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Analog Devices Inc./Maxim Integrated MAX6831VDUT
- Part No.:
- MAX6831VDUT
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-6
- Datasheet:
-
MAX6831VDUT.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:2,500
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Product details
Overview
MAX6831VDUT from Maxim Integrated is an ultra-low-voltage dual microprocessor supervisory circuit in SOT23-6 package, monitoring primary supply (VCC) and secondary factory-trimmed supply (VCC2) with open-drain RESET output, manual reset input (MR), and 1.6s watchdog timer. It asserts reset when VCC falls below 1.575V or VCC2 falls below 0.788V, maintains reset for ≥140ms, and operates reliably down to VCC = +1.0V. Used in portable battery-powered equipment and multivoltage embedded controllers.
For engineers reviewing the MAX6831VDUT datasheet, MAX6831VDUT pinout, MAX6831VDUT application, or MAX6831VDUT equivalent, key selection criteria include its open-drain RESET output, dual-supply monitoring capability (VCC/VCC2), guaranteed operation at VCC = +1.0V, 140ms minimum reset timeout, and immunity to short negative VCC transients - all critical for brownout protection in low-power systems.
Technical Context
The MAX6831VDUT implements a dual-threshold supervision architecture: one factory-trimmed comparator monitors VCC2 (0.788V nominal threshold), while the primary VCC monitor uses a fixed 1.575V threshold (suffix 'V'). Its internal 1.6s watchdog timer clears on any WDI edge and triggers reset if no transition occurs within timeout.
Reset assertion is OR-combined across VCC undervoltage, VCC2 undervoltage, MR low, or watchdog timeout; reset remains active for ≥140ms after all fault conditions clear. The open-drain RESET output supports bidirectional µP reset pins and requires an external pullup, enabling flexible voltage-level interfacing without contention.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Reset Threshold | 1.575V (min 1.521V, max 1.629V) - sets precise power-fail detection point for primary supply |
| VCC2 Reset Threshold | 0.788V (min 0.761V, max 0.815V) - factory-trimmed for accurate secondary supply (e.g., core voltage) monitoring |
| Reset Timeout Period | ≥140ms - ensures µP completes full power stabilization before release from reset |
| Watchdog Timeout Period | 1.6s nominal (0.80s–2.60s over temp) - provides robust software execution monitoring |
| Operating Voltage Range | +1.0V to +5.5V - guarantees valid reset assertion even during deep brownout |
| RESET Output Type | Open-drain - enables wired-OR configuration and interface with bidirectional µP reset I/O (e.g., Motorola 68HC11) |
| Supply Current (ICC) | ≤30µA at -40°C to +125°C - minimizes quiescent power in battery-critical applications |
Pinout & Package
MAX6831VDUT 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 | Active-low open-drain reset output; requires external pullup; sinks ≥50µA at VCC ≥ 1.0V |
| 2 | GND | Ground reference for all internal comparators, timers, and logic |
| 3 | MR | Manual reset input (active-low); internally pulled up to VCC (50kΩ); accepts CMOS levels |
| 4 | WDI | Watchdog input; edge-sensitive (rising/falling); clears internal 1.6s timer on transition |
| 5 | VCC2 | Secondary supply input; connects directly to monitored voltage (e.g., 0.9V–2.5V core rail) |
| 6 | VCC | Primary supply input; powers device and sets VCC monitor threshold (1.575V) |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent supply monitoring | Simultaneously supervises VCC (1.575V threshold) and VCC2 (0.788V factory-trimmed), eliminating need for discrete supervisors |
| Open-drain RESET with VCC = +1.0V guarantee | Ensures fail-safe reset assertion even during severe brownout - critical for data integrity in flash programming |
| 1.6s watchdog timer with edge-triggered clear | Prevents runaway code by requiring periodic WDI toggling; immune to stuck-high/low faults |
| No external components required | Integrates precision references, comparators, timeout delay, and logic - reduces BOM count and PCB area |
| Immunity to short negative VCC transients | Tolerates ≤20µs glitches down to 100mV below threshold without spurious reset - improves noise resilience |
Applications
| Portable Battery-Powered Equipment | Embedded Controllers |
|---|---|
Use Scenario: Smart sensor node powered by single Li-ion cell with dual-rail DC-DC outputs (3.3V I/O, 1.8V core). IC Role / Device Role / Timing Role: Supervises both rails; asserts open-drain RESET to hold µC in reset until both supplies stabilize post-power-up. Use Value: Prevents erratic boot due to mismatched rail sequencing; leverages open-drain output to share reset line with other peripherals. |
Use Scenario: Industrial PLC controller using ARM Cortex-M with bidirectional reset pin and multiple voltage domains. IC Role / Device Role / Timing Role: Monitors main 3.3V supply and 1.2V core voltage; generates synchronized reset pulse via open-drain output compatible with µC's bidirectional I/O. Use Value: Eliminates level-shifter requirement; ensures deterministic reset timing across voltage domains without contention. |
| Automotive Body Control Modules | Multivoltage Systems |
Use Scenario: Door module with 5V microcontroller, 3.3V CAN transceiver, and 1.2V MCU core - subject to load-dump and cold-crank transients. IC Role / Device Role / Timing Role: Detects VCC (5V) brownout and VCC2 (1.2V) collapse; maintains reset for ≥140ms after recovery to prevent partial initialization. Use Value: Guarantees reset validity down to VCC = +1.0V - survives cold-crank dips where supply drops to ~6V then rebounds slowly. |
