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Analog Devices Inc./Maxim Integrated MAX6831SVUT
- Part No.:
- MAX6831SVUT
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-6
- Datasheet:
-
MAX6831SVUT.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:4,427
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Product details
Overview
The MAX6831SVUT from Maxim Integrated is an ultra-low-voltage dual microprocessor supervisory circuit in SOT23-6 package, designed to monitor primary supply (VCC) at 2.93V and secondary supply (VCC2) at 1.575V, with open-drain active-low RESET output, manual reset input (MR), and 1.6s watchdog timeout. It guarantees valid reset assertion down to VCC = +1.0V and supports critical brownout detection in battery-powered embedded systems.
For engineers reviewing the MAX6831SVUT datasheet, MAX6831SVUT pinout, MAX6831SVUT application, or MAX6831SVUT equivalent, this page delivers verified functional identity, confirmed dual-supply monitoring thresholds, open-drain reset behavior, 140ms minimum reset timeout, and real-world substitution guidance for multivoltage µP supervision designs.
Technical Context
The MAX6831SVUT implements a dual-threshold comparator architecture: one factory-trimmed channel monitors VCC2 (1.575V) with ±3% accuracy over –40°C to +125°C, while the primary VCC monitor uses a fixed 2.93V threshold. Its internal 1.6s watchdog timer clears on any WDI edge and triggers reset if no transition occurs within timeout.
Reset assertion is combinatorial across three independent conditions: VCC falling below 2.93V, VCC2 falling below 1.575V, or MR pulled low. The open-drain RESET output requires external pullup and remains asserted for ≥140ms after all monitored voltages recover and MR returns high.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Reset Threshold | 2.93V (±3%) - sets primary power-fail detection point for 3.3V systems |
| VCC2 Reset Threshold | 1.575V (±3%) - factory-trimmed secondary monitor for core voltage supervision |
| Reset Timeout Period | 140ms (min) - ensures µP reset hold time meets boot initialization requirements |
| Watchdog Timeout | 1.6s (nominal) - provides software execution monitoring with edge-triggered clearing |
| Operating Voltage Range | +1.2V to +5.5V - enables operation during deep brownout down to 1.2V VCC |
| RESET Output Type | Open-drain active-low - allows wired-OR configuration and interface with bidirectional µP reset pins |
| Supply Current (VCC) | 7µA (typ at +25°C, VCC = +3.6V) - minimizes quiescent load in always-on supervision paths |
Pinout & Package
MAX6831SVUT is housed in a 6-pin SOT23-6 package (2.9mm × 1.6mm × 1.1mm), RoHS-compliant, with gull-wing leads and thermal pad not connected internally.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Open-drain active-low reset output; sinks current when asserted; requires external pullup |
| 2 | GND | Ground reference for all internal comparators, timers, and I/O |
| 3 | MR | Active-low manual reset input with 50kΩ internal pullup; asserts reset when pulled ≤0.3×VCC |
| 4 | WDI | Watchdog input; reset triggered if no rising/falling edge occurs within 1.6s; disabled when floating |
| 5 | VCC2 | Secondary supply input; connects directly to monitored core rail (e.g., 1.5V/1.8V domain) |
| 6 | VCC | Primary supply input; powers device and sets main reset threshold (2.93V) |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent voltage monitoring | Simultaneous supervision of primary (2.93V) and secondary (1.575V) rails without external components |
| Guaranteed reset validity to VCC = +1.0V | Ensures deterministic reset assertion even during severe brownout-no undefined output states |
| Immunity to short negative VCC transients | Withstands ≤20µs, 100mV-deep glitches without spurious reset-eliminates need for external filtering |
| No external components required | Factory-trimmed thresholds, integrated pullup on MR, and self-contained watchdog remove BOM cost and layout area |
| 140ms min reset timeout with temperature stability | Timeout varies <±10% over –40°C to +125°C-meets JEDEC JESD22-A108 reliability requirements |
Applications
| Portable/Battery-Powered Equipment | Embedded Controllers |
|---|---|
Use Scenario: Supervising dual-rail power in handheld medical devices with 3.3V I/O and 1.5V core supplies. IC Role / Device Role / Timing Role: Dual-supply monitor asserting open-drain RESET to ARM Cortex-M0+ during VCC2 brownout. Use Value: Prevents corrupted firmware execution when Li-ion battery drops below 3.0V while maintaining core voltage integrity. |
Use Scenario: Ensuring reliable boot sequence in industrial PLC modules with separate 3.3V logic and 1.8V FPGA configuration rails. IC Role / Device Role / Timing Role: Primary supervisor generating 140ms reset pulse synchronized to both supply recoveries. Use Value: Eliminates need for discrete RC reset circuits-reduces board space by 65% and improves timing repeatability. |
| Automotive Systems | Critical µP Monitoring |
Use Scenario: Monitoring cold-cranking performance in body control modules where 12V-to-3.3V DC/DC output and 1.5V MCU core must remain stable. IC Role / Device Role / Timing Role: Dual-threshold detector triggering reset if either rail dips below spec during engine start transient. Use Value: Meets AEC-Q100 Grade 1 (–40°C to +125°C) requirements with guaranteed operation at full temperature range. |
Use Scenario: Protecting safety-critical firmware in aerospace data loggers using watchdog-driven software health checks. IC Role / Device Role / Timing Role: Watchdog timer cleared only on validated instruction flow-resets µP if infinite loop detected. Use Value: Provides hardware-enforced fail-safe recovery with 1.6s timeout aligned to maximum task execution window. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-supply microprocessor supervision applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6829SVUT | Push-pull active-low RESET output; same VCC/VCC2 thresholds and watchdog specs | Requires no external pullup; incompatible with bidirectional µP reset pins | Select when driving standard CMOS reset inputs and board space prohibits pullup resistor |
| TPS3808G15DBVR | Single-supply monitor (1.5V threshold only); no VCC2 input or watchdog; 200ms reset timeout | Lacks secondary rail monitoring and software watchdog-suitable only for single-rail systems | Choose only if design uses single 1.5V supply and watchdog functionality is implemented in firmware |
Compared with MAX6831SVUT, MAX6829SVUT offers push-pull drive but forfeits bidirectional µP compatibility, while TPS3808G15DBVR reduces supervision capability to single-rail only-neither provides the verified dual-threshold + watchdog + open-drain combination of MAX6831SVUT.
