Analog Devices Inc./Maxim Integrated MAX6865UK32D1L+T

Overview

The MAX6865UK32D1L+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 10ms minimum reset timeout period. It integrates manual reset input (MR), watchdog timer with 209s typical timeout (L-suffix), and active-low push-pull reset output - designed for reliable power-on reset and brownout protection in battery-critical portable medical and consumer electronics.

For engineers reviewing the MAX6865UK32D1L+T datasheet, MAX6865UK32D1L+T pinout, MAX6865UK32D1L+T application, or MAX6865UK32D1L+T equivalent, key selection criteria include its guaranteed reset validity down to VCC = +1.1V, immunity to short VCC transients (<40µs at 100mV overdrive), watchdog pulse detection capability (≥150ns), and compatibility with CMOS-level MR/WDI inputs.

Technical Context

This device belongs to the MAX6854–MAX6869 family of nanopower µP supervisors. Its core architecture includes a precision voltage monitor with hysteresis (0.5% of VTH), a monostable reset timeout generator, a manual reset latch with 250ns MR-to-reset delay, and a watchdog timer that clears on any WDI edge and expires if WDI remains static beyond 209s (typ).

The MAX6865UK32D1L+T implements active-low push-pull RESET output referenced to VCC, with VOL ≤ 0.3V at ISINK = 1.2mA (VCC ≥ 2.12V) and VOH ≥ 0.8×VCC at ISOURCE = 500µA (VCC ≥ 2.38V). It requires no external components and operates across –40°C to +85°C.

Key Specifications

Pinout & Package

Package: 5-pin SOT23-5, lead-free, surface-mount.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6865UK32D1L+T, MAX6864UK32D1L+T removes CT functionality while preserving all supervision timing and watchdog features, whereas TPS3836K33DBVR trades nanopower operation and watchdog capability for improved threshold accuracy and higher drive strength - making it viable only in non-battery-critical, reset-only designs.

Availability

MAX6865UK32D1L+T is available at Aetrix Electronics and suitable for portable medical devices, battery-powered instrumentation, and low-power wireless sensors requiring stable component supply with guaranteed long-term availability and lead-free compliance.

Supply support for MAX6865UK32D1L+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 product line was engineered specifically for ultra-low-power microprocessor supervision in space- and energy-constrained portable systems, emphasizing nanoscale current consumption, wide VCC range, and integrated watchdog safety.

FAQ

What is the exact reset threshold voltage of the MAX6865UK32D1L+T?

The MAX6865UK32D1L+T has a factory-trimmed reset threshold voltage of 3.2V with ±2.5% tolerance over temperature (–40°C to +85°C), corresponding to suffix "32" per the Threshold Suffix Guide. This value is guaranteed across the full operating range and ensures accurate brownout detection on 3.3V rails.

Does the MAX6865UK32D1L+T include a watchdog timer, and what is its timeout?

Yes, the MAX6865UK32D1L+T includes a watchdog timer with a typical timeout of 209s, indicated by the "L" suffix in the part number. The timer resets on any rising or falling edge at the WDI pin and expires only if WDI remains static beyond this period - enabling robust detection of firmware hangs in long-cycle applications.

What type of reset output does the MAX6865UK32D1L+T provide?

The MAX6865UK32D1L+T provides an active-low push-pull reset output (pin 1). It drives low with VOL ≤ 0.3V at 1.2mA sink current (VCC ≥ 2.12V) and high with VOH ≥ 0.8×VCC at 500µA source current (VCC ≥ 2.38V), eliminating the need for an external pullup resistor.

Can the MAX6865UK32D1L+T operate reliably at very low supply voltages?

Yes, the MAX6865UK32D1L+T guarantees valid reset output functionality down to VCC = +1.1V, and its supply current remains ultra-low (170nA typ) even at VCC = 1.8V. This enables dependable supervision during deep brownout conditions common in aging battery-powered systems.

Is the MAX6865UK32D1L+T pin-compatible with other devices in the MAX68xx family?

The MAX6865UK32D1L+T uses the standard 5-pin SOT23-5 footprint shared across the MAX6854–MAX6869 family. It is pin-compatible with MAX6864UK32D1L+T and MAX6866UK32D1L+T, differing only in reset output polarity and open-drain option - ensuring layout reuse across variants with identical pin assignments.