Analog Devices Inc./Maxim Integrated MXD1810XR46

Overview

MXD1810XR46 from Maxim Integrated is a low-power microprocessor reset supervisor IC for +5V systems, featuring an active-low open-drain RESET output, factory-set 4.62V reset threshold (±2.5% over temperature), 100ms minimum reset timeout, and internal 5.5kΩ pullup resistor - used to ensure reliable power-on reset in embedded controllers and portable equipment.

For engineers reviewing the MXD1810XR46 datasheet, MXD1810XR46 pinout, MXD1810XR46 application, or MXD1810XR46 equivalent, key selection considerations include its SC70-3 package, VCC monitoring down to +1V, transient immunity, manual-reset compatibility (not supported on this variant), and compatibility with bidirectional μP reset pins without external pullups.

Technical Context

The MXD1810XR46 implements a precision voltage comparator with hysteresis-free threshold detection at 4.62V, asserting RESET when VCC falls below this level and holding it low for ≥100ms after VCC rises above threshold. It operates across -40°C to +105°C and draws only 4μA typical supply current at 3.6V.

This variant belongs to the MXD1810–MXD1813 series for +5V systems and uses open-drain output architecture with integrated pullup - enabling direct interface to bidirectional microcontroller reset pins (e.g., Motorola 68HC11) and eliminating need for external pullup resistors.

Key Specifications

Pinout & Package

MXD1810XR46 is housed in a 3-pin SC70 package (outline X3-2), measuring 2.0mm × 2.1mm × 0.95mm, optimized for space-constrained portable designs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX809TR46D3T, MXD1810XR46 offers open-drain flexibility and lower ICC; versus TPS3808G33DBVR, it delivers guaranteed 4.62V accuracy without external components but lacks adjustability - making it optimal for cost-sensitive, high-volume +5V systems requiring minimal footprint and zero calibration.

Availability

MXD1810XR46 is available at Aetrix Electronics and suitable for computers and controllers, intelligent instruments, and set-top boxes requiring stable component supply, long-term industrial lifecycle support, and RoHS-compliant packaging.

Supply support for MXD1810XR46 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) designs precision analog and mixed-signal ICs for industrial, communications, and consumer applications.

The MXD1810–MXD1813 family targets cost-sensitive, space-constrained +5V microprocessor systems requiring highly reliable, no-component reset supervision with guaranteed operation down to +1V supply.

FAQ

What is the exact reset threshold voltage of MXD1810XR46 and how tightly is it specified?

The MXD1810XR46 has a factory-set reset threshold of 4.62V, with a guaranteed tolerance of ±2.5% over the full operating temperature range (-40°C to +105°C). This value is confirmed in the Electrical Characteristics table under "Reset Threshold (VTH)" for suffix R46, and ensures reliable detection of +5V rail collapse before microprocessor malfunction occurs. The MXD1810XR46 maintains this accuracy without external calibration or trimming components.

Does MXD1810XR46 support manual reset functionality via the RESET pin?

No, MXD1810XR46 does not support manual reset detection. That feature is exclusive to MXD1813/MXD1818 variants (e.g., MXD1813XR46), which include debounced push-button logic requiring a ≥1.5μs low pulse on RESET. The MXD1810XR46 RESET pin is strictly an open-drain output - applying external logic to it may disrupt normal operation. For manual reset capability, select MXD1813XR46 instead.

What package type and dimensions does MXD1810XR46 use, and is it RoHS-compliant?

MXD1810XR46 is supplied in a 3-pin SC70 package (outline X3-2), measuring 2.0mm × 2.1mm × 0.95mm. It is available in both leaded and lead(Pb)-free versions; the "-T" suffix denotes standard leaded packaging, while "+T" indicates RoHS-compliant lead-free. The SC70 footprint is compatible with automated SMT assembly and supports high-density PCB layouts typical in portable electronics.

Can MXD1810XR46 interface directly with a microcontroller that has a bidirectional reset pin?

Yes, MXD1810XR46 can interface directly with bidirectional reset pins (e.g., Motorola 68HC11) because its open-drain RESET output includes a 5.5kΩ internal pullup resistor. This eliminates the need for an external pullup and allows either the MXD1810XR46 or the μC to assert reset - critical for systems where firmware or hardware may initiate reset independently. The MXD1810XR46 datasheet explicitly confirms this capability in the Applications Information section.

What is the minimum supply voltage at which MXD1810XR46 guarantees valid RESET output logic states?

MXD1810XR46 guarantees correct RESET/RESET logic states down to VCC = +1.2V over the full temperature range (-40°C to +105°C), and down to +1.0V at 0°C to +105°C. This is documented in the Absolute Maximum Ratings and Electrical Characteristics tables. The MXD1810XR46 remains functional well into brownout conditions, ensuring deterministic reset behavior even as the +5V rail collapses - a key reliability feature for mission-critical embedded systems.