Analog Devices Inc./Maxim Integrated MAX6383XR24D3+T

Overview

MAX6383XR24D3+T from Maxim Integrated is a low-power microprocessor supervisory circuit with open-drain active-low reset output, factory-set 2.40V reset threshold (±2.5% over –40°C to +125°C), and 140ms minimum reset timeout period. It monitors VCC from +1.8V to +5.0V while consuming only 3μA at +1.8V, and guarantees valid reset state down to VCC = 1V. It is used in portable battery-powered equipment for reliable power-on reset and brownout protection.

For engineers reviewing the MAX6383XR24D3+T datasheet, MAX6383XR24D3+T pinout, MAX6383XR24D3+T application, or MAX6383XR24D3+T equivalent, key selection considerations include its 2.40V threshold accuracy, 140ms timeout, open-drain output requiring external pullup, SC70-3 package footprint, and compatibility with dual-voltage monitoring systems where auxiliary reset input is not required.

Technical Context

The MAX6383XR24D3+T implements a precision bandgap-based voltage comparator with ±2.5% threshold tolerance over temperature, paired with a monolithic timer that enforces a guaranteed minimum 140ms reset assertion after VCC recovers above 2.40V. Its open-drain RESET output requires an external pullup resistor and remains valid down to VCC = 1V, enabling robust reset signaling even during deep undervoltage conditions.

Unlike variants with manual reset (MR) or auxiliary RESET IN inputs, the MAX6383XR24D3+T is a dedicated single-supply monitor - it lacks MR and RESET IN pins, simplifying layout in space-constrained applications where only VCC supervision is needed. Its 3-pin SC70 package contains only VCC, GND, and RESET terminals.

Key Specifications

Pinout & Package

MAX6383XR24D3+T is housed in a 3-pin SC70 package (outline 21-0075, land pattern 90-0208), with exposed pad not connected internally. The compact 1.25mm × 0.85mm body height of 0.5mm supports high-density routing in portable designs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX809TRD3+T, MAX6383XR24D3+T offers open-drain flexibility for shared reset buses and lower current at sub-2V supplies; compared with TPS3808G33DBVR, it provides smaller footprint and lower cost for 2.4V/140ms use cases, though with wider threshold tolerance and no SOT-23-5 compatibility.

Availability

MAX6383XR24D3+T is available at Aetrix Electronics and suitable for portable/battery-powered equipment, critical μP and μC power monitoring, and dual voltage systems requiring stable component supply and long-term lifecycle support.

Supply support for MAX6383XR24D3+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 power, sensing, connectivity, and security applications, with emphasis on low-power, high-reliability solutions.

The MAX6381–MAX6390 family delivers single/dual low-voltage microprocessor supervisory circuits optimized for space-constrained, battery-sensitive systems requiring accurate, low-current reset generation without manual reset or auxiliary monitoring features.

FAQ

What is the exact reset threshold voltage of MAX6383XR24D3+T, and how stable is it over temperature?

The MAX6383XR24D3+T has a factory-set nominal reset threshold of 2.40V, with guaranteed tolerance of ±2.5% over the full operating temperature range of –40°C to +125°C. This corresponds to a minimum threshold of 2.34V and maximum of 2.46V at temperature extremes, ensuring reliable detection of 2.5V rail collapse without false resets due to thermal drift. The MAX6383XR24D3+T achieves this via laser-trimmed bandgap references during wafer test.

Does MAX6383XR24D3+T include a manual reset input (MR) or auxiliary RESET IN pin?

No, the MAX6383XR24D3+T does not include a manual reset input (MR) or auxiliary RESET IN pin. It is a dedicated single-supply supervisor with only three terminals: VCC, GND, and open-drain RESET. This distinguishes it from members of the same family such as MAX6384 (which adds MR) or MAX6387 (which adds RESET IN). The MAX6383XR24D3+T is intended for applications where only VCC monitoring is required.

What is the minimum VCC voltage at which MAX6383XR24D3+T guarantees correct RESET output logic state?

The MAX6383XR24D3+T guarantees valid RESET output logic state down to VCC = 1.0V. Below this voltage, the internal circuitry may not maintain defined output behavior. This feature ensures deterministic reset signaling during deep brownout or battery depletion scenarios - for example, when a lithium coin cell discharges from 3.0V to 1.1V. The MAX6383XR24D3+T remains functional and asserts RESET correctly throughout this range.

What package type and footprint does MAX6383XR24D3+T use, and is it RoHS-compliant?

The MAX6383XR24D3+T uses a 3-pin SC70 package (outline number 21-0075, land pattern 90-0208), measuring 1.25mm × 0.85mm with 0.5mm height. The "+T" suffix confirms it is lead(Pb)-free and RoHS-compliant. This compact footprint enables placement in ultra-dense layouts typical of wearables and medical sensors, and is pin-compatible with other 3-pin SC70 supervisors including MAX809 variants.

How does the open-drain RESET output of MAX6383XR24D3+T differ from push-pull outputs in the same family?

The open-drain RESET output of MAX6383XR24D3+T requires an external pullup resistor to define the high state, enabling wired-OR connection with other reset sources and level translation across voltage domains (e.g., pulling up to 3.3V while monitoring a 1.8V rail). In contrast, push-pull variants like MAX6381 assert both high and low actively - they do not require external components but cannot share a common reset net. This makes the MAX6383XR24D3+T uniquely suited for multi-source reset architectures.