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Analog Devices Inc./Maxim Integrated MAX6831SZUT-T
- Part No.:
- MAX6831SZUT-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-6
- Datasheet:
-
MAX6831SZUT-T.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:5,000
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Product details
Overview
MAX6831SZUT-T from Maxim Integrated is an ultra-low-voltage dual microprocessor supervisory circuit in SOT23-6 package, designed to monitor primary supply (VCC) at 2.93V ±1.5% and secondary supply (VCC2) at 1.313V ±1.5%, with open-drain active-low RESET output, manual reset input (MR), and 1.6s watchdog timeout. It guarantees valid reset assertion down to VCC = +1.0V and supports portable, automotive, and multivoltage embedded systems.
For engineers reviewing the MAX6831SZUT-T datasheet, MAX6831SZUT-T pinout, MAX6831SZUT-T application, or MAX6831SZUT-T equivalent, this page delivers verified electrical thresholds, watchdog timing behavior, reset timeout stability across -40°C to +125°C, open-drain drive capability (≤0.4V @ 3.2mA), and factory-trimmed dual-supply monitoring without external components.
Technical Context
The MAX6831SZUT-T implements a dual-threshold comparator architecture: one for VCC (2.93V nominal) and one factory-trimmed for VCC2 (1.313V nominal), both with 60ppm/°C temperature coefficient and 2×VTH hysteresis. Its internal 1.6s watchdog timer clears on any WDI edge and triggers reset if no transition occurs within timeout.
Reset assertion is synchronized across three independent conditions - VCC drop below threshold, VCC2 drop below threshold, or MR low - and held for ≥140ms after all conditions clear. The open-drain RESET output enables bidirectional µP interface (e.g., Motorola 68HC11) with external pull-up, supporting system-level reset coordination without contention.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Threshold | 2.93V ±1.5% (ensures reliable power-up reset for 3.3V I/O rails) |
| VCC2 Threshold | 1.313V ±1.5% (factory-trimmed for accurate core voltage monitoring) |
| Reset Timeout | 140ms min (guarantees sufficient hold time for µP initialization) |
| Watchdog Timeout | 1.6s nominal (supports robust firmware execution monitoring) |
| Operating Range | VCC = +2.7V to +3.6V (matches standard 3.3V system supply tolerance) |
| RESET Output | Open-drain, VOL ≤ 0.4V @ ISINK = 3.2mA (enables flexible level-shifting and wired-OR) |
| Supply Current | 7µA typ @ +25°C, VCC = +3.6V (ultra-low quiescent power for battery operation) |
Pinout & Package
MAX6831SZUT-T uses a 6-pin SOT23-6 package with gull-wing leads, 1.27mm pitch, and 2.9mm × 1.6mm footprint. Pin 1 is marked by a dot; device orientation follows JEDEC MO-178AB standard.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Active-low open-drain reset output; requires external pull-up for logic-high state |
| 2 | GND | Ground reference for all internal comparators and timers |
| 3 | MR | Active-low manual reset input with 50kΩ internal pull-up; asserts reset when pulled to GND |
| 4 | WDI | Watchdog input; reset triggered if no edge occurs within 1.6s; disabled when left floating |
| 5 | VCC2 | Secondary supply input for factory-trimmed 1.313V threshold monitoring |
| 6 | VCC | Primary supply input powering internal circuitry and defining 2.93V reset threshold |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent supply monitoring | Simultaneous VCC (2.93V) and VCC2 (1.313V) supervision eliminates need for discrete supervisors |
| Factory-trimmed VCC2 threshold | 1.313V ±1.5% accuracy enables precise core voltage monitoring without calibration |
| Open-drain RESET output | Supports bidirectional µP reset pins (e.g., 68HC11) and wired-OR reset bus architectures |
| Guaranteed operation to VCC = +1.0V | Ensures deterministic reset behavior during deep brownout, critical for automotive safety |
| No external components required | Reduces BOM count and PCB area vs. discrete resistor-divider solutions |
Applications
| Portable/Battery-Powered Equipment | Automotive Systems |
|---|---|
Use Scenario: Power management in handheld medical devices with dual-rail (3.3V I/O / 1.2V core) supplies and strict battery life requirements. IC Role / Device Role / Timing Role: Dual-supply supervisor asserting reset during battery sag or cold-start, with 1.6s watchdog enforcing firmware recovery. Use Value: Prevents corrupted memory writes during brownout and ensures full µP reinitialization after power interruption. | Use Scenario: Engine control unit (ECU) monitoring 3.3V sensor interface rail and 1.2V MCU core rail under wide temperature (-40°C to +125°C) and transient conditions. IC Role / Device Role / Timing Role: Primary reset generator with immunity to short negative VCC transients (<20µs @ 100mV overdrive). Use Value: Maintains deterministic reset state during cranking-induced voltage dips, avoiding unsafe ECU operation. |
| Embedded Controllers | Multivoltage Systems |
Use Scenario: Industrial PLC controller with isolated 3.3V communication interface and 1.8V FPGA configuration rail. IC Role / Device Role / Timing Role: Dual-threshold supervisor coordinating reset across isolated domains via open-drain RESET bus. Use Value: Enables synchronized restart of communication and logic subsystems without cross-domain timing skew. | Use Scenario: High-density server management controller using 3.3V, 1.8V, and 1.2V rails with tight sequencing requirements. IC Role / Device Role / Timing Role: Secondary supply monitor (VCC2 = 1.313V) validating 1.2V rail integrity before releasing main µP reset. Use Value: Adds fail-safe validation layer beyond primary VCC monitoring, preventing boot from unstable core voltage. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-supply supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6829SZUT-T | Push-pull active-low RESET output; same VCC/VCC2 thresholds and watchdog timing | Requires no external pull-up; unsuitable for wired-OR or bidirectional reset buses | Select when driving single-load µP reset pin directly and minimizing external components |
| TPS3808G33DBVR | Single-supply (3.3V) supervisor with adjustable watchdog; no VCC2 monitor or manual reset input | Lacks secondary supply monitoring and MR functionality; lower quiescent current (1.1µA) | Select only for simplified 3.3V-only systems where VCC2 monitoring is unnecessary |
Compared with MAX6831SZUT-T, MAX6829SZUT-T provides identical dual-supply monitoring but lacks open-drain flexibility, while TPS3808G33DBVR omits VCC2 supervision entirely-making MAX6831SZUT-T uniquely suited for multivoltage systems requiring coordinated reset and watchdog coverage across two rails.
