Analog Devices Inc./Maxim Integrated DS1816R-10-U+

Overview

DS1816R-10-U+ from Maxim Integrated (now Analog Devices) is a precision voltage-monitoring reset IC with open-drain active-low output, 10% VCC trip tolerance, and guaranteed 150ms reset pulse width. It monitors 3V–5.5V supplies, features internal 5kΩ pull-up, operates from –40°C to +85°C, and is used in microprocessor supervision for power-fail detection and power-up stabilization.

For engineers reviewing the DS1816R-10-U+ datasheet, DS1816R-10-U+ pinout, DS1816R-10-U+ application, or DS1816R-10-U+ equivalent, key selection criteria include trip point accuracy (2.80V–2.97V), reset timeout consistency (100–250ms), open-drain drive capability (10mA sink), internal pull-up value (3.5–7.5kΩ), and TO-92/SOT-23 package compatibility.

Technical Context

The DS1816R-10-U+ uses an on-chip temperature-compensated voltage reference and comparator to detect VCC deviations beyond ±10%. When out-of-tolerance, it asserts RST low immediately; upon recovery, it holds RST active for ≥100ms (typ. 150ms) before release.

Its open-drain output supports wired-OR configurations and interfaces directly with microcontroller reset inputs requiring active-low assertion. The internal 5kΩ pull-up eliminates external components in many designs, while the 10pF output capacitance ensures clean signal edges under typical PCB loading.

Key Specifications

Pinout & Package

DS1816R-10-U+ is available in both TO-92 and SOT-23 packages. Both variants share identical 3-pin configuration and functional pin mapping.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar voltage-monitoring reset applications.

Compared with MAX6326–33D2T+, DS1816R-10-U+ offers wider trip tolerance ideal for cost-sensitive 3V systems; compared with TPS3808G12DBVR, it delivers lower BOM count and simpler layout at the expense of adjustable threshold flexibility.

Availability

DS1816R-10-U+ is available at Aetrix Electronics and suitable for industrial control, medical handheld devices, automotive body electronics, and smart metering applications requiring stable component supply and long-term manufacturability.

Supply support for DS1816R-10-U+ 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

Analog Devices (via acquisition of Maxim Integrated) designs precision analog, mixed-signal, and power management ICs for industrial, automotive, and healthcare applications.

The DS1816R-10-U+ belongs to Maxim's EconoReset family-engineered for cost-effective, single-supply microprocessor supervision with minimal external components and guaranteed reset timing.

FAQ

What is the exact VCC trip voltage range for DS1816R-10-U+?

The DS1816R-10-U+ has a guaranteed VCC trip point between 2.80V (minimum) and 2.97V (maximum) at –40°C to +85°C, corresponding to its ±10% tolerance specification for nominal 3V operation. This range is validated across temperature and supply conditions per Maxim's DS1816 datasheet Rev. 5, page 4. DS1816R-10-U+ does not support user adjustment or trimming of this threshold.

Does DS1816R-10-U+ require an external pull-up resistor on the RST pin?

No-DS1816R-10-U+ integrates a 3.5–7.5kΩ internal pull-up resistor on the open-drain RST output. An external pull-up is only needed if the target microcontroller reset input requires stronger drive (e.g., >10mA sink) or faster rise time than the internal resistor provides. DS1816R-10-U+'s internal pull-up suffices for most 3.3V/5V CMOS reset inputs.

How long is the reset pulse duration of DS1816R-10-U+ after power recovery?

DS1816R-10-U+ holds the RST pin active low for 100–250ms after VCC returns to within tolerance, with a typical value of 150ms. This timing is internally generated and independent of external components. It ensures adequate stabilization of both the power supply and attached microprocessor before release-critical for reliable boot sequences. DS1816R-10-U+ does not offer programmable timeout.

Can DS1816R-10-U+ be used with a 5V supply?

Yes-DS1816R-10-U+ operates over a VCC range of 0V to 5.5V and monitors the applied supply directly. Its 2.80–2.97V trip point makes it appropriate for 3V systems, but it remains functional as a supervisor on 5V rails where a 3V auxiliary domain is present. DS1816R-10-U+ does not monitor 5V directly for reset assertion unless configured with external resistor scaling (not supported natively).

What package options are available for DS1816R-10-U+?

DS1816R-10-U+ is offered in both TO-92 (3-lead through-hole) and SOT-23 (3-lead surface-mount) packages, with identical pinout (RST–VCC–GND). The "U+" suffix denotes the SOT-23 variant per Maxim's marking convention. Both packages share identical electrical specifications, thermal ratings (–40°C to +85°C), and functional behavior. DS1816R-10-U+ is not available in SOIC, MSOP, or other footprints.