Analog Devices Inc./Maxim Integrated MAX6419UK22+

Overview

MAX6419UK22+ from Maxim Integrated is an automotive-grade, dual-voltage microprocessor supervisor IC in SOT23-5 package, featuring a factory-trimmed 2.188V ±2.5% VCC reset threshold and an adjustable RESET IN input (1.26V reference) for monitoring secondary supply rails. It delivers active-high push-pull RESET output with capacitor-adjustable timeout (275µs to 5.75ms), 1.7µA typical quiescent current at 2V, and guaranteed operation from -40°C to +125°C - used in battery-powered controllers and critical μP monitoring where dual-rail brownout detection is required.

For engineers reviewing the MAX6419UK22+ datasheet, MAX6419UK22+ pinout, MAX6419UK22+ application, or MAX6419UK22+ equivalent, key selection criteria include its dual-threshold architecture (fixed + adjustable), AEC-Q100 qualification, SRT-capacitor–programmable reset delay, and active-high push-pull output compatibility with 1.8V–5.5V µP reset inputs.

Technical Context

The MAX6419UK22+ implements two independent voltage-monitoring comparators: one laser-trimmed for VCC (2.188V nominal) and one referenced to a stable 1.26V internal bandgap for external rail monitoring via RESET IN. Reset assertion occurs if either voltage falls below its threshold or manual reset is triggered - though MAX6419 lacks MR pin, relying solely on VCC and RESET IN inputs.

Its reset timeout is generated by a precision 240nA current source charging an external capacitor (SRT-to-GND), with deassertion occurring when the ramp reaches 0.65V. The active-high push-pull RESET output drives high to VCC (≥0.8×VCC at 150µA) and sinks ≤0.4V at 3.2mA, ensuring robust logic-level compatibility across 1.0V–5.5V supply ranges.

Key Specifications

Pinout & Package

SOT23-5 package (5-pin, 1.6mm × 2.9mm, 0.95mm height), RoHS-compliant, lead-free (+ suffix), thermal pad not present. Pin 1 marked with dot; pin 1 is RESET, pin 2 is GND, pin 3 is RESET IN, pin 4 is SRT, pin 5 is VCC.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6419UK22+, MAX6420UK22+ trades push-pull drive strength for bus-sharing flexibility, while TPS3808G33DBVR sacrifices dual-voltage supervision and timeout adjustability for lower unit cost and simpler layout - making MAX6419UK22+ optimal for automotive and industrial dual-rail systems demanding precision, flexibility, and qualification.

Availability

MAX6419UK22+ is available at Aetrix Electronics and suitable for automotive ECUs, portable medical devices, and industrial PLCs requiring stable component supply with AEC-Q100 assurance and extended temperature support.

Supply support for MAX6419UK22+ 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 automotive, industrial, and computing applications.

The MAX6412–MAX6420 product line delivers low-power, capacitor-programmable microprocessor supervisors optimized for dual-rail voltage monitoring in harsh environments - targeting automotive body electronics, medical instrumentation, and battery-constrained embedded systems.

FAQ

What is the exact VCC reset threshold voltage for MAX6419UK22+?

The MAX6419UK22+ has a factory-laser-trimmed VCC reset threshold of 2.188V, with ±2.5% tolerance over the full -40°C to +125°C operating temperature range. This value is confirmed in Table 1 of the datasheet (suffix "22") and applies specifically to the MAX6419UK22+ variant - not to other suffixes or family members. The threshold is guaranteed by design and production-tested at +25°C.

Does MAX6419UK22+ include a manual reset (MR) input?

No, the MAX6419UK22+ does not include a manual reset (MR) input. Per the Selector Guide and Pin Description, only MAX6412/MAX6413/MAX6414 and MAX6418/MAX6419/MAX6420 feature dual-voltage monitoring, but MAX6419 omits the MR pin to accommodate the RESET IN function in the 5-pin SOT23-5 package. Reset is triggered exclusively by VCC falling below 2.188V or RESET IN falling below its programmed threshold.

How is the reset timeout period calculated for MAX6419UK22+?

The reset timeout period (tRP) for MAX6419UK22+ is calculated using tRP = (2.71 × 10⁶) × CSRT + 275µs, where tRP is in seconds and CSRT is the capacitor value in farads connected between SRT and GND. For example, a 1500pF capacitor yields 4.375ms typical timeout. This formula is validated in the Electrical Characteristics table and Typical Operating Characteristics plots (toc03).

Is MAX6419UK22+ qualified for automotive applications?

Yes, MAX6419UK22+ is AEC-Q100 qualified (Grade 0, -40°C to +125°C) as indicated by the "/V" option in ordering information and confirmed in the Benefits and Features section. The "+" suffix denotes lead-free packaging, and the full part number MAX6419UK22+/V+T (or equivalent automotive-grade variant) meets automotive reliability standards - including HTOL, TC, and ESD testing per AEC-Q100 Rev H.

What is the maximum leakage current allowed on the RESET IN pin of MAX6419UK22+?

The RESET IN pin of MAX6419UK22+ has a maximum leakage current of 10nA, as specified in the Electrical Characteristics table under "RESET IN Leakage Current." This low input bias enables use of high-value resistor dividers (e.g., 1MΩ–10MΩ) without introducing significant threshold error - critical for accurate secondary rail monitoring in low-power systems.