Availability
MAX6831SZUT-T is available at Aetrix Electronics and suitable for portable/battery-powered equipment, automotive systems, and multivoltage embedded controllers requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6831SZUT-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 and mixed-signal ICs for power, sensing, and connectivity applications, with emphasis on high-reliability industrial and automotive markets.
The MAX6826–MAX6831 family was developed specifically for ultra-low-voltage dual-rail microprocessor supervision in space-constrained, battery-sensitive, and thermally demanding environments-delivering guaranteed reset validity down to VCC = +1.0V in a 6-pin SOT23 package.
FAQ
What is the exact VCC2 reset threshold voltage for MAX6831SZUT-T?
The MAX6831SZUT-T has a factory-trimmed VCC2 reset threshold of 1.313V ±1.5% over -40°C to +125°C. This value is specified in the Electrical Characteristics table under "VCC2 Reset Threshold" for suffix 'H' (corresponding to MAX6831), and is validated across temperature and process variation-not derived from external resistors or user adjustment.
Does MAX6831SZUT-T support manual reset assertion, and how is it implemented?
Yes, MAX6831SZUT-T supports manual reset via the MR pin (Pin 3), which is active-low with an internal 50kΩ pull-up to VCC. Pulling MR to GND forces reset assertion for the duration of the low pulse plus the full 140ms minimum timeout period. No external components are needed, and MR accepts CMOS logic levels or open-drain signals.
What is the watchdog timeout behavior of MAX6831SZUT-T, and how is it cleared?
The MAX6831SZUT-T features a 1.6s nominal watchdog timeout period. The internal timer clears on any rising or falling edge at the WDI pin (Pin 4), on MR assertion, or during active RESET. If WDI remains static beyond 1.6s, reset is asserted for the full timeout period. Leaving WDI unconnected disables the watchdog function.
Can MAX6831SZUT-T monitor a 1.2V supply, and what is the accuracy?
Yes, MAX6831SZUT-T can monitor a 1.2V supply via its VCC2 pin, as its factory-trimmed threshold is 1.313V ±1.5% - covering 1.2V systems with margin. For tighter 1.2V monitoring, use the 'G' suffix variant (1.110V threshold). Accuracy is guaranteed over -40°C to +125°C per the datasheet's VCC2 specification table.
What package type and lead finish does MAX6831SZUT-T use?
MAX6831SZUT-T uses a 6-pin SOT23-6 package (JEDEC MO-178AB) with gull-wing leads and 1.27mm pitch. The '-T' suffix indicates lead-free (RoHS-compliant) matte tin finish; leaded versions use '-T' without the '+' prefix, though lead-free is standard for new designs.
MAX6831SZUT-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:
- 2.313V, 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-23-6
MAX6831SZUT-T FAQ
1.How can I place an order for MAX6831SZUT-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6831SZUT-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 MAX6831SZUT-T reliable?
The price and inventory of MAX6831SZUT-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6831SZUT-T is usually 5 days.
3.What payment methods are accepted for MAX6831SZUT-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6831SZUT-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6831SZUT-T?
MAX6831SZUT-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6831SZUT-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 MAX6831SZUT-T?
For technical support, including MAX6831SZUT-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6831SZUT-T requirements.
6.How does Aetrix verify that MAX6831SZUT-T is sourced from the original manufacturer or authorized distributors?
All MAX6831SZUT-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 MAX6831SZUT-T meets industry standards.
7.What is the process for return or replacement of MAX6831SZUT-T?
All MAX6831SZUT-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6831SZUT-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 MAX6831SZUT-T part is unused and in its original packaging.
Return procedure for MAX6831SZUT-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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