Analog Devices Inc./Maxim Integrated MXD1815XR22+

Overview

MXD1815XR22+ from Maxim Integrated is a low-power microprocessor reset supervisor IC designed to monitor +2.5V/+3.0V/+3.3V supply rails and assert an active-low push-pull RESET signal when VCC falls below 2.18V. It guarantees valid reset output down to VCC = +1V, features ±2.5% threshold accuracy over temperature, and delivers a fixed 100ms minimum reset timeout period. It is used in portable battery-powered equipment requiring reliable power-on reset and brownout protection.

For engineers reviewing the MXD1815XR22+ datasheet, MXD1815XR22+ pinout, MXD1815XR22+ application, or MXD1815XR22+ equivalent, key selection criteria include its 2.18V factory-set reset threshold, SC70-3 package, 4µA typical supply current at +3.6V, push-pull active-low output configuration, and guaranteed operation from –40°C to +105°C.

Technical Context

The MXD1815XR22+ implements a precision bandgap-based voltage comparator with hysteresis to detect VCC drops below its factory-trimmed 2.18V threshold (±2.5% over –40°C to +105°C). An internal timer ensures RESET remains asserted for ≥100ms after VCC recovers above threshold, preventing premature processor release during unstable power-up.

Unlike open-drain variants, this device uses a push-pull output stage capable of sourcing 350µA and sinking 10mA, eliminating external pull-up components. Its BiCMOS process enables 4µA typical ICC at +3.6V while maintaining immunity to fast transients - it ignores VCC glitches shorter than ~1–2µs depending on overdrive magnitude.

Key Specifications

Pinout & Package

The MXD1815XR22+ is housed in a 3-pin SC70 package (outline X3-2), measuring 2.0mm × 2.1mm × 0.9mm with 0.65mm lead pitch. It is RoHS-compliant and lead(Pb)-free (denoted by "+" suffix).

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, the MXD1815XR22+ offers the lowest factory-set threshold (2.18V) in SC70 packaging with push-pull drive - making it optimal for tight-margin 2.5V/3.0V systems where board space and component count are critical.

Availability

MXD1815XR22+ is available at Aetrix Electronics and suitable for portable instrumentation, industrial controllers, and set-top box designs requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

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 MXD1815XR22+ belongs to the MXD1810–MXD1818 family of ultra-low-power μP reset supervisors - engineered specifically for space-constrained, battery-sensitive applications requiring precise, glitch-immune power monitoring.

FAQ

What is the exact reset threshold voltage of the MXD1815XR22+?

The MXD1815XR22+ has a factory-set reset threshold of 2.18V, with guaranteed tolerance of ±2.5% over the full operating temperature range (–40°C to +105°C). This value is confirmed in the Reset Threshold Table and Electrical Characteristics section of the official datasheet, and applies specifically to the "R22" suffix variant within the MXD1815–MXD1818 subfamily.

Does the MXD1815XR22+ support manual reset functionality?

No, the MXD1815XR22+ does not include manual reset detection. That feature is exclusive to the MXD1813 and MXD1818 variants (e.g., MXD1818XR22+), which incorporate debounced push-button reset logic requiring a >1.5µs low pulse on the RESET pin. The MXD1815XR22+ is a dedicated power-supply monitor with automatic reset only.

What package type and dimensions does the MXD1815XR22+ use?

The MXD1815XR22+ is supplied in a 3-pin SC70 package (outline X3-2), measuring 2.0mm × 2.1mm × 0.9mm with 0.65mm lead pitch. Its top marking is "AIB", per the Device Marking Codes table, and it is lead(Pb)-free, indicated by the "+" suffix in the part number.

Can the MXD1815XR22+ operate reliably at VCC = +1.2V?

Yes - the MXD1815XR22+ is guaranteed to provide correct RESET/RESET logic states down to VCC = +1.0V, as specified in Absolute Maximum Ratings and Electrical Characteristics. At +1.2V, it maintains full reset comparator functionality and valid push-pull output drive, making it suitable for ultra-low-voltage brownout detection in energy-harvesting and deep-sleep systems.

Is the MXD1815XR22+ pin-compatible with other reset ICs like the DS181x series?

Yes, the MXD1815XR22+ is explicitly stated to be pin-compatible with DS181_ products in SOT23 packages. While the MXD1815XR22+ uses SC70, its pinout (RESET–VCC–GND) matches DS181x functional equivalents, enabling direct layout reuse when migrating from SOT23 to SC70 for size reduction - provided trace impedance and thermal constraints are verified.