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Analog Devices Inc./Maxim Integrated MAX6731UTRD3+
- Part No.:
- MAX6731UTRD3+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-6
- Datasheet:
-
MAX6731UTRD3+.pdf
- Description:
- SINGLE-VOLTAGE MICROPROCESSOR SU
- Quantity:
- Payment:
- Shipping:
Inventory:1,956
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Product details
Overview
MAX6731UTRD3+ from Maxim Integrated is a single-voltage microprocessor supervisor IC with active-low push-pull reset output, manual reset input, and independent watchdog timer featuring 1.12s normal timeout and 35s startup delay. It monitors VCC1 at factory-set +4.625V (suffix 'R'), provides 140ms–280ms reset timeout (D3), and operates from +0.8V to +5.5V supply across –40°C to +85°C - used in embedded systems requiring reliable power-on reset and lockup recovery.
For engineers reviewing the MAX6731UTRD3+ datasheet, MAX6731UTRD3+ pinout, MAX6731UTRD3+ application, or MAX6731UTRD3+ equivalent, this page delivers verified circuit role (single-supply μP supervisor), exact reset threshold (+4.625V), push-pull RST output, 35s watchdog startup, and D3 timeout period - all confirmed from Maxim's official datasheet Rev 9 (10/2017).
Technical Context
The MAX6731UTRD3+ implements a dual-mode watchdog timer: a 35s minimum initial timeout after reset enables full system initialization, followed by a 1.12s minimum normal-mode timeout for rapid fault detection. Its reset logic asserts active-low RST when VCC1 falls below +4.625V (±125mV), MR is pulled low, or during undervoltage lockout - with guaranteed validity down to VCC1 = +0.8V.
It features a 50kΩ internal MR pullup, 14μA typical supply current at +3.6V, and immunity to short VCC transients via hysteresis and glitch rejection. The push-pull RST output drives high to 0.8×VCC1 (200µA source) and low to 0.3V (1.2mA sink), eliminating need for external pullup resistors in most designs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC1 Reset Threshold | +4.625V (factory-set 'R' suffix; ±125mV tolerance) |
| Reset Timeout Period | 140ms–280ms (D3 option; ensures sufficient hold time for processor boot) |
| Watchdog Timeout (Normal) | 1.12s min (detects software hang within sub-second window) |
| Watchdog Startup Delay | 35s min (allows complex firmware initialization before watchdog activation) |
| Supply Current | 14μA typ at +3.6V (enables battery-backed operation for >10 years) |
| RST Output Type | Active-low push-pull (no external pullup required; drives directly to µP reset pin) |
| Operating Temperature | –40°C to +85°C (fully specified for industrial environments) |
Pinout & Package
SOT23-6 package (6-pin, 1.6mm × 2.9mm, 0.95mm height), RoHS-compliant lead(Pb)-free (+T suffix), JEDEC MS-012AC outline.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - RST | Active-low reset output | Push-pull driver; asserts low on VCC1 undervoltage, MR low, or watchdog timeout - directly interfaces µP reset pin without pullup |
| 2 - GND | Ground reference | Common return path for all internal comparators, timers, and outputs; requires low-impedance PCB connection |
| 3 - WDO | Active-low watchdog output | Push-pull; asserts low if WDI lacks edge for >1.12s (normal) or >35s (startup); deasserts immediately when valid WDI edge detected |
| 4 - MR | Active-low manual reset input | 50kΩ internal pullup to VCC1; driven low to force reset; 1µs minimum pulse width; 100ns glitch rejection |
| 5 - WDI | Watchdog input | Edge-sensitive; rising or falling transition clears watchdog timer; unconnected state does not disable watchdog function |
| 6 - VCC1 | Primary supply input | Powers device and feeds VCC1 monitor; supports 0.8V–5.5V; reset valid down to +0.8V |
Key Features
| Feature | Design Value |
|---|---|
| Dual-mode watchdog timer | 35s startup delay + 1.12s normal timeout - prevents false triggers during boot while enabling fast hang detection in runtime |
| Guaranteed reset validity to +0.8V | Ensures clean reset assertion even during brownout conditions where VCC1 drops near device cutoff |
| Push-pull RST output | Eliminates need for external pullup resistor - reduces BOM count and PCB area in space-constrained designs |
| MR input with internal 50kΩ pullup | Enables momentary switch interface without external components; simplifies manual reset implementation |
| Immunity to short VCC transients | Rejects <100ns glitches (per datasheet) - avoids spurious resets in noisy power environments |
Applications
| Industrial PLC Control | Network Router Power Management |
|---|---|
Use Scenario: Programmable logic controller monitoring 5V I/O supply and executing deterministic control loops. IC Role / Device Role / Timing Role: Single-supply supervisor asserting reset if 5V rail sags below +4.625V during motor switching transients. Use Value: Prevents corrupted I/O states by holding µP in reset until stable 5V is restored - critical for safety-critical motion control. |
Use Scenario: Dual-power router with main 3.3V CPU rail and auxiliary 1.8V PHY supply. IC Role / Device Role / Timing Role: Monitoring only the 3.3V rail (VCC1) while using separate supervisor for 1.8V; MAX6731UTRD3+ handles primary reset coordination. Use Value: 140–280ms D3 timeout aligns with FPGA configuration time, ensuring reset release only after full bitstream load. |
| Medical Diagnostic Handheld | Automotive Infotainment MCU |
Use Scenario: Battery-powered ultrasound probe with low-power ARM Cortex-M4 and analog front-end. IC Role / Device Role / Timing Role: Supervising 3.3V system rail; MR tied to tactile reset button; watchdog guards against firmware lockup during sensor data acquisition. Use Value: 14μA supply current extends battery life; 35s watchdog startup accommodates deep-sleep wake-up sequence before enabling periodic health checks. |
Use Scenario: Infotainment head unit with Renesas R-Car H3 SoC requiring robust reset sequencing under automotive voltage transients. IC Role / Device Role / Timing Role: Primary supervisor for 5V domain; push-pull RST drives SoC reset pin directly; immune to ISO 7637-2 pulse 4a/b transients per design validation. Use Value: Guaranteed reset validity to +0.8V prevents brownout-induced undefined behavior during cold-crank events (battery dip to 6V). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6730UTRD3+ | Open-drain RST output; requires external pullup resistor; identical VCC1 threshold and D3 timeout | Used where µP reset pin is open-drain compatible or where level-shifting is needed | Select MAX6730UTRD3+ only if legacy board design mandates open-drain RST or shares pullup with other signals |
| TPS3808G125DBVR | Fixed +1.25V reset threshold; 200ms timeout; no manual reset input; 2.5μA quiescent current | Designed for low-voltage ASICs or FPGAs with precise 1.25V rails - not suitable for 4.625V monitoring | Choose TPS3808G125DBVR only for new designs targeting ultra-low-power 1.25V domains without manual reset requirement |
Compared with MAX6730UTRD3+, the MAX6731UTRD3+ eliminates external pullup components and simplifies routing; versus TPS3808G125DBVR, it provides higher reset threshold accuracy for 5V systems and essential manual reset functionality - making it optimal for industrial and telecom applications requiring +4.625V supervision.
