Analog Devices Inc./Maxim Integrated DS1816R-5/T&R

Overview

DS1816R-5/T&R from Maxim Integrated (now Analog Devices) is a 3.3V precision voltage-monitoring reset IC with open-drain active-low output, 3.06V trip point (±5%), 150ms reset timeout, and internal 5kΩ pull-up resistor. It monitors VCC in microprocessor systems to assert reset during power failure or brownout, ensuring reliable startup in embedded controllers and industrial logic.

For engineers reviewing the DS1816R-5/T&R datasheet, DS1816R-5/T&R pinout, DS1816R-5/T&R application, or DS1816R-5/T&R equivalent, key selection criteria include trip voltage accuracy (±5%), guaranteed 150ms reset hold time after VCC recovery, open-drain drive capability (10mA sink), -40°C to +85°C operation, and SOT-23/TO-92 package compatibility for space-constrained PCBs.

Technical Context

The DS1816R-5/T&R implements a temperature-compensated bandgap reference and comparator to detect VCC deviations beyond ±5% of nominal 3.3V. Its internal timing circuit ensures RST remains asserted for 100–250ms after VCC returns to tolerance, with typical 150ms hold time independent of supply slew rate.

It features an open-drain RST output with integrated 3.5–7.5kΩ pull-up resistor, eliminating external components in many designs. The device draws only 28–35µA quiescent current and operates across full industrial temperature range without external biasing or calibration.

Key Specifications

Pinout & Package

SOT-23-3 surface-mount package (3.0mm × 1.4mm × 1.1mm) with gull-wing leads; also available in TO-92 through-hole variant. Both packages share identical pin mapping and electrical behavior.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX809RTRG+T and TPS3808G15DBVR, the DS1816R-5/T&R delivers optimal balance of accuracy (±5%), integrated pull-up, and proven industrial reliability in compact SOT-23, making it ideal for cost-sensitive 3.3V microcontroller reset where fixed 150ms hold time suffices.

Availability

DS1816R-5/T&R is available at Aetrix Electronics and suitable for industrial automation, smart metering, and POS terminal designs requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.

Supply support for DS1816R-5/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

Analog Devices (via acquisition of Maxim Integrated) designs high-performance analog, mixed-signal, and power management ICs for precision sensing, signal conditioning, and system-level reliability.

The DS1816R-5/T&R belongs to Maxim's EconoReset family-engineered for cost-effective, single-supply voltage monitoring in microprocessor-based systems where simplicity, small footprint, and guaranteed reset timing are essential.

FAQ

What is the exact VCC trip voltage range for DS1816R-5/T&R?

The DS1816R-5/T&R has a guaranteed VCC trip point of 2.98V to 3.15V at +25°C, corresponding to ±5% tolerance around its nominal 3.06V threshold. This range is maintained across the full -40°C to +85°C operating temperature range due to internal temperature compensation, ensuring consistent brownout detection in varying environmental conditions. The DS1816R-5/T&R datasheet specifies these limits under DC Electrical Characteristics.

Does DS1816R-5/T&R require an external pull-up resistor on the RST pin?

No, the DS1816R-5/T&R integrates a 3.5–7.5kΩ internal pull-up resistor on the open-drain RST output, eliminating the need for an external component in most applications. However, if the target microcontroller's reset input requires stronger pull-up (e.g., >10mA sink capability or faster rise time), a 10kΩ external resistor may be added in parallel per Note 3 of the DS1816R-5/T&R datasheet. The DS1816R-5/T&R functions reliably with its internal pull-up in standard 3.3V logic interfaces.

How long does DS1816R-5/T&R hold the reset signal active after VCC recovers?

The DS1816R-5/T&R holds the RST signal active for 100–250ms after VCC returns to within tolerance, with a typical value of 150ms. This fixed timeout is generated by an internal RC timer and is independent of VCC slew rate or magnitude, ensuring consistent processor stabilization time across varying power supply characteristics. The DS1816R-5/T&R specification defines this parameter as tRST and tRPU in AC Electrical Characteristics.

Can DS1816R-5/T&R monitor voltages other than 3.3V?

The DS1816R-5/T&R is factory-trimmed specifically for 3.3V systems with a 3.06V ±5% trip point and is not adjustable. It cannot monitor 5V, 2.5V, or other rails without external resistor dividers-which would compromise accuracy and temperature stability. For non-3.3V applications, select the appropriate variant (e.g., DS1816R-10 for 2.88V trip) or a programmable supervisor like the DS1832. The DS1816R-5/T&R is optimized exclusively for 3.3V microprocessor reset.

What package options are available for DS1816R-5/T&R?

The DS1816R-5/T&R is supplied in SOT-23-3 package (tape-and-reel, "T&R" designation), measuring 3.0mm × 1.4mm × 1.1mm with gull-wing leads. A TO-92 through-hole variant exists for the same part number family but is not the "R-5/T&R" ordering option. The DS1816R-5/T&R marking "R" indicates SOT-23, and "T&R" confirms tape-and-reel packaging-compatible with automated SMT assembly and meeting JEDEC standard MO-178AB.