Analog Devices Inc./Maxim Integrated DS1813-5/T&R

Overview

DS1813-5/T&R from Maxim Integrated is a 5V precision voltage-monitoring reset IC with pushbutton reset capability, featuring a 4.62V typical VCC trip point, 150ms reset timeout, open-drain RST output with internal 5.5kΩ pullup, and operation from -40°C to +85°C. It serves as a system supervisor in microprocessor-based power-up/power-down sequencing for embedded controllers.

For engineers reviewing the DS1813-5/T&R datasheet, DS1813-5/T&R pinout, DS1813-5/T&R application, or DS1813-5/T&R equivalent, key selection criteria include trip voltage tolerance (±5%), reset timing consistency, pushbutton debouncing behavior, and compatibility with 5V logic-level microcontrollers requiring reliable brown-out detection.

Technical Context

The DS1813-5/T&R implements dual-monitoring functionality: precision bandgap-referenced voltage detection for VCC supervision and edge-triggered pushbutton sensing on the RST pin. Its comparator uses temperature-compensated circuitry to maintain stable trip thresholds across the full operating range.

Reset assertion is active-low and open-drain, enabling wired-OR configurations and compatibility with diverse processor reset inputs. The internal 5.5kΩ pullup resistor eliminates external components while supporting standard 5V logic levels and 10mA sink capability at 0.4V.

Key Specifications

Pinout & Package

SOT-23 surface-mount package (3-pin, 1.3mm × 2.9mm footprint) with TO-92 through-hole variant also supported; both share identical pin mapping and electrical behavior.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX809SEUR+T and TPS3808G15DBVR, the DS1813-5/T&R uniquely integrates pushbutton sensing and internal pullup in a fixed 150ms reset window-reducing component count and simplifying design where manual reset and minimal footprint are priorities.

Availability

DS1813-5/T&R is available at Aetrix Electronics and suitable for industrial PLC controllers, smart meter power sequencing, embedded HVAC systems, and point-of-sale terminals requiring stable component supply and long-term lifecycle support.

Supply support for DS1813-5/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 and mixed-signal ICs for industrial, automotive, and communications applications, emphasizing high reliability and integration density.

The DS1813-5/T&R belongs to Maxim's EconoReset family of supervisory circuits, engineered specifically for cost-sensitive microprocessor systems needing dependable power-up sequencing and field-service reset capability in compact packages.

FAQ

What is the exact VCC trip voltage specification for DS1813-5/T&R?

The DS1813-5/T&R has a nominal VCC trip point of 4.62V, with guaranteed limits of 4.50V (min) and 4.75V (max) - corresponding to the "-5" suffix denoting ±5% tolerance. This value is measured under recommended operating conditions (TA = -40°C to +85°C, VCC = 1.2V to 5.5V) and remains stable due to internal temperature compensation. The DS1813-5/T&R maintains this accuracy without external calibration.

Does DS1813-5/T&R require an external pullup resistor on the RST pin?

No, the DS1813-5/T&R includes an internal 5.5kΩ pullup resistor on the open-drain RST output, making it fully functional in standard 5V systems without external components. This feature reduces BOM count and PCB area. An external pullup is only necessary if interfacing with non-5V logic families or when stronger pullup strength is required beyond the internal resistor's capability. The DS1813-5/T&R datasheet confirms this design in the DC Electrical Characteristics table.

How does the pushbutton reset function work on DS1813-5/T&R?

The DS1813-5/T&R monitors the RST pin for low pulses: pulling RST low for ≥1µs triggers a manual reset, which holds the output low for 150ms after release. This eliminates need for external debounce circuitry. The DS1813-5/T&R detects the edge transition directly, not level duration, enabling reliable operation with basic momentary switches. Timing is internally generated and independent of VCC slew rate.

What package options are available for DS1813-5/T&R?

The DS1813-5/T&R is supplied in SOT-23 surface-mount package (3-pin, JEDEC MO-178AA compliant), indicated by the "/T&R" suffix denoting tape-and-reel packaging. A TO-92 through-hole variant exists for the same part number family but is not designated by "/T&R". The SOT-23 footprint measures 1.3mm × 2.9mm and shares identical pinout (RST-VCC-GND) and electrical specifications with the TO-92 version. The DS1813-5/T&R datasheet confirms mechanical drawings for SOT-23 in the official Maxim documentation.

Is DS1813-5/T&R compatible with 3.3V microcontrollers?

The DS1813-5/T&R is specified for 5V systems and features a 4.62V trip point optimized for 5V rails; its RST output is open-drain and can interface with 3.3V logic only if pulled to 3.3V externally - but doing so compromises the internal 5.5kΩ pullup's intended function. For native 3.3V operation, Maxim offers the DS1813-33 variant. The DS1813-5/T&R should not be used in 3.3V-only designs without verifying level-shifting and trip margin requirements.