Analog Devices Inc./Maxim Integrated MAX6383LT28D2+T

Overview

MAX6383LT28D2+T from Maxim Integrated is a low-power microprocessor supervisory circuit with open-drain active-low reset output, factory-set 2.80V reset threshold (±2.5% over -40°C to +125°C), 20ms minimum reset timeout, and guaranteed operation down to VCC = 1.0V. It monitors single supply voltage in space-constrained embedded systems requiring reliable power-on reset and brownout protection.

For engineers reviewing the MAX6383LT28D2+T datasheet, MAX6383LT28D2+T pinout, MAX6383LT28D2+T application, or MAX6383LT28D2+T equivalent, key selection criteria include its 2.80V threshold accuracy, 20ms timeout, open-drain output requiring external pullup, 3μA supply current at 1.8V, and 6-pin μDFN package compatibility with industrial and automotive-grade designs.

Technical Context

The MAX6383LT28D2+T implements a precision bandgap-based voltage comparator with ±2.5% threshold tolerance across -40°C to +125°C and 60ppm/°C tempco. Its internal timer generates a fixed 20ms reset assertion window after VCC rises above 2.80V.

As an open-drain active-low reset device, it requires an external pullup resistor on the RESET pin and guarantees valid logic state down to VCC = 1.0V. It lacks manual reset (MR) and auxiliary RESET IN inputs-features reserved for other members of the MAX6381–MAX6390 family.

Key Specifications

Pinout & Package

MAX6383LT28D2+T is housed in a 6-pin μDFN package (Outline Number 21-0147, Land Pattern 90-0080), measuring 2mm × 2mm with 0.5mm pitch and exposed thermal pad. The package is RoHS-compliant and lead-free (+ suffix).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6326XR28D2+T, MAX6383LT28D2+T offers identical electrical specs but in a 6-pin μDFN for improved thermal performance and routing flexibility; compared with TPS3808G33DBVR, it provides tighter 2.80V threshold matching and open-drain compatibility with legacy reset buses.

Availability

MAX6383LT28D2+T is available at Aetrix Electronics and suitable for industrial PLC I/O modules, automotive body control units, medical wearable sensors, and smart energy meters requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MAX6383LT28D2+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, mixed-signal, and power management ICs for demanding industrial, automotive, and computing applications.

The MAX6381–MAX6390 family delivers low-power, high-accuracy voltage supervision for microprocessor reset in space- and power-constrained systems, with variants optimized for single/dual supply monitoring, manual reset, and automotive qualification.

FAQ

What is the exact reset threshold voltage of MAX6383LT28D2+T and how tightly is it specified?

The MAX6383LT28D2+T has a factory-set nominal reset threshold of 2.80V, guaranteed within ±2.5% over the full operating temperature range of -40°C to +125°C. This specification is confirmed in the Electrical Characteristics table of the official datasheet, with typical tempco of 60ppm/°C. The "28" suffix in MAX6383LT28D2+T explicitly denotes the 2.80V threshold variant.

Does MAX6383LT28D2+T include a manual reset input (MR) or auxiliary RESET IN pin?

No, MAX6383LT28D2+T does not include a manual reset input (MR) or auxiliary RESET IN pin. According to the Selector Guide and Pin Configurations section, only MAX6384–MAX6386 and MAX6390 feature MR, while MAX6387–MAX6389 include RESET IN. MAX6383 is explicitly listed as having neither function - it is a single-supply, open-drain reset supervisor with no additional control inputs.

What package type and dimensions does MAX6383LT28D2+T use, and is it RoHS-compliant?

MAX6383LT28D2+T uses a 6-pin μDFN package (Outline Number 21-0147), measuring 2.0mm × 2.0mm with 0.5mm pin pitch and an exposed thermal pad. The "+T" suffix confirms it is lead-free and RoHS-compliant. Thermal resistance is θJA = 477°C/W and θJC = 122°C/W on a multilayer board, per JEDEC JESD51-7 test methodology.

What is the minimum supply voltage at which MAX6383LT28D2+T guarantees correct reset output behavior?

MAX6383LT28D2+T guarantees valid reset output logic state down to VCC = 1.0V, as stated in both the Absolute Maximum Ratings and Detailed Description sections. This means the open-drain RESET pin will correctly assert low when VCC falls below 2.80V and remain asserted until VCC rises above threshold and the 20ms timeout expires - even if VCC never exceeds 1.0V during brownout recovery.

How does the open-drain output of MAX6383LT28D2+T differ from push-pull alternatives, and what external component is required?

The open-drain output of MAX6383LT28D2+T requires an external pullup resistor to a defined voltage rail (e.g., 3.3V or 5V) to establish the high state of the RESET signal. Unlike push-pull outputs, it cannot actively drive high - only sink current when asserted low. This enables wired-OR reset bus configurations where multiple supervisors share one reset line, a key advantage in complex multi-IC systems.