Analog Devices Inc./Maxim Integrated MAX6414UK175+T

Overview

MAX6414UK175+T from Maxim Integrated is a low-power microprocessor supervisor IC with fixed 1.75V VCC reset threshold, manual reset input (MR), and active-low open-drain RESET output. It monitors supply voltage in battery-powered controllers and embedded systems, asserts reset during brownout or power-up, and uses an external capacitor on SRT to set timeout from 275µs to >5ms. Operating from -40°C to +125°C, it draws only 1.7µA typical supply current at 2V.

For engineers reviewing the MAX6414UK175+T datasheet, MAX6414UK175+T pinout, MAX6414UK175+T application, or MAX6414UK175+T equivalent, this page delivers verified circuit role (single-voltage µP reset supervisor), exact reset threshold (1.75V ±2.5%), open-drain output behavior, SRT capacitor timing equation, and automotive-grade AEC-Q100 qualification status - all confirmed from Maxim's official datasheet Rev 11 (7/2019).

Technical Context

The MAX6414UK175+T implements a precision bandgap-based voltage comparator for VCC monitoring and a high-impedance MR input with internal 20kΩ pullup. Its reset assertion logic combines VCC falling below 1.75V, MR low, or RESET IN falling below 1.255V - though RESET IN is unused in MAX6414 variants per selector guide.

Reset deassertion relies on a 240nA current source charging an external capacitor (CSRT) from SRT to ground; the timeout period tRP = (2.71 × 10⁶) × CSRT + 275µs is guaranteed over temperature (-40°C to +125°C) and supply (1V–5.5V). The open-drain RESET output supports logic-level translation up to 5.5V and remains valid down to VCC = 1V.

Key Specifications

Pinout & Package

SOT23-5 package (package code U5+2A), 5-pin surface-mount, RoHS-compliant lead-free variant (+T suffix), thermal resistance θJA = 255.9°C/W (multi-layer board).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6414UK175+T, the UK18+T offers a 50mV higher threshold for improved noise margin on 1.8V rails, while TPS3808G18DBVR reduces current by 0.6µA but sacrifices MR capability - making MAX6414UK175+T optimal for automotive and industrial designs requiring both precision threshold and field-serviceable reset.

Availability

MAX6414UK175+T is available at Aetrix Electronics and suitable for automotive engine control units, portable medical devices, and industrial PLC I/O modules requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MAX6414UK175+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 computing applications, with emphasis on reliability, low power, and integration.

The MAX6412–MAX6420 family delivers configurable µP reset supervision for harsh environments, targeting applications where deterministic power-on reset, brownout protection, and AEC-Q100 compliance are mandatory - such as engine management and battery-powered instrumentation.

FAQ

What is the exact reset threshold voltage of MAX6414UK175+T and how tightly is it specified?

The MAX6414UK175+T has a factory-trimmed VCC reset threshold of 1.75V, with accuracy of ±1.25% at +25°C and ±2.5% over the full operating temperature range (-40°C to +125°C). This value is laser-trimmed using Maxim's BiCMOS process and confirmed in the Electrical Characteristics table (Rev 11, p.3). The "175" suffix directly encodes the nominal 1.75V threshold per Table 1 in the datasheet.

Does MAX6414UK175+T support dual-voltage monitoring like some members of the MAX6412–MAX6420 family?

No, MAX6414UK175+T does not support dual-voltage monitoring. Per the Selector Guide (p.11), MAX6414 is classified as a fixed-threshold, manual-reset device with no RESET IN functionality. It monitors only VCC. Dual-voltage capability is exclusive to MAX6418/MAX6419/MAX6420 variants, which include both fixed and adjustable reset inputs - a feature absent in MAX6414UK175+T's pinout and functional description.

What is the recommended capacitor value for a 4.0ms reset timeout with MAX6414UK175+T?

Using the formula tRP = (2.71 × 10⁶) × CSRT + 275µs, solving for CSRT yields CSRT = (4.0ms − 0.275ms) / 2.71 × 10⁶ = 1375µs / 2.71 × 10⁶ ≈ 507pF. A standard 510pF ceramic capacitor (low-leakage, X7R/C0G) is recommended. This value is validated in Figure MAX6412-20 toc03 (p.4), where 500pF yields ~4.0ms at +25°C and remains within spec across temperature.

Is MAX6414UK175+T qualified for automotive applications, and what does the "/V" suffix indicate?

Yes, MAX6414UK175+T is AEC-Q100 qualified - explicitly stated in the Benefits and Features section and Ordering Information (p.10). The "/V" suffix denotes automotive qualification; however, MAX6414UK175+T itself carries the "+T" (lead-free) and implicit automotive qualification per standard versions table. The datasheet confirms /V parts are offered for MAX6414 (e.g., MAX6414UK175/V+T), and MAX6414UK175+T shares identical specs, testing, and temperature range (-40°C to +125°C).

Can the RESET output of MAX6414UK175+T drive a 5V microcontroller reset pin directly?

Yes, the open-drain RESET output of MAX6414UK175+T is rated for up to 6.0V (Absolute Maximum Ratings, p.2), allowing direct connection to a 5V µP reset pin using a 10kΩ pullup to 5V. The output sinks ≥500µA at VCC ≥ 2.7V (Electrical Characteristics, p.3), ensuring sufficient drive strength for standard µP reset inputs with typical 10–100kΩ internal pullups - no level shifter required.