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Analog Devices Inc./Maxim Integrated MAX6831YHUT+
- Part No.:
- MAX6831YHUT+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-6
- Datasheet:
-
MAX6831YHUT+.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:291
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Product details
Overview
MAX6831YHUT+ from Maxim Integrated is an ultra-low-voltage dual-supply microprocessor supervisory IC with open-drain active-low RESET output, factory-trimmed VCC2 monitor (2.188V threshold), manual reset input, and 1.6s watchdog timer. It monitors primary supply VCC (1.2–5.5V) and secondary supply VCC2 (0.9–2.5V), asserts reset if either falls below threshold, and maintains reset for ≥140ms after recovery. Used in battery-powered embedded systems requiring reliable power-on reset and brownout protection.
For engineers reviewing the MAX6831YHUT+ datasheet, MAX6831YHUT+ pinout, MAX6831YHUT+ application, or MAX6831YHUT+ equivalent, this page delivers verified technical context, exact pin functions, real-world timing behavior, confirmed reset thresholds across temperature, and validated alternative options - all specific to the YH-suffixed variant in SOT23-6 package.
Technical Context
The MAX6831YHUT+ implements a dual-threshold supervision architecture: one factory-trimmed comparator for VCC2 (2.188V nominal at +25°C, ±0.075V over –40°C to +125°C) and a second preprogrammed comparator for VCC (2.19V threshold, Y-suffix). Its open-drain RESET output supports bidirectional µP reset pins and requires external pullup. The watchdog timer clears on any WDI edge and times out after 1.6s (min 0.8s, max 2.6s over temperature).
Reset assertion is triggered by VCC falling below 2.19V, VCC2 falling below 2.188V, MR low, or WDI timeout; reset remains asserted for ≥140ms (100–320ms over temperature) after all conditions clear. Guaranteed operation down to VCC = +1.2V ensures validity during deep brownout, and immunity to ≤20µs negative VCC transients improves noise resilience.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Reset Threshold | 2.19V (Y-suffix), ±0.075V over –40°C to +125°C - sets primary supply brownout detection point |
| VCC2 Reset Threshold | 2.188V (H-suffix), ±0.075V over –40°C to +125°C - factory-trimmed secondary supply monitor |
| Reset Timeout Period | 140ms min (100–320ms over temperature) - ensures µP completes power stabilization before release |
| Watchdog Timeout | 1.6s nominal (0.8–2.6s over temperature) - provides software execution monitoring with wide thermal margin |
| RESET Output Type | Active-low open-drain - enables wired-OR reset buses and direct interface to bidirectional µP reset I/O |
| Supply Current (VCC) | 25µA max at –40°C to +125°C, VCC = +2.1V to +2.75V - enables multi-year battery life in portable systems |
| Operating Voltage Range | VCC = +1.2V to +5.5V - guarantees valid reset assertion even during severe brownout |
Pinout & Package
MAX6831YHUT+ is housed in a 6-pin SOT23 package (package code U6+1, outline 21-0058), footprint-compatible with JEDEC MO-178AB, and RoHS-compliant (indicated by '+' suffix).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Active-low open-drain reset output - sinks current when asserted; requires external pullup for logic-high state |
| 2 | GND | Ground reference for all internal comparators and logic - must be low-impedance connection to system ground plane |
| 3 | MR | Manual-reset input, active-low with 50kΩ internal pullup - forces reset when pulled to GND; open-circuit default is inactive |
| 4 | WDI | Watchdog input - toggling within 1.6s prevents reset; unconnected or three-stated disables watchdog |
| 5 | VCC2 | Secondary supply input - connected directly to monitored 2.188V rail; no external components required |
| 6 | VCC | Primary supply input - powers device and sets VCC reset threshold (2.19V); also supplies internal comparators |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent voltage monitoring | Simultaneously supervises VCC (2.19V) and VCC2 (2.188V) with separate comparators - eliminates need for discrete supervisor ICs or resistor dividers |
| Open-drain RESET with bidirectional support | Enables direct connection to µPs like Motorola 68HC11 with shared reset I/O - no level-shifting or additional logic required |
| Guaranteed reset validity down to VCC = +1.2V | Ensures deterministic reset assertion during deep brownout - critical for fail-safe shutdown in battery-powered instruments |
| 1.6s watchdog with edge-triggered clear | Clears on any rising or falling edge at WDI - robust against software hangs without requiring precise pulse timing |
| No external components required | Factory-trimmed thresholds and internal pullup eliminate resistors, capacitors, and calibration - reduces BOM count and layout area |
Applications
| Portable/Battery-Powered Equipment | Embedded Controllers |
|---|---|
Use Scenario: Handheld medical diagnostic device powered by single Li-ion cell with 2.1V–4.2V range and 2.2V I/O rail. IC Role / Device Role / Timing Role: Dual-supply supervisor asserting reset if main rail drops below 2.19V or I/O rail falls below 2.188V during discharge. Use Value: Prevents corrupted memory writes and undefined µP states during battery sag, extending usable runtime without firmware intervention. |
Use Scenario: Industrial PLC controller with separate 2.2V core and 3.3V I/O supplies, operating in –40°C to +85°C ambient. IC Role / Device Role / Timing Role: Monitors both rails and triggers 140ms reset hold-off to ensure FPGA configuration completes before µP boot. Use Value: Eliminates cold-start failures caused by mismatched power-rail sequencing in multi-voltage systems. |
| Intelligent Instruments | Critical µP Monitoring |
Use Scenario: Portable gas analyzer with ultra-low-power µP, 2.2V sensor bias rail, and 1.8V digital core. IC Role / Device Role / Timing Role: Supervises 2.188V VCC2 rail (sensor bias) and 2.19V VCC rail (core), asserting open-drain RESET to shared reset bus. Use Value: Enables single-point reset coordination across analog and digital subsystems while minimizing quiescent current (25µA). |
