Analog Devices Inc./Maxim Integrated MAX6414UK31+T

Overview

MAX6414UK31+T from Maxim Integrated is a low-power microprocessor supervisor IC with fixed 3.075V VCC reset threshold, manual reset input (MR), and active-low open-drain RESET output. It monitors supply voltage in systems from 1.6V to 5V, asserts reset during brownout or power-up/down events, and uses an external capacitor on SRT pin to set reset timeout (3.0–5.75ms typical). It is used in automotive ECUs and battery-powered controllers requiring AEC-Q100-compliant supervision.

For engineers reviewing the MAX6414UK31+T datasheet, MAX6414UK31+T pinout, MAX6414UK31+T application, or MAX6414UK31+T equivalent, key selection criteria include its 3.075V factory-trimmed threshold accuracy (±2.5% over –40°C to +125°C), 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 designs.

Technical Context

The MAX6414UK31+T implements a precision bandgap-based voltage comparator for VCC monitoring and a high-impedance MR input with internal 20kΩ pullup. Its reset timeout is generated by a 240nA current source charging an external capacitor on SRT, compared against a 0.65V internal reference - enabling programmable delay from 275µs (no capacitor) up to >5ms.

As an active-low open-drain supervisor, it requires an external pullup resistor for logic-level translation and supports interfacing with µPs operating at voltages up to 5.5V. It guarantees valid RESET assertion even when VCC drops to 1V, and provides power-supply transient immunity - rejecting negative-going VCC glitches ≤50µs at 100mV overdrive.

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 MAX6414UK31+T, the MAX6414UK31-T offers identical functionality in non-RoHS environments, while the TPS3808G33DBVR trades manual reset and programmable timeout for lower quiescent current and higher threshold precision - making it suitable for cost-sensitive, single-threshold applications where design flexibility is secondary to power efficiency.

Availability

MAX6414UK31+T is available at Aetrix Electronics and suitable for automotive engine control units, portable medical monitors, and industrial PLC I/O modules requiring stable component supply with AEC-Q100 qualification and long-term lifecycle support.

Supply support for MAX6414UK31+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 automotive, industrial, and computing applications, with emphasis on power management, sensing, and interface solutions.

The MAX6412–MAX6420 family was designed specifically for reliable, low-power microprocessor supervision in harsh environments - delivering factory-trimmed thresholds, capacitor-programmable timing, and AEC-Q100 qualification in miniature SOT23-5 packages.

FAQ

What is the exact reset threshold voltage of the MAX6414UK31+T?

The MAX6414UK31+T has a nominal VCC reset threshold of 3.075V, with guaranteed tolerance of ±2.5% over the full operating temperature range (–40°C to +125°C). This value is laser-trimmed at wafer test and confirmed in the Electrical Characteristics table under "VCC Reset Threshold Accuracy" - matching the "31" suffix in the part number per Table 1 of the datasheet.

Does the MAX6414UK31+T support manual reset functionality?

Yes, the MAX6414UK31+T includes a dedicated MR (manual reset) input on Pin 3. Pulling MR low asserts the active-low RESET output for the full timeout period, even if VCC remains above threshold. The pin features an internal 20kΩ pullup resistor, allowing it to be left unconnected when not used - no external components required for basic operation.

How is the reset timeout period set on the MAX6414UK31+T?

The reset timeout period on the MAX6414UK31+T is set by connecting an external capacitor (CSRT) between Pin 4 (SRT) and ground. The relationship is tRP = (2.71 × 10⁶) × CSRT + 275µs, where tRP is in seconds and CSRT in farads. For example, a 1500pF capacitor yields 4.375ms typical timeout - verified in the Electrical Characteristics table under "Reset Timeout Period".

What is the purpose of the open-drain RESET output on the MAX6414UK31+T?

The open-drain RESET output on the MAX6414UK31+T enables flexible logic-level interfacing: it can be pulled up to any voltage from 1.8V to 5.5V, allowing direct connection to µPs with differing I/O voltages without level shifters. This architecture supports wired-OR configurations for system-level reset arbitration and simplifies design in mixed-supply systems - a key advantage over push-pull alternatives.

Is the MAX6414UK31+T qualified for automotive applications?

Yes, the MAX6414UK31+T is AEC-Q100 qualified for automotive Grade 0 (–40°C to +125°C), as explicitly stated in the Benefits and Features section and Ordering Information table. The "/V+T" variant (e.g., MAX6414UK31/V+T) denotes full automotive qualification; however, the standard MAX6414UK31+T shares the same die, package, and characterization - and is widely deployed in automotive subsystems including body control modules and ADAS sensors.