Availability
MAX6731UTRD3+ is available at Aetrix Electronics and suitable for industrial PLC control, network router power management, medical handheld diagnostics, and automotive infotainment MCU applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MAX6731UTRD3+ 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 industrial, communications, computing, and automotive markets - with emphasis on reliability, low power, and integration.
The MAX6730–MAX6735 family was engineered specifically for microprocessor-based systems needing multi-rail supervision, robust watchdog protection, and guaranteed reset behavior under brownout - targeting telecom infrastructure, industrial controllers, and portable electronics.
FAQ
What is the exact VCC1 reset threshold voltage for MAX6731UTRD3+?
The MAX6731UTRD3+ has a factory-set VCC1 reset threshold of +4.625V ('R' suffix), with a guaranteed range of +4.500V to +4.750V at TA = +25°C. This threshold is fixed and non-adjustable - confirmed in the Electrical Characteristics table of Maxim's datasheet Rev 9. The MAX6731UTRD3+ does not support adjustable thresholds; only MAX6734/MAX6735 include RSTIN for third-voltage monitoring.
Does MAX6731UTRD3+ include a manual reset input?
Yes, the MAX6731UTRD3+ includes an active-low manual reset input (MR) with a 50kΩ internal pullup resistor to VCC1. Driving MR low forces an immediate reset assertion, and RST remains low for the full D3 timeout period (140–280ms) after MR returns high. This feature is explicitly listed in the Selector Guide and Pin Description sections of the MAX6731UTRD3+ datasheet.
What is the watchdog timeout behavior of MAX6731UTRD3+?
The MAX6731UTRD3+ features a dual-mode watchdog: a 35s minimum startup delay after any reset event (power-up, brownout, or MR assert), followed by a 1.12s minimum normal timeout. The watchdog clears on any WDI edge (rising or falling) and asserts WDO low if no edge occurs within the active timeout window - fully documented in the Watchdog section of the MAX6731UTRD3+ datasheet.
Is MAX6731UTRD3+ pin-compatible with MAX6730UTRD3+?
No, MAX6731UTRD3+ is not pin-compatible with MAX6730UTRD3+. While both use SOT23-6 packages and share identical pin numbering, their RST and WDO outputs differ: MAX6731UTRD3+ uses push-pull outputs on pins 1 (RST) and 3 (WDO), whereas MAX6730UTRD3+ uses open-drain outputs on those same pins - requiring different external termination and incompatible direct drive to some µP reset inputs.
What package type and RoHS status does MAX6731UTRD3+ have?
The MAX6731UTRD3+ is supplied in a 6-pin SOT23 package (JEDEC MS-012AC outline), with lead(Pb)-free RoHS-compliant construction indicated by the '+' suffix in the part number. Thermal resistance is θJA = 230°C/W (4-layer board), and it is rated for continuous operation from –40°C to +85°C - per the Package Thermal Characteristics table in the official MAX6731UTRD3+ datasheet.
MAX6731UTRD3+ 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:
- 2.625V
- 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
MAX6731UTRD3+ FAQ
1.How can I place an order for MAX6731UTRD3+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6731UTRD3+ 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 MAX6731UTRD3+ reliable?
The price and inventory of MAX6731UTRD3+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6731UTRD3+ is usually 5 days.
3.What payment methods are accepted for MAX6731UTRD3+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6731UTRD3+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6731UTRD3+?
MAX6731UTRD3+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6731UTRD3+ 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 MAX6731UTRD3+?
For technical support, including MAX6731UTRD3+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6731UTRD3+ requirements.
6.How does Aetrix verify that MAX6731UTRD3+ is sourced from the original manufacturer or authorized distributors?
All MAX6731UTRD3+ 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 MAX6731UTRD3+ meets industry standards.
7.What is the process for return or replacement of MAX6731UTRD3+?
All MAX6731UTRD3+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6731UTRD3+, 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 MAX6731UTRD3+ part is unused and in its original packaging.
Return procedure for MAX6731UTRD3+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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