Analog Devices Inc./Maxim Integrated DS1811-15+T&R

Overview

DS1811-15+T&R from Maxim Integrated (now Analog Devices) is a 5V microprocessor supervisory circuit with open-drain active-low reset output, 4.13 V nominal VCC trip point, 150 ms reset timeout, and internal 5.5 kΩ pull-up resistor in SOT-23 package. It monitors power supply integrity and ensures reliable processor restart after brownout or power failure in embedded control systems.

For engineers reviewing the DS1811-15+T&R datasheet, DS1811-15+T&R pinout, DS1811-15+T&R application, or DS1811-15+T&R equivalent, key selection criteria include precise 4.00–4.24 V trip window, guaranteed 100–300 ms reset assertion time, -40°C to +85°C operation, open-drain RST compatibility with 3.3 V/5 V logic, and SOT-23 footprint suitability for space-constrained designs.

Technical Context

The DS1811-15+T&R implements a precision temperature-compensated voltage reference and comparator to detect VCC deviations beyond its factory-trimmed 4.13 V threshold. Its internal power-fail detection logic asserts RST immediately upon undervoltage and holds it active for ≥100 ms after VCC returns to tolerance.

It features an open-drain output stage with integrated 5.5 kΩ pull-up resistor, enabling direct interface to microcontroller reset inputs without external components. The device draws only 30–40 µA quiescent current and operates across full industrial temperature range with no external timing capacitors required.

Key Specifications

Pinout & Package

SOT-23-3 surface-mount package with 1.3 mm × 2.9 mm footprint and 0.95 mm height; RoHS-compliant, lead-free termination.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX809TRD2+T and TPS3808G15DBVR, the DS1811-15+T&R uniquely combines factory-trimmed 4.13 V trip accuracy, integrated 5.5 kΩ pull-up, and 150 ms nominal reset hold in a drop-in SOT-23-3 footprint-reducing component count and layout complexity without sacrificing industrial temperature range or reliability.

Availability

DS1811-15+T&R is available at Aetrix Electronics and suitable for industrial automation, smart metering, and network infrastructure applications requiring stable component supply, long-term lifecycle support, and guaranteed parametric consistency across production batches.

Supply support for DS1811-15+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, power integrity, and real-time control.

The DS1811-15+T&R belongs to the EconoReset™ family of supervisory circuits engineered for cost-sensitive, space-constrained microprocessor reset applications in industrial and consumer electronics.

FAQ

What is the exact VCC trip point specification for DS1811-15+T&R?

The DS1811-15+T&R has a guaranteed VCC trip point range of 4.00 V (minimum), 4.13 V (typical), and 4.24 V (maximum) at -40°C to +85°C. This 15% tolerance window is factory-trimmed and temperature-compensated, ensuring consistent 5 V system supervision without external calibration. The "15" in DS1811-15+T&R denotes the ±150 mV tolerance band around the 4.13 V nominal threshold.

Does DS1811-15+T&R require an external pull-up resistor on the RST pin?

No, DS1811-15+T&R integrates a 5.5 kΩ pull-up resistor internally, eliminating the need for an external component. This simplifies design and saves PCB space. The open-drain RST output remains compatible with 3.3 V or 5 V logic inputs, though external pull-up may be added only if interfacing to voltages exceeding 5.5 V or requiring faster rise times.

What is the reset timeout duration of DS1811-15+T&R after VCC returns to tolerance?

The DS1811-15+T&R asserts the RST signal for 100–300 ms after VCC recovers to within its trip window. The typical value is 150 ms, providing sufficient time for power supply stabilization and microprocessor clock startup before releasing reset. This parameter is process- and temperature-stable, not dependent on external capacitors.

Can DS1811-15+T&R operate with supply voltages below 5 V?

Yes, DS1811-15+T&R operates over 1.2 V to 5.5 V supply range. Its internal voltage reference and comparator remain functional down to 1.2 V, enabling use in low-voltage systems such as 3.3 V or 2.5 V microcontrollers. However, the 4.13 V trip point means it is optimized for monitoring 5 V rails; for lower-rail supervision, other variants like DS1811-10 or DS1811-5 should be selected.

Is DS1811-15+T&R pin-compatible with other EconoReset devices in SOT-23 package?

Yes, all DS1811 variants-including DS1811-5, DS1811-10, DS1811-15, and DS1811-20-in SOT-23-3 package share identical pinout (RST/VCC/GND) and footprint. This allows direct substitution based on required trip voltage without PCB redesign. The DS1811-15+T&R specifically provides the 4.13 V threshold option within this pin-compatible family.