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Analog Devices Inc./Maxim Integrated MAX6831VDUT-T
- Part No.:
- MAX6831VDUT-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-6
- Datasheet:
-
MAX6831VDUT-T.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:2,385
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Product details
Overview
MAX6831VDUT-T from Maxim Integrated is an ultra-low-voltage dual-supply microprocessor supervisory IC with open-drain active-low RESET output, factory-trimmed VCC2 monitor (1.575V threshold), manual reset input, and 1.6s watchdog timer. It monitors primary supply VCC (1.53V–2.0V range) and secondary supply VCC2 (0.9V–2.5V), asserts reset down to VCC = +1.0V, and operates across –40°C to +125°C in a 6-pin SOT23 package for battery-powered embedded systems.
For engineers reviewing the MAX6831VDUT-T datasheet, MAX6831VDUT-T pinout, MAX6831VDUT-T application, or MAX6831VDUT-T equivalent, key selection considerations include its fixed 1.575V VCC2 threshold (suffix V), open-drain RESET output compatibility with bidirectional µP reset pins, guaranteed reset validity at VCC ≥ 1.0V, and immunity to short negative VCC transients - critical for reliable power sequencing in portable and multivoltage systems.
Technical Context
The MAX6831VDUT-T integrates two independent voltage comparators: one for primary VCC (programmable threshold via suffix V: 1.53V–2.0V), and one for secondary VCC2 (factory-trimmed to 1.575V). 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 from VCC undervoltage, VCC2 undervoltage, MR low, or watchdog timeout; reset remains asserted for ≥140ms after all fault conditions clear. The open-drain RESET output supports wired-AND configurations and interfaces directly with bidirectional µP reset I/O (e.g., Motorola 68HC11) using a single external pullup resistor.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Operating Range | +1.53V to +2.0V - supports core supplies of ultra-low-power MCUs and SoCs |
| VCC2 Threshold | 1.575V (typ), ±0.05V over –40°C to +125°C - factory-trimmed for precise secondary rail monitoring |
| Reset Timeout Period | 140ms (min) - ensures sufficient hold time for full µP initialization and memory stabilization |
| Watchdog Timeout | 1.6s (nominal), 0.8s–2.6s over temperature - provides robust software execution monitoring without excessive overhead |
| RESET Output Type | Active-low open-drain - enables direct interface with bidirectional µP reset pins and shared reset buses |
| Supply Current (VCC) | 25µA (max) at –40°C to +125°C, VCC = +1.8V - minimizes quiescent power in always-on supervision circuits |
| Reset Valid Down to | VCC = +1.0V - guarantees correct reset state during deep brownout and power-down sequences |
Pinout & Package
Package: 6-pin SOT23 (U6+1 outline, land pattern 90-0175), RoHS-compliant, surface-mount.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Active-low open-drain reset output; sinks current when asserted; requires external pullup for logic HIGH |
| 2 | GND | Ground reference for all internal comparators, timers, and I/O |
| 3 | MR | Manual reset input (active-low); internal 50kΩ pullup to VCC; resets system when pulled low |
| 4 | WDI | Watchdog input; rising or falling edge clears 1.6s timer; unconnected or three-stated disables watchdog |
| 5 | VCC2 | Secondary supply input; monitored against factory-trimmed 1.575V threshold |
| 6 | VCC | Primary supply input; monitored against suffix-defined threshold (V = 1.575V nominal) |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent voltage monitoring | Simultaneously supervises primary VCC (1.53V–2.0V) and secondary VCC2 (1.575V fixed) with separate comparators and hysteresis |
| Open-drain RESET with bidirectional µP support | Eliminates need for level-shifting or external logic when interfacing with µPs like 68HC11 that share reset I/O functionality |
| Guaranteed operation down to VCC = +1.0V | Ensures deterministic reset behavior during severe brownout, preventing undefined µP states and flash corruption |
| No external components required | Integrates pullup on MR, precision references, watchdog timer, and reset delay generator - reduces BOM count and PCB area |
| Immunity to short negative VCC transients | Withstands ≤20µs, 100mV VCC glitches without spurious reset - improves noise resilience in noisy power environments |
Applications
| Portable/Battery-Powered Equipment | Embedded Controllers |
|---|---|
Use Scenario: Supervising dual-rail power in handheld medical devices with 1.8V core and 1.5V I/O supplies. IC Role / Device Role / Timing Role: Dual-supply supervisor asserting open-drain RESET to coordinate safe boot and brownout recovery. Use Value: Prevents erratic MCU operation during battery sag by triggering reset before VCC2 drops below 1.575V, ensuring data integrity. |
Use Scenario: Monitoring power rails in industrial PLC modules with isolated 1.8V logic and 1.5V sensor interface supplies. IC Role / Device Role / Timing Role: Fault-detection node providing fail-safe reset initiation and watchdog supervision for real-time control firmware. Use Value: Guarantees reset validity down to VCC = +1.0V, enabling reliable shutdown sequencing even during partial power loss. |
| Intelligent Instruments | Critical µP Monitoring |
Use Scenario: Power supervision in portable oscilloscope front-ends requiring stable 1.8V ADC and 1.5V FPGA configuration rails. IC Role / Device Role / Timing Role: Dual-threshold supervisor with manual reset for field service and watchdog for firmware hang detection. Use Value: Factory-trimmed VCC2 threshold eliminates calibration effort while 140ms minimum timeout ensures complete analog settling before release. |
Use Scenario: Ensuring deterministic startup and runtime reliability in aerospace-grade telemetry controllers operating at –40°C to +125°C. IC Role / Device Role / Timing Role: High-reliability supervisory circuit with guaranteed reset assertion across full automotive temperature range. Use Value: Immunity to short VCC transients prevents false resets during switching regulator noise, maintaining mission-critical uptime. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-supply µP supervision applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6830VDUT-T | Push-pull active-high RESET output instead of open-drain active-low; same VCC/VCC2 thresholds and watchdog | Requires level translation or redesign for µPs with bidirectional reset pins; better suited for systems needing active-HIGH reset signaling | Select MAX6830VDUT-T only if active-HIGH push-pull drive is required and bidirectional µP interface is not needed |
| TPS3808G15DBVR | Single-supply supervisor (1.5V threshold), no VCC2 monitor, no watchdog, 200ms reset timeout, SOT23-6 package | Lacks dual-rail monitoring and watchdog functionality; suitable only for basic VCC-only supervision where secondary rail is self-monitored | Choose TPS3808G15DBVR only when secondary supply supervision and watchdog are unnecessary and cost reduction is prioritized |
Compared with MAX6830VDUT-T and TPS3808G15DBVR, the MAX6831VDUT-T uniquely delivers open-drain RESET for bidirectional µP compatibility, integrated VCC2 supervision at 1.575V, and 1.6s watchdog - making it the only option among the three that fully satisfies dual-rail, watchdog-enabled, and flexible reset-bus design requirements.
