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Analog Devices Inc./Maxim Integrated MAX6731AUTSD3+T
- Part No.:
- MAX6731AUTSD3+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-6
- Datasheet:
-
MAX6731AUTSD3+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:1,755
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Product details
Overview
MAX6731AUTSD3+T from Maxim Integrated is a single-voltage microprocessor supervisor IC with push-pull active-low reset output, manual reset input, and independent push-pull watchdog output. It monitors one fixed supply (VCC1) at +3.075V nominal threshold, provides 140ms–280ms reset timeout, operates from -40°C to +125°C, and draws only 14µA typical supply current at +3.6V - used in telecom power sequencing and embedded controller reset management.
For engineers reviewing the MAX6731AUTSD3+T datasheet, MAX6731AUTSD3+T pinout, MAX6731AUTSD3+T application, or MAX6731AUTSD3+T equivalent, this page delivers verified electrical parameters, confirmed SOT23-6 pin mapping, real-world multivoltage system use cases, and two validated alternative parts with documented functional and timing differences.
Technical Context
The MAX6731AUTSD3+T implements a dual-mode watchdog timer: a 35s minimum startup delay after reset enables full system initialization, followed by a 1.12s minimum normal-mode timeout for rapid fault detection. Its reset logic asserts RST low when VCC1 falls below +3.075V (±1.5% over temperature), with 45µs propagation delay and guaranteed validity down to VCC1 = +0.8V.
It features a dedicated manual reset input (MR) with 50kΩ internal pullup, 1µs minimum pulse width, and 100ns glitch rejection. The push-pull RST and WDO outputs drive directly into µP reset pins without external pullups, supporting bidirectional reset I/O via a 10kΩ series resistor to prevent contention.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC1 Reset Threshold | +3.075V (nominal), ±1.5% over -40°C to +125°C - sets precise brownout detection point for primary supply |
| Reset Timeout Period | 140ms–280ms (D3 suffix) - ensures sufficient hold time for processor boot and peripheral initialization |
| Watchdog Timeout | 35s min startup delay, 1.12s min normal mode - accommodates long boot sequences then enforces tight software execution monitoring |
| Supply Current | 14µA typical at +3.6V - enables battery-backed operation in portable equipment with minimal quiescent drain |
| Operating Temperature | -40°C to +125°C - qualified for under-hood automotive, industrial control, and telecom base station environments |
| RST Output Type | Active-low push-pull - eliminates need for external pullup resistor and supports direct connection to most µP reset inputs |
| MR Input Logic | CMOS-compatible with 0.3×VCC1/0.7×VCC1 thresholds and internal 50kΩ pullup - simplifies manual reset switch interface |
Pinout & Package
MAX6731AUTSD3+T is housed in a 6-pin SOT23-6 package (U6-1), measuring 2.9mm × 1.6mm × 1.1mm, with gull-wing leads and RoHS-compliant lead-free finish (+T suffix).
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RST | Active-low push-pull reset output - asserts low on VCC1 undervoltage, MR assertion, or watchdog timeout; drives µP reset directly |
| 2 | GND | Ground reference for all internal comparators and outputs - must be connected to system ground plane for stable threshold accuracy |
| 3 | WDO | Active-low push-pull watchdog output - signals processor lockup independently of reset; deasserts immediately when WDI transitions |
| 4 | MR | Active-low manual reset input - forces RST assertion when pulled low; internal 50kΩ pullup allows floating if unused |
| 5 | WDI | Watchdog input - requires rising/falling edge within timeout period to prevent WDO assertion; floating does not disable watchdog |
| 6 | VCC1 | Primary supply voltage input - powers device and feeds VCC1 monitor; valid operation guaranteed down to +0.8V |
Key Features
| Feature | Design Value |
|---|---|
| Dual-mode watchdog timer | 35s startup delay + 1.12s normal timeout - prevents false resets during boot while enabling fast hang detection in runtime |
| Push-pull RST and WDO outputs | No external pullup required - reduces BOM count and PCB footprint vs. open-drain alternatives |
| Guaranteed reset validity to +0.8V | Ensures clean reset assertion even during deep brownout - critical for deterministic recovery in power-constrained systems |
| Immunity to short VCC transients | Rejects glitches <10µs at 75mV overdrive - eliminates spurious resets from switching noise or load transients |
| Low 14µA supply current | Enables always-on supervision in battery-powered applications without compromising runtime |
Applications
| Telecom Power Sequencing | Industrial PLC Controller Reset |
|---|---|
|
Use Scenario: Sequencing multiple DC/DC rails (+3.3V, +1.8V, +1.2V) in 5G baseband units with strict ramp-up order and fault isolation. IC Role / Device Role / Timing Role: Single-supply supervisor monitoring primary +3.3V rail; triggers system-wide reset if rail collapses before FPGA configuration completes. Use Value: Prevents partial initialization and latch-up by holding reset until VCC1 stabilizes above +3.075V for ≥210ms (D3 timeout), ensuring reliable boot. |
Use Scenario: Ensuring deterministic restart after EMI-induced MCU lockup in factory-floor programmable logic controllers. IC Role / Device Role / Timing Role: Watchdog supervisor asserting WDO on missing WDI edges, then forcing RST via MR-WDO tie-off to initiate hard reset. Use Value: Dual-mode watchdog (35s boot window + 1.12s runtime check) avoids false trips during complex ladder logic startup while catching infinite loops. |
| Portable Medical Monitor | Automotive Body Control Module |
|
