Analog Devices Inc./Maxim Integrated DS1813R-15-U

Overview

DS1813R-15-U from Maxim Integrated is a precision voltage-monitoring reset IC with pushbutton reset capability, designed for microprocessor power-supply supervision. It asserts an active-low reset signal when VCC falls below 4.00V (min), holds reset for 150ms (typ) after power recovery, and responds to manual button press with 1µs detection threshold and 150ms (typ) reset pulse width - used in embedded controllers requiring reliable cold-start and user-initiated reset.

For engineers reviewing the DS1813R-15-U datasheet, DS1813R-15-U pinout, DS1813R-15-U application, or DS1813R-15-U equivalent, key selection criteria include its 4.13V typical trip point, open-drain RST output with internal 5.5kΩ pullup, -40°C to +85°C operation, SOT-23 package compatibility, and dual-trigger reset logic (power-fail + pushbutton).

Technical Context

The DS1813R-15-U integrates a precision temperature-compensated voltage reference and comparator to detect VCC deviations against a fixed 4.00–4.24V trip window. Its reset assertion path includes <2µs propagation delay (tRPD) and supports both power-up stabilization (tRPU = 150ms typ) and power-down fail-safe signaling (tRST = 150ms typ).

Pushbutton functionality operates independently of power monitoring: pulling RST low for ≥1µs triggers a clean 150ms (typ) reset pulse upon release, enabled by internal timing circuitry - no external capacitor required. The open-drain output drives loads up to 10mA (IOL) at 0.4V.

Key Specifications

Pinout & Package

SOT-23-3 surface-mount package (3-pin, 1.3mm × 2.9mm footprint), RoHS-compliant, with exposed pad option per Maxim mechanical drawings.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX809TRD3-T and TPS3808G15DBVR, the DS1813R-15-U uniquely combines fixed 4.13V supervision, integrated pushbutton reset, and ultra-low 35µA supply current in a 3-pin SOT-23 - eliminating both external components and firmware-level reset handling.

Availability

DS1813R-15-U is available at Aetrix Electronics and suitable for industrial PLC controllers, smart metering modules, medical handheld diagnostics, and automotive body control units requiring stable component supply and long-term lifecycle support.

Supply support for DS1813R-15-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) designs high-performance analog and mixed-signal ICs for industrial, communications, and computing applications.

The DS1813R-15-U belongs to Maxim's EconoReset™ family - engineered for cost-sensitive, space-constrained microprocessor supervision where reliability, simplicity, and dual-trigger reset are essential.

FAQ

What is the exact VCC trip voltage range for DS1813R-15-U?

The DS1813R-15-U has a guaranteed VCC trip point of 4.00V (min) to 4.24V (max), with a typical value of 4.13V. This 15% tolerance band (denoted by "-15" in the part number) is factory-trimmed and temperature-compensated - ensuring consistent reset behavior across -40°C to +85°C without external calibration. DS1813R-15-U meets this specification under all recommended operating conditions.

Does DS1813R-15-U require an external pullup resistor on the RST pin?

No, DS1813R-15-U includes an internal 5.5kΩ (typ) pullup resistor on the open-drain RST output. This eliminates the need for an external component in standard 5V systems. An external pullup may be added only if interfacing with higher-voltage logic (e.g., 12V) or requiring faster rise times - but DS1813R-15-U functions fully without it.

How does the pushbutton reset function work on DS1813R-15-U?

The DS1813R-15-U monitors the RST pin directly: pulling it low for ≥1µs triggers a reset event, and the output remains low for 150ms (typ) after release. This is handled entirely within the IC - no microcontroller GPIO or software debounce is needed. DS1813R-15-U treats pushbutton and power-fail resets as independent events with identical timing behavior.

Can DS1813R-15-U operate with supply voltages below 3.0V?

Yes, DS1813R-15-U is specified to operate from VCC = 1.2V to 5.5V. However, its 4.00–4.24V trip point means it will assert reset continuously below ~4.0V - making it unsuitable as a supervisor for sub-4V rails. It can be powered from lower rails only if used solely for pushbutton reset (with VCC externally held >4.0V), but DS1813R-15-U's primary function assumes VCC ≥4.3V nominal.

What package options are available for DS1813R-15-U?

DS1813R-15-U is offered in the SOT-23-3 surface-mount package (marked "R" suffix), as indicated by the "-R" in the part number. The TO-92 through-hole variant exists in the family (e.g., DS1813-15) but DS1813R-15-U specifically denotes the SOT-23 version - verified by Maxim's official marking codes and packaging documentation.