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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Supervisors

Analog Devices Inc./Maxim Integrated DS1831AS/T&R

Name: DS1831AS/T&R
Brand: Analog Devices Inc./Maxim Integrated
SKU: DS1831AS/T&R
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: DS1831AS/T&R

Manufacturer:: Analog Devices Inc./Maxim Integrated

Category:: Supervisors

Package:: 16-SOIC (0.154", 3.90mm Width)

Datasheet:: DS1831AS/T&R.pdf

Description:: IC SUPERVISOR 4 CHANNEL 16SOIC

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Product details

Overview

DS1831AS/T&R from Maxim Integrated is a multisupply micromonitor IC that monitors 5V and 3.3V power rails plus two user-configurable voltage inputs, provides open-drain reset outputs with selectable 10ms/100ms/1s delays, integrates a watchdog timer with ST strobe input, and operates from −40°C to +85°C in a 16-pin SOIC package.

For engineers reviewing the DS1831AS/T&R datasheet, DS1831AS/T&R pinout, DS1831AS/T&R application, or DS1831AS/T&R equivalent, this device supports dual-supply monitoring with tolerance configuration via TOL pins, pushbutton override for system reset, non-maskable interrupt generation for auxiliary voltage supervision, and watchdog timeout enforcement critical for embedded microcontroller reliability.

Technical Context

The DS1831AS/T&R uses an internal 1.25V temperature-compensated bandgap reference to compare IN5V, IN3.3V, IN1, and IN2 against programmable trip thresholds. Its dual TOL inputs set 5% (VCC), 10% (GND), or 15%/20% (floating) tolerances per supply, while TD5V/TD3.3V select reset hold times of 10ms, 100ms, or 1s.

It incorporates a dedicated watchdog function: the ST input must be toggled before timeout (10ms/100ms/1s, set by TDWD) to prevent WDS assertion; if missed, WDS pulses low for ≥100µs. All RST and NMI outputs are open-drain, requiring external pull-ups, and internal biasing draws current from the higher of IN5V or IN3.3V.

Key Specifications

Parameter	Value and Actual Design Meaning
Supply Inputs	IN5V and IN3.3V - device powers internally from the higher of the two; minimum 1.0V required for output validity
Reset Outputs	RST5V and RST3.3V - open-drain, active-low, with user-selectable hold times (10ms/100ms/1s) via TD5V/TD3.3V
Watchdog Function	WDS output and ST strobe input - timeout configurable to 10ms/100ms/1s via TDWD; cannot be disabled
Voltage Trip Accuracy	IN5V trip: 4.50–4.75V (5% tol), 4.25–4.49V (10% tol), or 4.00–4.24V (15% tol); IN3.3V trip: 2.98–3.15V (5% tol), etc.
Operating Temperature	−40°C to +85°C - validated across full industrial range with no derating
Package	16-pin SOIC (150mil width) - RoHS-compliant, surface-mount, tape-and-reel packaged as /T&R
Input Sensing	IN1 and IN2 - referenced to 1.15–1.30V internal comparator threshold; support external resistor dividers for custom trip points

Pinout & Package

DS1831AS/T&R is supplied in a 16-pin SOIC (150mil body width) package with standard JEDEC MS-012AC footprint and 1.27mm pitch.

