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Analog Devices Inc./Maxim Integrated DS1831S/T&R
- Part No.:
- DS1831S/T&R
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
DS1831S/T&R.pdf
- Description:
- IC SUPERVISOR 4 CHANNEL 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,783
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Product details
Overview
DS1831S/T&R from Maxim Integrated is a multisupply voltage monitor IC with dual power-on reset (5V and 3.3V), two user-configurable sense inputs (IN1/IN2), open-drain reset outputs (RST5V/RST3.3V), and pushbutton reset support - designed for embedded systems requiring robust power sequencing and fault detection in mixed-voltage environments.
For engineers reviewing the DS1831S/T&R datasheet, DS1831S/T&R pinout, DS1831S/T&R application, or DS1831S/T&R equivalent, this device delivers configurable reset timing (10ms/100ms/1s), tolerance selection (5%/10%/15% for 5V; 5%/10%/20% for 3.3V), internal 1.25V temperature-compensated reference, non-maskable interrupt capability, and operation from -40°C to +85°C in a 16-pin SOIC package.
Technical Context
The DS1831S/T&R integrates two independent voltage comparators referenced to a precision 1.25V bandgap, enabling simultaneous monitoring of IN5V and IN3.3V supply rails plus two additional system voltages via IN1 and IN2. Its internal power is drawn from the higher of IN5V or IN3.3V, requiring ≥1.0V on either for basic output validity and ≥1.5V for accurate voltage sensing.
Reset assertion is controlled by TOL5V/TOL3.3V pins (selecting trip-point tolerance) and TD5V/TD3.3V pins (selecting delay: 10ms/100ms/1s). Pushbutton functionality includes dedicated PBRST5V and PBRST3.3V inputs with 20µs minimum pulse width, and MPBRST for master reset - all internally pulled up with 100kΩ resistors to their respective supply rails.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Inputs | IN5V (1.0–5.5V) and IN3.3V (1.0–5.5V); device powers itself from higher rail |
| 5V Trip Point | 4.50–4.75V (TOL5V = IN5V, ±5%), 4.25–4.49V (TOL5V = GND, ±10%), or 4.00–4.24V (TOL5V = float, ±15%) |
| 3.3V Trip Point | 2.98–3.15V (TOL3.3V = IN3.3V, ±5%), 2.80–2.97V (TOL3.3V = GND, ±10%), or 2.47–2.64V (TOL3.3V = float, ±20%) |
| Reset Delay Options | Selectable via TD5V/TD3.3V: 10ms (GND), 100ms (float), or 1000ms (VCC) - sets minimum active-reset duration |
| Operating Temperature | -40°C to +85°C - validated for industrial-grade embedded and control applications |
| Package | 16-pin SOIC (150mil width) - RoHS-compliant, surface-mount, tape-and-reel (T&R) format |
| Output Type | Open-drain RST5V and RST3.3V - require external pull-up resistors (e.g., 10kΩ) for logic-high state |
Pinout & Package
DS1831S/T&R is housed in a 16-pin SOIC (150mil width) package with standard JEDEC MS-012AC footprint. Pin functions are identical to the DS1831 family DIP variant, adapted for surface-mount assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (IN3.3V) | 3.3V Supply Input | Primary 3.3V rail input; used for internal bias and as pull-up source for PBRST3.3V |
| 2 (RST3.3V) | 3.3V Reset Output | Open-drain active-low reset signal; requires external pull-up resistor |
| 3 (TOL3.3V) | 3.3V Tolerance Select | Configures 3.3V trip-point tolerance: IN3.3V = ±5%, GND = ±10%, float = ±20% |
| 4 (TD3.3V) | 3.3V Reset Delay Select | Sets RST3.3V active duration: GND = 10ms, float = 100ms, VCC = 1000ms |
| 5 (PBRST3.3V) | 3.3V Pushbutton Reset Input | Active-low manual reset trigger; internally pulled up to IN3.3V via 100kΩ |
| 6 (NMI1) | Non-Maskable Interrupt 1 | Open-drain comparator output referenced to 1.25V; asserts low when IN1 < ~1.25V |
| 7 (NMI2) | Non-Maskable Interrupt 2 | Open-drain comparator output referenced to 1.25V; asserts low when IN2 < ~1.25V |
| 8 (MPBRST) | Master Pushbutton Reset | Active-low global reset; forces both RST outputs and NMI outputs low when asserted |
| 9 (IN5V) | 5V Supply Input | Primary 5V rail input; used for internal bias and as pull-up source for PBRST5V/MPBRST |
| 10 (RST5V) | 5V Reset Output | Open-drain active-low reset signal; requires external pull-up resistor |
| 11 (TOL5V) | 5V Tolerance Select | Configures 5V trip-point tolerance: IN5V = ±5%, GND = ±10%, float = ±15% |
| 12 (TD5V) | 5V Reset Delay Select | Sets RST5V active duration: GND = 10ms, float = 100ms, VCC = 1000ms |
| 13 (PBRST5V) | 5V Pushbutton Reset Input | Active-low manual reset trigger; internally pulled up to IN5V via 100kΩ |
