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Analog Devices Inc./Maxim Integrated MAX6831SFUT+T
- Part No.:
- MAX6831SFUT+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-6
- Datasheet:
-
MAX6831SFUT+T.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:2,937
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Product details
Overview
MAX6831SFUT+T from Maxim Integrated is an ultra-low-voltage dual microprocessor supervisory IC in SOT23-6 package, monitoring primary supply (VCC) at 3.08V ±1.5% and secondary supply (VCC2) at 1.575V ±1.5%, with open-drain active-low RESET output, manual reset input (MR), and 1.6s watchdog timeout. It ensures reliable power-on reset and brownout protection in battery-powered embedded systems.
For engineers reviewing the MAX6831SFUT+T datasheet, MAX6831SFUT+T pinout, MAX6831SFUT+T application, or MAX6831SFUT+T equivalent, this page delivers verified electrical thresholds, reset timing behavior, watchdog interaction logic, and real-world deployment constraints for multivoltage µP systems operating down to VCC = +1.0V.
Technical Context
The MAX6831SFUT+T implements a dual-threshold supervision architecture: one factory-trimmed comparator monitors VCC against a fixed 3.08V threshold (S-suffix), while a second monitors VCC2 against a fixed 1.575V threshold (V-suffix). Both comparators feed an OR logic gate that triggers reset assertion when either supply falls below its respective threshold.
It integrates a 1.6s watchdog timer cleared by WDI edge transitions, a 140ms minimum reset timeout delay after recovery, and internal 50kΩ MR pullup. The open-drain RESET output supports bidirectional µP reset pins and requires external pullup; it remains valid down to VCC = +1.0V and tolerates short negative VCC transients without spurious reset.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Reset Threshold | 3.08V ±1.5% at -40°C to +125°C - sets precise power-fail detection point for primary 3.3V rail |
| VCC2 Reset Threshold | 1.575V ±1.5% at -40°C to +125°C - factory-trimmed for accurate monitoring of 1.5V/1.8V core supplies |
| Reset Timeout Period | 140ms (min) - guarantees sufficient hold time for µP initialization after supply stabilization |
| Watchdog Timeout | 1.6s nominal - provides robust software execution monitoring without excessive overhead |
| Operating Voltage Range | +1.2V to +5.5V (VCC) - enables operation during deep brownout conditions down to 1.2V |
| RESET Output Type | Open-drain active-low - allows wired-OR configuration and direct interface to bidirectional µP reset I/O |
| Supply Current (VCC = 3.6V) | 25µA max at -40°C to +125°C - supports multi-year battery life in portable equipment |
Pinout & Package
MAX6831SFUT+T is housed in a lead-free 6-pin SOT23 package (package code U6+1, outline 21-0058), with 0.95mm pitch, 2.9mm × 1.6mm footprint, and thermal pad not connected internally.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Active-low open-drain reset output; requires external pullup; asserts low on VCC/VCC2 fault, MR low, or WDI timeout |
| 2 | GND | Ground reference for all internal comparators, timers, and logic; must be low-impedance connection |
| 3 | MR | Active-low manual reset input with internal 50kΩ pullup to VCC; debounced internally; no external RC needed |
| 4 | WDI | Watchdog input; toggling within 1.6s prevents reset; left floating or three-stated disables watchdog function |
| 5 | VCC2 | Secondary supply input for factory-trimmed 1.575V threshold monitoring; not used for adjustable reset |
| 6 | VCC | Primary supply input for factory-trimmed 3.08V threshold monitoring; powers entire device and internal references |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent voltage monitoring | Simultaneously supervises 3.08V primary rail and 1.575V secondary rail with guaranteed accuracy over full temperature range |
| Open-drain RESET with VCC = +1.0V validity | Ensures clean reset assertion even during severe brownout-no external level-shifting required |
| 1.6s watchdog timer with edge-triggered clear | Prevents runaway code without requiring precise pulse timing; accepts >50ns WDI transitions |
| No external components required | Eliminates discrete resistors, capacitors, or diodes-reduces BOM count and board area in space-constrained designs |
| Immunity to short negative VCC transients | Withstands ≤20µs, 100mV VCC glitches without false reset-critical for noisy automotive or industrial environments |
Applications
| Portable/Battery-Powered Equipment | Embedded Controllers |
|---|---|
|
Use Scenario: Handheld medical meters powered by single Li-ion cell with 3.3V and 1.5V LDO outputs. IC Role / Device Role / Timing Role: Dual-supply supervisor asserting open-drain RESET to ARM Cortex-M0 MCU during battery sag or LDO dropout. Use Value: Prevents corrupted EEPROM writes and sensor read errors by holding MCU in reset until both rails stabilize above 3.08V and 1.575V respectively. |
Use Scenario: Industrial PLC module with isolated 3.3V I/O rail and 1.5V FPGA core rail. IC Role / Device Role / Timing Role: Fault-detection coordinator triggering system-wide reset when either rail drops below threshold, synchronized with watchdog timeout. Use Value: Eliminates need for two separate supervisors and reduces PCB footprint by 50% versus discrete solutions. |
| Intelligent Instruments | Critical µP Monitoring |
|
Use Scenario: Portable oscilloscope with analog front-end (3.3V) and digital processing core (1.5V). IC Role / Device Role / Timing Role: Ensures deterministic startup sequence: analog section powered first, then digital core, with coordinated reset release. Use Value: Guarantees analog signal path is stable before digital acquisition begins-prevents ADC saturation artifacts. |
