Analog Devices Inc./Maxim Integrated MAX6444US16K+

Overview

MAX6444US16K+ from Maxim Integrated is a single-supply, fixed-threshold microprocessor reset supervisor IC with extended manual reset setup period and open-drain active-low RESET output. It monitors VCC at 1.575V ±1.5% threshold, asserts reset for ≥140ms after voltage recovery or manual trigger, and draws only 6µA typical supply current. Designed for consumer electronics and industrial equipment where nuisance resets from short switch closures must be avoided.

For engineers reviewing the MAX6444US16K+ datasheet, MAX6444US16K+ pinout, MAX6444US16K+ application, or MAX6444US16K+ equivalent, key selection criteria include its 10.08s manual reset setup time (K suffix), 1.575V reset threshold (16 suffix), SOT143-4 package, guaranteed operation down to VCC = 1.0V, and immunity to transients <20µs at 100mV overdrive.

Technical Context

The MAX6444US16K+ implements a precision bandgap-based voltage monitor with 60ppm/°C tempco and 2×VTH hysteresis, paired with a digital timing circuit that enforces a fixed 10.08s low-valid window on MR1 before asserting RESET. Its open-drain RESET output supports level-shifting up to +6V with external pullup and remains functional across -40°C to +85°C.

Unlike standard supervisors, it rejects sub-10.08s MR1 pulses-eliminating false triggers from mechanical switch bounce or ESD-induced glitches-while guaranteeing valid reset assertion even as VCC decays to 1.0V, with VOL ≤0.3V at ISINK = 50µA.

Key Specifications

Pinout & Package

MAX6444US16K+ is housed in a 4-pin SOT143 package (1.3mm × 2.1mm, 0.95mm height) with gull-wing leads, rated for -40°C to +85°C operation and RoHS-compliant lead-free finish.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6444US16K+, MAX6316LUK46D3+T offers higher voltage tolerance but less robust mechanical switch immunity, while TPS3808G15DBVR delivers superior current efficiency at the cost of manual reset functionality and design simplicity.

Availability

MAX6444US16K+ is available at Aetrix Electronics and suitable for set-top boxes, DVD players, and industrial sensor nodes requiring stable component supply, long-term lifecycle support, and automotive-grade reliability (AEC-Q100 qualified variant available).

Supply support for MAX6444US16K+ 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 power, sensing, and interface applications, with emphasis on high-reliability industrial and automotive markets.

The MAX6443–MAX6452 family was engineered specifically for consumer and industrial electronics needing immunity to mechanical switch bounce and supply transients-delivering deterministic reset timing without external components.

FAQ

What is the exact reset threshold voltage of the MAX6444US16K+?

The MAX6444US16K+ has a factory-trimmed VCC reset threshold of 1.575V, with ±1.5% tolerance over temperature (-40°C to +85°C) and 60ppm/°C tempco. This value is confirmed in the Electrical Characteristics table under "VCC Reset Threshold" for suffix "16", and applies to all operating conditions including brownout recovery and power-up sequencing.

Does the MAX6444US16K+ support open-drain or push-pull RESET output?

The MAX6444US16K+ features an open-drain active-low RESET output, as specified in the Ordering Information table and Pin Description section. It requires an external pullup resistor (minimum 20kΩ) to VCC or another logic rail. Push-pull variants exist in the same family (e.g., MAX6443), but MAX6444US16K+ is exclusively open-drain.

How long must the MR1 pin be held low to trigger a reset on the MAX6444US16K+?

The MR1 pin on MAX6444US16K+ must be held low for a minimum of 10.08 seconds-the "K" suffix denotes this extended setup period-to assert the RESET output. This value is explicitly listed in Table 2 ("Manual Reset Setup Period") and verified in the Typical Operating Circuit and Functional Diagram sections.

Is the MAX6444US16K+ qualified for automotive applications?

The MAX6444US16K+ itself is not automotive-qualified; however, the pin-compatible automotive variant MAX6444US16K/V+T is AEC-Q100 qualified and shares identical electrical specifications, package, and pinout. The "/V" suffix indicates automotive qualification per the Ordering Information table.

What is the maximum supply voltage the MAX6444US16K+ can tolerate on its VCC pin?

The MAX6444US16K+ has an absolute maximum VCC rating of +6V, as stated in the Absolute Maximum Ratings table. Its operational range is 1.0V to 5.5V, and it guarantees valid RESET output behavior across this full range-including correct VOL and VOH levels-making it suitable for 3.3V and 5V systems with margin.