| 14 (IN1) | User-Configurable Sense Input 1 | Monitors external voltage via resistor divider; comparator trips at ~1.25V |
| 15 (IN2) | User-Configurable Sense Input 2 | Monitors second external voltage; same 1.25V reference threshold as IN1 |
| 16 (GND) | Ground Reference | Analog and digital ground return for all internal circuitry and comparators |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent supply monitoring | Simultaneous 5V and 3.3V rail supervision with separate reset outputs and tolerance/delay configuration |
| Two additional voltage sense channels | IN1 and IN2 accept externally scaled voltages (via resistor dividers) referenced to precise 1.25V internal bandgap |
| Configurable reset timing & tolerance | Hardware-selectable trip tolerances (±5/10/15% for 5V; ±5/10/20% for 3.3V) and delays (10/100/1000ms) without firmware |
| Robust pushbutton interface | Three dedicated manual reset inputs (PBRST5V, PBRST3.3V, MPBRST), each with 20µs minimum pulse width and internal 100kΩ pull-ups |
| Non-maskable interrupt outputs | NMI1/NMI2 provide fast, noise-immune (2µs rejection window) open-drain alerts for out-of-tolerance sensed voltages |
Applications
| Industrial PLC Control | Medical Diagnostic Equipment |
|---|---|
|
Use Scenario: Power sequencing and brownout detection across 5V logic, 3.3V microcontroller, and 12V analog front-end supplies. IC Role / Device Role / Timing Role: DS1831S/T&R acts as centralized power supervisor - asserting RST5V and RST3.3V only after both rails stabilize within tolerance, with 100ms delay ensuring FPGA configuration completion. Use Value: Prevents spurious MCU resets during multi-rail power-up transients and enables deterministic recovery from undervoltage events on any monitored rail. |
Use Scenario: Monitoring battery-backed 3.3V real-time clock domain and main 5V processor supply in portable imaging devices. IC Role / Device Role / Timing Role: DS1831S/T&R provides independent reset hold times and uses IN1 to supervise backup battery voltage via resistor divider, triggering NMI1 if below safe threshold. Use Value: Ensures data integrity during power transitions by holding processor reset until backup supply is verified, while alerting firmware of imminent battery depletion. |
| Telecom Line Card | Automotive Infotainment Head Unit |
|
Use Scenario: Supervising multiple isolated DC-DC outputs (5V, 3.3V, ±12V) in carrier-grade line cards with strict power-good sequencing. IC Role / Device Role / Timing Role: DS1831S/T&R monitors primary 5V/3.3V rails and uses IN2 (with scaling) to track -12V rail health; MPBRST allows field-service forced reset without power cycle. Use Value: Eliminates need for discrete comparators and timers, reducing BOM count while supporting hot-swap compliance and remote diagnostics via NMI status. |
Use Scenario: Validating 5V infotainment SoC supply and 3.3V display interface rail under automotive cold-crank (4.5V) and load-dump (18V) conditions. IC Role / Device Role / Timing Role: DS1831S/T&R operates down to 1.0V supply and maintains valid reset outputs during cranking; TOL5V = GND configures ±10% trip for wide-input tolerance. Use Value: Guarantees reliable boot and graceful shutdown during harsh automotive transients, with no software dependency for critical power-fail response. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar multisupply monitoring applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6326US29D3+ | Single-supply (3.3V only), fixed 2.93V reset threshold, no user-configurable tolerance/delay, no secondary sense inputs | Limited to single-rail monitoring; lacks IN1/IN2, NMI outputs, and master pushbutton | Choose for cost-sensitive, single-rail designs where configurability and multi-rail coordination are unnecessary |
| TPS3808G125DBVR | Single 5V supply monitor with adjustable reset threshold (0.4–5V) and programmable delay (1.25ms–10s), but no 3.3V rail support or dual-supply coordination | No native 3.3V monitoring; requires external level-shifting or additional ICs for multi-rail systems | Prefer when fine-grained threshold tuning and long delays are required for one rail, and system architecture permits discrete supervision per rail |
Compared with MAX6326US29D3+ and TPS3808G125DBVR, the DS1831S/T&R uniquely integrates dual-rail (5V/3.3V) supervision, two extra sense channels, hardware-configurable tolerance/delay, and coordinated reset sequencing - making it optimal for compact, multi-voltage embedded systems where board space and design simplicity are critical.
