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Analog Devices Inc./Maxim Integrated MAX6831VFUT+
- Part No.:
- MAX6831VFUT+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-6
- Datasheet:
-
MAX6831VFUT+.pdf
- Description:
- MAX6831 DUAL ULTRA-LOW-VOLTAGE
- Quantity:
- Payment:
- Shipping:
Inventory:637
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Product details
Overview
MAX6831VFUT+ from Maxim Integrated is an ultra-low-voltage dual microprocessor supervisory circuit in SOT23-6 package, monitoring primary supply (VCC) at 1.58V and secondary supply (VCC2) at 0.788V with open-drain RESET output, 140ms minimum reset timeout, and 1.6s watchdog timeout. It ensures reliable power-on reset and brownout protection in battery-powered embedded systems.
For engineers reviewing the MAX6831VFUT+ datasheet, MAX6831VFUT+ pinout, MAX6831VFUT+ application, or MAX6831VFUT+ equivalent, this page delivers verified electrical thresholds, factory-trimmed VCC2 monitoring, manual reset timing, watchdog behavior, and real-world design implications for multivoltage µP systems.
Technical Context
The MAX6831VFUT+ integrates two independent voltage monitors: a factory-trimmed VCC2 comparator (0.788V threshold) and a primary VCC monitor (1.58V threshold), both feeding an OR logic gate that triggers reset assertion when either falls below its threshold. Its open-drain RESET output supports bidirectional µP reset pins and requires an external pullup.
It features a 1.6s watchdog timer cleared by WDI edges, a manual reset input with internal 50kΩ pullup, and guaranteed reset validity down to VCC = +1.0V. The device operates across –40°C to +125°C and draws ≤25µA at VCC = +3.6V with no load.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Reset Threshold | 1.58V (min 1.521V, max 1.629V at –40°C to +125°C); sets brownout detection point for primary supply |
| VCC2 Reset Threshold | 0.788V (min 0.761V, max 0.815V at –40°C to +125°C); factory-trimmed for accurate low-voltage core monitoring |
| Reset Timeout Period | 140ms minimum (100–320ms over temperature); ensures µP completes power stabilization before release |
| Watchdog Timeout Period | 1.6s nominal (0.80–2.60s over temperature); detects software hangs without requiring external timing components |
| RESET Output Type | Open-drain; enables direct interface with bidirectional µP reset I/O (e.g., Motorola 68HC11) using single pullup resistor |
| Supply Current (ICC) | 25µA max at VCC = +3.6V, –40°C to +125°C; supports ultra-low-power battery operation |
| Operating Voltage Range | +1.2V to +5.5V on VCC; guarantees functional reset assertion down to VCC = +1.0V |
Pinout & Package
Package: 6-pin SOT23-6, surface-mount, lead-free (RoHS-compliant), footprint compatible with industry-standard SOT23 layout.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Active-low open-drain reset output; sinks current during reset; requires external pullup for high state |
| 2 | GND | Ground reference for all internal comparators and logic; must be low-impedance connection |
| 3 | MR | Manual reset input, active-low, internally pulled up to VCC (50kΩ); asserts reset when pulled to GND |
| 4 | WDI | Watchdog input; reset triggered if no edge occurs within 1.6s; disabled when left floating or three-stated |
| 5 | VCC2 | Secondary supply input; connected directly to monitored low-voltage rail (e.g., 0.9V–2.5V core supply) |
| 6 | VCC | Primary supply input; powers internal circuitry and sets VCC monitor threshold (1.58V for VFUT+) |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent voltage monitoring | Simultaneous supervision of primary (1.58V) and secondary (0.788V) supplies eliminates need for discrete supervisors |
| Factory-trimmed VCC2 threshold | 0.788V ±2.5% over temperature avoids calibration overhead in low-voltage core monitoring |
| Open-drain RESET output | Enables shared reset bus and interoperability with µPs having bidirectional reset I/O without level-shifting |
| Guaranteed reset validity to VCC = +1.0V | Ensures clean reset assertion during deep brownout, preventing partial initialization or latch-up |
| No external components required | Integrates pullup on MR, precision references, timeout delay, and watchdog - reduces BOM count and board area |
Applications
| Portable/Battery-Powered Equipment | Embedded Controllers |
|---|---|
Use Scenario: Wearable health monitor powered by single Li-ion cell with 1.8V I/O and 0.9V core rails. IC Role / Device Role / Timing Role: Dual supervisor asserting reset on VCC (1.8V) and VCC2 (0.9V) dropouts; open-drain RESET interfaces directly to ARM Cortex-M0+ bidirectional reset pin. Use Value: Prevents firmware corruption during battery sag; 25µA quiescent current extends runtime between charges. |
Use Scenario: Industrial PLC module with separate 3.3V I/O and 1.2V FPGA core supplies. IC Role / Device Role / Timing Role: Monitors 3.3V VCC and 1.2V VCC2 simultaneously; 140ms reset timeout allows FPGA configuration completion before release. Use Value: Eliminates risk of partial FPGA bitstream load due to premature reset deassertion. |
| Automotive Systems | Critical µP Monitoring |
Use Scenario: Body control module operating across –40°C to +125°C with 5V main and 2.5V sensor interface rails. IC Role / Device Role / Timing Role: Supervises VCC (5V) and VCC2 (2.5V) with guaranteed function down to VCC = +1.0V; immune to 20µs/100mV VCC transients. Use Value: Maintains system integrity during cold-crank voltage dips without false resets. |
Use Scenario: Medical infusion pump controller where µP reset failure could cause dosage errors. IC Role / Device Role / Timing Role: Provides redundant watchdog (1.6s timeout) and manual reset (MR) with glitch rejection; reset asserted for ≥140ms after recovery. Use Value: Meets IEC 62304 Class C safety requirements via deterministic reset timing and dual-supply fault coverage. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-supply supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6829VFUT+ | Same pinout and VCC/VCC2 thresholds (1.58V/0.788V), but push-pull RESET output instead of open-drain | Requires redesign if interfacing with bidirectional µP reset I/O; no external pullup needed for active-high reset | Select MAX6829VFUT+ only when µP reset pin is unidirectional input and system uses active-high reset logic |
| TPS3808G15DBVR | Single-supply supervisor (1.5V threshold), no VCC2 input; 200ms fixed reset timeout; different pinout (SOT23-6 but non-compatible) | Cannot monitor secondary rail; lacks watchdog and manual reset inputs; requires additional components for dual-rail coverage | Use TPS3808G15DBVR only in cost-sensitive single-rail designs where VCC2 monitoring is unnecessary |
Compared with MAX6831VFUT+, MAX6829VFUT+ offers push-pull drive but loses bidirectional µP compatibility, while TPS3808G15DBVR reduces integration by omitting VCC2 monitoring and watchdog - making MAX6831VFUT+ uniquely suited for compact, dual-rail, watchdog-enabled embedded controllers.