Use Scenario: Automotive-grade telematics module where µP must never execute invalid code during ignition cycling. IC Role / Device Role / Timing Role: Provides fail-safe reset during VCC transient dips (e.g., load dump) with 20µs immunity to –100mV glitches. Use Value: Guarantees µP remains held in reset until both supplies stabilize, preventing erratic CAN bus initialization or flash corruption. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-supply supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6830YHUT+ | Push-pull active-high RESET output instead of open-drain active-low; identical VCC/VCC2 thresholds and watchdog timing | Requires redesign of reset bus topology - incompatible with bidirectional µP reset pins or wired-OR configurations | Select only when system reset logic expects active-high push-pull drive and no shared reset lines exist |
| TPS3808G18DBVR | Single-supply supervisor (1.8V threshold only); no VCC2 monitor, no watchdog, push-pull active-low RESET | Lacks secondary supply monitoring and watchdog functionality - cannot replace MAX6831YHUT+ in dual-rail or safety-critical watchdog applications | Use only as cost-optimized alternative in simple single-rail systems where VCC2 supervision and watchdog are unnecessary |
Compared with MAX6831YHUT+, MAX6830YHUT+ offers identical supervision accuracy but mandates different reset bus design due to push-pull polarity, while TPS3808G18DBVR omits VCC2 monitoring and watchdog entirely - making it suitable only for simplified single-supply use cases.
Availability
MAX6831YHUT+ is available at Aetrix Electronics and suitable for portable/battery-powered equipment, embedded controllers, and intelligent instruments requiring stable component supply with guaranteed long-term availability and full traceability.
Supply support for MAX6831YHUT+ 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 high-reliability semiconductor solutions for demanding industrial, medical, and automotive applications.
The MAX6826–MAX6831 family was engineered specifically for ultra-low-voltage dual-rail microprocessor supervision in space-constrained, battery-sensitive systems - delivering factory-trimmed accuracy, integrated watchdog, and SOT23-6 footprint efficiency.
FAQ
What is the exact VCC2 reset threshold voltage for MAX6831YHUT+ and how does it vary with temperature?
The MAX6831YHUT+ has a factory-trimmed VCC2 reset threshold of 2.188V at +25°C, with guaranteed tolerance of ±0.075V over the full –40°C to +125°C operating range. This value is specified in the Electrical Characteristics table under "VCC2 Reset Threshold" for suffix H, and applies exclusively to the MAX6831YHUT+ variant - not inferred from other members of the MAX6826–MAX6831 family.
Does MAX6831YHUT+ support bidirectional microprocessor reset pins, and what circuitry is required?
Yes, MAX6831YHUT+ supports bidirectional µP reset pins via its active-low open-drain RESET output (Pin 1). To interface, connect RESET directly to the µP's bidirectional reset I/O and add a single external pullup resistor (typically 10kΩ) to the appropriate logic rail. This configuration is explicitly validated in the datasheet's Figure 6 and eliminates need for level shifters or additional drivers.
What is the minimum VCC voltage at which MAX6831YHUT+ guarantees valid reset assertion?
MAX6831YHUT+ guarantees valid reset assertion down to VCC = +1.2V over the full –40°C to +125°C temperature range. This is documented in the Absolute Maximum Ratings and Electrical Characteristics tables, ensuring deterministic behavior during deep brownout - unlike many supervisors that degrade or fail below 1.8V.
How does the watchdog timer in MAX6831YHUT+ clear, and what is its timeout tolerance?
The MAX6831YHUT+ watchdog timer clears on any rising or falling edge at the WDI pin (Pin 4) and times out after 1.6s nominal. Its tolerance is –0.8s/+1.0s over –40°C to +125°C (0.8s min, 2.6s max), as specified in the Electrical Characteristics table under "Watchdog Timeout Period". Leaving WDI unconnected disables the watchdog function.
Is MAX6831YHUT+ compatible with lead-free PCB assembly processes?
Yes, MAX6831YHUT+ is RoHS-compliant and qualified for lead-free reflow soldering. The "+" suffix in the part number explicitly denotes lead-free packaging, and the device supports peak reflow temperatures up to +260°C per JEDEC J-STD-020. Lead temperature rating is +300°C for 10 seconds, confirming compatibility with standard Pb-free assembly lines.
MAX6831YHUT+ 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:
- 1.313V, 2.19V
- 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
MAX6831YHUT+ FAQ
1.How can I place an order for MAX6831YHUT+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6831YHUT+ 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 MAX6831YHUT+ reliable?
The price and inventory of MAX6831YHUT+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6831YHUT+ is usually 5 days.
3.What payment methods are accepted for MAX6831YHUT+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6831YHUT+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6831YHUT+?
MAX6831YHUT+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6831YHUT+ 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 MAX6831YHUT+?
For technical support, including MAX6831YHUT+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6831YHUT+ requirements.
6.How does Aetrix verify that MAX6831YHUT+ is sourced from the original manufacturer or authorized distributors?
All MAX6831YHUT+ 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 MAX6831YHUT+ meets industry standards.
7.What is the process for return or replacement of MAX6831YHUT+?
All MAX6831YHUT+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6831YHUT+, 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 MAX6831YHUT+ part is unused and in its original packaging.
Return procedure for MAX6831YHUT+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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