Analog Devices Inc./Maxim Integrated MXD1813XR41+T

Overview

MXD1813XR41+T from Maxim Integrated is an open-drain, active-low microprocessor reset IC with debounced manual-reset capability, designed for +5V systems requiring precise brownout detection at 4.12V threshold, 100ms minimum reset timeout, and operation down to VCC = +1V. It monitors supply voltage integrity in embedded controllers and portable equipment where reliable power-on initialization and pushbutton recovery are critical.

For engineers reviewing the MXD1813XR41+T datasheet, MXD1813XR41+T pinout, MXD1813XR41+T application, or MXD1813XR41+T equivalent, key selection criteria include its 4.12V reset threshold accuracy (±2.5%), 4μA quiescent current, SC70-3 package footprint, and integrated 5.5kΩ internal pullup resistor enabling direct interface with bidirectional μP reset pins without external components.

Technical Context

The MXD1813XR41+T implements a precision bandgap-based voltage comparator with hysteresis to detect VCC falling below 4.12V (±2.5% over -40°C to +105°C), asserting RESET low for ≥100ms after VCC recovers. Its internal debouncing circuit responds only to RESET pin low pulses ≥1.5μs, rejecting mechanical switch bounce while triggering a second 100ms reset timeout upon release.

This device uses BiCMOS process technology and features transient immunity-rejecting negative VCC glitches up to 200mV overdrive for durations under 10μs-and guarantees valid RESET output state down to VCC = +1V, ensuring deterministic behavior during deep brownout conditions.

Key Specifications

Pinout & Package

MXD1813XR41+T is housed in a 3-pin SC70 package (outline X3-2), measuring 2.0mm × 1.25mm × 0.95mm, optimized for space-constrained PCB layouts in portable electronics.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MXD1813XR41+T, MAX809TRD3+T offers identical package and footprint but omits manual reset debouncing-requiring external components for pushbutton use-while TPS3808G33DBVR delivers lower quiescent current and adjustable timeout but targets 3.3V systems and occupies more board area due to 5-pin SOT23 packaging.

Availability

MXD1813XR41+T is available at Aetrix Electronics and suitable for computers and controllers, intelligent instruments, and portable/battery-powered equipment requiring stable component supply across industrial temperature ranges and long-lifecycle programs.

Supply support for MXD1813XR41+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 high-performance analog and mixed-signal semiconductor solutions for industrial, communications, and consumer applications.

The MXD1813XR41+T belongs to the MXD1810–MXD1813/MXD1815–MXD1818 family of low-power μP reset circuits, engineered specifically for reliable power-supply monitoring in space-constrained, battery-sensitive embedded systems operating from +2.5V to +5V rails.

FAQ

What is the exact reset threshold voltage of the MXD1813XR41+T and how tightly is it specified?

The MXD1813XR41+T has a factory-set reset threshold of 4.12V, guaranteed over the full operating temperature range (-40°C to +105°C) with ±2.5% accuracy. This specification ensures consistent brownout detection across environmental extremes without requiring system-level calibration. The value is trimmed during production and documented in the Electrical Characteristics table of the official Maxim datasheet for MXD1813XR41+T.

Does the MXD1813XR41+T support manual reset functionality, and how does it handle switch bounce?

Yes, the MXD1813XR41+T includes integrated debounced manual-reset detection: it asserts reset only when the RESET pin is held low for ≥1.5μs, effectively filtering out mechanical switch bounce. Upon release, it initiates a 100ms minimum reset timeout period. This eliminates the need for external RC networks or firmware debouncing logic, making MXD1813XR41+T ideal for front-panel reset buttons in ruggedized equipment.

What package type and dimensions does the MXD1813XR41+T use, and is it RoHS-compliant?

The MXD1813XR41+T is supplied in a 3-pin SC70 package (outline X3-2), measuring 2.0mm × 1.25mm × 0.95mm. The "+T" suffix explicitly denotes lead(Pb)-free, RoHS-compliant construction per Maxim Integrated's packaging standards. Land pattern requirements follow Maxim document 90-0208, and the device is qualified for reflow soldering per JEDEC J-STD-020.

Can the MXD1813XR41+T operate reliably when the supply voltage drops below 2.0V?

Yes-the MXD1813XR41+T guarantees valid RESET/RESET logic states down to VCC = +1.0V, as confirmed in the Absolute Maximum Ratings and Electrical Characteristics tables. This ensures deterministic reset behavior during deep brownout conditions common in battery-powered systems nearing end-of-life, unlike many competing reset ICs that lose output validity below 1.8V.

How does the internal pullup resistor in the MXD1813XR41+T affect system design?

The MXD1813XR41+T integrates a 5.5kΩ internal pullup resistor on its open-drain RESET pin, allowing direct connection to bidirectional μP reset inputs (e.g., Motorola 68HC11) without external components. This simplifies layout, reduces BOM count, and ensures proper logic-high idle state-even if the host processor drives the line high-while maintaining full sink capability (>10mA) during reset assertion.