Analog Devices Inc./Maxim Integrated DS1818-10+T&R

Overview

DS1818-10+T&R from Maxim Integrated is a 3.3V fixed-threshold supervisory IC with pushbutton reset capability, active-low open-drain reset output, 150ms reset timeout, and ±10% VCC trip tolerance. It monitors power supply voltage (VCC), asserts reset on out-of-tolerance conditions, and supports manual reset via external pushbutton - used in microcontroller-based embedded systems requiring reliable power-on and brownout reset.

For engineers reviewing the DS1818-10+T&R datasheet, DS1818-10+T&R pinout, DS1818-10+T&R application, or DS1818-10+T&R equivalent, key selection factors include its 2.80V–2.97V trip range, 35µA max quiescent current, 150ms reset hold time, SOT-23/TO-92 package options, and integrated 5.5kΩ internal pullup resistor enabling space-efficient reset circuitry.

Technical Context

The DS1818-10+T&R implements a precision temperature-compensated voltage reference and comparator to detect VCC deviations beyond its ±10% threshold (2.80V–2.97V at 3.3V nominal). Its internal power-fail logic forces RST low during undervoltage and holds it active for 100–250ms after recovery to ensure processor stabilization.

It supports dual reset initiation modes: automatic power-monitoring reset and manual pushbutton reset - where pulling RST low for ≥1µs triggers a 100–250ms reset pulse upon release. The open-drain output with internal 3.5–7.5kΩ pullup eliminates need for external biasing in many MCU interface configurations.

Key Specifications

Pinout & Package

DS1818-10+T&R is supplied in SOT-23 package (3-pin, surface-mount) and TO-92 (3-pin, through-hole); both share identical pin mapping.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX809TRD2+T and TPS3808G12QDBVRQ1, DS1818-10+T&R uniquely combines pushbutton reset, ±10% trip tolerance, and integrated pullup in a 3-pin SOT-23 - reducing component count and simplifying manual recovery in industrial embedded systems without requiring automotive qualification or precision voltage thresholds.

Availability

DS1818-10+T&R is available at Aetrix Electronics and suitable for industrial control panels, smart metering modules, and IoT sensor nodes requiring stable component supply, long-term lifecycle support, and consistent reset behavior across temperature and voltage variation.

Supply support for DS1818-10+T&R 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, mixed-signal, and power management ICs for industrial, communications, computing, and consumer applications.

The DS1818-10+T&R belongs to Maxim's EconoReset™ family of supervisory circuits, engineered specifically for cost-sensitive, space-constrained embedded systems needing reliable power-on and brownout reset with minimal external components.

FAQ

What is the exact VCC trip voltage range for DS1818-10+T&R?

The DS1818-10+T&R has a guaranteed VCC trip threshold range of 2.80V to 2.97V at 25°C, corresponding to ±10% tolerance around a nominal 3.3V supply. This range is specified in the DC Electrical Characteristics table and remains stable across the full −40°C to +85°C operating temperature range due to internal temperature compensation. DS1818-10+T&R maintains this accuracy without external calibration.

Does DS1818-10+T&R require an external pullup resistor on the RST pin?

No, DS1818-10+T&R includes an internal pullup resistor ranging from 3.5kΩ to 7.5kΩ, eliminating the need for an external pullup in most standard microcontroller reset interfaces. An external pullup may be added only if the load demands exceed the internal resistor's current-sinking capability - for example, when driving multiple parallel reset inputs or long PCB traces with high capacitance. DS1818-10+T&R's design minimizes BOM count by integrating this function.

How does the pushbutton reset function work on DS1818-10+T&R?

DS1818-10+T&R monitors the RST pin for low pulses: pulling RST below 0.4V for ≥1µs triggers a manual reset, and the output remains active low for 100–250ms after release. This eliminates need for external debounce circuitry. The feature works independently of power-monitoring reset and is fully functional across the entire operating voltage range (1.0V–5.5V). DS1818-10+T&R integrates this capability without additional pins or configuration.

What package types are offered for DS1818-10+T&R?

DS1818-10+T&R is available in both SOT-23 (surface-mount, 3-pin) and TO-92 (through-hole, 3-pin) packages, with identical pinout (RST–VCC–GND) and electrical specifications. The "+T&R" suffix indicates tape-and-reel packaging for automated SMT assembly. Both packages support the same −40°C to +85°C operating range and share mechanical drawings published by Maxim Integrated.

Is DS1818-10+T&R pin-compatible with other DS1818 variants like DS1818-5 or DS1818-20?

Yes, all DS1818 variants - including DS1818-5, DS1818-10+T&R, and DS1818-20 - share identical pinout, package dimensions, and interface behavior; only the VCC trip threshold differs (±5%, ±10%, ±20%). No PCB layout changes are required when substituting between them. DS1818-10+T&R can be dropped into designs originally specifying DS1818-5 or DS1818-20, provided the system's voltage tolerance requirements align with its 2.80V–2.97V trip window.