Analog Devices Inc./Maxim Integrated DS1814AR-10-U

Overview

DS1814AR-10-U from Maxim Integrated is a 5V microprocessor supervisory circuit with power-on reset, watchdog timer, and pushbutton reset functions. It features 10% VCC trip point (4.25–4.50 V), 140 ms minimum reset pulse width, and SOT-23-5 package. It halts and restarts out-of-control microprocessors during power transients or software hangs in embedded control systems.

For engineers reviewing the DS1814AR-10-U datasheet, DS1814AR-10-U pinout, DS1814AR-10-U application, or DS1814AR-10-U equivalent, key selection criteria include VCC trip accuracy, watchdog timeout (1.12 s), reset pulse duration (140–280 ms), push-pull RST output valid down to 1.0 V VCC, and compatibility with MAX823/24/25 series.

Technical Context

The DS1814AR-10-U integrates three core monitoring functions: precision voltage detection (4.25–4.50 V trip), a 1.12 s watchdog timer triggered by ST input transitions, and debounced pushbutton reset via PBRST. Its internal comparator uses temperature-compensated reference for stable threshold behavior across -40°C to +85°C.

It delivers active-low RST output with push-pull drive capable of sourcing 350 µA at 2.4 V and sinking 3.2–6 mA at 0.4 V. The reset remains asserted for ≥140 ms after power-up or power-fail recovery, ensuring processor stabilization before execution resumes.

Key Specifications

Pinout & Package

SOT-23-5 surface-mount package (2.9 mm × 1.6 mm × 1.1 mm), lead-free and RoHS-compliant. Pin 1 marked with dot; pin numbering follows standard SOT-23 convention.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX823SESA+ and TPS3808G12DBVR, the DS1814AR-10-U uniquely integrates power monitoring, watchdog timer, and pushbutton reset in one SOT-23-5 device-reducing BOM count and PCB area while enabling comprehensive system-level fault recovery without external components.

Availability

DS1814AR-10-U is available at Aetrix Electronics and suitable for industrial automation, medical diagnostics, automotive body electronics, and smart metering applications requiring stable component supply and long-term lifecycle support.

Supply support for DS1814AR-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

Maxim Integrated (now part of Analog Devices) is a semiconductor company specializing in analog, mixed-signal, and power management ICs for industrial, communications, and consumer applications.

The DS1814AR-10-U belongs to Maxim's MicroMonitor™ family of supervisory circuits, designed specifically for robust microprocessor reset and reliability assurance in mission-critical embedded systems.

FAQ

What is the exact VCC trip point range for DS1814AR-10-U?

The DS1814AR-10-U has a guaranteed VCC trip point range of 4.25 V to 4.50 V, corresponding to its 10% tolerance specification for 5 V systems. This threshold is set by an internal precision temperature-compensated reference and comparator, ensuring consistent reset assertion across the full industrial temperature range (-40°C to +85°C). The DS1814AR-10-U does not support adjustable or user-programmable trip points.

Does DS1814AR-10-U support both watchdog and pushbutton reset functions simultaneously?

Yes, the DS1814AR-10-U supports both functions concurrently. As a Type 'A' variant, it includes both the ST (strobe) input for watchdog timer operation and the PBRST (pushbutton reset) input. The watchdog monitors ST transitions with a 1.12 s timeout, while PBRST provides debounced manual reset with ≥140 ms pulse width. Both independently assert the RST output, making DS1814AR-10-U suitable for systems requiring dual-fault coverage.

Can DS1814AR-10-U operate reliably below 2.0 V VCC?

Yes, the DS1814AR-10-U maintains valid RST output down to 1.0 V VCC due to its push-pull output architecture. Below 1.0 V, a 100 kΩ pull-down resistor from RST to GND can extend valid reset assertion to 0 V VCC, though this draws leakage current when RST is high. This capability makes DS1814AR-10-U especially valuable in battery-powered or brownout-prone applications where other supervisors may lose reset integrity.

Is DS1814AR-10-U pin-compatible with MAX823 series devices?

Yes, DS1814AR-10-U is explicitly specified as pin- and function-compatible with the MAX823/24/25 family. Pin assignments (RST, GND, PBRST, ST, VCC) match the SOT-23-5 footprint and signal roles. No PCB layout changes are required when substituting DS1814AR-10-U into designs originally using MAX823SESA+, MAX824TESA+, or MAX825TESA+, provided the 10% trip point and integrated PBRST/ST functionality meet system requirements.

What is the maximum recommended VCC slew rate for DS1814AR-10-U during power-up?

The DS1814AR-10-U specifies a minimum VCC slew rate of 12.5 V/s on the rising edge to ensure reliable power-on reset generation. Slower ramp rates may cause premature RST deassertion before the microprocessor's internal regulators and clocks stabilize. For systems with slow-ramping supplies (e.g., large bulk capacitance or weak regulators), adding a small RC network on VCC or selecting a supervisor with longer reset timeout may be necessary - though DS1814AR-10-U's 140–280 ms tRPU accommodates most standard 5 V DC-DC converters.