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Analog Devices Inc./Maxim Integrated MAX6731UTTD3-T
- Part No.:
- MAX6731UTTD3-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-6
- Datasheet:
-
MAX6731UTTD3-T.pdf
- Description:
- IC SUPERVISOR MPU
- Quantity:
- Payment:
- Shipping:
Inventory:7,200
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Product details
Overview
MAX6731UTTD3-T from Maxim Integrated is a single-voltage microprocessor supervisory IC with push-pull reset and push-pull watchdog outputs, factory-set VCC1 reset threshold of +3.075V (suffix "T"), and 140ms–280ms reset timeout (suffix "D3"). It monitors primary supply voltage only, features manual reset input, and guarantees valid reset down to VCC1 = +0.8V. Used in embedded systems requiring reliable power-on reset and software lockup detection.
For engineers reviewing the MAX6731UTTD3-T datasheet, MAX6731UTTD3-T pinout, MAX6731UTTD3-T application, or MAX6731UTTD3-T equivalent, this page delivers verified electrical parameters, SOT23-6 package mapping, functional role in multivoltage supervision, and confirmed alternative parts for design flexibility and supply continuity.
Technical Context
The MAX6731UTTD3-T implements dual-mode watchdog timing: 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 internal comparator references a stable 626mV bandgap for VCC1 monitoring, with ±20ppm/°C tempco and 0.5% hysteresis.
Reset assertion occurs when VCC1 falls below +3.075V (±75mV), with 45μs propagation delay from threshold crossing to RST output. The push-pull RST and WDO outputs drive loads directly without external pullups, supporting TTL/CMOS-compatible logic levels and sinking up to 3.2mA at VCC1 = +4.5V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC1 Reset Threshold | +3.075V (nominal), ±75mV tolerance - sets precise brownout detection point for primary supply |
| Reset Timeout Period | 140ms–280ms - ensures sufficient hold time for processor boot sequence before release |
| Watchdog Startup Delay | 35s (min) - allows complex firmware initialization before watchdog enforcement begins |
| Normal Watchdog Timeout | 1.12s (min) - provides fast response to software hangs during runtime |
| Supply Current | 14μA (typ) at +3.6V - enables long battery life in portable equipment |
| RST Output Type | Active-low push-pull - eliminates need for external pullup resistor, simplifies PCB layout |
| WDO Output Type | Active-low push-pull - supports direct connection to processor watchdog input without level-shifting |
Pinout & Package
MAX6731UTTD3-T is housed in a 6-pin SOT23-6 package (U6-1 outline), footprint code 21-0058, with 0.95mm pitch and RoHS-compliant lead-free plating (denoted by "-T" suffix). Thermal resistance θJA = 230°C/W enables operation in compact, thermally constrained spaces.
| 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 pin directly |
| 2 | GND | Ground reference - common return path for all internal comparators and outputs |
| 3 | WDO | Active-low push-pull watchdog output - signals software lockup; can be connected to MR to trigger system reset |
| 4 | MR | Active-low manual reset input - forces reset when pulled low; includes 50kΩ internal pullup to VCC1 |
| 5 | WDI | Watchdog input - requires edge transition every 1.12s (min) in normal mode; unconnected state does not disable watchdog |
| 6 | VCC1 | Primary supply 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 runtime timeout - accommodates both boot complexity and runtime responsiveness |
| Guaranteed reset validity | Operates down to VCC1 = +0.8V - ensures clean reset assertion even during deep brownout conditions |
| Immunity to short VCC transients | Rejects glitches <10μs at 75mV overdrive - prevents spurious resets from power supply noise |
| Low quiescent current | 14μA typical at +3.6V - extends battery life in always-on portable and IoT devices |
| Push-pull RST/WDO outputs | No external pullup required - reduces BOM count and improves signal integrity in high-noise environments |
Applications
| Industrial PLC Controllers | Network Router Power Management |
|---|---|
|
Use Scenario: Monitoring +3.3V main logic supply in programmable logic controllers operating in electrically noisy factory environments. IC Role / Device Role / Timing Role: Single-supply supervisor providing power-on reset, brownout detection, and software watchdog for ARM-based control CPU. Use Value: Push-pull RST ensures robust reset signaling without pullup resistor drift; 140ms–280ms timeout aligns with FPGA configuration time. |
Use Scenario: Ensuring reliable boot and runtime supervision of dual-core MIPS processors in enterprise-grade routers. IC Role / Device Role / Timing Role: Primary voltage supervisor with independent watchdog output tied to processor's WDI pin for lockup recovery. Use Value: 35s initial watchdog delay accommodates multi-stage bootloader execution; 1.12s normal timeout detects stalled packet processing threads. |
| Medical Diagnostic Handhelds | Automotive Infotainment Modules |
|
Use Scenario: Supervising +3.0V core supply in battery-powered ultrasound imaging devices requiring >10-year shelf life. IC Role / Device Role / Timing Role: Low-current (14μA typ) supervisory IC enabling extended standby mode while maintaining reset readiness. Use Value: Guaranteed reset down to +0.8V ensures fail-safe behavior during gradual battery discharge; MR input supports field-service reset via test button. |
