Analog Devices Inc./Maxim Integrated MAX6414UK46+

Overview

MAX6414UK46+ from Maxim Integrated is a low-power, single-voltage microprocessor reset supervisor IC with factory-trimmed 4.625V 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, ensuring reliable µP initialization under 1.0V to 5.5V VCC operation.

For engineers reviewing the MAX6414UK46+ datasheet, MAX6414UK46+ pinout, MAX6414UK46+ application, or MAX6414UK46+ equivalent, key selection criteria include its guaranteed reset validity down to VCC = 1V, 1.7µA typical quiescent current, SOT23-5 package compatibility, and open-drain output enabling level-shifting across multiple logic domains.

Technical Context

The MAX6414UK46+ implements a precision bandgap-based voltage comparator for VCC monitoring with ±1.25% threshold accuracy at +25°C and ±2.5% over –40°C to +125°C. Its internal 240nA current source charges an external capacitor on the SRT pin to generate a programmable reset timeout period ranging from 275µs (CSRT = 0) up to milliseconds (e.g., 4.375ms at CSRT = 1500pF).

Reset assertion occurs when VCC falls below 4.625V or MR is pulled low; deassertion requires both VCC > 4.625V and MR high for the full timeout duration. The open-drain RESET output supports pull-up to any voltage ≤ 6.0V, enabling interoperability with 3.3V, 5V, or mixed-supply µPs without level translators.

Key Specifications

Pinout & Package

SOT23-5 package: ultra-compact 2.9mm × 1.6mm surface-mount outline with 0.95mm pitch, optimized for space-constrained portable and automotive PCBs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS3808G33DBVR and ADM6315-46ARTZ-RL, the MAX6414UK46+ uniquely combines 4.625V precision threshold, manual reset capability, capacitor-programmable timeout, and ultra-low 1.7µA supply current in a single SOT23-5 package-making it optimal for battery-sensitive, dual-trigger (VCC + MR) reset applications requiring exact voltage trip points.

Availability

MAX6414UK46+ is available at Aetrix Electronics and suitable for automotive body control modules, portable medical monitors, industrial PLC I/O modules, battery-powered data loggers, and critical microprocessor monitoring applications requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MAX6414UK46+ 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 power, sensing, and interface applications in industrial, automotive, and medical markets.

The MAX6412–MAX6420 product line delivers ultra-low-power, capacitor-configurable reset supervisors targeting battery-operated and thermally demanding systems where deterministic power-on reset timing and minimal supply current are essential.

FAQ

What is the exact factory-trimmed reset threshold voltage for MAX6414UK46+?

The MAX6414UK46+ has a factory-trimmed VCC reset threshold of 4.625V, with ±1.25% accuracy at +25°C and ±2.5% over the full –40°C to +125°C operating range. This value corresponds to the "46" suffix in the part number per Table 1 of the datasheet, and is laser-trimmed during production to ensure tight tolerance without external components.

Can MAX6414UK46+ monitor voltages other than VCC?

No, the MAX6414UK46+ is configured exclusively for single-voltage VCC monitoring with a fixed 4.625V threshold. Unlike the MAX6415–MAX6420 variants, it lacks a RESET IN pin and adjustable threshold capability. To monitor auxiliary rails such as 3.3V or 1.8V, use MAX6415UK-T (adjustable) or MAX6418UK46-T (dual-threshold) instead of MAX6414UK46+.

How do I calculate the SRT capacitor value for a desired reset timeout period with MAX6414UK46+?

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 5ms timeout requires CSRT = (0.005 – 0.000275) / 2.71×10⁶ ≈ 1.74nF. Select a low-leakage ceramic capacitor (≤10nA) and keep the SRT trace short and isolated from noise sources to maintain timing accuracy in MAX6414UK46+.

Does MAX6414UK46+ support operation below 1.0V VCC?

The MAX6414UK46+ guarantees valid RESET output only down to VCC = 1.0V. Below this, output drive strength collapses and logic state becomes indeterminate. For applications requiring reset assertion down to 0V, add a 100kΩ pulldown resistor from RESET to GND - but note that open-drain topology makes MAX6414UK46+ unsuitable for true 0V-valid operation; consider MAX6412/MAX6413 variants with push-pull outputs if VCC < 1V behavior is critical.

Is MAX6414UK46+ pin-compatible with other devices in the MAX6412–MAX6420 family?

Yes, all MAX6412–MAX6420 devices share identical SOT23-5 pinout and footprint, including MAX6414UK46+. Pin 1 is RESET, Pin 2 is GND, Pin 3 is MR, Pin 4 is SRT, and Pin 5 is VCC. However, functional differences exist: MAX6414UK46+ has open-drain RESET, while MAX6412UK46+ offers push-pull active-low and MAX6413UK46+ push-pull active-high - verify output type and threshold before substitution.