Analog Devices Inc./Maxim Integrated MAX6414UK30+T

Overview

MAX6414UK30+T from Maxim Integrated is a low-power microprocessor supervisor IC with fixed 3.0V VCC reset threshold, manual reset input (MR), and active-low open-drain RESET output. It monitors supply voltage in battery-powered controllers and embedded systems, asserts reset during brownout or power-up, and uses an external capacitor on SRT to set timeout (2.75ms to 5.75ms). Operating from -40°C to +125°C, it draws only 1.7µA typical quiescent current at 2.0V.

For engineers reviewing the MAX6414UK30+T datasheet, MAX6414UK30+T pinout, MAX6414UK30+T application, or MAX6414UK30+T equivalent, key selection criteria include its 3.0V factory-trimmed threshold accuracy (±2.5% over temperature), guaranteed RESET validity down to VCC = 1V, open-drain output for multi-supply logic interfacing, capacitor-adjustable timeout, and AEC-Q100-qualified automotive variants.

Technical Context

The MAX6414UK30+T implements a precision bandgap-based voltage comparator for VCC monitoring and a high-impedance manual reset input with internal 20kΩ pullup. Its reset assertion logic combines VCC falling below 3.0V ±2.5%, MR low pulse ≥1µs, or both - with deassertion delayed by a 240nA current source charging an external SRT capacitor to 0.65V.

Unlike push-pull variants, the open-drain RESET output allows wired-OR configuration and level-shifting across 0–5.5V supplies. The device guarantees valid reset behavior down to VCC = 1V and provides 75ns MR glitch rejection, making it suitable for noisy automotive and industrial environments where transient immunity is critical.

Key Specifications

Pinout & Package

SOT23-5 package (U5+2A outline, RoHS-compliant, 5-pin surface-mount) with 1.3mm × 2.9mm footprint and 0.95mm height. Thermal resistance θJA = 255.9°C/W on multilayer board.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6414UK30+T, the MAX6414UK30-T lacks RoHS compliance but offers identical performance in Pb-based assemblies, while the TPS3808G30DBVR trades MR capability and open-drain flexibility for lower cost and slightly lower quiescent current - making it suitable only where those features are nonessential.

Availability

MAX6414UK30+T is available at Aetrix Electronics and suitable for automotive engine control units, portable medical monitors, industrial PLC I/O modules, smart energy meters, and battery-powered embedded controllers requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for MAX6414UK30+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 industrial, automotive, and computing applications, with emphasis on power efficiency and reliability.

The MAX6412–MAX6420 family was developed specifically for robust, low-power microprocessor supervision in harsh environments - delivering accurate voltage monitoring, flexible reset timing, and AEC-Q100 qualification for mission-critical automotive and industrial control systems.

FAQ

What is the exact reset threshold voltage of MAX6414UK30+T and how stable is it over temperature?

The MAX6414UK30+T has a factory-trimmed VCC reset threshold of 3.000V with ±1.25% accuracy at +25°C and ±2.5% over the full -40°C to +125°C operating range. This stability is achieved using laser-trimmed resistors and a precision bandgap reference, ensuring consistent brownout detection without external calibration in automotive and industrial applications.

Does MAX6414UK30+T support manual reset, and what are the electrical requirements for the MR pin?

Yes, MAX6414UK30+T includes a dedicated MR (manual reset) input. It is active-low with an internal 20kΩ pullup resistor, accepts logic-low pulses as short as 1µs, rejects glitches under 75ns, and requires no external components. When pulled low, MR asserts RESET for the full timeout period after release - enabling simple momentary switch integration.

How is the reset timeout period set on MAX6414UK30+T, and what capacitor value gives a 4.375ms delay?

The reset timeout period on MAX6414UK30+T is set by connecting a capacitor (CSRT) between the SRT pin and ground. Using the formula tRP = (2.71 × 10⁶) × CSRT + 275µs, a 4.375ms delay requires CSRT = (4.375ms − 0.275ms) / 2.71M ≈ 1500pF. Ceramic capacitors with <10nA leakage are recommended for accuracy.

Can MAX6414UK30+T be used in systems with multiple supply voltages, and how does its open-drain output help?

Yes, MAX6414UK30+T's active-low open-drain RESET output supports multi-rail systems. It can be pulled up to any voltage from 0V to 5.5V - enabling direct interface to 1.8V, 3.3V, or 5V microprocessor reset inputs on the same bus. This eliminates level-shifters and simplifies design in mixed-voltage embedded systems like smart meters and PLCs.

Is MAX6414UK30+T qualified for automotive applications, and what certification does it hold?

MAX6414UK30+T itself is not automotive-qualified, but the /V variant (e.g., MAX6414UK30/V+T) is AEC-Q100 qualified for Grade 0 (-40°C to +150°C junction) and Grade 1 (-40°C to +125°C). These versions undergo rigorous stress testing including HTOL, TC, and ESD - making them suitable for engine control, body electronics, and ADAS modules where automotive reliability is mandatory.