Use Scenario: Monitoring +3.3V I/O rail in head-unit modules where EMI immunity and thermal stability are critical. IC Role / Device Role / Timing Role: Single-voltage supervisor with 20ppm/°C tempco and 0.5% hysteresis for consistent threshold accuracy across -40°C to +85°C. Use Value: Immunity to sub-10μs VCC transients prevents false resets from alternator ripple; push-pull outputs reduce susceptibility to ground bounce. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6730UTTD3-T | Open-drain RST and WDO outputs; identical VCC1 threshold (+3.075V) and D3 timeout | Requires external pullup resistors; suitable where isolation or wired-OR reset bus is needed | Select when system architecture mandates open-drain reset signaling or shared reset bus topology |
| TPS3808G30DBVR | Single-supply supervisor with +3.0V threshold, 200ms timeout, and open-drain RST; no integrated watchdog output | Lacks independent watchdog output - requires separate watchdog IC or processor-integrated WDT | Choose when watchdog functionality is handled elsewhere and cost-sensitive designs prioritize TI's broad distribution |
Compared with MAX6731UTTD3-T, MAX6730UTTD3-T offers identical supervision but requires external pullups due to open-drain outputs, while TPS3808G30DBVR provides comparable reset timing but omits the dedicated watchdog output-making MAX6731UTTD3-T optimal for self-contained, low-component-count supervision with lockup protection.
Availability
MAX6731UTTD3-T is available at Aetrix Electronics and suitable for industrial PLC controllers, network router power management, medical diagnostic handhelds, and automotive infotainment modules requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6731UTTD3-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, communications, and computing applications.
The MAX6730–MAX6735 family delivers single-/dual-/triple-voltage supervision with integrated watchdog timers, targeting reliability-critical embedded systems where power integrity and software fault recovery must coexist in minimal footprint.
FAQ
What is the exact VCC1 reset threshold voltage for MAX6731UTTD3-T?
The MAX6731UTTD3-T has a factory-set VCC1 reset threshold of +3.075V nominal, with a guaranteed range of +3.000V to +3.150V across -40°C to +85°C. This value is defined by the "T" suffix in the part number per Table 1 of the datasheet and applies specifically to the MAX6731UTTD3-T variant.
Does MAX6731UTTD3-T include a manual reset input?
Yes, MAX6731UTTD3-T includes an active-low manual reset input (MR) on Pin 4. It features a 50kΩ internal pullup to VCC1, accepts TTL/CMOS logic levels, and asserts reset for the full timeout period after release. MR is fully supported per the device selector guide and pin description table.
What is the watchdog timeout behavior of MAX6731UTTD3-T during power-up?
Upon power-up or reset, MAX6731UTTD3-T enters a 35s minimum initial watchdog mode before transitioning to the 1.12s minimum normal timeout. This dual-mode architecture ensures safe boot completion before watchdog enforcement begins - a confirmed feature documented in the Electrical Characteristics and Detailed Description sections.
Is MAX6731UTTD3-T compatible with bidirectional µP reset pins?
MAX6731UTTD3-T uses a push-pull RST output, which may cause contention with bidirectional µP reset I/O. To prevent this, a 10kΩ series resistor between RST and the µP reset pin is recommended - a solution explicitly described in Figure 5 and Applications Information section of the datasheet.
What package type and footprint does MAX6731UTTD3-T use?
MAX6731UTTD3-T is packaged in a 6-pin SOT23-6 (U6-1 outline), with land pattern number 90-0175 and thermal characteristics θJA = 230°C/W. This package is confirmed in the Ordering Information, Package Information, and Pin Configurations sections of the official datasheet.
MAX6731UTTD3-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:
- 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 ~ 85°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-6
MAX6731UTTD3-T FAQ
1.How can I place an order for MAX6731UTTD3-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6731UTTD3-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 MAX6731UTTD3-T reliable?
The price and inventory of MAX6731UTTD3-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6731UTTD3-T is usually 5 days.
3.What payment methods are accepted for MAX6731UTTD3-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6731UTTD3-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6731UTTD3-T?
MAX6731UTTD3-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6731UTTD3-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 MAX6731UTTD3-T?
For technical support, including MAX6731UTTD3-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6731UTTD3-T requirements.
6.How does Aetrix verify that MAX6731UTTD3-T is sourced from the original manufacturer or authorized distributors?
All MAX6731UTTD3-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 MAX6731UTTD3-T meets industry standards.
7.What is the process for return or replacement of MAX6731UTTD3-T?
All MAX6731UTTD3-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6731UTTD3-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 MAX6731UTTD3-T part is unused and in its original packaging.
Return procedure for MAX6731UTTD3-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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