Pin/Terminal	Circuit Role	Design Meaning
IN5V	5V supply input	Primary power rail input; used for internal bias and 5V monitoring; must exceed 1.0V for operation
IN3.3V	3.3V supply input	Secondary power rail input; used for internal bias and 3.3V monitoring; higher of IN5V/IN3.3V powers internal circuitry
RST5V	5V reset output	Open-drain active-low signal; asserted when IN5V falls out-of-tolerance; hold time set by TD5V
RST3.3V	3.3V reset output	Open-drain active-low signal; asserted when IN3.3V falls out-of-tolerance; hold time set by TD3.3V
TOL5V	5V tolerance select	Configures IN5V trip tolerance: VCC = 5%, GND = 10%, floating = 15%
TOL3.3V	3.3V tolerance select	Configures IN3.3V trip tolerance: VCC = 5%, GND = 10%, floating = 20%
TD5V	5V reset delay select	Sets RST5V active duration: GND = 10ms, float = 100ms, VCC = 1s
TD3.3V	3.3V reset delay select	Sets RST3.3V active duration: GND = 10ms, float = 100ms, VCC = 1s
PBRST5V	5V pushbutton reset input	Active-low manual trigger for RST5V; internally pulled up to IN5V via 100kΩ
PBRST3.3V	3.3V pushbutton reset input	Active-low manual trigger for RST3.3V; internally pulled up to IN3.3V via 100kΩ
MPBRST	Master pushbutton reset input	Active-low global reset trigger; forces all RST/NMI outputs active; pulled up to higher of IN5V/IN3.3V
IN1 / IN2	Auxiliary voltage sense inputs	Referenced to 1.25V internal comparator; support custom trip points via external resistor dividers
NMI1	Non-maskable interrupt 1	Open-drain output pulsed low for ≥10µs when IN1 < 1.25V; includes 100µV hysteresis
WDS	Watchdog status output	Open-drain active-low pulse (≥100µs) upon watchdog timeout; requires external pull-up unless connected to PBRST
ST	Watchdog strobe input	Edge-sensitive (rising/falling) input; must be toggled before TDWD-set timeout to reset watchdog timer
TDWD	Watchdog timeout select	Sets WDS timeout: GND = 10ms, float = 100ms, VCC = 1s
GND	Ground reference	Common return for all analog and digital functions; required for valid comparator and reset operation

Key Features

Feature	Design Value
Dual-supply monitoring with tolerance programming	Independent 5V and 3.3V rail supervision with selectable 5%/10%/15–20% trip tolerances via TOL pins
User-configurable reset timing	Three discrete reset hold durations (10ms/100ms/1s) per rail, set by simple TD pin logic levels - no external components needed
Integrated watchdog timer	Hardware-enforced software health check via ST input; prevents silent hangs without firmware intervention
Two auxiliary voltage comparators	NMI1 output enables supervision of third/fourth rails (e.g., 12V, 2.5V) using external resistor dividers referenced to 1.25V
Robust manual reset architecture	Separate PBRST5V/PBRST3.3V inputs plus MPBRST for hierarchical system-level reset control and sequencing

Applications

Industrial PLC Controller	Medical Diagnostic Equipment
Use Scenario: Monitors main 5V logic supply and isolated 3.3V I/O rail during cold start and brownout events in programmable logic controllers. IC Role / Device Role / Timing Role: DS1831AS/T&R acts as primary power-on reset generator and brownout detector, asserting RST5V/RST3.3V until both supplies stabilize within tolerance and hold reset for 100ms. Use Value: Prevents CPU lockup during unstable power ramp-up; eliminates need for discrete RC reset circuits and reduces BOM count by integrating dual-rail supervision.	Use Scenario: Supervises battery-backed 3.3V real-time clock domain and main 5V imaging subsystem in portable ultrasound units. IC Role / Device Role / Timing Role: DS1831AS/T&R provides independent reset hold timing (1s on 5V, 100ms on 3.3V) and asserts NMI1 on backup rail undervoltage to trigger safe shutdown sequence. Use Value: Ensures deterministic power sequencing and graceful data preservation during battery switchover; meets IEC 62304 Class C safety requirements for fault response.
Automotive Infotainment Head Unit	Network Edge Router
Use Scenario: Monitors 5V MCU core supply and 3.3V CAN transceiver rail in automotive-grade infotainment systems operating across −40°C to +85°C. IC Role / Device Role / Timing Role: DS1831AS/T&R serves as fail-safe reset supervisor with MPBRST tied to service button; watchdog (WDS) connected to PBRST5V to force hard reset on firmware hang. Use Value: Guarantees recovery from software faults without requiring ignition cycle; satisfies ISO 26262 ASIL-B diagnostic coverage for reset integrity.	Use Scenario: Supervises 5V PoE-powered switch controller and 3.3V FPGA configuration rail in carrier-class edge routers with hot-swap capability. IC Role / Device Role / Timing Role: DS1831AS/T&R monitors IN5V and IN3.3V while using IN1 to track 12V fan supply; NMI1 triggers SNMP alert on fan failure without CPU involvement. Use Value: Enables hardware-level fault detection and autonomous response, reducing MTTR and eliminating reliance on polling-based software monitoring.

