Analog Devices Inc./Maxim Integrated MAX6419UK26+

Overview

MAX6419UK26+ from Maxim Integrated is a low-power dual-voltage microprocessor supervisor IC with one factory-trimmed VCC reset threshold (2.625V, ±2.5%) and one adjustable RESET IN input (1.26V threshold), active-high push-pull RESET output, capacitor-adjustable reset timeout (275µs to 5.75ms), and SOT23-5 package rated for -40°C to +125°C operation. It monitors critical power rails in automotive ECUs and battery-powered controllers.

For engineers reviewing the MAX6419UK26+ datasheet, MAX6419UK26+ pinout, MAX6419UK26+ application, or MAX6419UK26+ equivalent, key selection criteria include its dual-threshold architecture, guaranteed RESET validity down to VCC = 1V, 1.7µA typical quiescent current at 1.8V, AEC-Q100 qualification eligibility, and compatibility with external resistor-divider networks for custom voltage monitoring.

Technical Context

The MAX6419UK26+ integrates two independent reset comparators: one laser-trimmed bandgap reference for VCC (2.625V nominal) and one precision 1.26V internal reference for the high-impedance RESET IN pin, enabling simultaneous monitoring of primary supply and auxiliary rail (e.g., I/O or analog domain). Its reset assertion logic triggers on either comparator violation or manual reset deassertion.

Reset timeout is generated by a 240nA internal current source charging an external capacitor (CSRT) connected to SRT; the resulting ramp voltage is compared to a 0.65V threshold with 33mV hysteresis. The active-high push-pull RESET output drives up to 800µA at VCC ≥ 4.5V while maintaining VOH ≥ 0.8×VCC across 1.0V–5.5V supply range.

Key Specifications

Pinout & Package

SOT23-5 package: 5-pin surface-mount, 1.6mm × 2.9mm footprint, 1.1mm height, lead-free (+) variant.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-threshold supervisor applications.

Compared with MAX6419UK26+, MAX6420UK26+ offers identical monitoring functionality but requires external pull-up for RESET signaling, while TPS3808G33DBVR simplifies design for single-rail systems but sacrifices flexibility in timeout and auxiliary rail supervision.

Availability

MAX6419UK26+ is available at Aetrix Electronics and suitable for automotive ECUs, medical infusion pumps, industrial PLC I/O modules, and portable test equipment requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MAX6419UK26+ 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 medical applications.

The MAX6412–MAX6420 product line delivers low-power, capacitor-adjustable microprocessor supervisors optimized for dual-rail monitoring in safety-critical embedded systems operating from -40°C to +125°C.

FAQ

What is the exact VCC reset threshold voltage for MAX6419UK26+?

The MAX6419UK26+ features a factory-laser-trimmed VCC reset threshold of 2.625V, with ±2.5% accuracy over the full -40°C to +125°C operating temperature range. This value is confirmed in Table 1 of the datasheet (suffix "26" corresponds to 2.559V min / 2.625V typ / 2.691V max), and applies specifically to the MAX6419UK26+ variant within the MAX6418–MAX6420 dual-monitor family.

How do I calculate the external resistor values for the adjustable RESET IN input on MAX6419UK26+?

To set a custom monitored voltage (VMON_TH) on the MAX6419UK26+ RESET IN pin, use R1 = R2 × (VMON_TH / 1.26V − 1), where R2 is typically 1MΩ. For example, to monitor 5.0V, R1 = 1MΩ × (5.0 / 1.26 − 1) ≈ 2.97MΩ. The MAX6419UK26+ uses its internal 1.26V reference to compare the divided voltage, enabling precise dual-rail supervision.

What is the minimum and maximum reset timeout period achievable with MAX6419UK26+?

The MAX6419UK26+ reset timeout ranges from 275µs (with CSRT = 0F) to 5.75ms (with CSRT = 1500pF), calculated using tRP = (2.71 × 10⁶) × CSRT + 275µs. This range accommodates most microprocessor reset timing requirements, and the capacitor must be low-leakage (<10nA), with ceramic recommended for stability across temperature.

Does MAX6419UK26+ support operation at VCC = 1.0V, and what is the RESET output behavior?

Yes, the MAX6419UK26+ is fully specified down to VCC = 1.0V. Its active-high RESET output remains valid (VOH ≥ 0.8×VCC) and functional at this voltage, ensuring deterministic reset assertion during deep brownout. At VCC < 1.0V, performance is not guaranteed, but the device maintains RESET validity longer than many competitors due to its robust internal biasing.

Is MAX6419UK26+ qualified for automotive applications, and what packaging options are available?

The MAX6419UK26+ is offered in lead-free (+) packaging and is eligible for AEC-Q100 qualification; specific /V automotive-grade variants (e.g., MAX6419UK26/V+T) are available per ordering information. All versions use the industry-standard SOT23-5 package (U5+2 outline), with tape-and-reel delivery and -40°C to +125°C operation.