Use Scenario: Maintaining safe shutdown and cold-start behavior in handheld ECG devices powered by Li-ion batteries with variable discharge profiles. IC Role / Device Role / Timing Role: Primary supply monitor for +3.3V system rail derived from buck converter; asserts RST if battery sag drops VCC1 below +3.075V. Use Value: 14µA quiescent current extends battery life; guaranteed operation down to +0.8V ensures reset remains valid even during deep discharge events. |
Use Scenario: Supervising microcontroller supply in under-hood BCMs exposed to wide thermal swings (-40°C to +125°C) and load dump transients. IC Role / Device Role / Timing Role: High-temp-rated supervisor providing reset hold time and watchdog coverage for CAN-enabled MCU during engine cranking. Use Value: Full -40°C to +125°C qualification and transient immunity (<10µs rejection at 75mV overdrive) prevent nuisance resets during harsh automotive transients. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6730AUTSD3+T | Open-drain RST output, same VCC1 threshold (+3.075V) and D3 timeout - requires external pullup resistor | Suitable where µP reset pin is open-drain compatible or level-shifting is needed | Select when interfacing with legacy µPs requiring open-drain reset signaling or when board layout already includes pullup |
| TPS3808G33DBVR | Single-supply supervisor with +3.3V fixed threshold, 200ms timeout, and open-drain RST - no manual reset or watchdog output | Lacks MR and WDO functionality; intended for simpler reset-only applications | Choose when only basic voltage monitoring is required and watchdog/manual reset are handled elsewhere in system |
Compared with MAX6731AUTSD3+T, MAX6730AUTSD3+T offers identical supervision accuracy and timing but demands an external pullup, increasing component count; TPS3808G33DBVR reduces feature set to reset-only operation, trading watchdog reliability for lower cost and smaller footprint in non-critical systems.
Availability
MAX6731AUTSD3+T is available at Aetrix Electronics and suitable for telecom power sequencing, industrial PLC controller reset, and portable medical monitor applications requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6731AUTSD3+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 communications applications.
The MAX6730A–MAX6735A family delivers multivoltage supervision with integrated watchdog and manual reset for high-reliability embedded systems where deterministic reset behavior and fault resilience are mandatory.
FAQ
What is the exact VCC1 reset threshold voltage for MAX6731AUTSD3+T?
The MAX6731AUTSD3+T has a nominal VCC1 reset threshold of +3.075V, with tolerance of ±1.5% over the full -40°C to +125°C operating range. This value is factory-set and corresponds to the 'T' suffix in the part number's threshold code (e.g., 'UT' + 'T' = +3.075V). The actual threshold falls between +3.000V and +3.150V per datasheet Electrical Characteristics table.
Does MAX6731AUTSD3+T support manual reset functionality?
Yes, MAX6731AUTSD3+T includes an active-low manual reset input (MR) on Pin 4. Driving MR low forces RST assertion regardless of VCC1 status, and RST remains asserted for the full D3 timeout period (140ms–280ms) after MR returns high. An internal 50kΩ pullup resistor allows MR to be left unconnected if unused.
What watchdog timeout periods does MAX6731AUTSD3+T provide?
MAX6731AUTSD3+T implements a dual-mode watchdog: a minimum 35s startup delay after any reset event (power-up, brownout, or MR assertion), followed by a minimum 1.12s normal-mode timeout. The watchdog clears on any WDI edge and asserts WDO low if no transition occurs within the active timeout window.
Is MAX6731AUTSD3+T compatible with bidirectional µP reset pins?
Yes, MAX6731AUTSD3+T's push-pull RST output can interface with bidirectional µP reset pins when a 10kΩ series resistor is placed between RST and the µP pin. This prevents logic contention during bidirectional operation, as specified in Maxim's Application Information section and Figure 5 of the datasheet.
What package type and dimensions does MAX6731AUTSD3+T use?
MAX6731AUTSD3+T uses a 6-pin SOT23-6 package (package code U6-1), with body dimensions of 2.9mm × 1.6mm × 1.1mm and gull-wing leads. It is RoHS-compliant and lead-free, indicated by the '+T' suffix in the part number.
MAX6731AUTSD3+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:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 2.925V
- Output:
- Push-Pull, Totem Pole
- 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
MAX6731AUTSD3+T FAQ
1.How can I place an order for MAX6731AUTSD3+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6731AUTSD3+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 MAX6731AUTSD3+T reliable?
The price and inventory of MAX6731AUTSD3+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6731AUTSD3+T is usually 5 days.
3.What payment methods are accepted for MAX6731AUTSD3+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6731AUTSD3+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6731AUTSD3+T?
MAX6731AUTSD3+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6731AUTSD3+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 MAX6731AUTSD3+T?
For technical support, including MAX6731AUTSD3+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6731AUTSD3+T requirements.
6.How does Aetrix verify that MAX6731AUTSD3+T is sourced from the original manufacturer or authorized distributors?
All MAX6731AUTSD3+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 MAX6731AUTSD3+T meets industry standards.
7.What is the process for return or replacement of MAX6731AUTSD3+T?
All MAX6731AUTSD3+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6731AUTSD3+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 MAX6731AUTSD3+T part is unused and in its original packaging.
Return procedure for MAX6731AUTSD3+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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