Analog Devices Inc./Maxim Integrated MAX6414UK41+

Overview

MAX6414UK41+ from Maxim Integrated is a low-power microprocessor supervisor IC with fixed 4.10V VCC reset threshold, active-low open-drain reset output, manual reset input (MR), and capacitor-adjustable reset timeout. It monitors supply voltage in battery-powered controllers and embedded systems, asserting reset during brownout or power-up until timeout expires after VCC and MR recover. Operating from -40°C to +125°C, it draws only 1.7µA typical at 2.0V.

For engineers reviewing the MAX6414UK41+ datasheet, MAX6414UK41+ pinout, MAX6414UK41+ application, or MAX6414UK41+ equivalent, key selection criteria include its 4.10V ±2.5% threshold accuracy over temperature, guaranteed reset validity down to VCC = 1V, open-drain output compatibility with mixed-voltage µP interfaces, and SOT23-5 footprint for space-constrained designs.

Technical Context

The MAX6414UK41+ 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 set by an external capacitor on the SRT pin, driven by a 240nA current source charging to a 0.65V internal reference.

Reset assertion occurs when VCC falls below 4.10V (±2.5% over -40°C to +125°C) or MR is pulled low; deassertion requires both VCC > 4.10V and MR high for the full timeout period. The open-drain RESET output supports logic-level translation up to 5.5V and sinks ≥50µA at VOL ≤ 0.3V.

Key Specifications

Pinout & Package

SOT23-5 package: 2.9mm × 1.6mm × 1.1mm body, 0.95mm pitch, gull-wing leads. RoHS-compliant lead-free termination (+ suffix).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6414UK41+, MAX6414UK42+ offers higher threshold for improved noise immunity on noisy 4.1V rails, while TPS3808G33DBVR reduces quiescent current by 0.6µA but sacrifices MR functionality and timeout flexibility-making it suitable only for simpler, single-rail applications.

Availability

MAX6414UK41+ is available at Aetrix Electronics and suitable for battery-powered controllers, automotive body electronics, and portable medical sensors requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MAX6414UK41+ 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 industrial, automotive, and computing applications.

The MAX6412–MAX6420 family delivers configurable µP supervision with flexible reset thresholds, manual reset, and capacitor-timed delays-targeting systems needing robust power-on reset and brownout protection in harsh environments.

FAQ

What is the exact reset threshold voltage for MAX6414UK41+ and how does it vary with temperature?

The MAX6414UK41+ has a nominal VCC reset threshold of 4.10V, with ±2.5% tolerance over the full -40°C to +125°C operating range. At +25°C, the threshold is 4.10V ±1.25%. This laser-trimmed accuracy ensures consistent brownout detection across automotive and industrial thermal profiles without external calibration.

How do I calculate the reset timeout period for MAX6414UK41+ using the SRT capacitor?

Use the formula tRP = (2.71 × 10⁶) × CSRT + 275µs, where tRP is in seconds and CSRT is in farads. For example, a 1500pF capacitor yields tRP = 4.375ms (typical). The SRT pin must connect to a low-leakage ceramic capacitor; leakage >10nA will cause timing errors.

Can MAX6414UK41+ interface directly with a 1.8V microcontroller's reset input?

Yes. The MAX6414UK41+'s open-drain RESET output can be pulled up to 1.8V using an external resistor. When asserted, it pulls low to ≤0.3V while sinking ≥50µA-fully compatible with 1.8V CMOS reset inputs. No level shifter is needed.

Does MAX6414UK41+ include a manual reset input, and what are its electrical characteristics?

Yes, MAX6414UK41+ includes a manual reset (MR) input with internal 20kΩ pullup. VIH = 0.7×VCC and VIL = 0.3×VCC ensure compatibility across 1.8V–5.5V supplies. It accepts pulses as short as 1µs and rejects glitches <75ns, enabling robust pushbutton or FPGA-controlled reset initiation.

Is MAX6414UK41+ qualified for automotive applications, and what packaging options are available?

MAX6414UK41+ is offered in lead-free SOT23-5 packaging and is AEC-Q100 qualified when ordered with /V suffix (e.g., MAX6414UK41/V+T). The + suffix denotes RoHS-compliant lead-free termination; standard parts operate from -40°C to +125°C and meet automotive reliability requirements.