Analog Devices Inc./Maxim Integrated MXD1813XR41+

Overview

MXD1813XR41+ from Maxim Integrated is a low-power microprocessor reset supervisor IC designed for +5V systems, featuring an open-drain active-low RESET output with internal 5.5kΩ pullup resistor, factory-set 4.12V reset threshold (±2.5% over temperature), 100ms minimum reset timeout, and debounced manual-reset detection triggered by >1.5μs low pulse on RESET pin. It operates from -40°C to +105°C in SC70-3 package and is used in portable/battery-powered equipment requiring reliable power-on reset and push-button recovery.

For engineers reviewing the MXD1813XR41+ datasheet, MXD1813XR41+ pinout, MXD1813XR41+ application, or MXD1813XR41+ equivalent, key selection criteria include reset threshold accuracy at 4.12V, guaranteed RESET validity down to VCC = +1V, manual-reset debounce timing, open-drain drive capability (10mA sink), and compatibility with 5V μP systems requiring no external components.

Technical Context

The MXD1813XR41+ implements a precision voltage comparator with hysteresis-free threshold detection and an internal monostable timer that asserts RESET for ≥100ms after VCC rises above 4.12V or after release of a debounced manual reset. Its BiCMOS process enables 4μA typical supply current and immunity to transients ≤200ns at 4.12V overdrive.

Unlike push-pull variants, the MXD1813XR41+ uses open-drain output architecture with integrated pullup, enabling direct interface to bidirectional μP reset pins without external resistors. Manual-reset functionality is implemented via dedicated input logic that filters switch bounce and triggers a separate 100ms timeout independent of power-fail detection.

Key Specifications

Pinout & Package

MXD1813XR41+ is housed in a 3-pin SC70 package (outline X3-2, land pattern 90-0208) with gull-wing leads, rated for -40°C to +105°C operation and RoHS-compliant (lead-free, indicated by '+' suffix).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MXD1813XR41+, MAX809TRD3+T offers simpler power-monitoring-only functionality without manual reset, while TPS3808G33DBVR trades integrated debounce and fixed 100ms timing for adjustable delay and lower ICC-neither is pin-compatible, requiring layout changes and revalidation for RESET signal routing and timing margins.

Availability

MXD1813XR41+ is available at Aetrix Electronics and suitable for computers and controllers, portable/battery-powered equipment, intelligent instruments, and set-top boxes requiring stable component supply across industrial temperature ranges and long-term production continuity.

Supply support for MXD1813XR41+ 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 is a semiconductor company specializing in analog and mixed-signal ICs, now part of Analog Devices, with expertise in power management, sensing, and interface solutions for industrial, automotive, and consumer markets.

The MXD1810–MXD1813/MXD1815–MXD1818 product line delivers highly integrated, low-power microprocessor reset supervisors targeting cost-sensitive, space-constrained applications where reliability under brownout and user-initiated reset are critical.

FAQ

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

The MXD1813XR41+ has a factory-set reset threshold of 4.12V, with guaranteed accuracy of ±2.5% over the full operating temperature range of -40°C to +105°C. This specification ensures consistent brownout detection across environmental extremes without requiring external calibration. The 4.12V threshold is specifically selected for +5V systems where reliable reset assertion must occur before critical logic levels degrade.

Does the MXD1813XR41+ support manual reset, and how does its debounce function work?

Yes, the MXD1813XR41+ includes a dedicated debounced manual-reset feature. When the RESET pin is pulled low for more than 1.5μs, the device asserts its open-drain RESET output for a guaranteed minimum of 100ms after the external signal is released. This internal logic filters out mechanical switch bounce and ensures only intentional user resets trigger the timeout, eliminating need for external RC networks or firmware debouncing.

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

The MXD1813XR41+ is supplied in a 3-pin SC70 package (outline X3-2, land pattern 90-0208), measuring 2.0mm × 1.25mm with gull-wing leads. The '+' suffix in the part number explicitly denotes lead-free, RoHS-compliant construction per Maxim Integrated's packaging standards, verified through certified material declarations and manufacturing process controls.

Can the MXD1813XR41+ operate reliably when the supply voltage drops below 2V?

Yes, the MXD1813XR41+ guarantees correct RESET/RESET logic state down to VCC = +1V, and its electrical specifications are validated from +1.2V to +5.5V. This extended low-voltage operation ensures deterministic reset behavior during deep brownout events, allowing safe shutdown sequencing in battery-powered systems where supply may sag significantly before complete failure.

How does the open-drain output of the MXD1813XR41+ differ from push-pull alternatives in the same family?

The MXD1813XR41+ uses an open-drain active-low RESET output with an internal 5.5kΩ pullup resistor to VCC, enabling wired-OR connections and direct interfacing with bidirectional μP reset pins (e.g., Motorola 68HC11) without external components. In contrast, push-pull variants like MXD1812 assert both high and low states actively, limiting flexibility in multi-source reset architectures but offering faster rise times without relying on external pullups.