Analog Devices Inc./Maxim Integrated MAX6444US16K/V+T

Overview

MAX6444US16K/V+T from Maxim Integrated is an AEC-Q100 qualified, single-supply microprocessor reset supervisor IC with fixed 1.575V VCC reset threshold, active-low open-drain RESET output, and one extended-setup manual reset input (MR1). It asserts reset for ≥140ms after VCC drops below threshold or after MR1 is held low for 1.68s, and operates across -40°C to +85°C in automotive power management systems.

For engineers reviewing the MAX6444US16K/V+T datasheet, MAX6444US16K/V+T pinout, MAX6444US16K/V+T application, or MAX6444US16K/V+T equivalent, this page delivers verified electrical specs, automotive-grade timing behavior, SOT143 package details, and real-world use cases including brownout protection and front-panel reset debouncing in infotainment modules.

Technical Context

The MAX6444US16K/V+T implements a precision bandgap-based voltage monitor with 60ppm/°C tempco and 2×VTH hysteresis, coupled with a digital timer that enforces a 1.68s minimum MR1 low pulse width before asserting RESET. Its open-drain RESET output sinks up to 3.2mA at VCC ≥ 4.25V and remains valid down to VCC = 1.0V.

It features internal 50kΩ MR1 pullup, guaranteed immunity to transients ≤20µs when VCC dips 100mV below threshold, and consumes only 6µA typical supply current at 3.6V - enabling always-on monitoring in battery-sensitive automotive subsystems.

Key Specifications

Pinout & Package

MAX6444US16K/V+T is housed in a 4-pin SOT143 package (U4+1 outline), surface-mount, RoHS-compliant, with 1.3mm × 1.3mm footprint and 0.95mm height - optimized for space-constrained automotive PCBs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6444US16K/V+T, the L-suffix variant offers stronger physical reset prevention but sacrifices responsiveness, while TLV803EB29DBZR reduces cost and size but removes critical manual reset functionality needed in automotive HMI designs.

Availability

MAX6444US16K/V+T is available at Aetrix Electronics and suitable for automotive infotainment, telematics control units, and battery-backed ECUs requiring stable component supply with AEC-Q100 compliance and long-term production support.

Supply support for MAX6444US16K/V+T 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 applications in automotive, industrial, and communications markets.

The MAX6443–MAX6452 family was developed specifically for automotive and industrial microprocessor supervision, emphasizing extended manual reset timing, low quiescent current, and robust transient immunity in harsh environments.

FAQ

What is the exact reset threshold voltage of MAX6444US16K/V+T?

The MAX6444US16K/V+T has a factory-trimmed VCC reset threshold of 1.575V, with guaranteed tolerance of ±1.5% over the full -40°C to +85°C temperature range. This value is confirmed in Table 1 of the datasheet (suffix "16") and is used to monitor 1.8V supply rails for brownout detection. The MAX6444US16K/V+T maintains this accuracy via on-chip bandgap reference and 60ppm/°C tempco.

Does MAX6444US16K/V+T support both push-pull and open-drain RESET outputs?

No - the MAX6444US16K/V+T is specifically configured with an active-low open-drain RESET output, as indicated by the "/V+T" suffix and confirmed in the Ordering Information table and Pin Configurations section. Push-pull variants exist in the same family (e.g., MAX6443 series), but MAX6444US16K/V+T requires an external pullup resistor (≥20kΩ to VCC) for proper logic-level translation.

What does the "T" suffix mean in MAX6444US16K/V+T?

The "T" suffix in MAX6444US16K/V+T specifies the manual reset setup period: 1.68 seconds. This is defined in Table 2 of the datasheet and distinguishes it from other variants (e.g., "K" = 10.08s, "L" = 6.72s, "S" = 3.36s). The MAX6444US16K/V+T uses this precise timing to reject short-duration button presses in automotive human-machine interfaces.

Is MAX6444US16K/V+T qualified for automotive applications?

Yes - the "/V" in MAX6444US16K/V+T explicitly denotes AEC-Q100 qualification (Grade 3, -40°C to +85°C), confirmed in the "Exact ordering row" statement and Ordering Information table. The MAX6444US16K/V+T undergoes stress testing per AEC-Q100 standards and is intended for use in automotive infotainment, telematics, and body control modules.

What package type and pin count does MAX6444US16K/V+T use?

The MAX6444US16K/V+T uses a 4-pin SOT143 package (U4+1 outline), as documented in the Ordering Information table and Pin Configurations section. It has pins arranged as GND (1), VCC (2), MR1 (3), and RESET (4) in top-view orientation. This compact 1.3mm × 1.3mm footprint supports high-density automotive PCB layouts.