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Analog Devices Inc./Maxim Integrated MAX6731UTZD3+
- Part No.:
- MAX6731UTZD3+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- -
- Datasheet:
-
MAX6731UTZD3+.pdf
- Description:
- SINGLE-VOLTAGE MICROPROCESSOR SU
- Quantity:
- Payment:
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Inventory:1,268
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Product details
Overview
MAX6731UTZD3+ 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 1.68s normal-mode timeout and 54s startup delay. It monitors VCC1 at factory-set +3.075V threshold (TZ suffix), provides 210ms reset timeout (D3), and operates over -40°C to +85°C for embedded power sequencing in portable and industrial systems.
For engineers reviewing the MAX6731UTZD3+ datasheet, MAX6731UTZD3+ pinout, MAX6731UTZD3+ application, or MAX6731UTZD3+ equivalent, this page delivers verified electrical specs, SOT23-6 package layout, real-world use cases in multivoltage systems, and validated alternative parts with documented functional differences.
Technical Context
The MAX6731UTZD3+ integrates a precision voltage monitor for VCC1 (+3.075V threshold), a manual reset input with 50kΩ internal pullup, and a dual-mode watchdog timer-35s minimum startup period followed by 1.12s minimum normal timeout. Its push-pull RST output drives directly into μP reset pins without external pullup.
It uses BiCMOS process technology, guarantees reset validity down to VCC1 = +0.8V, and features immunity to short VCC transients via built-in glitch rejection. Supply current is 14μA typical at +3.6V, enabling battery-operated system monitoring.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC1 Reset Threshold | +3.075V (TZ suffix, falling edge; ±1.5% tolerance over temp) |
| Reset Timeout Period | 210ms (D3 option; ensures reliable processor initialization before release) |
| Watchdog Timeout (Normal) | 1.68s min (prevents lockup during software hangs after boot completion) |
| Watchdog Startup Delay | 54s min (allows full system power-up and firmware initialization) |
| Supply Current | 14μA typ at +3.6V (enables >1-year battery life in low-power monitoring) |
| Operating Temp Range | -40°C to +85°C (fully specified for industrial and telecom environments) |
| RST Output Type | Active-low push-pull (drives μP reset directly; no external pullup required) |
Pinout & Package
SOT23-6 package (6-pin, 1.6mm × 2.9mm footprint), lead(Pb)-free, RoHS compliant, thermal resistance θJA = 230°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - RST | Active-low reset output | Push-pull driver; asserts low on VCC1 undervoltage, MR assertion, or watchdog timeout; valid down to VCC1 = +0.8V |
| 2 - GND | Ground reference | Common return path for all internal comparators and outputs; must be low-impedance |
| 3 - WDO | Active-low watchdog output | Push-pull; asserts low if WDI lacks transition for >1.68s (normal mode) or >54s (startup) |
| 4 - MR | Active-low manual reset input | Internal 50kΩ pullup to VCC1; 1µs minimum pulse width; resets watchdog and RST |
| 5 - WDI | Watchdog input | Edge-sensitive; rising/falling transitions reset watchdog timer; unconnected = no disable |
| 6 - VCC1 | Primary supply input | Powers device and feeds VCC1 monitor; range +0.8V to +5.5V; determines MR/VIL/VIH thresholds |
Key Features
| Feature | Design Value |
|---|---|
| Dual-mode watchdog timer | 54s startup delay + 1.68s normal timeout enables safe boot and rapid hang detection |
| Guaranteed reset validity | RST remains functional down to VCC1 = +0.8V-critical for brownout recovery |
| Immunity to VCC transients | Rejects <100ns glitches; supports noisy power rails without false resets |
| Low quiescent current | 14μA typical at +3.6V-extends battery life in portable equipment |
| Push-pull RST output | Eliminates need for external pullup resistor; simplifies PCB layout and reduces BOM count |
Applications
| Portable/Battery-Operated Equipment | Industrial Equipment |
|---|---|
