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Analog Devices Inc./Maxim Integrated DS1831AS
- Part No.:
- DS1831AS
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
DS1831AS.pdf
- Description:
- IC SUPERVISOR 4 CHANNEL 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,977
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Product details
Overview
DS1831AS from Maxim Integrated is a multisupply voltage monitor and reset IC with integrated watchdog timer, designed to supervise 5V and 3.3V power rails plus two user-configurable sense inputs (IN1/IN2). It provides open-drain RST5V and RST3.3V outputs with selectable reset delays (10ms/100ms/1s), precision 1.25V temperature-compensated reference, and operates from −40°C to +85°C in 16-pin SOIC (150mil) package. Used in embedded systems requiring robust power sequencing and software fault detection.
For engineers reviewing the DS1831AS datasheet, DS1831AS pinout, DS1831AS application, or DS1831AS equivalent, key selection criteria include its dual-supply monitoring capability, watchdog strobe input (ST) and status output (WDS), tolerance-selectable trip points (5%/10%/20%), and compatibility with manual reset sequencing via PBRST5V/PBRST3.3V and MPBRST inputs.
Technical Context
The DS1831AS implements two independent voltage comparators for IN5V and IN3.3V, each with configurable tolerance (via TOL5V/TOL3.3V) and reset delay (via TD5V/TD3.3V), plus two additional referenced comparators (IN1/IN2) tied to a 1.25V bandgap reference. Its internal power is drawn from the higher of IN5V or IN3.3V, requiring ≥1.0V for basic operation and ≥1.5V for accurate monitoring.
It integrates a non-disableable watchdog timer with timeout determined by TDWD (10ms/100ms/1s), triggered by absence of ST transitions, and asserts WDS low on timeout. All reset and NMI outputs are open-drain, requiring external pull-ups, and support pushbutton override with internal 100kΩ pull-ups on PBRST/MPBRST/ST pins.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Input Range | IN5V or IN3.3V: 1.0V to 5.5V - enables operation across brownout and partial-power conditions |
| 5V Trip Point (TOL5V = IN5V) | 4.50V to 4.75V - sets precise 5% tolerance window for reliable 5V rail supervision |
| 3.3V Trip Point (TOL3.3V = Float) | 2.47V to 2.64V - supports wide 20% tolerance for noisy or marginally regulated 3.3V supplies |
| Reset Delay Options | 10ms / 100ms / 1000ms - selected via TD5V/TD3.3V logic levels, ensuring stable release after power-up transients |
| Watchdog Timeout (TDWD = VCC) | 1000ms min - provides fail-safe software hang detection with minimal false triggers |
| Operating Temperature | −40°C to +85°C - qualified for industrial and extended-temperature embedded applications |
| Package | 16-pin SOIC (150mil) - surface-mount compatible with standard PCB assembly processes |
Pinout & Package
DS1831AS is housed in a 16-pin SOIC (150mil) package with 1.27mm pitch, JEDEC MS-012AC compliant, suitable for automated reflow soldering.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 IN3.3V | 3.3V Supply Input | Primary power source for internal circuitry if higher than IN5V; must exceed 1.0V for device operation |
| 2 RST3.3V | 3.3V Reset Output | Open-drain active-low output asserting during 3.3V undervoltage or manual reset; requires external pull-up |
| 3 TOL3.3V | Tolerance Select for 3.3V | Configures trip point tolerance: IN3.3V=5%, GND=10%, float=20% - set at power-up only |
| 4 TD3.3V | Time Delay Select for 3.3V Reset | Sets RST3.3V active duration: GND=10ms, float=100ms, VCC=1000ms - latched at power-up |
| 5 PBRST3.3V | 3.3V Pushbutton Reset Input | Active-low manual reset trigger for RST3.3V; internally pulled up to IN3.3V via 100kΩ |
| 6 NMI1 | Non-Maskable Interrupt 1 | Open-drain output pulsed low when IN1 < 1.25V; used for upstream supply or custom voltage monitoring |
| 7 NMI2 | Non-Maskable Interrupt 2 | Open-drain output pulsed low when IN2 < 1.25V; provides second independent system fault signal |
| 8 MPBRST | Master Pushbutton Reset | Active-low input forcing all RST/NMI outputs low; pulled up to higher of IN5V/IN3.3V via 100kΩ |
| 9 IN5V | 5V Supply Input | Secondary power source; internal bias derived from higher of IN5V or IN3.3V |
| 10 RST5V | 5V Reset Output | Open-drain active-low output asserting during 5V undervoltage or manual reset; requires external pull-up |
