Analog Devices Inc./Maxim Integrated MAX6865UK30D4L+T

Overview

The MAX6865UK30D4L+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 3.000V reset threshold (suffix "30"), 1200ms minimum reset timeout (suffix "D4"), and watchdog timer with 209s typical timeout (suffix "L"). It monitors VCC, responds to manual reset (MR), and triggers reset on watchdog expiration - designed for battery-critical applications like glucose monitors and portable medical devices.

For engineers reviewing the MAX6865UK30D4L+T datasheet, MAX6865UK30D4L+T pinout, MAX6865UK30D4L+T application, or MAX6865UK30D4L+T equivalent, this page delivers verified specifications, validated pin functions, confirmed reset timing behavior, and real-world substitution guidance - all grounded in Maxim's official documentation and electrical characteristics tables.

Technical Context

The MAX6865UK30D4L+T implements a dual-trigger reset architecture: it asserts reset when VCC falls below 3.000V (±2.5%), MR is pulled low, or the watchdog input (WDI) remains static beyond 209s (typ). Its internal watchdog timer clears on any WDI edge, MR assertion, or active reset - enabling robust software execution monitoring in safety-critical firmware.

Reset output is push-pull active-high (per Selector Guide and MAX6865 pin description), guaranteed valid down to VCC = 1.1V, with VOL ≤ 0.3V at ISINK = 1.2mA and VOH ≥ 0.8×VCC at ISOURCE = 500µA. The device requires no external components and features 200ns MR glitch rejection and 250ns MR-to-reset delay.

Key Specifications

Pinout & Package

Package: 5-pin SOT23-5, lead-free (indicated by "+T" suffix), 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 MAX6864UK30D4L+T, the MAX6865UK30D4L+T avoids level-shifting circuitry but requires µP compatibility with active-high reset. Versus TPS3836K33DBVR, it adds critical watchdog supervision and extended 1200ms timeout - essential for complex embedded firmware recovery.

Availability

MAX6865UK30D4L+T is available at Aetrix Electronics and suitable for glucose monitors, patient monitoring devices, smart wearables, and industrial handheld terminals requiring stable component supply across extended production lifecycles.

Supply support for MAX6865UK30D4L+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, mixed-signal, and power management ICs for demanding industrial, medical, and communications applications.

The MAX6865UK30D4L+T belongs to Maxim's nanopower µP supervisory family, engineered specifically for ultra-low-power, safety-critical embedded systems where battery longevity and deterministic reset behavior are non-negotiable.

FAQ

What is the exact reset threshold voltage of the MAX6865UK30D4L+T?

The MAX6865UK30D4L+T has a factory-trimmed reset threshold of 3.000V ±2.5%, as indicated by the "30" suffix in its part number per Maxim's Threshold Suffix Guide (Table 2). This value is guaranteed over -40°C to +85°C and applies to VCC falling conditions. The device asserts reset when VCC drops below this threshold and holds reset for the full 1200ms timeout after VCC rises above it.

Does the MAX6865UK30D4L+T support active-high or active-low reset output?

The MAX6865UK30D4L+T features an active-high push-pull RESET output, confirmed by the Selector Guide (row MAX6865) and MAX6865-specific pin description. When reset is asserted, RESET pin drives high; when deasserted, it drives low. This eliminates need for external pullup resistors and simplifies interface with µPs requiring active-high reset inputs.

What is the watchdog timeout period for the MAX6865UK30D4L+T?

The MAX6865UK30D4L+T provides a watchdog timeout period of 209s typical (95s min, 487s max), denoted by the "L" suffix per Table 3. The watchdog timer clears on any rising or falling edge at WDI and expires only if WDI remains static beyond this interval - making it ideal for long-duration firmware tasks like sensor calibration or wireless handshake sequences.

Can the MAX6865UK30D4L+T operate with supply voltages below 3.0V?

Yes, the MAX6865UK30D4L+T operates from VCC = 1.2V to 5.5V and guarantees valid reset assertion down to VCC = 1.1V. Its 3.000V reset threshold remains accurate across this range, and supply current stays at 170nA typical even at 1.8V. This allows reliable brownout detection in partially depleted battery scenarios common in medical wearables.

Is the MAX6865UK30D4L+T pin-compatible with other devices in the MAX68xx family?

The MAX6865UK30D4L+T uses the standard 5-pin SOT23-5 package and shares identical pinout with MAX6864/MAX6866 (per MAX6864/MAX6865/MAX6866 Pin Description), differing only in RESET polarity. It is not pin-compatible with MAX6861–MAX6863 (which include CT pin) or MAX6854–MAX6856 (which lack WDI). Direct replacement requires matching RESET polarity and WDI requirement.