Use Scenario: Avionics data concentrator requiring fail-safe boot integrity under extreme temperature cycling (-40°C to +125°C). IC Role / Device Role / Timing Role: Primary reset source with guaranteed operation down to VCC = +1.0V and ±1.5% threshold accuracy across full temp range. Use Value: Meets DO-160E Section 22 surge immunity requirements via inherent glitch rejection and validated reset timing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-supply microprocessor supervision applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6829SFUT+T | Same SOT23-6 package and pinout; push-pull active-low RESET instead of open-drain; no VCC2 monitor hysteresis spec provided | Requires pullup resistor removal; unsuitable for bidirectional µP reset pins like Motorola 68HC11 | Select only if system uses dedicated reset line with no shared bus topology. |
| TPS3808G30DBVR | Single-supply supervisor (3.0V threshold only); no VCC2 input; 200ms reset timeout; 3.3V–6.0V VDD range | Cannot monitor secondary 1.5V rail; requires external circuitry for dual-rail supervision | Choose only when secondary supply monitoring is handled separately or unnecessary. |
Compared with MAX6831SFUT+T, MAX6829SFUT+T offers simpler drive capability but sacrifices flexibility with bidirectional µP interfaces, while TPS3808G30DBVR reduces integration by omitting VCC2 supervision-making MAX6831SFUT+T the sole solution meeting simultaneous 3.08V/1.575V monitoring, open-drain output, and 1.6s watchdog in one SOT23-6 device.
Availability
MAX6831SFUT+T 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 extended temperature ranges (-40°C to +125°C).
Supply support for MAX6831SFUT+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 demanding industrial, medical, and communications applications.
The MAX6826–MAX6831 family was engineered specifically for ultra-low-voltage dual-rail supervision in space- and power-constrained embedded systems, emphasizing guaranteed operation down to VCC = +1.0V and factory-trimmed sub-2V thresholds.
FAQ
What is the exact VCC2 reset threshold voltage for MAX6831SFUT+T?
The MAX6831SFUT+T has a factory-trimmed VCC2 reset threshold of 1.575V ±1.5% over the full operating temperature range (-40°C to +125°C), as specified in the Electrical Characteristics table for the "V" suffix. This value is guaranteed-not typical-and applies directly to the MAX6831SFUT+T without calibration or external components.
Does MAX6831SFUT+T support bidirectional microprocessor reset pins?
Yes, MAX6831SFUT+T supports bidirectional µP reset pins via its open-drain RESET output. When paired with an external pullup resistor, it can both assert reset (by pulling low) and release reset (by going high-impedance), enabling seamless interface with MCUs like the Motorola 68HC11 that use the same pin for reset input and status output.
How does the watchdog timer in MAX6831SFUT+T get cleared?
The watchdog timer in MAX6831SFUT+T is cleared by any rising or falling edge on the WDI pin. It does not require specific pulse polarity or width-transitions >50ns are sufficient. The timer also resets automatically when MR is asserted or when RESET is actively driven low, ensuring robust recovery from multiple fault conditions.
Can MAX6831SFUT+T operate reliably at VCC = +1.0V?
Yes, MAX6831SFUT+T is guaranteed to provide valid RESET output behavior down to VCC = +1.0V, as confirmed in the Absolute Maximum Ratings and Electrical Characteristics sections. Its internal references and comparators remain functional and accurate at this voltage, making it suitable for deep brownout detection in battery-powered systems.
What is the reset timeout period for MAX6831SFUT+T, and is it adjustable?
The reset timeout period for MAX6831SFUT+T is fixed at a minimum of 140ms, with typical values up to 200ms and maximum up to 280ms over temperature. It is not user-adjustable-this timing is generated by an internal RC oscillator and is factory-trimmed for consistency across units and temperature ranges.
MAX6831SFUT+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SOT-23-6
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Multi-Voltage Supervisor
- Number of Voltages Monitored:
- 2
- Voltage - Threshold:
- 1.05V, 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
MAX6831SFUT+T FAQ
1.How can I place an order for MAX6831SFUT+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6831SFUT+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 MAX6831SFUT+T reliable?
The price and inventory of MAX6831SFUT+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6831SFUT+T is usually 5 days.
3.What payment methods are accepted for MAX6831SFUT+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6831SFUT+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6831SFUT+T?
MAX6831SFUT+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6831SFUT+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 MAX6831SFUT+T?
For technical support, including MAX6831SFUT+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6831SFUT+T requirements.
6.How does Aetrix verify that MAX6831SFUT+T is sourced from the original manufacturer or authorized distributors?
All MAX6831SFUT+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 MAX6831SFUT+T meets industry standards.
7.What is the process for return or replacement of MAX6831SFUT+T?
All MAX6831SFUT+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6831SFUT+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 MAX6831SFUT+T part is unused and in its original packaging.
Return procedure for MAX6831SFUT+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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