Analog Devices Inc./Maxim Integrated DS1831E

Overview

DS1831E from Maxim Integrated is a 2.5V/3.3V multisupply micro-monitor IC with dual voltage supervision, pushbutton reset control, and master pushbutton status output (PBST). It monitors IN2.5V and IN3.3V supplies, provides open-drain RST2.5V and RST3.3V outputs, supports user-configurable tolerance (5%/10%/15% for 2.5V; 5%/10%/20% for 3.3V) and reset delay (10ms/100ms/1s), and operates from −40°C to +85°C in 16-pin DIP or SO packages. It is used in embedded systems requiring reliable power-up sequencing and manual reset tracking.

For engineers reviewing the DS1831E datasheet, DS1831E pinout, DS1831E application, or DS1831E equivalent, this page delivers verified functional identity, validated pin roles, confirmed tolerance and delay configurations, PBST output behavior, and real-world use cases for dual-supply monitoring and reset status logging in industrial and telecom equipment.

Technical Context

The DS1831E 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 power is drawn from the higher of IN2.5V or IN3.3V, enabling operation down to 1.0V supply input as long as one rail exceeds that threshold.

Unlike DS1831C/D, the DS1831E replaces the PBRST3.3V input with an open-drain PBST output that latches the status of the most recent master pushbutton reset event-low until cleared by any other reset source-and requires an external pull-up resistor (e.g., 10kΩ) for valid logic level assertion.

Key Specifications

Pinout & Package

DS1831E is available in 16-pin 300mil DIP and 16-pin 150mil SO packages. Both share identical pin numbering and function mapping.

Key Features

Applications

Equivalent & Alternatives

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

Compared with DS1831C, DS1831E trades a dedicated 3.3V pushbutton input for a latched status output - enabling post-event forensic analysis but removing independent 3.3V manual reset control. Compared with MAX6369, DS1831E offers true dual-supply supervision and hardware-level reset origin tracking, at the cost of lacking a programmable watchdog timer.

Availability

DS1831E is available at Aetrix Electronics and suitable for industrial PLCs, telecom line cards, medical imaging subsystems, and automotive infotainment head units requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for DS1831E 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, communications, and computing applications.

The DS1831E belongs to the MicroMonitor™ family of power-supply supervisors, engineered specifically for robust dual-voltage monitoring, manual reset coordination, and hardware-level reset origin tracking in mission-critical embedded systems.

FAQ

What is the key functional difference between DS1831E and DS1831C?

The DS1831E replaces the PBRST3.3V pushbutton input found on DS1831C with an open-drain PBST (pushbutton status) output that latches the most recent master pushbutton reset event. This allows firmware to determine whether the latest reset originated from MPBRST - a capability absent in DS1831C, which retains independent 2.5V and 3.3V pushbutton inputs but no status reporting. DS1831E maintains identical dual-supply monitoring, tolerance selection, and reset delay functionality as DS1831C.

How does the PBST output on DS1831E behave during normal operation?

The PBST output on DS1831E is an open-drain signal that remains high (pulled up externally, e.g., with 10kΩ) until the MPBRST pin is asserted. Once MPBRST is pulled low and released, PBST goes low and stays low until cleared by any other reset source - such as an out-of-tolerance condition on IN2.5V or IN3.3V, or activation of PBRST2.5V. It does not clear automatically on power-up; only a non-MPBRST reset event resets the latch. This behavior is explicitly defined in the DS1831E datasheet section "OPERATION-PUSHBUTTON STATUS".

Can DS1831E monitor voltages other than 2.5V and 3.3V?

Yes. DS1831E includes two additional sense inputs, IN1 and IN2, each referenced to the internal 1.25V bandgap voltage. By using external resistor dividers, users can scale higher voltages (e.g., 5V, 12V, 24V) down to 1.25V for precise monitoring. The DS1831E datasheet provides design equations and example circuits (Figure 9) showing how to calculate R1/R2 values for a given trip point - for instance, a 11.5V trip requires R1 = 820kΩ with R2 = 100kΩ. These inputs drive NMI1 and NMI2 open-drain outputs.

What are the valid configurations for reset time delay on DS1831E?

DS1831E supports three reset hold times per supply: 10ms (TD2.5V or TD3.3V tied to GND), 100ms (TD pin left floating), and 1000ms (TD pin tied to VCC - i.e., to the higher of IN2.5V or IN3.3V). These delays apply independently to RST2.5V and RST3.3V. The actual timing is specified as min/typ/max (e.g., 10ms/16ms/20ms for TD = GND), and values are guaranteed over −40°C to +85°C. No other delay values or intermediate settings are supported - the DS1831E does not offer programmable or analog-adjustable timing.

Does DS1831E require external pull-up resistors on its outputs?

Yes. All DS1831E outputs - RST2.5V, RST3.3V, NMI1, NMI2, and PBST - are open-drain and require external pull-up resistors to establish valid logic-high states. The datasheet specifies 10kΩ as a common value, though the exact resistance is not critical as long as it pulls the output fully high under load. Pull-ups should connect to the appropriate voltage domain (e.g., 3.3V for RST3.3V, 2.5V for RST2.5V). Failure to install pull-ups results in undefined or floating output states, compromising system reliability.