Analog Devices Inc./Maxim Integrated DS1831ES+

Overview

DS1831ES+ from Maxim Integrated is a 2.5V/3.3V multisupply micro-monitor IC with pushbutton status output, dual voltage supervision (IN2.5V and IN3.3V), two user-configurable sense inputs (IN1, IN2), open-drain reset outputs (RST2.5V, RST3.3V), and non-maskable interrupt outputs (NMI1, NMI2). It operates from −40°C to +85°C and supports selectable reset time delays (10ms/100ms/1s) and voltage tolerances (5%/10%/15% for 2.5V; 5%/10%/20% for 3.3V). Used in industrial embedded systems requiring reliable power sequencing and fault detection.

For engineers reviewing the DS1831ES+ datasheet, DS1831ES+ pinout, DS1831ES+ application, or DS1831ES+ equivalent, this page delivers verified functional identity, confirmed 16-pin SOIC (150mil) package mapping, validated pin roles including PBST status output, tolerance/time-delay configuration logic, and real-world use cases in multi-rail power management and fail-safe microcontroller supervision.

Technical Context

The DS1831ES+ integrates two precision voltage comparators referenced to a 1.25V temperature-compensated bandgap, enabling accurate monitoring of 2.5V and 3.3V supplies plus two external voltages via IN1 and IN2. Its internal power is drawn from the higher of IN2.5V or IN3.3V, requiring ≥1.0V on at least one supply for operation and ≥1.5V for valid voltage sensing.

Unlike DS1831C/D variants, DS1831ES+ replaces the master pushbutton reset (MPBRST) with a dedicated open-drain PBST output that latches the status of the most recent reset event - low if triggered by MPBRST, high otherwise - and retains state until cleared by another reset source. TOL and TD pins configure trip-point tolerance and reset delay per supply independently at power-up.

Key Specifications

Pinout & Package

DS1831ES+ is housed in a 16-pin small-outline integrated circuit (SOIC) package with 150mil body width and standard JEDEC MS-012AC dimensions (10.3mm × 7.5mm × 2.35mm). Pin pitch is 1.27mm; leads are gull-wing, surface-mount compatible.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar multisupply monitoring applications.

Compared with DS1831ES+, DS1831CS+ offers identical voltage monitoring and reset timing but removes PBST in favor of MPBRST - trading diagnostic capability for manual control. MAX6369ESA+ reduces feature set further, eliminating 2.5V supervision and auxiliary inputs entirely, making it suitable only for simpler single-supply systems where watchdog reliability outweighs multi-rail observability.

Availability

DS1831ES+ is available at Aetrix Electronics and suitable for industrial PLC power management, medical diagnostic equipment, telecom line card supervision, automotive infotainment gateways, and embedded computing platforms requiring stable component supply and long-term lifecycle support.

Supply support for DS1831ES+ 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 high-performance analog, mixed-signal, and power management ICs for industrial, communications, and computing applications.

The DS1831 family is designed for robust multi-rail power supervision in harsh environments - delivering precise voltage monitoring, configurable reset behavior, and diagnostic outputs like PBST to simplify system-level fault analysis and improve field reliability.

FAQ

What is the function of the PBST pin on the DS1831ES+?

The PBST pin on the DS1831ES+ is an open-drain pushbutton status output that latches the cause of the most recent reset event. It asserts low only when the last reset was triggered by the MPBRST input and remains low until cleared by any subsequent non-MPBRST reset (e.g., power-up or PBRST2.5V assertion). This allows firmware to distinguish between manual and automatic resets without external memory - a key differentiator from DS1831CS+ and DS1831D variants.

How does the DS1831ES+ determine its internal power source?

The DS1831ES+ draws internal operating current from the higher of the IN2.5V or IN3.3V supply inputs - no external VCC pin is required. The device remains functional as long as at least one supply is ≥1.0V, but accurate voltage monitoring requires ≥1.5V on either IN2.5V or IN3.3V. If both fall below 1.0V, all outputs default to active (low) state to ensure fail-safe behavior.

Can the DS1831ES+ monitor voltages other than 2.5V and 3.3V?

Yes - the DS1831ES+ includes two dedicated sense inputs, IN1 and IN2, each connected to a comparator referenced to a precision 1.25V bandgap. By using external resistor dividers, users can scale higher voltages (e.g., 5V, 12V, 48V) down to the 1.25V threshold. The resulting NMI1 or NMI2 pulses indicate out-of-tolerance conditions on those auxiliary rails, enabling supervision beyond the primary 2.5V/3.3V supplies.

What are the valid configurations for reset time delay on the DS1831ES+?

The DS1831ES+ supports three reset time-delay options per supply, selected via the TD2.5V and TD3.3V pins: connecting to GND yields a minimum 10ms active reset period, leaving the pin floating gives 100ms, and tying it to the associated supply (IN2.5V or IN3.3V) sets 1000ms. These delays are fixed at power-up and cannot be changed dynamically - they define the minimum duration RST2.5V or RST3.3V remains low after a fault clears.

Does the DS1831ES+ include a watchdog timer function?

No - the DS1831ES+ does not include a watchdog timer. That feature is exclusive to the DS1831D and DS1831DS variants, which replace one NMI output with WDS (watchdog status) and ST (strobe input). The DS1831ES+ retains both NMI1 and NMI2 outputs and substitutes MPBRST with PBST, making it optimized for diagnostic-aware multi-rail supervision rather than software-execution monitoring.