Availability
MAX6831VDUT-T is available at Aetrix Electronics and suitable for portable/battery-powered equipment, embedded controllers, and intelligent instruments requiring stable component supply across –40°C to +125°C industrial temperature range.
Supply support for MAX6831VDUT-T 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 was engineered specifically for ultra-low-voltage dual-rail µP supervision in space-constrained, battery-sensitive systems - emphasizing guaranteed sub-2V operation, minimal quiescent current, and robust noise immunity.
FAQ
What is the exact VCC2 reset threshold voltage for MAX6831VDUT-T?
The MAX6831VDUT-T has a factory-trimmed VCC2 reset threshold of 1.575V (typical), with min/max values of 1.521V and 1.629V over the full –40°C to +125°C temperature range. This value is fixed by the 'V' suffix and applies exclusively to the VCC2 pin (Pin 5); it is not user-adjustable. The MAX6831VDUT-T does not include the RESET IN pin used for adjustable thresholds in earlier family members.
Does MAX6831VDUT-T support manual reset and watchdog functions simultaneously?
Yes, the MAX6831VDUT-T fully supports concurrent manual reset (MR pin) and watchdog (WDI pin) functionality. Pulling MR low forces immediate reset assertion for the full timeout period, while WDI toggling resets the 1.6s watchdog timer. Both inputs are independently monitored, and either can trigger reset without disabling the other. The MAX6831VDUT-T datasheet confirms this coexistence in the Functional Diagram and Pin Description sections.
What is the recommended pullup resistor value for the open-drain RESET output of MAX6831VDUT-T?
A 10kΩ to 100kΩ pullup resistor to the target logic supply (e.g., VCC or IOVDD) is recommended for the MAX6831VDUT-T open-drain RESET output. Lower values (e.g., 10kΩ) ensure faster rise times for high-speed µPs; higher values (e.g., 100kΩ) minimize standby current. The MAX6831VDUT-T RESET sink capability is ≥50µA at VCC ≥ 1.0V, supporting standard CMOS logic levels across the full operating range.
Can MAX6831VDUT-T monitor a 1.2V supply on the VCC2 pin?
No, the MAX6831VDUT-T cannot reliably monitor a 1.2V supply on VCC2. Its factory-trimmed VCC2 threshold is 1.575V (min 1.521V), so a 1.2V rail will permanently assert reset. For 1.2V supervision, select a variant with suffix 'F' (1.050V) or 'G' (1.110V), such as MAX6831FDUT-T or MAX6831GDUT-T - both of which retain the same open-drain RESET and watchdog features as the MAX6831VDUT-T.
Is MAX6831VDUT-T compatible with bidirectional microcontroller reset pins?
Yes, the MAX6831VDUT-T is explicitly designed for bidirectional µP reset I/O. Its open-drain RESET output allows direct connection to pins like those on the Motorola 68HC11, where the µP can drive the line low during internal reset and the MAX6831VDUT-T can pull it low externally. A single external pullup resistor completes the interface - no level shifters or additional logic are required, as confirmed in the Applications Information section of the MAX6831VDUT-T datasheet.
MAX6831VDUT-T 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-T FAQ
1.How can I place an order for MAX6831VDUT-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6831VDUT-T 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-T reliable?
The price and inventory of MAX6831VDUT-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6831VDUT-T is usually 5 days.
3.What payment methods are accepted for MAX6831VDUT-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6831VDUT-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6831VDUT-T?
MAX6831VDUT-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6831VDUT-T 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-T?
For technical support, including MAX6831VDUT-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6831VDUT-T requirements.
6.How does Aetrix verify that MAX6831VDUT-T is sourced from the original manufacturer or authorized distributors?
All MAX6831VDUT-T 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-T meets industry standards.
7.What is the process for return or replacement of MAX6831VDUT-T?
All MAX6831VDUT-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6831VDUT-T, 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-T part is unused and in its original packaging.
Return procedure for MAX6831VDUT-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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