Analog Devices Inc./Maxim Integrated MAX6414UK22

Overview

MAX6414UK22 from Maxim Integrated is a low-power microprocessor supervisor IC with fixed 2.188V 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 from 275µs to >5ms. Operating from 1.0V to 5.5V, it guarantees valid reset down to VCC = 1V and draws only 1.7µA typical at VCC ≤ 2.0V.

For engineers reviewing the MAX6414UK22 datasheet, MAX6414UK22 pinout, MAX6414UK22 application, or MAX6414UK22 equivalent, this page delivers verified circuit role (single-voltage µP reset supervisor), exact threshold (2.188V ±2.5%), open-drain drive capability (3.2mA sink at 4.5V), capacitor-adjustable timeout, and AEC-Q100-qualified automotive variants - all confirmed from Maxim's official datasheet Rev 8 (2018).

Technical Context

The MAX6414UK22 implements a precision bandgap-based voltage comparator for VCC monitoring with factory-trimmed 2.188V threshold (±2.5% over –40°C to +125°C) and 4×VTH hysteresis. Its reset assertion logic responds to VCC falling below threshold, MR pin pulled low, or both - with reset deassertion delayed by a capacitor-controlled ramp (240nA current source charging CSRT to 0.65V reference).

As an open-drain supervisor, MAX6414UK22 supports level-shifting across logic domains: RESET can be pulled up to any voltage from 0V to 5.5V, enabling direct interface with 1.8V, 3.3V, or 5V microprocessors without level translators. Its 1.7µA quiescent current and guaranteed operation down to VCC = 1V make it suitable for ultra-low-power wake-up and brownout detection in portable and automotive applications.

Key Specifications

Pinout & Package

SOT23-5 package (5-pin, 2.9mm × 1.6mm, 0.95mm height), RoHS-compliant, tape-and-reel delivery. Pin 1 marked with dot; top-side marking includes "UK22" and date code.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6414UK22, MAX6316LUK23D3+T offers simpler push-pull drive but sacrifices manual reset and timeout flexibility, while TPS3808G18DBVR provides resistor-programmable timing and MR but mismatches the 2.188V threshold and requires board rework - making MAX6414UK22 uniquely suited for 2.2V-system brownout protection with field-adjustable reset hold time.

Availability

MAX6414UK22 is available at Aetrix Electronics and suitable for battery-powered portable instrumentation, automotive body control modules, and industrial PLC I/O modules requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MAX6414UK22 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 computing applications, with emphasis on power efficiency and reliability.

The MAX6412–MAX6420 product line delivers low-power, capacitor-programmable microprocessor supervisors targeting fail-safe power monitoring in automotive ECUs, portable medical devices, and energy infrastructure where deterministic reset timing and ultra-low standby current are critical.

FAQ

What is the exact reset threshold voltage of MAX6414UK22 and how is it trimmed?

The MAX6414UK22 has a factory-laser-trimmed VCC reset threshold of 2.188V (typical), with ±2.5% tolerance over –40°C to +125°C. This value is derived from the "22" suffix per Maxim's Reset Voltages Suffix Table (Table 1, datasheet p.8), where "22" maps to MIN=2.133V, TYP=2.188V, MAX=2.243V. The trimming is performed at wafer test using laser adjustment of on-chip resistors, ensuring accuracy without external components. MAX6414UK22 achieves this specification in its standard SOT23-5 package.

Does MAX6414UK22 support manual reset, and how is it implemented?

Yes, MAX6414UK22 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. An internal 20kΩ pullup resistor allows MR to be left unconnected when unused. For implementation, a normally open momentary switch between MR and GND provides hardware reset without debounce circuitry - validated in the datasheet's Manual Reset Input section (p.5). This feature is integral to MAX6414UK22's design and functions identically across all temperature ranges.

How do I calculate the capacitor value for a specific reset timeout on MAX6414UK22?

Use the formula CSRT = (tRP – 275µs) / 2.71×10⁶, where tRP is the desired timeout in seconds and CSRT is in farads. For example, a 4.375ms timeout requires CSRT = (0.004375 – 0.000275) / 2.71×10⁶ = 1513pF - matching the typical value in the Electrical Characteristics table. The SRT pin sources a precise 240nA current; CSRT must be low-leakage (<10nA), with X7R or C0G ceramic recommended. This calculation is explicitly defined for MAX6414UK22 in the datasheet's Application Information section (p.6).

Can MAX6414UK22 monitor voltages other than VCC?

No - MAX6414UK22 is a single-threshold, VCC-only supervisor. Unlike MAX6415–MAX6420 variants, it lacks a RESET IN pin for external voltage monitoring. Its pinout (RESET, GND, MR, SRT, VCC) confirms no dedicated adjustable input. The datasheet Selector Guide (p.11) explicitly assigns MAX6414 to "Fixed VTH / Manual Reset / - / - / Open-Drain RESET", confirming VCC-only supervision. For dual-voltage monitoring, MAX6420UK22-T would be required instead of MAX6414UK22.

Is MAX6414UK22 qualified for automotive use, and what does the /V suffix indicate?

The base MAX6414UK22-T is not automotive-qualified; only variants with "/V" in the part number (e.g., MAX6414UK22/V+T) are AEC-Q100 Grade 1 qualified (–40°C to +125°C). The datasheet Ordering Information (p.10) lists MAX6414UK22/V+T as available, with "/V" denoting automotive qualification and "+" indicating lead-free packaging. Standard MAX6414UK22-T meets industrial specs but lacks AEC-Q100 validation - critical for under-hood applications. Always verify the full orderable part number for automotive compliance.