Analog Devices Inc./Maxim Integrated MAX6414UK23+

Overview

MAX6414UK23+ from Maxim Integrated is a low-power, single-voltage microprocessor reset supervisor IC with factory-trimmed 2.313V 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 and recharges through a precise 240nA current source.

For engineers reviewing the MAX6414UK23+ datasheet, MAX6414UK23+ pinout, MAX6414UK23+ application, or MAX6414UK23+ equivalent, key selection criteria include guaranteed reset validity down to VCC = 1V, 1.7µA typical quiescent current at +25°C, ±2.5% VTH accuracy over –40°C to +125°C, and compatibility with logic-level translation via its open-drain output.

Technical Context

The MAX6414UK23+ 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 threshold - enabling programmable delays from 275µs (CSRT = 0F) up to milliseconds.

Unlike push-pull variants, the open-drain RESET output allows wired-OR configuration and interface to higher-voltage logic domains (up to 5.5V) using an external pullup. The device guarantees valid reset assertion even as VCC drops to 1V, with VOL ≤ 0.3V at ISINK = 500µA and ILKG ≤ 1.0µA when reset is not asserted.

Key Specifications

Pinout & Package

SOT23-5 package (5-pin, 2.9mm × 1.6mm, 0.95mm height), RoHS-compliant, tape-and-reel delivery.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6412UK23+, the MAX6414UK23+ trades push-pull simplicity for open-drain interoperability across voltage domains; versus TPS3808G23DBVR, it sacrifices ±0.5% threshold accuracy to gain field-programmable reset duration and logic-level translation - critical for mixed-supply embedded systems.

Availability

MAX6414UK23+ is available at Aetrix Electronics and suitable for battery-powered controllers, automotive body electronics, portable medical sensors, and industrial programmable logic controllers requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MAX6414UK23+ 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, mixed-signal, and power management ICs for demanding industrial, automotive, and medical applications.

The MAX6412–MAX6420 family delivers configurable, ultra-low-power reset supervision for microprocessors in resource-constrained and thermally harsh environments - emphasizing accuracy, flexibility, and long-term reliability over cost-optimized integration.

FAQ

What is the exact factory-trimmed VCC reset threshold voltage for MAX6414UK23+?

The MAX6414UK23+ has a nominal VCC reset threshold of 2.313V, with ±2.5% accuracy over the full –40°C to +125°C operating range. This value is laser-trimmed at wafer test and confirmed in Table 1 of the datasheet under suffix "23". The MAX6414UK23+ uses this fixed threshold to monitor supply rails such as 2.5V or 2.7V systems without external resistors.

How do I calculate the external capacitor value for a specific reset timeout with MAX6414UK23+?

Use the formula CSRT = (tRP – 275µs) / 2.71×10⁶, where tRP is the desired reset timeout in seconds and CSRT is in farads. For example, a 10ms timeout requires CSRT = (0.01 – 0.000275) / 2.71×10⁶ ≈ 3.59nF. The MAX6414UK23+ datasheet specifies ceramic capacitors with leakage <10nA for best accuracy and stability.

Can MAX6414UK23+ interface with a 5V microcontroller while powered from a 3.3V supply?

Yes - the MAX6414UK23+ open-drain RESET output supports this configuration. Connect an external pullup resistor from the RESET pin to the 5V logic rail. When the MAX6414UK23+ asserts reset, it pulls the line low; when deasserted, the 5V pullup drives the signal high. This ensures correct logic levels for the 5V µP without level-shifting circuitry.

Does MAX6414UK23+ guarantee reset assertion when VCC falls below 1V?

No - the MAX6414UK23+ guarantees valid RESET output only down to VCC = 1V. Below 1V, sinking capability degrades and RESET may float. For applications requiring reset validity down to 0V, add a 100kΩ pulldown resistor from RESET to GND. This ensures low state during deep brownout, as documented in the "Ensuring a Valid RESET Down to VCC = 0V" section of the MAX6414UK23+ datasheet.

What is the function of the MR pin on MAX6414UK23+, and does it require an external pullup?

The MR (manual reset) pin on MAX6414UK23+ is an active-low input that forces reset assertion when pulled below 0.3×VCC. It features an internal 20kΩ pullup to VCC, so no external resistor is needed if unused. A normally open momentary switch from MR to GND provides hardware reset capability, with reset held for the full timeout period after release - eliminating need for external debounce circuits.