Analog Devices Inc./Maxim Integrated MXD1815XR22

Overview

MXD1815XR22 from Maxim Integrated is a precision low-power microprocessor reset supervisor IC designed for +2.5V/+3.0V/+3.3V digital systems. It monitors VCC and asserts an active-low open-drain RESET signal when supply voltage falls below 2.18V (±2.5% over temperature), maintains reset for ≥100ms after VCC recovery, draws only 4μA typical supply current, and operates across –40°C to +105°C - ideal for battery-powered portable equipment requiring reliable power-on reset.

For engineers reviewing the MXD1815XR22 datasheet, MXD1815XR22 pinout, MXD1815XR22 application, or MXD1815XR22 equivalent, key selection criteria include its factory-trimmed 2.18V reset threshold, SC70-3 package compatibility, open-drain output with internal 5.5kΩ pullup, guaranteed RESET validity down to VCC = +1V, and immunity to fast VCC transients - all critical for embedded μP reset integrity in space-constrained industrial and portable designs.

Technical Context

The MXD1815XR22 implements a precision bandgap-based voltage comparator with hysteresis to detect VCC drops below its 2.18V threshold, coupled with a monolithic timer that enforces a minimum 100ms reset timeout period after VCC rises above threshold. Its open-drain RESET output includes an integrated 5.5kΩ pullup resistor to VCC, eliminating external components while enabling direct interface with bidirectional μP reset pins.

This device belongs to the MXD1815–MXD1818 subfamily optimized for 2.5V/3.0V/3.3V systems and shares BiCMOS process technology, –40°C to +105°C operation, and SC70/SOT23 packaging with other members - but unlike MXD1813/MXD1818, it lacks manual-reset debounce circuitry and push-button detection capability.

Key Specifications

Pinout & Package

MXD1815XR22 is housed in a 3-pin SC70 package (outline X3-2, land pattern 90-0208), measuring 2.0mm × 2.1mm × 0.9mm, with gull-wing leads and RoHS-compliant lead-free finish.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX809TRD3-T and TPS3808G12QDBVRQ1, MXD1815XR22 offers a precise 2.18V threshold tailored for 2.5V/3.3V rails, integrated pullup for simplified layout, and guaranteed operation down to VCC = +1V - making it optimal for compact, low-power industrial and portable electronics where component count and brownout robustness are critical.

Availability

MXD1815XR22 is available at Aetrix Electronics and suitable for portable medical sensors, industrial PLC I/O modules, smart home hub controllers, and handheld test equipment requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.

Supply support for MXD1815XR22 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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, communications, and consumer applications.

The MXD1815–MXD1818 product line delivers ultra-low-power, precision reset supervision for 2.5V/3.0V/3.3V microprocessor systems - engineered to replace discrete reset circuits with minimal footprint and zero external components.

FAQ

What is the exact reset threshold voltage of the MXD1815XR22 and how stable is it over temperature?

The MXD1815XR22 has a factory-set reset threshold of 2.18V, specified with ±2.5% accuracy over the full operating temperature range of –40°C to +105°C. This stability is achieved through laser-trimmed bandgap references and BiCMOS process design, ensuring consistent brownout detection without recalibration across environmental stress.

Does the MXD1815XR22 support manual reset functionality via an external pushbutton?

No, the MXD1815XR22 does not include manual reset debounce circuitry. That feature is exclusive to the MXD1813 and MXD1818 variants in the same family. The MXD1815XR22 provides only power-supply monitoring and automatic reset assertion - external pushbutton reset would require additional logic or a different variant such as MXD1818XR22.

What package type and dimensions does the MXD1815XR22 use, and is it RoHS-compliant?

The MXD1815XR22 is supplied in a 3-pin SC70 package (outline X3-2), measuring 2.0mm × 2.1mm × 0.9mm with gull-wing leads. It is RoHS-compliant and available in lead(Pb)-free form; ordering suffix "+T" denotes lead-free version, while "-T" indicates standard leaded packaging.

Can the MXD1815XR22 drive a microcontroller reset pin directly without external components?

Yes - the MXD1815XR22 features an open-drain, active-low RESET output with an internal 5.5kΩ pullup resistor to VCC. This allows direct connection to bidirectional μP reset pins (e.g., ARM Cortex-M, PIC, MSP430) without any external pullup, reducing component count and PCB area while maintaining full logic-level compatibility.

How does the MXD1815XR22 behave when VCC drops below 1.0V, and is RESET still valid?

The MXD1815XR22 guarantees correct RESET logic state down to VCC = +1.0V per datasheet specifications. Below +1.0V, the internal circuitry ceases reliable operation; however, the open-drain output will float high due to the internal pullup, and external pull-down may be added if strict VCC = 0V reset validity is required - though this is not supported by MXD1815XR22's design.