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Analog Devices Inc./Maxim Integrated MAX6831SDUT+
- Part No.:
- MAX6831SDUT+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-6
- Datasheet:
-
MAX6831SDUT+.pdf
- Description:
- IC MPU SUPERVISOR SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:3,065
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Product details
Overview
MAX6831SDUT+ from Maxim Integrated is an ultra-low-voltage dual-supply microprocessor supervisory IC with open-drain active-low RESET output, factory-trimmed VCC2 monitor (2.93V threshold), manual reset input, and 1.6s watchdog timer. It monitors primary supply VCC (2.93V) and secondary supply VCC2 (2.93V), asserts reset if either drops below threshold, and maintains reset for ≥140ms after recovery. Used in portable battery-powered equipment requiring reliable brownout protection.
For engineers reviewing the MAX6831SDUT+ datasheet, MAX6831SDUT+ pinout, MAX6831SDUT+ application, or MAX6831SDUT+ equivalent, key selection criteria include its open-drain RESET output compatibility with bidirectional µP reset pins, guaranteed reset validity down to VCC = +1.0V, immunity to short negative VCC transients, and factory-trimmed 2.93V VCC2 threshold for multivoltage systems.
Technical Context
The MAX6831SDUT+ integrates two independent voltage comparators-one for VCC (threshold = 2.93V) and one for VCC2 (threshold = 2.93V)-feeding an OR logic gate that triggers a reset timeout delay generator. Its watchdog circuit uses an internal 1.6s timer cleared by WDI edge transitions, with glitch rejection on MR (100ns) and propagation delays under 200ns.
This device implements a fixed-threshold dual-monitor architecture with no external components required: VCC2 is factory-trimmed (no resistor divider), RESET is open-drain (compatible with bidirectional µP I/O), and MR includes a 50kΩ internal pullup. It operates across –40°C to +125°C with supply current as low as 7µA at +3.6V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Threshold | 2.93V (±3%, –40°C to +125°C); precisely set for 3.3V I/O rail monitoring with hysteresis. |
| VCC2 Threshold | 2.93V (±3%, –40°C to +125°C); factory-trimmed for direct connection to secondary 3.3V supply-no external resistors needed. |
| Reset Timeout Period | 140ms minimum; ensures µP completes power stabilization before release, preventing premature boot. |
| Watchdog Timeout | 1.6s nominal (0.8s–2.6s over temperature); provides fail-safe recovery if firmware hangs without toggling WDI. |
| RESET Output Type | Open-drain active-low; enables wired-OR configuration and direct interface to bidirectional µP reset pins (e.g., Motorola 68HC11). |
| Operating Voltage Range | +1.2V to +5.5V (–40°C to +125°C); guarantees valid reset assertion even during deep brownout down to VCC = +1.0V. |
| Supply Current | 7µA typical at +3.6V/25°C; ultra-low quiescent current extends battery life in portable equipment. |
Pinout & Package
MAX6831SDUT+ is housed in a RoHS-compliant 6-pin SOT23 package (U6+1 outline, land pattern 90-0175), measuring 2.9mm × 1.6mm × 1.1mm, suitable for high-density PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - RESET | Active-low open-drain reset output | Drives low to assert system reset; requires external pullup; compatible with bidirectional µP reset I/O. |
| 2 - GND | Ground reference | Common return path for all internal comparators, timer, and digital logic; must be low-impedance. |
| 3 - MR | Manual reset input (active-low) | Pull low to force reset; internal 50kΩ pullup allows floating when unused; 100ns glitch rejection prevents false triggers. |
| 4 - WDI | Watchdog input | Edge-sensitive (rising/falling); clears 1.6s timer on transition; unconnected or three-stated disables watchdog. |
| 5 - VCC2 | Secondary supply monitor input | Factory-trimmed 2.93V comparator input; connect directly to 3.3V rail-no external components required. |
| 6 - VCC | Primary supply monitor input | Primary voltage monitor (2.93V threshold); powers internal circuitry and sets logic levels for MR/WDI inputs. |
Key Features
| Feature | Design Value |
|---|---|
| Dual fixed-threshold monitoring | VCC and VCC2 both set to 2.93V (S-suffix), enabling simultaneous supervision of matched 3.3V rails without calibration. |
| Open-drain RESET with no external pullup required for basic operation | Supports shared reset bus and bidirectional µP interfaces (e.g., 68HC11); eliminates need for level-shifting circuitry. |
| Guaranteed reset validity down to VCC = +1.0V | Ensures deterministic reset assertion during severe brownout-critical for data integrity in battery-backed systems. |
| Immunity to short negative VCC transients | Withstands ≤20µs transients down to 100mV below threshold without spurious reset-reduces need for input filtering. |
| No external components required | Eliminates external resistors, capacitors, or trimming-reduces BOM count, board area, and qualification effort. |
Applications
| Portable/Battery-Powered Equipment | Embedded Controllers |
|---|---|
Use Scenario: Handheld medical devices powered by single-cell Li-ion batteries experiencing voltage sag during peak load. IC Role / Device Role / Timing Role: Dual-supply supervisor monitoring main 3.3V rail (VCC) and analog subsystem 3.3V rail (VCC2) to detect simultaneous brownout. Use Value: Prevents corrupted sensor readings or EEPROM writes by asserting reset before VCC/VCC2 fall below 2.93V, with 140ms hold time ensuring stable recovery. |
Use Scenario: Industrial PLC controller with separate I/O and core logic supplies subject to transient coupling. IC Role / Device Role / Timing Role: Independent monitoring of 3.3V I/O rail (VCC2) and 3.3V core rail (VCC) to isolate supply faults before system lockup. Use Value: Open-drain RESET allows direct tie-in to µP's bidirectional reset pin, eliminating level-shifters while maintaining fail-safe restart capability. |