Industrial PLC Controller

Medical Diagnostic Equipment

Use Scenario: Monitors main 5V logic supply and isolated 3.3V I/O rail during cold start and brownout events in programmable logic controllers.

IC Role / Device Role / Timing Role: DS1831AS/T&R acts as primary power-on reset generator and brownout detector, asserting RST5V/RST3.3V until both supplies stabilize within tolerance and hold reset for 100ms.

Use Value: Prevents CPU lockup during unstable power ramp-up; eliminates need for discrete RC reset circuits and reduces BOM count by integrating dual-rail supervision.

Use Scenario: Supervises battery-backed 3.3V real-time clock domain and main 5V imaging subsystem in portable ultrasound units.

IC Role / Device Role / Timing Role: DS1831AS/T&R provides independent reset hold timing (1s on 5V, 100ms on 3.3V) and asserts NMI1 on backup rail undervoltage to trigger safe shutdown sequence.

Use Value: Ensures deterministic power sequencing and graceful data preservation during battery switchover; meets IEC 62304 Class C safety requirements for fault response.

Automotive Infotainment Head Unit

Network Edge Router

Use Scenario: Monitors 5V MCU core supply and 3.3V CAN transceiver rail in automotive-grade infotainment systems operating across −40°C to +85°C.

IC Role / Device Role / Timing Role: DS1831AS/T&R serves as fail-safe reset supervisor with MPBRST tied to service button; watchdog (WDS) connected to PBRST5V to force hard reset on firmware hang.

Use Value: Guarantees recovery from software faults without requiring ignition cycle; satisfies ISO 26262 ASIL-B diagnostic coverage for reset integrity.

Use Scenario: Supervises 5V PoE-powered switch controller and 3.3V FPGA configuration rail in carrier-class edge routers with hot-swap capability.

IC Role / Device Role / Timing Role: DS1831AS/T&R monitors IN5V and IN3.3V while using IN1 to track 12V fan supply; NMI1 triggers SNMP alert on fan failure without CPU involvement.

Use Value: Enables hardware-level fault detection and autonomous response, reducing MTTR and eliminating reliance on polling-based software monitoring.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
MAX6369KA+T	Single 3.3V/5V monitor with fixed 200ms reset delay; no auxiliary comparators or watchdog; 8-pin SOT23 package	Lacks dual-rail tolerance configuration, NMI outputs, and ST-based watchdog - suitable only for basic reset-only use cases	Select when board space is constrained and only one reset output with fixed timing is required; not a functional substitute for DS1831AS/T&R's feature set
TPS3808G33DBVR	Single 3.3V supervisor with adjustable delay (1ms–10s) and manual reset; no 5V monitoring, no watchdog, no auxiliary sense inputs	Supports only one supply rail; no dual-voltage tolerance selection or NMI interrupt capability	Choose for cost-sensitive designs needing only 3.3V reset with programmable delay; cannot replace DS1831AS/T&R in dual-supply or watchdog-dependent systems

Compared with MAX6369KA+T and TPS3808G33DBVR, DS1831AS/T&R uniquely combines dual-rail monitoring with independently configurable tolerances and delays, integrated watchdog with strobe input, and two auxiliary voltage comparators - making it the only option among the three capable of full-system power integrity supervision in complex embedded platforms.

Availability

DS1831AS/T&R is available at Aetrix Electronics and suitable for industrial automation, medical diagnostics, automotive infotainment, and network infrastructure applications requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.

Supply support for DS1831AS/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 demanding industrial, automotive, and communications applications.

The DS1831AS/T&R belongs to Maxim's Micromonitor™ family of power-supervisory ICs, engineered specifically for robust, multi-rail voltage monitoring and fail-safe reset generation in mission-critical embedded systems.

