Analog Devices Inc./Maxim Integrated MAX6414UK31/V+T

Overview

MAX6414UK31/V+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 automotive-grade systems, asserts reset during brownout or power-up, and uses an external capacitor on SRT to set timeout (3.0–5.75ms typical). Designed for critical μP monitoring in harsh environments.

For engineers reviewing the MAX6414UK31/V+T datasheet, MAX6414UK31/V+T pinout, MAX6414UK31/V+T application, or MAX6414UK31/V+T equivalent, key selection criteria include AEC-Q100 qualification, guaranteed reset validity down to VCC = 1V, 1.7μA typical quiescent current, open-drain logic compatibility with multiple supply rails, and capacitor-adjustable timeout timing.

Technical Context

The MAX6414UK31/V+T implements a precision bandgap-based voltage comparator for VCC monitoring with ±2.5% threshold accuracy over –40°C to +125°C, paired with a 240nA constant-current ramp generator on the SRT pin to control reset timeout via external capacitor discharge/charge timing. Its MR input features internal 20kΩ pullup and 1µs minimum pulse width support.

As an active-low open-drain supervisor, it requires an external pullup resistor for logic-level translation-enabling interface with μPs operating at 3.3V, 5V, or other supplies up to 5.5V-while maintaining immunity to short-duration VCC transients (e.g., ≤50µs for 100mV overdrive).

Key Specifications

Pinout & Package

SOT23-5 package (U5+2A outline), 5-pin surface-mount, RoHS-compliant lead-free (+T) with automotive qualification (/V).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6414UK31+T, the /V+T version adds automotive qualification and extended high-temp operation, while TLV803EB30DBZR trades MR functionality and timeout adjustability for reduced size and BOM count-making each viable only where its specific trade-offs align with system requirements.

Availability

MAX6414UK31/V+T is available at Aetrix Electronics and suitable for automotive ECUs, medical infusion pumps, industrial PLC modules, and ADAS camera power sequencers requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MAX6414UK31/V+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 family delivers low-power, capacitor-timed microprocessor supervision with flexible reset configurations-including fixed, adjustable, and dual-rail monitoring-for mission-critical power-management systems.

FAQ

What is the exact reset threshold voltage for MAX6414UK31/V+T?

The MAX6414UK31/V+T has a factory-trimmed VCC reset threshold of 3.075V nominal, with ±2.5% tolerance over –40°C to +125°C. This value is confirmed by the "31" suffix in the part number per Maxim's Reset Voltages Suffix Table, and is guaranteed by laser-trimmed internal resistors. The MAX6414UK31/V+T maintains this accuracy without external components.

Does MAX6414UK31/V+T support manual reset functionality?

Yes, the MAX6414UK31/V+T includes a dedicated MR (manual reset) input on Pin 3. Asserting MR low triggers reset regardless of VCC level, and the reset remains active for the full timeout period after MR is released. An internal 20kΩ pullup resistor allows MR to be left unconnected if unused, and the pin accepts pulses as short as 1µs.

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

The reset timeout period on MAX6414UK31/V+T is set by connecting an external capacitor (CSRT) between Pin 4 (SRT) and GND. Using CSRT = 1500pF yields a typical timeout of 4.375ms. The relationship is tRP = (2.71 × 10⁶) × CSRT + 275µs, where tRP is in seconds and CSRT in farads. Ceramic capacitors with <10nA leakage are recommended.

Is MAX6414UK31/V+T compatible with 1.8V or 5V microcontrollers?

Yes, the MAX6414UK31/V+T features an active-low open-drain RESET output (Pin 1), which requires an external pullup resistor to the target μP's supply rail (e.g., 1.8V or 5V). This allows direct logic-level compatibility across mixed-voltage systems without level shifters-confirmed in Maxim's Figure 5 and Electrical Characteristics table for VOH and VOL.

What does the "/V+T" suffix indicate in MAX6414UK31/V+T?

The "/V" denotes AEC-Q100 qualification for automotive applications (Grade 0, –40°C to +125°C), while "+T" specifies lead-free, tape-and-reel packaging. Together, "/V+T" confirms that MAX6414UK31/V+T meets automotive reliability standards and environmental compliance requirements-distinct from commercial versions like MAX6414UK31+T.