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Analog Devices Inc./Maxim Integrated MAX6831SDUT-T
- Part No.:
- MAX6831SDUT-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-6
- Datasheet:
-
MAX6831SDUT-T.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:7,500
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Product details
Overview
MAX6831SDUT-T from Maxim Integrated is an ultra-low-voltage dual microprocessor supervisory IC in 6-pin SOT23 package, monitoring primary supply (VCC) at 2.93V and secondary supply (VCC2) at 2.188V with open-drain active-low RESET output, 140ms min reset timeout, and 1.6s watchdog timer - used in battery-powered embedded controllers requiring reliable brownout detection and system-level reset coordination.
For engineers reviewing the MAX6831SDUT-T datasheet, MAX6831SDUT-T pinout, MAX6831SDUT-T application, or MAX6831SDUT-T equivalent, this page delivers verified functional identity, exact threshold voltages per suffix, open-drain reset behavior, watchdog timing accuracy across temperature, and validated alternative options for multivoltage µP monitoring systems.
Technical Context
The MAX6831SDUT-T implements dual independent voltage monitoring: VCC threshold fixed at 2.93V (S-suffix), VCC2 threshold factory-trimmed to 2.188V (Y-suffix), both referenced to internal 1.26V bandgap. It uses a dedicated comparator for each supply and a shared watchdog timer with edge-triggered clearing logic.
Its open-drain RESET output supports bidirectional µP reset pins (e.g., Motorola 68HC11), requires external pullup, and remains valid down to VCC = +1.0V. The device integrates manual reset with 50kΩ internal pullup, glitch rejection (100ns), and no external components required for basic operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Reset Threshold | 2.93V (S-suffix), ±0.025V over -40°C to +125°C - sets precise power-up sequencing point for 3.3V I/O rails |
| VCC2 Reset Threshold | 2.188V (Y-suffix), ±0.025V over -40°C to +125°C - monitors 2.5V core or auxiliary supply without external resistor divider |
| Reset Timeout Period | 140ms minimum, 320ms maximum over full temperature range - ensures µP completes boot initialization before release |
| Watchdog Timeout | 1.6s nominal, 0.8–2.6s over -40°C to +125°C - provides deterministic software execution supervision for real-time firmware |
| Supply Current (VCC) | 7µA typical at +3.6V, 25µA max at -40°C to +125°C - enables multi-year operation in coin-cell–powered portable instruments |
| RESET Output Type | Open-drain, <0.3V @ 100µA sink - allows wired-OR reset bus sharing and compatibility with bidirectional µP reset I/O |
| Operating Voltage Range | +1.2V to +5.5V on VCC, +0.9V to +2.5V on VCC2 - supports ultralow-voltage SoC domains including sub-1.2V logic cores |
Pinout & Package
Package: 6-pin SOT23 (U6+1 outline, land pattern 90-0175), RoHS-compliant, -40°C to +125°C operating range.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Active-low open-drain reset output; requires external pullup; asserts low during VCC/VCC2 undervoltage, MR low, or WDI timeout |
| 2 | GND | Ground reference for all internal comparators, timers, and I/O - must be low-impedance connection to system ground plane |
| 3 | MR | Manual-reset input, active-low, internally pulled up to VCC at 50kΩ; 1µs minimum pulse width; immune to <100ns noise glitches |
| 4 | WDI | Watchdog input; toggling edge clears 1.6s timer; unconnected or three-stated disables watchdog; 50ns minimum detectable pulse width |
| 5 | VCC2 | Secondary supply input; factory-trimmed comparator threshold = 2.188V (Y-suffix); monitors 2.5V/1.8V rails without external components |
| 6 | VCC | Primary supply input; S-suffix threshold = 2.93V; powers internal circuitry and references RESET IN comparator at 0.63V |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent voltage monitoring | Simultaneous VCC (2.93V) and VCC2 (2.188V) supervision with separate comparators - eliminates need for discrete supervisors or resistor dividers |
| Open-drain RESET with guaranteed validity | Valid low-state output down to VCC = +1.0V - ensures deterministic reset assertion even during deep brownout conditions |
| Immunity to negative VCC transients | No false reset for ≤20µs transients 100mV below threshold - prevents spurious resets in noisy industrial or automotive environments |
| Factory-trimmed VCC2 threshold | 2.188V ±0.025V over full temperature range - achieves 0.5% accuracy without calibration or trimming resistors |
| No external components required | Internal 50kΩ MR pullup, precision bandgap reference, and edge-triggered WDI - reduces BOM count and PCB area vs. discrete solutions |
Applications
| Portable/Battery-Powered Equipment | Embedded Controllers |
|---|---|
Use Scenario: Handheld test meters powered by single Li-ion cell with 3.3V and 2.5V LDO outputs. IC Role / Device Role: Dual-supply supervisor asserting open-drain RESET to ARM Cortex-M0 MCU during battery sag below 2.93V or 2.188V. Use Value: Prevents corrupted EEPROM writes and sensor data loss by holding MCU in reset until both rails stabilize above thresholds. |
Use Scenario: Industrial PLC I/O module with isolated 3.3V communication rail and 2.5V FPGA configuration rail. IC Role / Device Role: Monitors both rails and triggers watchdog reset if FPGA fails to toggle WDI due to firmware hang. Use Value: Enables autonomous recovery without host intervention, reducing field service calls and downtime. |
| Intelligent Instruments | Critical µP Monitoring |
Use Scenario: Portable gas analyzer using low-power µC with 1.8V core and 3.3V analog front-end. IC Role / Device Role: Supervises 3.3V VCC (S-suffix) and 2.5V VCC2 (Y-suffix) while providing manual reset via front-panel button (MR). Use Value: Guarantees clean startup sequence and allows user-initiated recalibration reset without power cycle. |
