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Analog Devices Inc./Maxim Integrated MAX6731AUTTD3+
- Part No.:
- MAX6731AUTTD3+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-6
- Datasheet:
-
MAX6731AUTTD3+.pdf
- Description:
- IC SUPERVISOR MPU W/WD SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:2,362
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Product details
Overview
MAX6731AUTTD3+ 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 140–280ms 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 MAX6731AUTTD3+ datasheet, MAX6731AUTTD3+ pinout, MAX6731AUTTD3+ application, or MAX6731AUTTD3+ equivalent, this page delivers verified circuit role, factory-set voltage thresholds, watchdog timing behavior, SOT23-6 package details, and real-world substitution guidance for industrial and networking equipment design.
Technical Context
The MAX6731AUTTD3+ implements a dual-mode watchdog timer: 35s minimum startup delay after reset assertion enables full system initialization, followed by 1.12s minimum normal-mode timeout for rapid fault detection. Its reset logic guarantees valid RST output down to VCC1 = +0.8V and features immunity to short VCC transients via built-in glitch rejection.
It uses an internal precision reference to generate a fixed +3.075V VCC1 reset threshold (suffix "T"), supports CMOS-level MR input with 50kΩ internal pullup, and asserts RST low on VCC1 undervoltage, MR assertion, or WDI timeout - all with push-pull drive capability eliminating external pullup requirements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC1 Reset Threshold | +3.075V (factory-set falling threshold; ±1.5% tolerance over temperature) |
| Reset Timeout Period | 140–280ms (D3 suffix; ensures sufficient hold time for processor boot completion) |
| Watchdog Startup Delay | 35s min after reset; prevents false timeout during power-up initialization |
| Normal Watchdog Timeout | 1.12s min; enables fast lockup detection during runtime software execution |
| Supply Current | 14µA typ at +3.6V; enables ultra-low-power operation in battery-backed systems |
| Operating Temperature | -40°C to +125°C; qualified for under-hood automotive and industrial control environments |
| RST Output Type | Active-low push-pull; drives directly into µP reset pin without external pullup resistor |
Pinout & Package
MAX6731AUTTD3+ is housed in a 6-pin SOT23-6 package (package code U6-1), measuring 2.9mm × 1.6mm × 1.1mm, with gull-wing leads and lead-free plating (RoHS-compliant).
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RST | Active-low push-pull reset output; asserts when VCC1 drops below +3.075V, MR is pulled low, or watchdog times out |
| 2 | GND | Ground reference for all internal comparators and outputs; must be connected to system ground plane |
| 3 | WDO | Active-low push-pull watchdog output; asserts if no WDI edge occurs within 1.12s (normal mode) or 35s (startup mode) |
| 4 | MR | Active-low manual reset input; internally pulled up to VCC1 (50kΩ); drives RST low when asserted |
| 5 | WDI | Watchdog input; rising or falling edge clears watchdog timer; floating input does not disable watchdog function |
| 6 | VCC1 | Primary supply input; powers device and feeds VCC1 monitor; valid operating range +0.8V to +5.5V |
Key Features
| Feature | Design Value |
|---|---|
| Fixed VCC1 reset threshold | +3.075V (suffix "T") with 20ppm/°C tempco and 0.5% hysteresis - eliminates external resistor divider |
| Push-pull RST and WDO outputs | No external pullup required; compatible with bidirectional µP reset pins when used with 10kΩ series resistor |
| Manual reset with internal pullup | 50kΩ internal MR pullup to VCC1 - simplifies PCB layout and reduces BOM count |
| Glitch-immune reset detection | Rejects VCC transients <100ns at 75mV overdrive - prevents spurious resets in noisy power environments |
| Guaranteed operation down to VCC1 = +0.8V | Ensures clean reset assertion during brownout conditions before system power collapse |
Applications
| Telecom Power Sequencing | Industrial PLC Controller Reset |
|---|---|
|
Use Scenario: Sequencing multiple DC/DC rails (+3.3V, +1.8V, +1.2V) in base station line cards with precise timing and fault isolation. IC Role / Device Role / Timing Role: Single-supply supervisor monitoring primary +3.3V rail; triggers system-wide reset if rail collapses during hot-swap events. Use Value: 140–280ms D3 timeout aligns with FPGA configuration window; push-pull RST ensures immediate, low-impedance reset assertion without pullup dependency. |
Use Scenario: Ensuring deterministic restart of ARM-based PLC controllers after ESD-induced lockup in factory automation cabinets. IC Role / Device Role / Timing Role: Supervisor providing both automatic VCC1 monitoring and operator-initiated MR reset via front-panel button. Use Value: 35s watchdog startup delay accommodates bootloader execution; 1.12s normal timeout catches infinite loops in ladder logic runtime. |
| Networking Equipment Watchdog | Portable Medical Device Power Management |
|
Use Scenario: Preventing silent failure in managed Ethernet switches running Linux-based firmware with complex initialization sequences. IC Role / Device Role / Timing Role: Independent watchdog timer with dedicated WDO output tied to system reset controller; decoupled from reset assertion timing. Use Value: Push-pull WDO drives reset logic directly; eliminates need for level-shifting or pullup networks in multi-rail 12V/5V/3.3V systems. |