Availability
DS1831S/T&R is available at Aetrix Electronics and suitable for industrial control, medical instrumentation, telecom infrastructure, and automotive electronics requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for DS1831S/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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power management solutions for industrial, communications, and computing markets.
The DS1831S/T&R belongs to Maxim's Micromonitor™ family - engineered for reliable, hardware-based power supervision in resource-constrained embedded systems where deterministic reset behavior and minimal firmware dependency are essential.
FAQ
What is the minimum supply voltage required for DS1831S/T&R to maintain valid reset outputs?
The DS1831S/T&R maintains valid reset outputs as long as at least one of IN5V or IN3.3V remains above 1.0V. However, accurate voltage monitoring - including correct trip-point detection for RST5V and RST3.3V - requires that either IN5V or IN3.3V be ≥1.5V. Below 1.5V, all outputs remain asserted active-low regardless of input conditions. This ensures fail-safe behavior during deep brownouts.
How does the DS1831S/T&R determine which supply powers its internal circuitry?
The DS1831S/T&R automatically draws internal operating current from the higher of the two supply inputs - IN5V or IN3.3V - eliminating the need for an external VCC rail. This architecture simplifies power routing and ensures stable internal bias even if one supply is absent or marginal. The internal 1.25V bandgap reference and comparator circuitry remain functional as long as the selected supply meets the 1.0V minimum.
Can the DS1831S/T&R monitor voltages other than 5V and 3.3V?
Yes - the DS1831S/T&R includes two dedicated sense inputs, IN1 and IN2, each referenced to its internal 1.25V precision bandgap. By using external resistor dividers, users can scale higher or lower system voltages (e.g., 12V, 24V, or 1.8V) down to the 1.25V trip threshold. The datasheet provides design equations and example circuits to calculate appropriate resistor values for target trip points.
What are the timing requirements for the pushbutton inputs on DS1831S/T&R?
All pushbutton inputs (PBRST5V, PBRST3.3V, and MPBRST) require a minimum low pulse width of 20µs to register a valid reset event. The DS1831S/T&R includes internal debouncing circuitry, so no external RC filtering is needed. Each input is pulled up internally - to IN5V for PBRST5V/MPBRST and to IN3.3V for PBRST3.3V - via 100kΩ resistors, simplifying system-level switch interfacing.
Does DS1831S/T&R support watchdog functionality like the DS1831A variant?
No - the DS1831S/T&R is the base variant of the DS1831 family and does not include watchdog timer circuitry. Watchdog functionality (WDS output and ST strobe input) is exclusive to the DS1831A and DS1831AS variants. The DS1831S/T&R retains full dual-supply monitoring, NMI outputs, and pushbutton features but omits the watchdog block to optimize cost and silicon area for applications where software supervision is handled externally.
DS1831S/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, 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
DS1831S/T&R FAQ
1.How can I place an order for DS1831S/T&R through Aetrix?
Please submit a Request for Quotation (RFQ) for DS1831S/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 DS1831S/T&R reliable?
The price and inventory of DS1831S/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 DS1831S/T&R is usually 5 days.
3.What payment methods are accepted for DS1831S/T&R?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DS1831S/T&R transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DS1831S/T&R?
DS1831S/T&R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DS1831S/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 DS1831S/T&R?
For technical support, including DS1831S/T&R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DS1831S/T&R requirements.
6.How does Aetrix verify that DS1831S/T&R is sourced from the original manufacturer or authorized distributors?
All DS1831S/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 DS1831S/T&R meets industry standards.
7.What is the process for return or replacement of DS1831S/T&R?
All DS1831S/T&R units undergo pre-shipment inspection (PSI). If there is an issue with DS1831S/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 DS1831S/T&R part is unused and in its original packaging.
Return procedure for DS1831S/T&R:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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