FAQ

What is the function of the TDWD pin on the DS1831AS/T&R?

The TDWD pin on the DS1831AS/T&R selects the watchdog timeout period: grounded for 10ms, floating for 100ms, or tied to VCC for 1s. This pin exclusively controls the WDS output behavior and is not present on non-watchdog variants like DS1831S/T&R. The DS1831AS/T&R watchdog cannot be disabled - continuous ST strobing is required to prevent timeout assertion.

Can DS1831AS/T&R monitor voltages other than 5V and 3.3V?

Yes, DS1831AS/T&R can monitor two additional voltages via IN1 and IN2 inputs, each compared against the internal 1.25V reference. Using external resistor dividers, users configure trip points for rails such as 12V, 2.5V, or 1.8V. The NMI1 output pulses low when the divided voltage drops below 1.25V, enabling hardware-triggered fault responses independent of the main processor.

How does DS1831AS/T&R determine its internal power source?

DS1831AS/T&R draws all internal operating current from the higher of the IN5V or IN3.3V supply inputs - no external VCC connection is needed. As long as one input exceeds 1.0V, outputs remain valid; however, accurate voltage monitoring requires at least one of IN5V or IN3.3V to be ≥1.5V. This dual-input power architecture ensures operation during asymmetric supply sequencing.

What are the reset timing options for RST5V and RST3.3V on DS1831AS/T&R?

DS1831AS/T&R provides three discrete reset hold durations for each output: 10ms (TDx = GND), 100ms (TDx = floating), or 1s (TDx = VCC), where x is 5V or 3.3V. These delays begin after the associated supply enters tolerance and are enforced regardless of pushbutton activity. The timing is factory-characterized with ±20% variation over temperature and supply voltage.

Is DS1831AS/T&R pin-compatible with other devices in the DS1831 family?

Yes, DS1831AS/T&R shares identical 16-pin SOIC (150mil) pinout with DS1831S/T&R and DS1831BS/T&R. However, functionality differs: DS1831AS/T&R substitutes NMI2 and MPBRST with WDS and ST for watchdog operation, while DS1831BS/T&R replaces them with PBST and retains NMI2. Pin compatibility enables drop-in replacement only within same variant group (e.g., DS1831AS/T&R ↔ DS1831A/T&R).

DS1831AS/T&R Specifications

Product attributes: Attribute value

Manufacturer:: Analog Devices Inc./Maxim Integrated

Series:: MicroMonitor™

Package/Case:: 16-SOIC (0.154", 3.90mm Width)

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Programmable:: Not Verified

Type:: Multi-Voltage Supervisor

Number of Voltages Monitored:: 4

Voltage - Threshold:: 3.3V, 5V, Adj

Output:: Open Drain or Open Collector

Reset:: Active Low

Reset Timeout:: 10ms; 100ms; 1,000ms Minimum

Operating Temperature:: -40°C ~ 85°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 16-SOIC

DS1831AS/T&R FAQ

1.How can I place an order for DS1831AS/T&R through Aetrix?

Please submit a Request for Quotation (RFQ) for DS1831AS/T&R on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for DS1831AS/T&R reliable?

The price and inventory of DS1831AS/T&R are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DS1831AS/T&R is usually 5 days.

3.What payment methods are accepted for DS1831AS/T&R?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DS1831AS/T&R transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for DS1831AS/T&R?

DS1831AS/T&R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your DS1831AS/T&R order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for DS1831AS/T&R?

For technical support, including DS1831AS/T&R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DS1831AS/T&R requirements.

6.How does Aetrix verify that DS1831AS/T&R is sourced from the original manufacturer or authorized distributors?

All DS1831AS/T&R products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that DS1831AS/T&R meets industry standards.

7.What is the process for return or replacement of DS1831AS/T&R?

All DS1831AS/T&R units undergo pre-shipment inspection (PSI). If there is an issue with DS1831AS/T&R, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The DS1831AS/T&R part is unused and in its original packaging.

Return procedure for DS1831AS/T&R:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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