Analog Devices Inc./Maxim Integrated MAX6414UK44+T

Overview

MAX6414UK44+T from Maxim Integrated is a low-power microprocessor supervisor IC with fixed 4.375V VCC reset threshold, manual reset input (MR), and active-low open-drain RESET output. It monitors system supply voltage, asserts reset during brownout or power-up, and provides capacitor-adjustable timeout (3.0–5.75ms with 1500pF). Designed for automotive-grade applications requiring AEC-Q100 compliance and operation from -40°C to +125°C.

For engineers reviewing the MAX6414UK44+T datasheet, MAX6414UK44+T pinout, MAX6414UK44+T application, or MAX6414UK44+T equivalent, key selection criteria include its 4.375V ±2.5% threshold accuracy over temperature, 1.7µA typical quiescent current at 2V, guaranteed RESET validity down to VCC = 1V, open-drain output compatibility with mixed-voltage µP interfaces, and SOT23-5 package suitability for space-constrained embedded systems.

Technical Context

The MAX6414UK44+T implements a precision bandgap-based voltage comparator for VCC monitoring and a high-impedance manual reset input with internal 20kΩ pullup. Its reset timeout is generated by a 240nA current source charging an external capacitor on the SRT pin, referenced to a 0.65V internal threshold.

Unlike push-pull variants, the open-drain RESET output allows wired-OR configuration and level-shifting across logic domains (0–5.5V), while the fixed 4.375V threshold-factory-laser-trimmed per suffix "44"-ensures stable trip point without external resistor networks.

Key Specifications

Pinout & Package

SOT23-5 package (5-pin, 2.9mm × 1.6mm × 1.1mm), RoHS-compliant, lead-free (+T suffix), thermal resistance θJA = 255.9°C/W (multi-layer board).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6414UK44+T, the MAX6414UK44-T offers identical functionality without RoHS compliance, while the TPS3808G33DBVR trades threshold voltage, output type, and configurability for slightly lower quiescent current-making it unsuitable for 4.5V brownout detection or systems requiring manual reset or timeout adjustment.

Availability

MAX6414UK44+T is available at Aetrix Electronics and suitable for automotive ECUs, medical infusion pumps, industrial PLC modules, and portable diagnostic handhelds requiring stable component supply, AEC-Q100 qualification, and extended temperature operation.

Supply support for MAX6414UK44+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, automotive, and medical applications.

The MAX6412–MAX6420 product line delivers ultra-low-power, capacitor-programmable microprocessor supervisors targeting safety-critical power monitoring in harsh environments.

FAQ

What is the exact reset threshold voltage of the MAX6414UK44+T?

The MAX6414UK44+T has a factory-laser-trimmed VCC reset threshold of 4.375V, with ±1.25% accuracy at +25°C and ±2.5% over the full operating temperature range (-40°C to +125°C), as specified in the Electrical Characteristics table. This value corresponds directly to the "44" suffix in the part number per the Reset Voltages Suffix Table.

Does the MAX6414UK44+T support manual reset functionality?

Yes, the MAX6414UK44+T includes a dedicated MR (manual reset) pin (Pin 3) that accepts an active-low signal to assert reset. It features an internal 20kΩ pullup resistor, allowing direct connection of a momentary switch to ground. Reset remains asserted for the full timeout period after MR is released, matching the behavior of the VCC- and RESET IN–triggered reset events.

What is the maximum recommended capacitor value for the SRT pin on the MAX6414UK44+T?

The MAX6414UK44+T datasheet specifies a maximum reset timeout period of 5.75ms with a 1500pF capacitor on the SRT pin. While larger capacitors extend timeout, leakage current becomes critical above ~2nF. For reliable operation, ceramic capacitors ≤1500pF with leakage <10nA are recommended; values beyond this risk timing inaccuracy due to parasitic discharge paths.

Can the MAX6414UK44+T operate with a supply voltage below 1.8V?

Yes, the MAX6414UK44+T operates from VCC = 1.0V to 5.5V. At VCC ≥ 1.0V, the RESET output is guaranteed valid (VOL ≤ 0.3V at ISINK = 50µA). Below 1.0V, output drive capability degrades; however, the device continues asserting reset until VCC rises above 4.375V, ensuring robust brownout protection even during deep undervoltage conditions.

Is the MAX6414UK44+T pin-compatible with other devices in the MAX6412–MAX6420 family?

Yes, all MAX6412–MAX6420 variants-including the MAX6414UK44+T-use the identical SOT23-5 package with standardized pinout (RESET, GND, MR, SRT, VCC). This allows drop-in replacement across the family when selecting different thresholds, reset types, or monitoring configurations, provided the application's functional requirements (e.g., open-drain vs. push-pull) are met.