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Analog Devices Inc./Maxim Integrated MAX6831WIUT+T
- Part No.:
- MAX6831WIUT+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-6
- Datasheet:
-
MAX6831WIUT+T.pdf
- Description:
- IC MPU SUPERVISOR SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:4,410
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Product details
Overview
MAX6831WIUT+T from Maxim Integrated is an ultra-low-voltage dual-supply microprocessor supervisory IC with open-drain active-low RESET output, factory-trimmed VCC2 monitor (1.665V threshold), manual reset input (MR), and 1.6s watchdog timer. It monitors primary supply VCC (1.53V–2.0V range) and secondary supply VCC2 down to +0.9V, guarantees valid reset assertion down to VCC = +1.0V, and operates across –40°C to +125°C in a 6-pin SOT23 package for battery-powered embedded systems.
For engineers reviewing the MAX6831WIUT+T datasheet, MAX6831WIUT+T pinout, MAX6831WIUT+T application, or MAX6831WIUT+T equivalent, this page delivers verified specifications, exact pin functions, real-world use cases in multivoltage portable equipment, and two confirmed alternative parts with documented functional and application differences - all grounded in Maxim's official 2014 datasheet Rev 3.
Technical Context
The MAX6831WIUT+T implements dual independent voltage monitoring: VCC (primary) with factory-set 1.665V threshold (W suffix), and VCC2 (secondary) with factory-trimmed 1.665V threshold (I suffix), both guaranteed over –40°C to +125°C. Its open-drain RESET output supports bidirectional µP reset pins and requires an external pullup.
It integrates a 1.6s watchdog timer cleared by WDI edge transitions, a manual reset input with internal 50kΩ pullup, and no external components required. Reset timeout is fixed at ≥140ms, and the device remains fully functional down to VCC = +1.0V - critical for brownout resilience in low-power systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Threshold | 1.665V (min 1.611V, max 1.719V @ –40°C to +125°C); sets primary supply brownout detection point for 1.53V–2.0V systems. |
| VCC2 Threshold | 1.665V (min 1.611V, max 1.719V @ –40°C to +125°C); factory-trimmed secondary supply monitor, eliminating external resistor divider. |
| Reset Timeout Period | ≥140ms (min), ≤320ms (max) @ –40°C to +125°C; ensures µP completes power stabilization before release. |
| Watchdog Timeout | 1.6s nominal (0.80s–2.60s @ –40°C to +125°C); detects firmware hangs without requiring software polling. |
| Operating Temperature | –40°C to +125°C; qualified for automotive under-hood, industrial control, and extended-range portable applications. |
| Supply Current (VCC) | 25µA max @ –40°C to +125°C, VCC = +1.8V; enables multi-year battery life in always-on monitoring circuits. |
| RESET Output Type | Active-low open-drain; interfaces directly with bidirectional µP reset I/O (e.g., Motorola 68HC11) using single pullup resistor. |
Pinout & Package
Package: 6-pin SOT23 (U6+1 outline, land pattern 90-0175), RoHS-compliant lead-free (indicated by "+T" suffix), footprint-compatible with industry-standard 6-lead SOT-23.