| 11 TOL5V | Tolerance Select for 5V | Configures trip point tolerance: IN5V=5%, GND=10%, float=15% - set at power-up only |
| 12 TD5V | Time Delay Select for 5V Reset | Sets RST5V active duration: GND=10ms, float=100ms, VCC=1000ms - latched at power-up |
| 13 PBRST5V | 5V Pushbutton Reset Input | Active-low manual reset trigger for RST5V; internally pulled up to IN5V via 100kΩ |
| 14 IN1 | Voltage Sense Input 1 | Monitored against 1.25V reference; used with external resistor divider for custom trip voltages (e.g., 11.5V) |
| 15 IN2 | Voltage Sense Input 2 | Second independent monitored input with same 1.25V reference and hysteresis (100µV) |
| 16 GND | Ground Reference | Common return for all analog and digital functions; required for accurate comparator operation |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent supply monitoring | Simultaneous supervision of 5V and 3.3V rails with separate reset outputs and configurable tolerances |
| User-configurable reset timing | Three selectable reset hold times per rail (10ms/100ms/1s) via simple logic-level TD inputs |
| Integrated watchdog timer | Non-disableable ST-input watchdog with programmable timeout (10ms–1s) and dedicated WDS status output |
| Two additional voltage monitors | IN1/IN2 inputs referenced to precision 1.25V bandgap, enabling custom trip points via resistor dividers |
| Robust manual reset architecture | Three pushbutton inputs (PBRST5V, PBRST3.3V, MPBRST) with internal 100kΩ pull-ups and debouncing |
Applications
| Industrial PLC Control | Medical Diagnostic Equipment |
|---|---|
Use Scenario: Supervises 5V microcontroller core supply and 3.3V peripheral I/O rail during cold start and brownout events in programmable logic controllers. IC Role / Device Role / Timing Role: DS1831AS acts as primary power-on reset generator and watchdog supervisor, ensuring deterministic boot sequence and software recovery. Use Value: Prevents erratic MCU behavior during unstable power by holding RST5V/RST3.3V active until both supplies stabilize within tolerance and for configurable delay. | Use Scenario: Monitors critical 5V analog front-end supply and isolated 3.3V digital subsystem in portable ultrasound imaging devices. IC Role / Device Role / Timing Role: DS1831AS provides dual-rail reset coordination and uses IN1 to monitor battery-backed 3.3V backup rail, triggering NMI1 on decay. Use Value: Enables early warning of backup power depletion while maintaining safe shutdown sequencing via synchronized RST outputs. |
| Telecom Base Station Controller | Automotive Infotainment Head Unit |
Use Scenario: Ensures reliable startup and runtime supervision of FPGA configuration voltage (3.3V) and processor core voltage (5V) in remote radio units. IC Role / Device Role / Timing Role: DS1831AS serves as system health monitor, using WDS to detect firmware hangs and force controlled reboot via PBRST5V. Use Value: Eliminates need for external watchdog IC by integrating ST-triggered timeout and reset assertion into single chip. | Use Scenario: Supervises 5V infotainment SoC supply and 3.3V CAN transceiver rail in automotive head units exposed to load-dump and cold-crank conditions. IC Role / Device Role / Timing Role: DS1831AS monitors both rails with 10% tolerance (TOL5V/GND, TOL3.3V/GND) and asserts resets during transients. Use Value: Maintains valid reset states down to 1.0V supply, preventing latch-up during cranking-induced voltage sag below 3V. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar multisupply monitoring applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6369ESA+ | Single 3.3V/5V monitor with fixed 200ms reset delay; no watchdog or dual sense inputs | Lacks IN1/IN2 monitoring and ST/WDS watchdog functionality; simpler BOM for basic reset-only use | Select when only basic dual-rail reset is needed without watchdog or extra voltage monitoring |
| TPS3808G33DBVR | Single 3.3V supervisor with adjustable delay (1ms–10s); no 5V monitoring, no watchdog, no NMI outputs | Designed for single-rail systems; lacks multisupply coordination and interrupt generation capability | Choose for cost-sensitive 3.3V-only applications where full DS1831AS feature set is unnecessary |
Compared with MAX6369ESA+ and TPS3808G33DBVR, the DS1831AS uniquely combines dual-rail supervision, two additional sense inputs, and an integrated watchdog in one SOIC package-enabling consolidated system health monitoring without external components or layout changes.