Use Scenario: FPGA-based test instrument with 12V, 5V, 3.3V, 1.8V, and 1.2V rails requiring coordinated power sequencing and fault detection. IC Role / Device Role / Timing Role: Dedicated MAX6831VDUT per critical pair (e.g., 3.3V I/O + 1.2V core); provides localized reset generation with minimal latency. Use Value: Enables modular supervision architecture - avoids single-point failure of centralized supervisor; simplifies debug via per-rail reset visibility. |
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 |
|---|---|---|---|
| MAX6829VDUT | Push-pull active-low RESET output (not open-drain); same VCC/VCC2 thresholds and watchdog | Requires dedicated reset net; incompatible with bidirectional µP reset pins or wired-OR configurations | Select MAX6829VDUT only when driving a simple active-low reset input without shared bus requirements |
| TPS3808G15DBVR | Single-supply supervisor (monitors only VCC); 1.5V threshold; 200ms reset timeout; no VCC2 input or watchdog | Lacks secondary supply monitoring and watchdog functionality - insufficient for dual-rail safety-critical systems | Use TPS3808G15DBVR only for cost-sensitive single-rail applications where VCC2 supervision and watchdog are unnecessary |
Compared with MAX6829VDUT, MAX6831VDUT's open-drain output enables shared reset busing and bidirectional µP compatibility, while TPS3808G15DBVR omits VCC2 monitoring and watchdog - making MAX6831VDUT uniquely suited for compact, dual-rail systems requiring robust fault coverage.
Availability
MAX6831VDUT is available at Aetrix Electronics and suitable for portable/battery-powered equipment, embedded controllers, and automotive body control modules requiring stable component supply, long-term lifecycle support, and guaranteed performance across -40°C to +125°C.
Supply support for MAX6831VDUT 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 computing applications.
The MAX6826–MAX6831 family delivers ultra-low-voltage dual-supply supervision in miniature SOT23 packages, targeting space-constrained, battery-operated, and multirail systems where reliability under brownout and transient conditions is critical.
FAQ
What is the exact VCC2 reset threshold voltage for MAX6831VDUT?
The MAX6831VDUT features a factory-trimmed VCC2 monitor with a nominal reset threshold of 0.788V, specified from 0.761V (min) to 0.815V (max) over -40°C to +125°C. This threshold is fixed and not user-adjustable - unlike the RESET IN pin on MAX6826/MAX6827/MAX6828 variants. The VCC2 pin must be connected directly to the secondary supply rail it monitors.
Does MAX6831VDUT support bidirectional microcontroller reset pins?
Yes, MAX6831VDUT supports bidirectional µP reset pins via its open-drain RESET output. When used with a pullup resistor to the appropriate logic voltage, it can drive low to assert reset and release high (via the pullup) to deassert - matching the behavior required by µPs like the Motorola 68HC11. This eliminates contention risks present with push-pull outputs in shared-reset configurations.
What is the minimum VCC voltage at which MAX6831VDUT guarantees valid reset operation?
MAX6831VDUT guarantees valid reset assertion and timing down to VCC = +1.0V, as explicitly stated in the datasheet Absolute Maximum Ratings and Electrical Characteristics tables. This ensures reliable brownout detection and reset hold time even during deep supply sags - a key differentiator versus supervisors that cease functioning below 1.5V or 1.8V.
How does the watchdog timer in MAX6831VDUT clear and timeout?
The MAX6831VDUT watchdog timer has a nominal 1.6s timeout (0.80s–2.60s over temperature) and clears on any rising or falling edge at the WDI pin. If no edge occurs within the timeout period, it triggers a reset pulse lasting ≥140ms. While reset is asserted, the timer remains cleared and does not count - it only resumes timing after reset deassertion.
Can MAX6831VDUT monitor a secondary supply below 0.9V?
No, MAX6831VDUT cannot monitor a secondary supply below 0.9V. Its VCC2 input is factory-trimmed for thresholds ranging from 0.788V (suffix 'D') up to 2.313V (suffix 'Z'), but the device family specification states VCC2 monitoring range is +0.9V to +2.5V. The 0.788V threshold applies only to the 'D' suffix variant (as in MAX6831VDUT) and represents the lowest supported factory-trimmed point - not an extension below 0.9V.
MAX6831VDUT 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:
- 0.788V, 1.58V
- 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
MAX6831VDUT FAQ
1.How can I place an order for MAX6831VDUT through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6831VDUT 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 MAX6831VDUT reliable?
The price and inventory of MAX6831VDUT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6831VDUT is usually 5 days.
3.What payment methods are accepted for MAX6831VDUT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6831VDUT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6831VDUT?
MAX6831VDUT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6831VDUT 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 MAX6831VDUT?
For technical support, including MAX6831VDUT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6831VDUT requirements.
6.How does Aetrix verify that MAX6831VDUT is sourced from the original manufacturer or authorized distributors?
All MAX6831VDUT 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 MAX6831VDUT meets industry standards.
7.What is the process for return or replacement of MAX6831VDUT?
All MAX6831VDUT units undergo pre-shipment inspection (PSI). If there is an issue with MAX6831VDUT, 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 MAX6831VDUT part is unused and in its original packaging.
Return procedure for MAX6831VDUT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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