Analog Devices Inc./Maxim Integrated MXD1810XR44+

Overview

MXD1810XR44+ from Maxim Integrated is a precision 5V-system microprocessor reset supervisor IC in SC70-3 package, featuring active-low open-drain RESET output, factory-set 4.37V reset threshold (±2.5% over temperature), 100ms minimum reset timeout, and guaranteed operation down to VCC = +1V. It monitors power supply integrity during power-up, brownout, and power-down in embedded controllers and portable equipment.

For engineers reviewing the MXD1810XR44+ datasheet, MXD1810XR44+ pinout, MXD1810XR44+ application, or MXD1810XR44+ equivalent, key selection factors include its 4.37V threshold accuracy, 4μA supply current, SC70 footprint compatibility, manual-reset debounce capability (not applicable to this variant), and open-drain interface suitability for bidirectional μP reset pins.

Technical Context

This device implements a precision bandgap-based voltage comparator with internal hysteresis and a monostable timer to generate a clean, glitch-immune reset signal. The comparator continuously monitors VCC against a trimmed 4.37V reference, asserting RESET when VCC falls below threshold and holding it low for ≥100ms after VCC recovers.

As an open-drain output device, MXD1810XR44+ includes a 5.5kΩ internal pullup resistor to VCC and supports sink currents up to 10mA at 0.4V, enabling direct interfacing with microcontrollers requiring active-low reset assertion without external components.

Key Specifications

Pinout & Package

MXD1810XR44+ is housed in a 3-pin SC70 package (outline X3-2), measuring 2.0mm × 1.25mm × 0.9mm, rated for -40°C to +105°C operation and RoHS-compliant (lead-free).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MXD1810XR44+, MAX809TRD3+T offers lower current but demands external pullup and misses the precise 4.37V threshold, while TPS3808G33DBVR targets different voltage domains and adds complexity-neither provides drop-in replacement capability.

Availability

MXD1810XR44+ is available at Aetrix Electronics and suitable for industrial controllers, portable medical devices, set-top boxes, and network edge routers requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for MXD1810XR44+ 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 MXD1810–MXD1818 family was designed specifically for low-power, space-constrained microprocessor reset supervision in 5V and 3.3V systems, emphasizing precision threshold accuracy, minimal external components, and wide temperature operation.

FAQ

What is the exact reset threshold voltage of MXD1810XR44+ and how stable is it over temperature?

The MXD1810XR44+ has a factory-set reset threshold of 4.37V with ±2.5% accuracy guaranteed over the full -40°C to +105°C operating range. This specification is validated by design and production-tested at +25°C, with temperature drift characterized in the normalized threshold vs. temperature plot (toc03). The device uses a precision bandgap reference and laser-trimmed resistors to maintain stability across thermal extremes, making it suitable for industrial environments where supply rails may vary with ambient conditions.

Does MXD1810XR44+ support manual reset functionality via the RESET pin?

No, MXD1810XR44+ does not include manual reset debounce capability. That feature is exclusive to the MXD1813 and MXD1818 variants (e.g., MXD1813XR44+). The MXD1810XR44+ RESET pin is strictly an open-drain output - it cannot accept external low-going signals to trigger reset. Its function is solely to assert reset when VCC drops below 4.37V, and it remains asserted for ≥100ms after VCC recovers.

Can MXD1810XR44+ be used in 3.3V systems?

No, MXD1810XR44+ is specified for 5V systems only. Its 4.37V reset threshold is optimized to detect brownout in +5V rails (e.g., when VCC drops from 5.0V to <4.37V). Using it in a 3.3V system would cause immediate, permanent reset assertion since VCC never reaches the threshold. For 3.3V applications, select MXD1815XRxx+ or MXD1816XRxx+ variants with thresholds like 3.06V (R31) or 2.88V (R29).

What is the maximum sink current capability of the MXD1810XR44+ RESET output?

The MXD1810XR44+ RESET output can sink up to 10mA while maintaining ≤0.4V at the pin, tested under conditions of VCC ≥ 2.7V. This is sufficient to drive standard CMOS inputs and small LED indicators directly. The internal 5.5kΩ pullup resistor ensures proper high-state biasing when not asserted, eliminating the need for external components in most microcontroller interface scenarios.

Is MXD1810XR44+ pin-compatible with other devices in the MXD181x family?

Yes, all MXD181x devices-including MXD1810XR44+-share identical 3-pin SC70 pinouts (RESET, VCC, GND) and mechanical footprints. However, electrical behavior differs significantly: MXD1810XR44+ is open-drain active-low, while MXD1812XR44+ is push-pull active-high, and MXD1813XR44+ adds manual reset detection. Swapping variants requires verifying output polarity, threshold voltage, and feature set-not just pin alignment.