Availability
MAX6831VFUT+ 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 MAX6831VFUT+ 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 and mixed-signal ICs for power, sensing, and interface applications in demanding environments.
The MAX6826–MAX6831 family delivers dual-supply µP supervision with integrated watchdog and manual reset in ultra-small SOT23-6 packages, targeting space-constrained, low-power, and high-reliability embedded systems.
FAQ
What is the exact VCC2 reset threshold voltage for MAX6831VFUT+?
The MAX6831VFUT+ has a factory-trimmed VCC2 reset threshold of 0.788V, with min/max values of 0.761V and 0.815V over the full –40°C to +125°C temperature range. This value is specified in the Electrical Characteristics table under "VCC2 Reset Threshold (VTH2)" for suffix 'V', and applies exclusively to MAX6829/MAX6830/MAX6831 variants - not to MAX6826–MAX6828 which use RESET IN instead.
Does MAX6831VFUT+ support bidirectional microprocessor reset pins?
Yes, MAX6831VFUT+ supports bidirectional µP reset pins via its open-drain RESET output. When connected with a single external pullup resistor to VCC, it can both assert reset (by pulling low) and release reset (allowing the line to rise), matching the behavior required by processors like the Motorola 68HC11. This eliminates level shifters or additional logic needed with push-pull outputs.
How does the watchdog timer in MAX6831VFUT+ behave when WDI is left unconnected?
When WDI is left unconnected, the internal watchdog timer in MAX6831VFUT+ is automatically serviced every ~1.4s by an internal low-high-low pulse, preventing unintended resets. This behavior is documented in the Applications Information section and ensures safe default operation without external circuitry - though explicit WDI toggling remains recommended for robust software hang detection.
What is the minimum VCC voltage at which MAX6831VFUT+ guarantees valid reset assertion?
MAX6831VFUT+ guarantees valid reset assertion down to VCC = +1.0V, as explicitly stated in the General Description and Absolute Maximum Ratings sections. This ensures reliable brownout detection even during severe supply droop, unlike many supervisors that cease functioning below ~1.5V. The device remains fully operational and asserts RESET correctly throughout this range.
Can MAX6831VFUT+ monitor a secondary supply below 0.9V?
No, MAX6831VFUT+ cannot monitor a secondary supply below 0.9V. Its VCC2 input is factory-trimmed for thresholds ranging from 0.788V (suffix 'V') to 2.313V (suffix 'Z'), but the datasheet specifies the usable VCC2 range as +0.9V to +2.5V. Voltages below 0.9V fall outside guaranteed operation and may result in inaccurate or undefined reset behavior - use MAX6826–MAX6828 with adjustable RESET IN for sub-0.9V monitoring.
MAX6831VFUT+ 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:
- Power Supply Monitor
- Number of Voltages Monitored:
- 2
- Voltage - Threshold:
- 1.05V, 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
MAX6831VFUT+ FAQ
1.How can I place an order for MAX6831VFUT+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6831VFUT+ 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 MAX6831VFUT+ reliable?
The price and inventory of MAX6831VFUT+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6831VFUT+ is usually 5 days.
3.What payment methods are accepted for MAX6831VFUT+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6831VFUT+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6831VFUT+?
MAX6831VFUT+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6831VFUT+ 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 MAX6831VFUT+?
For technical support, including MAX6831VFUT+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6831VFUT+ requirements.
6.How does Aetrix verify that MAX6831VFUT+ is sourced from the original manufacturer or authorized distributors?
All MAX6831VFUT+ 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 MAX6831VFUT+ meets industry standards.
7.What is the process for return or replacement of MAX6831VFUT+?
All MAX6831VFUT+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6831VFUT+, 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 MAX6831VFUT+ part is unused and in its original packaging.
Return procedure for MAX6831VFUT+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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