Analog Devices Inc./Maxim Integrated DS1813R-5/T&R

Overview

DS1813R-5/T&R from Maxim Integrated is a precision voltage-monitoring reset IC with pushbutton support, designed for microprocessor power-supply supervision. It asserts an active-low reset signal when VCC falls below 4.62V (typical trip point), holds reset for 150ms (typical) after power recovery, and responds to manual reset via RST pin pull-down. Used in embedded controllers requiring reliable power-on and brownout reset.

For engineers reviewing the DS1813R-5/T&R datasheet, DS1813R-5/T&R pinout, DS1813R-5/T&R application, or DS1813R-5/T&R equivalent, key selection criteria include 4.62V trip threshold, 150ms reset timeout, open-drain output with internal 5.5kΩ pullup, -40°C to +85°C operation, and SOT-23-3 package compatibility.

Technical Context

The DS1813R-5/T&R implements dual-monitoring logic: one path detects VCC out-of-tolerance using a precision temperature-compensated voltage reference (4.62V typical trip), and another detects external pushbutton activity on the RST pin. Both paths drive the same open-drain RST output.

Reset assertion occurs within 5µs of VCC crossing the trip threshold (tRPD), and release is delayed by 150ms (tRST/tRPU) after VCC returns to tolerance or after pushbutton release (tPBRST). The internal 5.5kΩ pullup resistor enables direct interface to microcontroller reset inputs without external components.

Key Specifications

Pinout & Package

SOT-23-3 surface-mount package with 1.3mm × 2.9mm footprint, compatible with automated assembly and space-constrained PCB layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX809TRD1+T and TPS3808G15DBVR, the DS1813R-5/T&R uniquely combines fixed 4.62V trip, integrated pushbutton response, and internal pullup in SOT-23-3-reducing BOM count and enabling compact 5V microcontroller reset solutions without layout redesign.

Availability

DS1813R-5/T&R is available at Aetrix Electronics and suitable for industrial control, smart metering, embedded gateway, and IoT sensor node applications requiring stable component supply and long-term manufacturability.

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

The DS1813R-5/T&R belongs to Maxim's EconoReset family-engineered for cost-sensitive, space-constrained microprocessor supervision with minimal external components and guaranteed reset timing.

FAQ

What is the exact VCC trip voltage for DS1813R-5/T&R?

The DS1813R-5/T&R has a nominal VCC trip point of 4.62V, with a guaranteed range of 4.50V to 4.75V at TA = -40°C to +85°C. This value is factory-trimmed and temperature-compensated, ensuring consistent brownout detection across operating conditions. The "-5" suffix denotes the 5% tolerance grade, and the trip point is specified under DC operating conditions with VCC between 1.2V and 5.5V. DS1813R-5/T&R does not require external calibration.

Does DS1813R-5/T&R require an external pullup resistor on the RST pin?

No, DS1813R-5/T&R integrates a 5.5kΩ internal pullup resistor on the open-drain RST output, eliminating the need for an external component in most standard 5V microcontroller reset interfaces. The internal pullup delivers sufficient VOH (>0.7×VCC) under typical load conditions. DS1813R-5/T&R may require an external pullup only in cases of heavy capacitive loading (>100pF) or when interfacing with high-threshold logic families.

How does DS1813R-5/T&R handle pushbutton reset events?

DS1813R-5/T&R detects any low pulse ≥1µs on the RST pin-even while not in a power-fail state-and asserts an active-low reset for 150ms (typical) after the button is released. This behavior is independent of VCC status and uses the same timing circuitry as power-up reset. DS1813R-5/T&R thus provides true manual override capability without additional debounce circuitry or controller intervention.

What package type is used for DS1813R-5/T&R?

DS1813R-5/T&R is supplied in the SOT-23-3 surface-mount package, with pin 1 (RST), pin 2 (VCC), and pin 3 (GND) in standard top-view orientation. The "R" in the part number explicitly denotes the SOT-23 variant, distinguishing it from the TO-92 version (e.g., DS1813R-5). DS1813R-5/T&R meets JEDEC MO-178 standards and supports reflow soldering per IPC/JEDEC J-STD-020.

Is DS1813R-5/T&R suitable for automotive applications?

No, DS1813R-5/T&R is rated for -40°C to +85°C operation and is not qualified to AEC-Q100 or automotive reliability standards. Its design targets industrial and commercial embedded systems-not under-hood automotive environments. For automotive-grade reset supervision, consider devices such as the TLV803 or MAX6375 series. DS1813R-5/T&R remains appropriate for automotive infotainment or telematics modules operating within its specified temperature range.