Use Scenario: Maintaining safe shutdown and recovery in battery-powered ultrasound handhelds where supply voltage sags during high-current transducer bursts. IC Role / Device Role / Timing Role: Low-quiescent-current supervisor (14µA typ) monitoring main Li-ion-derived +3.3V rail to prevent corrupted memory writes. Use Value: Valid RST output down to VCC1 = +0.8V ensures reset remains asserted through deep brownout - critical for data integrity during power loss. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6730AUTTD3+ | Open-drain RST output; requires external pullup resistor; same VCC1 threshold and D3 timeout | Suitable where µP reset pin is open-drain or level-shifted; adds one passive component | Select when interfacing with legacy processors requiring wired-OR reset buses or I²C-compatible reset signaling |
| TPS3808G33DBVR | Single-supply supervisor with +3.3V threshold, 200ms timeout, and open-drain RST; no manual reset input | Lacks MR pin and independent watchdog output; simpler feature set for basic reset-only use cases | Choose when watchdog functionality is unnecessary and board space is constrained - smaller footprint but reduced system supervision capability |
Compared with MAX6730AUTTD3+, the MAX6731AUTTD3+ eliminates external pullup needs via push-pull RST, while TPS3808G33DBVR trades MR and watchdog features for lower cost and size - making MAX6731AUTTD3+ optimal for robust, self-contained reset+watchdog supervision in mission-critical embedded systems.
Availability
MAX6731AUTTD3+ is available at Aetrix Electronics and suitable for telecom infrastructure, industrial PLCs, and portable medical devices requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6731AUTTD3+ 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 was engineered specifically for high-reliability microprocessor supervision in multivoltage systems - delivering integrated reset, manual reset, and independent watchdog functions in minimal SOT23 footprints.
FAQ
What is the exact VCC1 reset threshold voltage for MAX6731AUTTD3+?
The MAX6731AUTTD3+ has a factory-set VCC1 reset threshold of +3.075V (nominal), with guaranteed limits of +3.000V (min) and +3.150V (max) over -40°C to +125°C. This value corresponds to the "T" suffix in the part number and is implemented using a trimmed internal reference, not external resistors.
Does MAX6731AUTTD3+ include a manual reset input?
Yes, MAX6731AUTTD3+ includes an active-low manual reset input (MR) on Pin 4. It features a 50kΩ internal pullup to VCC1, accepts standard CMOS logic levels, and holds RST asserted for the full 140–280ms reset timeout period after MR is released - enabling front-panel or test-point reset functionality without external components.
What is the watchdog behavior of MAX6731AUTTD3+ during power-up?
Upon power-up or reset assertion, MAX6731AUTTD3+ enters a 35s minimum watchdog startup delay (tWD-L) before entering normal mode. This allows full system initialization - including bootloader execution and peripheral configuration - before the 1.12s minimum normal watchdog timeout (tWD-S) begins monitoring WDI transitions.
Can MAX6731AUTTD3+ operate with VCC1 below 1.0V?
Yes, MAX6731AUTTD3+ guarantees valid reset output down to VCC1 = +0.8V. Below this voltage, internal circuitry may cease operation, but RST remains asserted as long as VCC1 ≥ +0.8V - ensuring reliable brownout detection and preventing premature release of reset during power collapse.
What package type and lead finish does MAX6731AUTTD3+ use?
MAX6731AUTTD3+ is supplied in a 6-pin SOT23-6 package (JEDEC MO-178, package code U6-1), with lead-free (RoHS-compliant) matte tin plating. The "+" suffix in the part number explicitly denotes lead-free packaging, per Maxim's ordering convention.
MAX6731AUTTD3+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SOT-23-6
- Packaging:
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 3.075V
- 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
MAX6731AUTTD3+ FAQ
1.How can I place an order for MAX6731AUTTD3+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6731AUTTD3+ 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 MAX6731AUTTD3+ reliable?
The price and inventory of MAX6731AUTTD3+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6731AUTTD3+ is usually 5 days.
3.What payment methods are accepted for MAX6731AUTTD3+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6731AUTTD3+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6731AUTTD3+?
MAX6731AUTTD3+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6731AUTTD3+ 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 MAX6731AUTTD3+?
For technical support, including MAX6731AUTTD3+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6731AUTTD3+ requirements.
6.How does Aetrix verify that MAX6731AUTTD3+ is sourced from the original manufacturer or authorized distributors?
All MAX6731AUTTD3+ 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 MAX6731AUTTD3+ meets industry standards.
7.What is the process for return or replacement of MAX6731AUTTD3+?
All MAX6731AUTTD3+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6731AUTTD3+, 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 MAX6731AUTTD3+ part is unused and in its original packaging.
Return procedure for MAX6731AUTTD3+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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