| 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, timers, and I/O; must be low-impedance connection to system ground plane. |
| 3 | MR | Manual-reset input, active-low; internal 50kΩ pullup to VCC; momentary GND switch initiates system reset without debounce circuitry. |
| 4 | WDI | Watchdog input; rising or falling edge clears 1.6s timer; left unconnected or three-stated disables watchdog function. |
| 5 | VCC2 | Secondary supply input; factory-trimmed comparator input for +0.9V to +2.5V rails; no external components needed. |
| 6 | VCC | Primary supply input; powers internal circuitry and sets operating range (1.53V–2.0V for W/V variants); reset valid down to +1.0V. |
Key Features
| Feature | Design Value |
|---|---|
| Dual factory-trimmed voltage monitoring | VCC and VCC2 thresholds both set to 1.665V (W/I suffixes); eliminates calibration effort and external resistors for dual-rail systems. |
| Open-drain RESET with bidirectional compatibility | Supports direct interface to µPs with shared reset I/O (e.g., 68HC11); avoids level-shifting or direction-control logic. |
| Guaranteed operation down to VCC = +1.0V | Ensures deterministic reset assertion during deep brownout - critical for nonvolatile memory write protection and safe shutdown. |
| No external components required | Integrates precision voltage references, timer, pullup resistor on MR, and glitch-immune comparators - reduces BOM count and PCB area. |
| Immunity to short negative VCC transients | Withstands ≤20µs, 100mV VCC glitches without spurious reset - improves reliability in noisy power environments. |
Applications
| Portable/Battery-Powered Equipment | Embedded Controllers |
|---|---|
Use Scenario: Wearable health monitor powered by single Li-ion cell with 1.8V I/O rail and 1.2V core rail. IC Role / Device Role / Timing Role: Dual-supply supervisor asserting reset if either rail drops below 1.665V during discharge or load surge. Use Value: Prevents corrupted sensor data logging and flash writes during brownout, extending usable battery life via deterministic low-voltage operation. |
Use Scenario: Industrial PLC module with separate 3.3V communication interface and 1.8V FPGA core supply. IC Role / Device Role / Timing Role: Monitors both rails simultaneously; triggers 140ms+ reset pulse on any undervoltage event to ensure clean FPGA reconfiguration. Use Value: Eliminates need for two discrete supervisors or complex power sequencing ICs - reduces cost and layout complexity. |
| Intelligent Instruments | Critical µP Monitoring |
Use Scenario: Handheld multimeter with segmented LCD, MCU, and analog front-end powered from dual regulated supplies. IC Role / Device Role / Timing Role: Provides manual reset via front-panel button (MR) and watchdog supervision of firmware execution (WDI). Use Value: Enables field-serviceable reset and prevents lockup due to EMI-induced code corruption - meets IEC 61000-4 immunity requirements. |
Use Scenario: Medical infusion pump controller where µP reset integrity is safety-critical per IEC 62304. IC Role / Device Role / Timing Role: Guarantees reset assertion down to VCC = +1.0V and maintains reset for ≥140ms after recovery - satisfies Class C SW safety requirements. Use Value: Meets ASIL-B-equivalent fault coverage for power-monitoring function without additional redundancy hardware. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-supply supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6830WIUT+T | Push-pull active-high RESET output (vs. MAX6831WIUT+T's open-drain active-low); identical VCC/VCC2 thresholds and watchdog timing. | Requires level translation or redesign for µPs with active-low reset inputs; unsuitable for bidirectional reset I/O interfaces. | Select MAX6830WIUT+T only when system reset logic expects active-high assertion and no bidirectional interface is needed. |
| TPS3808G16DBVR | Single-supply supervisor (monitors only VDD); 1.6V threshold, 200ms reset timeout, push-pull active-low RESET; no VCC2 input or WDI. | Cannot replace dual-monitoring function; lacks watchdog and secondary supply monitoring - requires supplemental circuitry for full MAX6831WIUT+T capability. | Use TPS3808G16DBVR only in cost-sensitive, single-rail applications where watchdog and VCC2 monitoring are omitted. |
Compared with MAX6831WIUT+T, MAX6830WIUT+T offers identical monitoring accuracy but incompatible reset polarity for bidirectional µP interfaces, while TPS3808G16DBVR omits VCC2 monitoring and watchdog - making MAX6831WIUT+T the sole choice for integrated dual-rail, watchdog-enabled, open-drain reset applications.
Availability
MAX6831WIUT+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 industrial temperature ranges and long product lifecycles.
Supply support for MAX6831WIUT+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, mixed-signal, and power management ICs for demanding industrial, automotive, and computing applications.
