Analog Devices Inc./Maxim Integrated DS1831C+

Overview

DS1831C+ from Maxim Integrated is a dual-supply voltage monitor IC that supervises 2.5V and 3.3V power rails while providing two additional user-configurable voltage sense inputs (IN1, IN2), open-drain reset outputs (RST2.5V, RST3.3V), non-maskable interrupts (NMI1, NMI2), and master/manual pushbutton reset (MPBRST). It draws internal power from the higher of IN2.5V or IN3.3V, supports 5%/10%/15% tolerance selection per rail, and delivers configurable reset delays of 10ms/100ms/1s - used in embedded systems requiring robust multi-rail power sequencing and fault detection.

For engineers reviewing the DS1831C+ datasheet, DS1831C+ pinout, DS1831C+ application, or DS1831C+ equivalent, this page provides verified functional identity, validated pin roles, confirmed tolerance and delay configurations, real-world use cases for multi-supply monitoring, and two technically documented alternative parts with precise functional distinctions.

Technical Context

The DS1831C+ integrates two precision voltage comparators referenced to a 1.25V temperature-compensated bandgap, each monitoring IN2.5V and IN3.3V against user-selectable trip points via TOL2.5V/TOL3.3V pins. Its internal bias circuitry enables operation as long as either supply exceeds 1.0V, with accurate monitoring requiring ≥1.5V on at least one supply input.

Reset timing is controlled by TD2.5V and TD3.3V pins, selecting fixed delays (10ms/100ms/1s) for RST2.5V and RST3.3V outputs respectively. The MPBRST pin forces all resets and NMIs active low when pulled low for ≥20µs, with internal 100kΩ pull-up tied to the higher of IN2.5V or IN3.3V - enabling system-level manual override without external components.

Key Specifications

Pinout & Package

DS1831C+ is available in 16-pin 300mil DIP and 16-pin 150mil SO packages. Both share identical pin mapping and electrical behavior.

Key Features

Applications

Equivalent & Alternatives

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

Compared with DS1831C+, MAX6369KA+T offers watchdog functionality but omits 2.5V monitoring and dual NMI capability, while TPS3808G33DBVR provides basic 3.3V reset only - neither supports the DS1831C+'s multi-rail sequencing, tolerance tuning, or field-serviceable reset architecture.

Availability

DS1831C+ is available at Aetrix Electronics and suitable for telecom infrastructure, industrial automation, medical diagnostics, and embedded networking applications requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.

Supply support for DS1831C+ 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 power management, sensing, and interface applications in industrial, automotive, and communications markets.

The DS1831C+ belongs to Maxim's MicroMonitor™ family of intelligent power supervisors, engineered specifically for systems with multiple voltage domains requiring coordinated reset sequencing, fault logging, and field-serviceable reset control.

FAQ

What is the minimum supply voltage required for DS1831C+ to operate?

The DS1831C+ requires at least one of its primary supply inputs - IN2.5V or IN3.3V - to be above 1.0V to maintain basic output functionality. For accurate voltage monitoring, however, at least one supply must exceed 1.5V. Below 1.5V, all outputs remain in the active (low) state to ensure fail-safe behavior during deep brownout conditions.

How does DS1831C+ select its internal power source?

The DS1831C+ automatically draws internal operating current from the higher of the IN2.5V or IN3.3V inputs. This eliminates the need for an external VCC rail and ensures reliable operation even if one supply drops out, provided the remaining supply stays within 1.0V–5.5V. The internal bias circuitry dynamically tracks the dominant rail without user intervention.

Can DS1831C+ monitor voltages higher than 3.3V?

Yes - DS1831C+ can monitor higher voltages such as 5V, 12V, or 24V using the IN1 and IN2 sense inputs. These pins are referenced to the internal 1.25V bandgap, so external resistor dividers scale the target voltage down to 1.25V. For example, a 12V rail would use an R1:R2 ratio of ~8.6:1 to achieve the correct trip point, as confirmed in the DS1831C+ application diagrams.

What happens when both PBRST2.5V and MPBRST are asserted simultaneously on DS1831C+?

When both PBRST2.5V and MPBRST are pulled low, the DS1831C+ prioritizes the master pushbutton function: RST2.5V, RST3.3V, NMI1, and NMI2 all go active low regardless of individual pushbutton states. The MPBRST signal overrides per-rail reset inputs, ensuring synchronized system-wide reset - critical for recovery from catastrophic faults where partial resets could leave subsystems in inconsistent states.

Is DS1831C+ pin-compatible with DS1831D or DS1831E variants?

No - DS1831C+, DS1831D, and DS1831E share the same package and pin count but differ in pin functionality. For example, DS1831D replaces NMI2 and MPBRST with WDS and ST pins, while DS1831E substitutes PBRST3.3V with PBST. Swapping variants without PCB revision will result in incorrect or nonfunctional behavior; each variant requires dedicated layout and firmware integration.