Analog Devices Inc./Maxim Integrated MAX6414UK26+

Overview

MAX6414UK26+ from Maxim Integrated is a low-power, single-voltage microprocessor reset supervisor IC with factory-trimmed 2.625V VCC reset threshold, active-low open-drain RESET output, manual reset input (MR), and capacitor-adjustable reset timeout delay. It monitors supply voltage in battery-powered controllers and embedded systems, asserting reset during brownout or power-up until the external SRT capacitor discharges to 0.65V.

For engineers reviewing the MAX6414UK26+ datasheet, MAX6414UK26+ pinout, MAX6414UK26+ application, or MAX6414UK26+ equivalent, key selection criteria include guaranteed reset validity down to VCC = 1V, 1.7µA typical quiescent current, ±2.5% reset threshold accuracy over -40°C to +125°C, and compatibility with logic-level translation via open-drain output.

Technical Context

The MAX6414UK26+ 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 controlled by an internal 240nA current source charging an external capacitor on the SRT pin to a 0.65V ramp threshold.

Reset assertion occurs when VCC falls below 2.625V (±2.5% over temperature) or MR is pulled low; deassertion requires both VCC > 2.625V and MR high for the full timeout period. The open-drain RESET output supports level-shifting to 0–5.5V supplies using an external pullup resistor.

Key Specifications

Pinout & Package

MAX6414UK26+ is housed in a RoHS-compliant, lead-free 5-pin SOT23-5 package (package code U5-2), with 0.95mm pitch and 2.9mm × 1.6mm footprint. Thermal performance supports continuous operation at +125°C ambient.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6414UK26+, MAX6316LUK26+T trades manual reset and capacitor-adjustable timeout for smaller solution size, while TPS3808G125DBVR achieves lower quiescent current but eliminates both user-configurable features-making MAX6414UK26+ the only option supporting field-serviceable reset and application-specific timing.

Availability

MAX6414UK26+ is available at Aetrix Electronics and suitable for automotive body control modules, portable medical devices, industrial PLC expansion cards, and battery-powered wireless sensor nodes requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MAX6414UK26+ 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, emphasizing low power, high reliability, and wide temperature operation.

The MAX6412–MAX6420 family delivers configurable µP reset supervision with capacitor-adjustable timing and multiple reset output types, targeting applications where supply integrity must be guaranteed across harsh environments and diverse voltage rails.

FAQ

What is the exact reset threshold voltage for MAX6414UK26+?

The MAX6414UK26+ has a factory-trimmed nominal VCC reset threshold of 2.625V, with ±2.5% tolerance over the full -40°C to +125°C operating temperature range. This value is confirmed in Table 1 of the datasheet (suffix "26") and verified in the Electrical Characteristics table under VTH parameter conditions.

Does MAX6414UK26+ support manual reset functionality?

Yes, MAX6414UK26+ includes a dedicated MR (manual reset) input (Pin 3) that asserts reset when pulled low. It features an internal 20kΩ pullup resistor, allowing the pin to be left floating if unused. A 1µs minimum pulse width is required for reliable reset initiation, and reset remains asserted for the full capacitor-programmed timeout period after MR is released.

How is the reset timeout period set on MAX6414UK26+?

The reset timeout period on MAX6414UK26+ is set by connecting an external capacitor (CSRT) between Pin 4 (SRT) and ground. The timeout follows tRP = (2.71 × 10⁶) × CSRT + 275µs, where tRP is in seconds and CSRT is in farads. A 1500pF capacitor yields ~4.375ms timeout, as specified in the Electrical Characteristics table.

What is the purpose of the open-drain RESET output on MAX6414UK26+?

The open-drain RESET output (Pin 1) on MAX6414UK26+ enables level-shifting across different logic families. By adding an external pullup resistor to any voltage between 0V and 5.5V, the output can drive 1.8V, 3.3V, or 5V microprocessor reset inputs-providing design flexibility without additional level translators or voltage dividers.

Is MAX6414UK26+ qualified for automotive applications?

MAX6414UK26+ is fully specified from -40°C to +125°C and packaged in RoHS-compliant, lead-free SOT23-5, meeting AEC-Q100 stress test requirements for temperature range and reliability. While not explicitly labeled "automotive grade" in the ordering table (which reserves "/V" suffix for that qualification), its electrical specs, thermal rating, and package construction support under-hood and body-control use cases per industry practice.