog timer expires after 209s (typ) of WDI inactivity. Its internal watchdog clears on any WDI edge, MR assertion, or RESET assertion, ensuring robust software execution monitoring.

It guarantees valid RESET operation down to VCC = +1.1V, features 250ns MR-to-reset delay, and provides immunity to VCC transients ≤40µs at 100mV overdrive. The active-high push-pull RESET output sources ≥500µA at 0.8×VCC (VCC ≥2.38V) and sinks ≤0.3V at 1.2mA (VCC ≥2.38V).

Key Specifications

Pinout & Package

Package: 5-pin SOT23-5, lead-free (RoHS-compliant), footprint-compatible with industry-standard 5-lead SOT packages.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6864UK32D6L+T, the MAX6865UK32D6L+T provides active-high RESET compatibility without external inversion; versus TPS3838K33DBVR, it adds critical watchdog supervision and extends timeout for complex boot sequences - both at 1/10th the supply current.

Availability

MAX6865UK32D6L+T is available at Aetrix Electronics and suitable for glucose monitors, patient vital sign loggers, industrial handheld scanners, and smart wearable health trackers requiring stable component supply across extended production lifecycles.

Supply support for MAX6865UK32D6L+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 MAX6865UK32D6L+T belongs to Maxim's nanopower µP supervisory family, engineered specifically for ultra-low-power, safety-critical battery-operated medical and portable electronics where long-term reliability and deterministic reset behavior are mandatory.

FAQ

What is the exact reset threshold voltage of the MAX6865UK32D6L+T?

The MAX6865UK32D6L+T has a factory-trimmed reset threshold of 3.200V, with guaranteed tolerance of ±2.5% (i.e., 3.120V to 3.280V) over -40°C to +85°C. This value is defined by the "32" suffix in the part number per Maxim's Threshold Suffix Guide (Table 2), and is confirmed in the Electrical Characteristics table under VTH parameter.

Does the MAX6865UK32D6L+T include a watchdog timer, and what is its timeout?

Yes, the MAX6865UK32D6L+T includes a watchdog timer with a typical timeout of 209 seconds, indicated by the "L" suffix in the part number. This is verified in Table 3 (Watchdog Timeout) and the Ordering Information section, which specifies L = 95s/209s/487s (min/typ/max). The timer resets on any WDI edge, MR assertion, or RESET assertion.

What type of RESET output does the MAX6865UK32D6L+T provide?

The MAX6865UK32D6L+T provides an active-high push-pull RESET output, as confirmed in the Pin Description section for MAX6865 and the Selector Guide. This means RESET goes high during fault conditions and remains high for the full D6 timeout period (600–1200ms) before returning low - eliminating need for external pullup resistors.

What is the minimum supply voltage at which the MAX6865UK32D6L+T guarantees valid RESET assertion?

The MAX6865UK32D6L+T guarantees valid RESET assertion down to VCC = +1.1V, as explicitly stated in the Features list ("Guaranteed Reset Valid to VCC = +1.1V") and confirmed in the Electrical Characteristics table under the RESET Output Voltage (VOH/VOL) conditions. This ensures deterministic behavior during deep brownout.

How does the manual reset (MR) input function on the MAX6865UK32D6L+T?

The MR input on the MAX6865UK32D6L+T is active-low, internally pulled up to VCC via 10kΩ, and requires a minimum pulse width of 1µs. When asserted, it forces RESET high for the full D6 timeout period after MR returns high. This behavior is documented in the Pin Description, Detailed Description, and Electrical Characteristics sections (tMPW and tMRD parameters).