Analog Devices Inc./Maxim Integrated DS1813R-10/T&R

Overview

DS1813R-10/T&R from Maxim Integrated is a precision voltage-monitoring reset IC with pushbutton reset capability, designed for microprocessor supervision in 5V systems. It features a 4.25V to 4.49V VCC trip point (±10% tolerance), 150ms reset timeout, open-drain RST output with internal 5.5kΩ pullup, and operates from -40°C to +85°C in SOT-23 package.

For engineers reviewing the DS1813R-10/T&R datasheet, DS1813R-10/T&R pinout, DS1813R-10/T&R application, or DS1813R-10/T&R equivalent, key selection criteria include reset threshold accuracy, pushbutton debouncing behavior, supply current (<40µA), open-drain drive strength (10mA sink), and compatibility with 5V microcontroller reset inputs.

Technical Context

The DS1813R-10/T&R implements dual-monitoring logic: one path detects VCC falling below 4.35V (typical) to assert active-low reset, while a second path senses manual RST line pull-down for pushbutton-initiated reset. Both paths enforce a fixed 150ms (typical) reset pulse width after release or power recovery.

Its internal temperature-compensated voltage reference ensures stable trip-point performance across -40°C to +85°C. The open-drain output with integrated 5.5kΩ pullup resistor eliminates external components for standard 5V logic-level reset signaling to microcontrollers.

Key Specifications

Pinout & Package

SOT-23 surface-mount package (3-pin, 1.3mm × 2.9mm footprint), RoHS-compliant, tape-and-reel format (T&R).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX809TRD2+T and TPS3808G15DBVR, the DS1813R-10/T&R uniquely combines factory-trimmed 5V-compatible reset threshold, integrated pushbutton sensing, and ultra-low ICC in a 3-pin SOT-23-making it optimal for cost-sensitive, space-constrained 5V microcontroller reset supervision where manual recovery is mandatory.

Availability

DS1813R-10/T&R is available at Aetrix Electronics and suitable for industrial control panels, point-of-sale terminals, smart meters, and network infrastructure equipment requiring stable component supply and long-term manufacturability.

Supply support for DS1813R-10/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, mixed-signal, and power management ICs for industrial, communications, and computing applications.

The DS1813R-10/T&R belongs to Maxim's EconoReset family-engineered to replace discrete reset circuits with single-chip solutions offering guaranteed reset timing, voltage accuracy, and pushbutton integration for 5V microprocessor systems.

FAQ

What is the exact VCC trip point range for DS1813R-10/T&R?

The DS1813R-10/T&R has a guaranteed VCC trip point range of 4.25V (minimum) to 4.49V (maximum), corresponding to its ±10% tolerance grade. This range is factory-trimmed and tested across temperature, ensuring consistent 5V system supervision without external calibration. The typical value is 4.35V, and the specification applies under recommended operating conditions (TA = –40°C to +85°C, VCC = 1.2V to 5.5V). DS1813R-10/T&R does not require external resistors to set this threshold.

Does DS1813R-10/T&R require an external pullup resistor on the RST pin?

No, DS1813R-10/T&R includes an internal pullup resistor of 3.5kΩ to 7.5kΩ (typical 5.5kΩ) connected between VCC and the open-drain RST output. This eliminates the need for an external pullup in standard 5V applications. The internal resistor ensures proper logic-high level when RST is not asserted, simplifying board layout and reducing BOM count. DS1813R-10/T&R functions correctly with only VCC, GND, and RST connections.

How does DS1813R-10/T&R handle pushbutton reset timing?

DS1813R-10/T&R detects any RST pin low pulse ≥1µs and responds by holding RST low for 100–300ms (typically 150ms) after the button is released. This timing is internally generated and independent of VCC stability, enabling reliable manual reset even during marginal supply conditions. The DS1813R-10/T&R does not require external RC networks or debouncing circuitry-the timing is fixed and factory-characterized.

What is the maximum supply voltage rating for DS1813R-10/T&R?

The absolute maximum VCC rating for DS1813R-10/T&R is +7.0V, with a recommended operating range of 0V to 5.5V. Operation above 5.5V may cause excessive current draw or reliability degradation, though short-duration transients up to +7.0V are tolerated per absolute maximum ratings. DS1813R-10/T&R is specifically optimized for 5V systems and should not be used in 12V or higher rails without external regulation.

Is DS1813R-10/T&R compatible with 3.3V microcontrollers?

Yes, DS1813R-10/T&R is compatible with 3.3V microcontrollers because its RST output is open-drain and referenced to the host system's logic level. When interfaced with a 3.3V MCU, the RST pin pulls low to <0.4V (guaranteed) and relies on the MCU's internal or external 3.3V pullup. DS1813R-10/T&R's VCC can be supplied from the same 3.3V rail (within 1.2V–5.5V range), but its 4.25–4.49V trip point means it will only supervise 5V supplies-not 3.3V rails.