Use Scenario: Medical infusion pump controller requiring fail-safe reset during power interruption. IC Role / Device Role: Provides redundant reset assertion via VCC/VCC2 monitoring and watchdog, with open-drain output tied to safety-critical reset bus. Use Value: Meets IEC 62304 Class C requirements by ensuring reset remains asserted until both supplies exceed thresholds and timeout expires. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-supply µP monitoring applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6830SDUT-T | Push-pull active-high RESET output instead of open-drain active-low; identical VCC/VCC2 thresholds and timing | Requires level-shifting or redesign for µPs with active-low reset inputs; unsuitable for wired-OR reset buses | Select when interfacing with µPs having dedicated active-high reset pins and no shared reset bus requirement |
| TPS3808G33DBVR | Single-supply monitor (3.3V only), no VCC2 input; 200ms reset timeout; push-pull active-low RESET | Cannot monitor secondary 2.5V rail; lacks watchdog and manual reset inputs; requires external components for dual-rail use | Use only if system has single 3.3V rail and no watchdog/manual reset functionality needed |
Compared with MAX6831SDUT-T, MAX6830SDUT-T offers push-pull drive but loses open-drain flexibility, while TPS3808G33DBVR reduces cost and complexity at the expense of dual-rail monitoring, watchdog, and manual reset capability - making MAX6831SDUT-T uniquely suited for compact, multivoltage, safety-critical embedded systems.
Availability
MAX6831SDUT-T is available at Aetrix Electronics and suitable for portable/battery-powered equipment, embedded controllers, intelligent instruments, critical µP monitoring, and multivoltage systems requiring stable component supply with guaranteed long-term sourcing.
Supply support for MAX6831SDUT-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 targets ultra-low-voltage microprocessor supervision in space-constrained, battery-sensitive systems - delivering dual-rail monitoring, watchdog, and manual reset in a 6-pin SOT23 footprint.
FAQ
What is the exact VCC and VCC2 reset threshold voltage for MAX6831SDUT-T?
The MAX6831SDUT-T has a VCC reset threshold of 2.93V (S-suffix) and a VCC2 reset threshold of 2.188V (Y-suffix), both specified over -40°C to +125°C with ±0.025V tolerance. These values are factory-trimmed and do not require external calibration. The MAX6831SDUT-T uses separate internal comparators for each rail, ensuring independent and simultaneous monitoring without interaction.
Does MAX6831SDUT-T support watchdog functionality, and what is its timeout accuracy?
Yes, MAX6831SDUT-T includes a watchdog timer with a nominal timeout of 1.6s. Its actual range is 0.8s to 2.6s across -40°C to +125°C, and it clears on any rising or falling edge at WDI. The MAX6831SDUT-T watchdog is edge-triggered, not level-sensitive, enabling robust software supervision even under clock jitter or timing uncertainty.
How does the open-drain RESET output of MAX6831SDUT-T interface with bidirectional µP reset pins?
The MAX6831SDUT-T's open-drain RESET output connects directly to bidirectional µP reset pins (e.g., Motorola 68HC11) using a single external pullup resistor. This configuration allows the µP to drive the line low during its own reset initiation while the MAX6831SDUT-T asserts reset during power faults - eliminating contention and enabling true bidirectional control without additional logic.
Can MAX6831SDUT-T monitor a 1.8V supply on VCC2?
No - MAX6831SDUT-T is configured with Y-suffix VCC2 threshold of 2.188V, optimized for 2.5V rails. To monitor 1.8V, select MAX6831WDUT-T (W-suffix, 1.665V) or MAX6831VDUT-T (V-suffix, 1.575V). The MAX6831SDUT-T's VCC2 input is factory-trimmed and not adjustable; using it on 1.8V would result in permanent reset assertion.
What is the minimum VCC voltage at which MAX6831SDUT-T guarantees valid RESET output operation?
MAX6831SDUT-T guarantees valid RESET output down to VCC = +1.0V across -40°C to +125°C. Below this, the internal comparators and timer may not function reliably. The open-drain RESET remains low (asserted) as long as VCC stays below 1.0V, ensuring fail-safe behavior during deep brownout - a key reliability feature confirmed in the device's Absolute Maximum Ratings and Electrical Characteristics tables.
MAX6831SDUT-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:
- 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-23-6
MAX6831SDUT-T FAQ
1.How can I place an order for MAX6831SDUT-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6831SDUT-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 MAX6831SDUT-T reliable?
The price and inventory of MAX6831SDUT-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6831SDUT-T is usually 5 days.
3.What payment methods are accepted for MAX6831SDUT-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6831SDUT-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6831SDUT-T?
MAX6831SDUT-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6831SDUT-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 MAX6831SDUT-T?
For technical support, including MAX6831SDUT-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6831SDUT-T requirements.
6.How does Aetrix verify that MAX6831SDUT-T is sourced from the original manufacturer or authorized distributors?
All MAX6831SDUT-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 MAX6831SDUT-T meets industry standards.
7.What is the process for return or replacement of MAX6831SDUT-T?
All MAX6831SDUT-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6831SDUT-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 MAX6831SDUT-T part is unused and in its original packaging.
Return procedure for MAX6831SDUT-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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