Analog Devices Inc./Maxim Integrated MAX6414UK29/V+T

Overview

MAX6414UK29/V+T from Maxim Integrated is a low-power microprocessor supervisor IC with fixed 2.925V 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 battery-powered controllers and intelligent instruments.

For engineers reviewing the MAX6414UK29/V+T datasheet, MAX6414UK29/V+T pinout, MAX6414UK29/V+T application, or MAX6414UK29/V+T equivalent, key selection criteria include its AEC-Q100 qualification, guaranteed reset validity down to VCC = 1V, capacitor-adjustable timeout, 1.7μA typical quiescent current, and compatibility with dual-supply logic interfaces via open-drain output.

Technical Context

The MAX6414UK29/V+T implements a precision bandgap-based voltage comparator for VCC monitoring at 2.925V ±2.5% over –40°C to +125°C, paired with a high-impedance manual reset input (MR) featuring internal 20kΩ pullup. Its reset assertion logic combines VCC undervoltage detection and MR low-level assertion, 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 supports flexible logic-level interfacing-compatible with 0–5.5V pullup supplies-and enables wired-OR configurations. The device guarantees valid reset signaling for VCC ≥ 1V and exhibits immunity to transients ≤50μs when VCC dips 100mV below threshold.

Key Specifications

Pinout & Package

SOT23-5 package (U5+2A outline, RoHS-compliant, 5-pin surface-mount).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6414UK29/V+T, MAX6414UK29+T omits automotive qualification and thermal range, while TPS3808G33DBVR lacks MR input and capacitor-adjustable timeout-making MAX6414UK29/V+T uniquely suited for AEC-Q100 systems requiring field-serviceable reset and tunable delay.

Availability

MAX6414UK29/V+T is available at Aetrix Electronics and suitable for automotive engine control units, portable medical equipment, and industrial PLC modules requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MAX6414UK29/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 ultra-low-power, capacitor-tunable microprocessor supervisors targeting safety-critical embedded systems where supply monitoring, reset timing flexibility, and AEC-Q100 compliance are essential.

FAQ

What is the exact reset threshold voltage of MAX6414UK29/V+T?

The MAX6414UK29/V+T has a factory-trimmed VCC reset threshold of 2.925V, with tolerance of ±2.5% over –40°C to +125°C. This value corresponds to the "29" suffix per Maxim's Reset Voltages Suffix Table and is laser-trimmed during production for accuracy without external calibration.

Does MAX6414UK29/V+T support manual reset functionality?

Yes, MAX6414UK29/V+T includes a dedicated MR (manual reset) input on Pin 3. It is active-low, features an internal 20kΩ pullup resistor, and accepts logic-low pulses ≥1μs to assert reset. The MR signal extends the reset timeout period identically to VCC undervoltage events.

How is the reset timeout period set on MAX6414UK29/V+T?

The reset timeout period on MAX6414UK29/V+T is set by connecting an external capacitor (CSRT) between Pin 4 (SRT) and ground. 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.

Can MAX6414UK29/V+T monitor voltages other than VCC?

No-MAX6414UK29/V+T is a single-threshold, VCC-only supervisor with fixed 2.925V detection. It does not include a RESET IN pin for external voltage monitoring. For dual-voltage or adjustable-threshold capability, consider MAX6420UK29/V+T, which adds an adjustable RESET IN input alongside the same 2.925V VCC threshold.

Is MAX6414UK29/V+T compatible with 1.8V microcontrollers?

Yes-MAX6414UK29/V+T's open-drain RESET output supports logic-level interfacing with 1.8V systems. Connect the RESET pin to a 1.8V pullup; the device sinks ≤0.3V at 50µA load, ensuring solid logic-low assertion compatible with 1.8V μP reset inputs.