| Intelligent Instruments | Critical µP Monitoring |
Use Scenario: Precision digital multimeter with isolated analog front-end and digital processing section. IC Role / Device Role / Timing Role: Supervises 3.3V analog supply (VCC2) and 3.3V digital supply (VCC) to prevent measurement errors caused by marginal voltage. Use Value: Factory-trimmed 2.93V thresholds eliminate resistor tolerance drift, ensuring consistent trip points across temperature and lifetime. |
Use Scenario: Automotive body control module where µP must remain in reset until both primary and secondary supplies stabilize post-ignition. IC Role / Device Role / Timing Role: Dual-rail monitoring with 1.6s watchdog to catch firmware stalls during CAN message handling. Use Value: Guaranteed reset operation down to VCC = +1.0V ensures deterministic behavior during cranking-induced voltage dips. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-supply supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6830SDUT+ | Push-pull active-high RESET output; identical VCC/VCC2 thresholds (2.93V) and watchdog timing. | Requires µP with active-high reset input; incompatible with bidirectional reset pins without external inverter. | Select when system reset logic expects active-high assertion and board layout cannot accommodate pullup resistor. |
| TPS3808G33DBVR | Single-supply supervisor (3.3V only); no VCC2 monitor; 200ms reset timeout; push-pull active-low RESET. | Lacks secondary supply monitoring-requires additional supervisor or discrete solution for dual-rail systems. | Choose only if monitoring only one 3.3V rail is sufficient and footprint constraints favor TI's 5-pin SOT23 package. |
Compared with MAX6830SDUT+, the MAX6831SDUT+ offers open-drain flexibility for shared reset buses; compared with TPS3808G33DBVR, it provides integrated dual-rail supervision without adding component count or complexity.
Availability
MAX6831SDUT+ is available at Aetrix Electronics and suitable for portable/battery-powered equipment, embedded controllers, intelligent instruments, and critical µP monitoring requiring stable component supply across industrial temperature ranges.
Supply support for MAX6831SDUT+ 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 with integrated watchdog and manual reset-engineered specifically for space-constrained, battery-sensitive systems requiring high reliability across –40°C to +125°C.
FAQ
What is the exact reset threshold voltage for VCC and VCC2 on the MAX6831SDUT+?
The MAX6831SDUT+ has a factory-trimmed reset threshold of 2.93V for both VCC and VCC2, with ±3% tolerance over –40°C to +125°C. This corresponds to the "S" suffix in the part number and is optimized for reliable supervision of standard 3.3V power rails without external calibration components.
Does the MAX6831SDUT+ require external components to configure its VCC2 monitor?
No. The MAX6831SDUT+ features a factory-trimmed VCC2 input with a fixed 2.93V threshold, so no external resistors or dividers are needed-unlike the MAX6826–MAX6828 series. Simply connect the secondary 3.3V supply directly to pin 5 (VCC2) for immediate dual-rail supervision.
Can the MAX6831SDUT+ interface directly with a microcontroller that has a bidirectional reset pin?
Yes. The MAX6831SDUT+ provides an open-drain active-low RESET output (pin 1), which is explicitly designed for direct connection to bidirectional µP reset I/O such as the Motorola 68HC11. A single external pullup resistor suffices-no level shifters or buffers are required.
What is the watchdog timeout period of the MAX6831SDUT+, and how is it cleared?
The MAX6831SDUT+ features a nominal 1.6s watchdog timeout period (0.8s–2.6s over temperature). The internal timer is cleared on any rising or falling edge at the WDI pin (pin 4), or automatically when reset is asserted or MR is pulled low-ensuring robust detection of firmware hangs.
Is the MAX6831SDUT+ guaranteed to operate correctly at very low supply voltages?
Yes. The MAX6831SDUT+ is guaranteed to assert a valid reset signal down to VCC = +1.0V across –40°C to +125°C. This ensures deterministic behavior during deep brownout conditions common in battery-powered systems, unlike many supervisors that fail below 1.8V.
MAX6831SDUT+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SOT-23-6
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Multi-Voltage Supervisor
- Number of Voltages Monitored:
- 2
- Voltage - Threshold:
- 0.788V, 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-6
MAX6831SDUT+ FAQ
1.How can I place an order for MAX6831SDUT+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6831SDUT+ 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 MAX6831SDUT+ reliable?
The price and inventory of MAX6831SDUT+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6831SDUT+ is usually 5 days.
3.What payment methods are accepted for MAX6831SDUT+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6831SDUT+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6831SDUT+?
MAX6831SDUT+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6831SDUT+ 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 MAX6831SDUT+?
For technical support, including MAX6831SDUT+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6831SDUT+ requirements.
6.How does Aetrix verify that MAX6831SDUT+ is sourced from the original manufacturer or authorized distributors?
All MAX6831SDUT+ 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 MAX6831SDUT+ meets industry standards.
7.What is the process for return or replacement of MAX6831SDUT+?
All MAX6831SDUT+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6831SDUT+, 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 MAX6831SDUT+ part is unused and in its original packaging.
Return procedure for MAX6831SDUT+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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