Analog Devices Inc./Maxim Integrated MAX6383XR40D1+

Overview

MAX6383XR40D1+ from Maxim Integrated is a low-power microprocessor supervisory circuit with open-drain active-low reset output, factory-set 4.00V reset threshold (±2.5% over -40°C to +125°C), 1ms minimum reset timeout, and 3µA supply current at +1.8V. It monitors VCC in battery-powered systems and portable electronics where precise brownout detection and ultra-low quiescent current are critical.

For engineers reviewing the MAX6383XR40D1+ datasheet, MAX6383XR40D1+ pinout, MAX6383XR40D1+ application, or MAX6383XR40D1+ equivalent, key selection factors include its SC70-3 package, guaranteed reset validity down to VCC = 1V, open-drain output requiring external pull-up, and compatibility with dual-voltage monitoring architectures using auxiliary reset inputs on related variants.

Technical Context

The MAX6383XR40D1+ implements a precision bandgap-based reset comparator with ±2.5% threshold accuracy across -40°C to +125°C and 60ppm/°C tempco. Its internal timer guarantees a minimum 1ms reset assertion after VCC recovers above 4.00V.

As a member of the MAX6381–MAX6390 family, it shares BiCMOS process technology (647 transistors) and negative-going VCC transient immunity-rejecting glitches up to 35µs wide when VCC drops 100mV below threshold-while consuming only 3µA at 1.8V.

Key Specifications

Pinout & Package

MAX6383XR40D1+ uses the 3-pin SC70-3 package (X3-2 pkg code), 1.25mm × 0.85mm × 0.5mm, lead-free, with thermal pad omitted. Pin 1 = RESET (open-drain active-low), Pin 2 = VCC, Pin 3 = GND.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6326LTR40D1+, MAX6383XR40D1+ offers lower supply current (3µA vs. 8µA at 1.8V) and smaller footprint (SC70-3 vs. SOT-23-5), while TPS3808G33DBVR trades threshold flexibility for tighter 0.5% initial accuracy-but cannot replace MAX6383XR40D1+ in 4.00V or 5V monitoring roles.

Availability

MAX6383XR40D1+ is available at Aetrix Electronics and suitable for battery-powered medical sensors, industrial PLC I/O modules, automotive body control units, and smart energy meters requiring stable component supply with guaranteed long-term availability.

Supply support for MAX6383XR40D1+ 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 industrial, automotive, and computing applications, with emphasis on reliability and low-power operation.

The MAX6381–MAX6390 product line delivers single/dual low-voltage supervisory circuits optimized for ultra-low ICC, high-accuracy reset thresholds, and robust transient immunity in space-constrained embedded systems.

FAQ

What is the exact reset threshold voltage of the MAX6383XR40D1+?

The MAX6383XR40D1+ has a factory-set nominal reset threshold of 4.00V, with guaranteed limits of 3.90V (minimum) and 4.10V (maximum) over the full operating temperature range of -40°C to +125°C. This value is laser-trimmed during production and specified with ±2.5% accuracy, making it suitable for reliable brownout detection on +5V or +3.3V logic supplies. The MAX6383XR40D1+ datasheet confirms this in the Reset Thresholds table under suffix "40".

Does the MAX6383XR40D1+ require an external pull-up resistor on the RESET pin?

Yes, the MAX6383XR40D1+ features an open-drain active-low RESET output, which requires an external pull-up resistor to a valid logic rail (e.g., VCC or another system voltage). Without this resistor, the RESET signal cannot achieve a defined high state. Typical values range from 10kΩ to 100kΩ depending on bus capacitance and rise-time requirements. This design allows level-shifting and wired-OR configurations not possible with push-pull outputs like those in the MAX6326LTR40D1+.

What is the minimum supply voltage at which the MAX6383XR40D1+ guarantees correct RESET output logic state?

The MAX6383XR40D1+ guarantees valid RESET output logic state down to VCC = 1.0V, as explicitly stated in the Electrical Characteristics table under "Reset Output State Guaranteed Valid Down to VCC = 1V". Below 1.0V, the internal circuitry may not operate reliably, and the RESET pin state is undefined. This feature ensures deterministic behavior during deep brownout conditions common in battery-depleted systems, unlike many competitors that specify operation only down to 1.8V or higher.

Can the MAX6383XR40D1+ monitor a second voltage rail?

No, the MAX6383XR40D1+ does not support auxiliary voltage monitoring. It is a single-supply supervisory device that monitors only the VCC pin. Variants such as MAX6387, MAX6388, and MAX6389 include a dedicated RESET IN pin for monitoring a second voltage via an external resistor divider, but the MAX6383XR40D1+ lacks this pin and internal comparator. Its pinout is limited to RESET, VCC, and GND in the SC70-3 package, confirming single-rail functionality per the Pin Description table.

What package type and dimensions does the MAX6383XR40D1+ use?

The MAX6383XR40D1+ uses the SC70-3 package (pkg code X3-2), measuring 1.25mm × 0.85mm × 0.5mm with a 0.65mm pin pitch. It is lead-free and RoHS-compliant, with no thermal pad. This 3-pin outline is distinct from the 4-pin SC70 or 6-pin µDFN packages used by other members of the MAX6381–MAX6390 family (e.g., MAX6384XS40D1+). The top-marking and pin 1 indicator follow standard SC70 conventions, and the package drawing is documented in Maxim's 21-0075 specification.