Analog Devices Inc./Maxim Integrated MAX6414UK46

Overview

The MAX6414UK46 from Maxim Integrated is a low-power microprocessor supervisor IC with fixed 4.625V VCC reset threshold, manual reset input (MR), and active-low open-drain RESET output. It monitors system supply voltage, asserts reset during brownout or power-up/down events, and uses an external capacitor on SRT to set timeout (3.0–5.75ms typical). It operates from -40°C to +125°C in automotive and industrial embedded controllers.

For engineers reviewing the MAX6414UK46 datasheet, MAX6414UK46 pinout, MAX6414UK46 application, or MAX6414UK46 equivalent, key selection criteria include its 4.625V ±2.5% threshold accuracy over temperature, 1.7µA typical quiescent current at 2V, guaranteed RESET validity down to VCC = 1V, and compatibility with dual-supply logic interfacing via open-drain output.

Technical Context

The MAX6414UK46 implements a precision bandgap-based voltage comparator for VCC monitoring with factory-trimmed 4.625V threshold (±2.5% over -40°C to +125°C) and 4×VTH hysteresis. Its reset timeout is generated by a 240nA internal current source charging an external capacitor on SRT, with deassertion triggered when the ramp reaches 0.65V.

It features a high-impedance MR input with 20kΩ internal pullup, enabling momentary switch reset without external debounce. The open-drain RESET output supports logic-level translation across supplies up to 5.5V and sinks ≥50µA at VOL ≤ 0.3V (VCC ≥ 1.0V).

Key Specifications

Pinout & Package

Package: SOT23-5, 5-pin surface-mount package with 1.6mm × 2.9mm footprint and 0.95mm height, rated for -40°C to +125°C operation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6414UK46, MAX6316LUK46D3+ offers lower current but omits MR functionality, while TPS3808G33DBVR targets 3.3V rails and demands layout changes - neither provides identical 4.625V monitoring with MR and open-drain output in SOT23-5.

Availability

MAX6414UK46 is available at Aetrix Electronics and suitable for automotive ECUs, industrial PLCs, and portable medical devices 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 demanding industrial, automotive, and computing applications.

The MAX6412–MAX6420 family delivers ultra-low-power, temperature-stable microprocessor supervision with flexible reset timing - engineered specifically for reliability-critical embedded systems where power efficiency and deterministic reset behavior are non-negotiable.

FAQ

What is the exact reset threshold voltage of the MAX6414UK46 and how does it vary with temperature?

The MAX6414UK46 has a nominal 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 is confirmed in the Electrical Characteristics table under "VCC Reset Threshold Accuracy" and correlates directly to the "46" suffix in Table 1 (4.509V min / 4.625V typ / 4.741V max). The device uses laser-trimmed resistors to achieve this stability.

Does the MAX6414UK46 support manual reset, and how is it implemented?

Yes, the MAX6414UK46 supports manual reset via the MR pin (Pin 3), which is active-low with a 20kΩ internal pullup resistor. Pulling MR ≤0.3×VCC asserts reset; the reset remains active for the full timeout period after MR is released. No external components are needed - a normally open momentary switch from MR to GND suffices, as documented in the Manual Reset Input section.

What is the function of the SRT pin on the MAX6414UK46 and how do I calculate the required capacitor?

The SRT pin (Pin 4) sets the reset timeout period using an external capacitor to ground. The relationship is tRP = (2.71 × 10⁶) × CSRT + 275µs, where tRP is in seconds and CSRT in farads. For example, a 1500pF capacitor yields 3.00–5.75ms timeout (typical). Ceramic capacitors with leakage <10nA are recommended, per the Application Information section.

Can the MAX6414UK46 be used to monitor voltages other than VCC, such as a 3.3V rail?

No - the MAX6414UK46 is a single-threshold, fixed-VCC monitor only. It lacks the RESET IN pin required for external voltage monitoring. For dual-rail or adjustable-threshold applications, use MAX6415–MAX6420 variants. The MAX6414UK46's pinout and functional description confirm RESET IN is absent; only VCC, MR, SRT, GND, and RESET are present.

What logic levels are compatible with the open-drain RESET output of the MAX6414UK46?

The open-drain RESET output of the MAX6414UK46 tolerates up to 5.5V on the line and can interface with any logic domain from 0V to 5.5V. As shown in Figure 5, an external pullup to 3.3V, 2.5V, or 1.8V is used to establish the high logic level. The output sinks ≥50µA at VOL ≤ 0.3V (VCC ≥ 1.0V), ensuring robust low-state drive into standard CMOS inputs.