Analog Devices Inc./Maxim Integrated MXD1815UR23

Overview

MXD1815UR23 from Maxim Integrated is a precision low-power microprocessor reset circuit designed for +2.5V/+3.0V/+3.3V digital systems. It provides active-low open-drain RESET output with factory-trimmed 2.31V reset threshold (±2.5% over temperature), 100ms minimum reset timeout, and operates from -40°C to +105°C in SOT23-3 package - used to ensure reliable power-on initialization in portable controllers and battery-powered instrumentation.

For engineers reviewing the MXD1815UR23 datasheet, MXD1815UR23 pinout, MXD1815UR23 application, or MXD1815UR23 equivalent, key selection criteria include its 2.31V V_TH, 4μA supply current, internal 5.5kΩ pullup resistor, manual-reset debounce capability (1.5μs detection), and guaranteed RESET validity down to V_CC = +1V.

Technical Context

The MXD1815UR23 implements a precision bandgap-based voltage monitor with hysteresis-free comparator architecture, asserting RESET when V_CC falls below 2.31V and holding it low for ≥100ms after V_CC recovers. Its open-drain output includes an internal 5.5kΩ pullup to V_CC, enabling direct interface with bidirectional μP reset pins without external components.

Unlike push-pull variants, MXD1815UR23 supports shared-bus reset signaling and exhibits transient immunity up to 100µs at 200mV overdrive. It guarantees functional operation down to V_CC = +1V and features ±2.5% reset threshold accuracy across -40°C to +105°C - critical for brownout protection in low-voltage embedded systems.

Key Specifications

Pinout & Package

MXD1815UR23 is housed in a 3-pin SOT23 package (U3-1 outline, 90-0179 land pattern), with 0.95mm pin pitch and gull-wing leads. The package supports reflow soldering per JEDEC J-STD-020 and is available in lead(Pb)-free format (replace "-T" with "+T" in ordering code).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX809TRD3-T and TPS3808G12DBVR, MXD1815UR23 delivers optimal trade-off for 2.5V/3.3V systems needing minimal footprint, zero external parts, and guaranteed 2.31V detection - making it ideal for space-constrained, cost-sensitive, and ultra-low-power embedded designs.

Availability

MXD1815UR23 is available at Aetrix Electronics and suitable for industrial controllers, portable medical devices, smart energy meters, and IoT edge sensors requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for MXD1815UR23 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 analog, mixed-signal, and power-management ICs for industrial, communications, and consumer applications.

The MXD1810–MXD1818 family was engineered specifically for low-power microprocessor supervision in battery-operated and space-constrained systems - emphasizing precision threshold accuracy, minimal quiescent current, and integration of manual reset debounce.

FAQ

What is the exact reset threshold voltage of MXD1815UR23 and how stable is it over temperature?

The MXD1815UR23 has a factory-trimmed reset threshold of 2.31V, with guaranteed accuracy of ±2.5% across the full operating temperature range of -40°C to +105°C. This stability is achieved through laser-trimmed bandgap references and matched comparator design, ensuring consistent brownout detection in varying thermal environments without external calibration.

Does MXD1815UR23 support manual reset functionality, and if so, what are the timing requirements?

Yes, MXD1815UR23 supports debounced manual reset: a low pulse on the RESET pin lasting ≥1.5µs triggers a full 100ms reset timeout period. This feature eliminates external debounce circuitry when interfacing with mechanical pushbuttons, and the internal logic ensures noise immunity without requiring additional filtering components.

Can MXD1815UR23 operate reliably when VCC drops below 2.0V, and what happens to the RESET output in that condition?

Yes, MXD1815UR23 is guaranteed to maintain correct RESET logic state down to V_CC = +1.0V. Below ~1.8V, the open-drain output's sinking capability degrades, but the internal pullup ensures RESET remains high (inactive) until V_CC falls below the functional minimum - preserving system integrity during deep brownout.

Is an external pullup resistor required for MXD1815UR23's RESET output?

No, MXD1815UR23 includes an internal 5.5kΩ pullup resistor to V_CC, eliminating the need for an external component. This simplifies design, reduces PCB area, and ensures compatibility with bidirectional μP reset pins - such as those found on legacy 8-bit microcontrollers - without risk of contention.

What package type and footprint does MXD1815UR23 use, and is lead-free compliance available?

MXD1815UR23 uses the standard 3-pin SOT23 package (U3-1 outline, 90-0179 land pattern) with 0.95mm pin pitch. Lead-free versions are available: specify "+T" instead of "-T" in the ordering code (e.g., MXD1815UR23+T), and all units ship in tape-and-reel format with 2500 units per reel.