Availability
MAX6831SVUT is available at Aetrix Electronics and suitable for portable/battery-powered equipment, embedded controllers, and automotive systems requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6831SVUT 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 precision analog, mixed-signal, and power management ICs for demanding industrial, automotive, and computing applications.
The MAX6826–MAX6831 family was engineered specifically for ultra-low-voltage dual-rail microprocessor supervision in space-constrained, battery-sensitive systems-emphasizing guaranteed operation down to 1.0V VCC and factory-trimmed sub-2V thresholds.
FAQ
What is the exact reset threshold voltage for VCC on the MAX6831SVUT?
The MAX6831SVUT has a factory-trimmed VCC reset threshold of 2.93V (minimum 2.90V, maximum 2.97V) over the full –40°C to +125°C operating range. This value is specified in the Electrical Characteristics table under "VCC Reset Threshold (VCC Falling)" for suffix 'S', and applies exclusively to the MAX6831SVUT-not to other variants like MAX6831TVUT or MAX6831ZVUT.
Does the MAX6831SVUT support monitoring a 1.2V secondary supply?
No. The MAX6831SVUT's VCC2 input is factory-trimmed to 1.575V (suffix 'V') and is not user-adjustable. It does not support 1.2V supervision-devices like MAX6831SDVUT (suffix 'D' = 1.110V) or MAX6826/MAX6827/MAX6828 with RESET IN pin are required for lower secondary thresholds.
Can the MAX6831SVUT's watchdog timer be disabled without modifying the PCB?
Yes. The MAX6831SVUT watchdog function disables automatically when the WDI pin is left unconnected or driven by a three-stated buffer. No solder jumper or trace cut is needed-the internal driver cycles low-high-low every 1.4s to service the timer, preventing unintended resets.
What is the minimum VCC voltage at which MAX6831SVUT guarantees correct reset output behavior?
The MAX6831SVUT guarantees valid RESET output down to VCC = +1.0V, as explicitly stated in the General Description and Absolute Maximum Ratings. Below this, reset assertion is not characterized-designs requiring operation to 0V must use external pulldown resistors (not applicable to open-drain MAX6831SVUT).
Is the MAX6831SVUT pin-compatible with MAX6828SVUT?
No. Although both use SOT23-6 packaging and share identical pin numbering, MAX6828SVUT uses pin 5 as RESET IN (user-adjustable), while MAX6831SVUT uses pin 5 as VCC2 (factory-trimmed). Swapping them causes incorrect monitoring behavior and potential system failure-no pin-to-pin replacement exists between these families.
MAX6831SVUT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SOT-23-6
- Packaging:
- Bulk
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Multi-Voltage Supervisor
- Number of Voltages Monitored:
- 2
- Voltage - Threshold:
- 1.575V, 2.93V
- Output:
- Open Drain or Open Collector
- Reset:
- Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-6
MAX6831SVUT FAQ
1.How can I place an order for MAX6831SVUT through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6831SVUT 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 MAX6831SVUT reliable?
The price and inventory of MAX6831SVUT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6831SVUT is usually 5 days.
3.What payment methods are accepted for MAX6831SVUT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6831SVUT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6831SVUT?
MAX6831SVUT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6831SVUT 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 MAX6831SVUT?
For technical support, including MAX6831SVUT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6831SVUT requirements.
6.How does Aetrix verify that MAX6831SVUT is sourced from the original manufacturer or authorized distributors?
All MAX6831SVUT 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 MAX6831SVUT meets industry standards.
7.What is the process for return or replacement of MAX6831SVUT?
All MAX6831SVUT units undergo pre-shipment inspection (PSI). If there is an issue with MAX6831SVUT, 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 MAX6831SVUT part is unused and in its original packaging.
Return procedure for MAX6831SVUT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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