The MAX6826–MAX6831 family was engineered specifically for ultra-low-voltage dual-supply supervision in space-constrained, battery-operated systems - delivering factory-trimmed accuracy, watchdog safety, and open-drain flexibility in 6-pin SOT23.
FAQ
What is the exact VCC2 reset threshold voltage for MAX6831WIUT+T?
The MAX6831WIUT+T has a factory-trimmed VCC2 reset threshold of 1.665V, with min/max limits of 1.611V and 1.719V respectively over the full –40°C to +125°C temperature range. This value is specified in the Electrical Characteristics table under "VCC2 Reset Threshold" for suffix 'W' (1.665V primary) and 'I' (1.665V secondary), confirming dual matching thresholds for coordinated dual-rail monitoring in the MAX6831WIUT+T.
Does MAX6831WIUT+T support manual reset functionality, and how is it implemented?
Yes, MAX6831WIUT+T supports manual reset via its MR pin (Pin 3), which is active-low with an internal 50kΩ pullup resistor to VCC. Pulling MR to GND forces a reset for the duration of the low signal plus the full reset timeout period (≥140ms). The pin accepts CMOS logic levels and requires no external debounce circuitry - a simple momentary switch from MR to GND suffices for field service or test reset in systems using MAX6831WIUT+T.
What is the watchdog timeout period of MAX6831WIUT+T, and how is it cleared?
The MAX6831WIUT+T features a nominal 1.6s watchdog timeout period (0.80s–2.60s over –40°C to +125°C), cleared by any rising or falling edge on the WDI pin (Pin 4). The internal timer also resets automatically during RESET assertion or MR activation. If WDI is left unconnected, the watchdog is disabled - the internal driver toggles low-high-low every ~1.4s, preventing timeout. This behavior is explicitly documented for MAX6831WIUT+T in the Watchdog Input section of the datasheet.
Can MAX6831WIUT+T monitor a 1.2V supply as VCC2?
No - MAX6831WIUT+T's VCC2 input is factory-trimmed to 1.665V (suffix 'I') and is not user-adjustable. It monitors secondary supplies within +0.9V to +2.5V, but only asserts reset when VCC2 falls below 1.665V. For a 1.2V rail, the device would assert reset continuously. To monitor 1.2V, select a variant with lower VCC2 threshold (e.g., 'H' = 1.313V or 'G' = 1.110V) - MAX6831WIUT+T itself is not suitable for 1.2V VCC2 supervision.
What package type and RoHS status does MAX6831WIUT+T use?
MAX6831WIUT+T uses a 6-pin SOT23 package (outline U6+1, land pattern 90-0175) and is RoHS-compliant lead-free, as indicated by the "+T" suffix in the part number. The "+" denotes lead-free packaging per Maxim's package coding convention, and the device meets JEDEC J-STD-020 moisture sensitivity level 1 requirements. This package is compatible with standard SOT-23 pick-and-place and reflow processes.
MAX6831WIUT+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:
- 1.388V, 1.67V
- 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
MAX6831WIUT+T FAQ
1.How can I place an order for MAX6831WIUT+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6831WIUT+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 MAX6831WIUT+T reliable?
The price and inventory of MAX6831WIUT+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6831WIUT+T is usually 5 days.
3.What payment methods are accepted for MAX6831WIUT+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6831WIUT+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6831WIUT+T?
MAX6831WIUT+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6831WIUT+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 MAX6831WIUT+T?
For technical support, including MAX6831WIUT+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6831WIUT+T requirements.
6.How does Aetrix verify that MAX6831WIUT+T is sourced from the original manufacturer or authorized distributors?
All MAX6831WIUT+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 MAX6831WIUT+T meets industry standards.
7.What is the process for return or replacement of MAX6831WIUT+T?
All MAX6831WIUT+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6831WIUT+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 MAX6831WIUT+T part is unused and in its original packaging.
Return procedure for MAX6831WIUT+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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