Availability
DS1831AS is available at Aetrix Electronics and suitable for industrial control systems, medical diagnostics equipment, telecom infrastructure, and automotive infotainment requiring stable component supply and long-term lifecycle support.
Supply support for DS1831AS 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 industrial, medical, and communications applications.
The DS1831AS belongs to Maxim's Micromonitor™ family of power-supervisory ICs, engineered specifically for robust, multi-rail voltage monitoring and fail-safe system reset in harsh or mission-critical environments.
FAQ
What is the function of the TDWD pin on the DS1831AS?
The TDWD pin on the DS1831AS selects the watchdog timeout period: grounded = 10ms minimum, floating = 100ms minimum, connected to VCC = 1000ms minimum. This pin directly configures the ST-input watchdog timer that pulses WDS low upon timeout. The DS1831AS watchdog cannot be disabled, and TDWD state is sampled at power-up only.
Does the DS1831AS require external pull-up resistors on its reset outputs?
Yes, the DS1831AS RST5V and RST3.3V outputs are open-drain and require external pull-up resistors to establish valid high-level logic states. A typical value is 10kΩ connected to the respective supply rail (5V or 3.3V). Pull-ups are also required on WDS, NMI1, and NMI2 outputs for proper operation.
How does the DS1831AS determine its internal power source?
The DS1831AS draws internal operating current from the higher voltage level between IN5V and IN3.3V. At least one of these inputs must exceed 1.0V for basic device operation, and ≥1.5V is required for accurate voltage monitoring. If both fall below 1.5V, all outputs remain active low regardless of input conditions.
Can the DS1831AS monitor voltages other than 5V and 3.3V?
Yes, the DS1831AS includes two additional sense inputs (IN1 and IN2), each compared to a precision 1.25V internal reference. Using external resistor dividers, users can configure custom trip points-for example, a 11.5V threshold on IN1-enabling supervision of auxiliary rails like 12V, battery, or isolated supplies.
What is the difference between DS1831AS and DS1831S?
The DS1831AS adds a watchdog timer (with ST input and WDS output) and replaces the DS1831S's master pushbutton status (PBST) functionality. Both share the same 16-pin SOIC (150mil) package and dual-supply monitoring features, but only DS1831AS provides hardware-based software hang detection via the watchdog circuit.
DS1831AS Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- MicroMonitor™
- Package/Case:
- 16-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- 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 FAQ
1.How can I place an order for DS1831AS through Aetrix?
Please submit a Request for Quotation (RFQ) for DS1831AS 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 reliable?
The price and inventory of DS1831AS are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DS1831AS is usually 5 days.
3.What payment methods are accepted for DS1831AS?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DS1831AS transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DS1831AS?
DS1831AS orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DS1831AS 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?
For technical support, including DS1831AS datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DS1831AS requirements.
6.How does Aetrix verify that DS1831AS is sourced from the original manufacturer or authorized distributors?
All DS1831AS 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 meets industry standards.
7.What is the process for return or replacement of DS1831AS?
All DS1831AS units undergo pre-shipment inspection (PSI). If there is an issue with DS1831AS, 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 part is unused and in its original packaging.
Return procedure for DS1831AS:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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