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 -40°C to +85°C operation - used for reliable microprocessor power-on reset in embedded control systems.

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 factors include VCC trip accuracy (2.98–3.15V), internal 5kΩ pull-up resistor, guaranteed 100–250ms reset assertion time, and SOT-23/TO-92 package compatibility with space-constrained PCB layouts.

Technical Context

The DS1816R-5+T&R integrates a temperature-compensated voltage reference and comparator to detect VCC out-of-tolerance conditions. It asserts RST low on power failure and holds it active for ≥100ms after VCC returns to spec, ensuring processor stabilization.

Its open-drain output supports flexible interface logic levels via external or internal pull-up (5kΩ typical), and its trip point is factory-trimmed to 3.06V ±5% - optimized for 3.3V systems requiring tight supply monitoring without external resistors.

Key Specifications

Pinout & Package

SOT-23-3 and TO-92 packages both provide identical pin mapping: Pin 1 = RST (active-low open-drain reset output), Pin 2 = VCC (power supply input), Pin 3 = GND (ground reference).

Key Features

Applications

Equivalent & Alternatives

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

Compared with DS1816R-5+T&R, MAX6326UT31D+ offers tighter trip accuracy but adds BOM complexity, while TPS3808G33DBVR reduces power and simplifies drive but lacks open-drain flexibility for level-shifting or wired-OR configurations.

Availability

DS1816R-5+T&R is available at Aetrix Electronics and suitable for industrial automation, smart metering, and point-of-sale terminal designs requiring stable component supply and long-term lifecycle support.

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

Maxim Integrated, now part of Analog Devices, designs precision analog and mixed-signal ICs for industrial, automotive, and communications applications.

The DS1816R-5+T&R belongs to the EconoReset™ family - engineered for cost-sensitive, space-constrained embedded systems needing reliable, single-chip power monitoring and reset generation without external components.

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 between 2.98V and 3.15V at -40°C to +85°C, corresponding to a nominal 3.06V threshold with ±5% tolerance. This range is factory-trimmed and specified in the DC Electrical Characteristics table of the official datasheet, and applies directly to the DS1816R-5+T&R variant.

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

No - DS1816R-5+T&R includes an internal pull-up resistor of 3.5–7.5kΩ, making external pull-up optional in most 3.3V logic interfaces. However, a 1kΩ external pull-up may be needed if driving high-capacitance loads or interfacing with legacy microprocessors requiring stronger sink current, as noted in the datasheet's Application Example section for DS1816R-5+T&R.

What is the reset timeout duration for DS1816R-5+T&R during power-up recovery?

The DS1816R-5+T&R holds the RST pin active for 100–250ms after VCC returns to within tolerance, with a typical value of 150ms. This guaranteed minimum hold time ensures microprocessor clocks and internal registers stabilize before release, and is explicitly measured per the tRPU parameter in the AC Electrical Characteristics table for DS1816R-5+T&R.

Can DS1816R-5+T&R operate with a 1.8V supply rail?

Yes - DS1816R-5+T&R supports VCC from 0V to 5.5V and maintains functional reset monitoring down to 1.2V, though its 3.06V trip point is optimized for 3.3V systems. When used with 1.8V rails, it will assert reset if VCC drops below 2.98V, which corresponds to a fault condition rather than normal operation; thus DS1816R-5+T&R is not intended as a 1.8V supervisor but remains electrically operational.

Which package types are offered for DS1816R-5+T&R?

DS1816R-5+T&R is supplied in tape-and-reel (T&R) format in the SOT-23-3 package. While the DS1816 family also includes TO-92 variants, the DS1816R-5+T&R designation specifically refers to the SOT-23-3 version - confirmed by Maxim's part marking code "R" indicating SOT-23 packaging and "+T&R" denoting tape-and-reel delivery.