Use Scenario: Monitoring main supply in handheld medical devices with Li-ion battery and dual-rail PMIC. IC Role / Device Role / Timing Role: Single-supply supervisor ensuring clean reset during battery voltage sag or charger insertion. Use Value: 14μA supply current extends runtime; 210ms reset timeout accommodates slow PMIC ramp-up. |
Use Scenario: Power sequencing and fault detection in programmable logic controllers (PLCs) with isolated I/O modules. IC Role / Device Role / Timing Role: Primary VCC supervisor triggering system-wide reset on 24V rail undervoltage. Use Value: -40°C to +85°C rating ensures reliability in uncontrolled cabinets; push-pull RST drives optocoupler inputs directly. |
| Computers/Servers | Telecom/Networking Equipment |
Use Scenario: Standby power monitoring in server baseboard management controllers (BMC). IC Role / Device Role / Timing Role: Supervising +3.3V standby rail to assert reset if voltage drops below +3.075V. Use Value: TZ threshold matches common 3.3V LDO tolerance; 54s watchdog startup avoids false timeout during BIOS POST. |
Use Scenario: Reset coordination in 5G small cell radios with FPGA, RF transceivers, and analog front-end. IC Role / Device Role / Timing Role: Ensuring deterministic reset timing across multiple voltage domains during cold start. Use Value: Immunity to VCC transients prevents spurious resets during high-current RF burst transmission. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6730UTZD3+ | Open-drain RST output; requires external pullup resistor; identical VCC1 threshold and D3 timeout | Used where reset line must be shared with other open-drain drivers (e.g., I²C-style reset buses) | Select MAX6730UTZD3+ only when bus-wired reset topology is required; otherwise MAX6731UTZD3+ simplifies design |
| TPS3808G33DBVR | Single-supply supervisor with +3.3V fixed threshold; 200ms reset timeout; no manual reset input; 3.5μA supply current | Lacks MR and watchdog; suited for cost-sensitive, minimal-feature applications without software supervision needs | Choose TPS3808G33DBVR only when watchdog and manual reset are unnecessary; MAX6731UTZD3+ adds critical system-level reliability |
Compared with MAX6730UTZD3+, the MAX6731UTZD3+ eliminates external pullup components and enables direct μP reset drive; versus TPS3808G33DBVR, it adds watchdog and MR functionality essential for autonomous recovery in field-deployed systems.
Availability
MAX6731UTZD3+ is available at Aetrix Electronics and suitable for portable/battery-operated equipment, industrial control systems, and telecom infrastructure requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6731UTZD3+ 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 power management, sensing, and interface applications in demanding industrial and communications environments.
The MAX6730–MAX6735 family was engineered specifically for robust microprocessor supervision in multivoltage systems-delivering integrated reset, watchdog, and manual reset in ultra-small SOT23 packages.
FAQ
What is the exact VCC1 reset threshold voltage for MAX6731UTZD3+?
The MAX6731UTZD3+ has a factory-set VCC1 reset threshold of +3.075V (TZ suffix), with ±1.5% tolerance over temperature. This value is guaranteed per Electrical Characteristics table, with hysteresis of 0.5% referenced to typical threshold. The device asserts RST low when VCC1 falls below this level and holds reset for the full 210ms timeout period after recovery.
Does MAX6731UTZD3+ include a manual reset input?
Yes, MAX6731UTZD3+ includes an active-low manual reset input (MR) with internal 50kΩ pullup to VCC1. Driving MR low forces immediate RST assertion and clears the watchdog timer. MR accepts TTL/CMOS logic levels and requires only a 1µs minimum pulse width. Leaving MR unconnected defaults to high via the internal pullup.
What is the watchdog timeout behavior of MAX6731UTZD3+ during power-up?
Upon power-up or reset, MAX6731UTZD3+ enters a 54s minimum watchdog startup period (tWD-L), allowing full system initialization. After this period-or after the first valid WDI edge-the watchdog switches to normal mode with 1.68s minimum timeout (tWD-S). This dual-mode architecture prevents premature timeouts during boot while ensuring rapid response to runtime hangs.
Is MAX6731UTZD3+ compatible with bidirectional μP reset pins?
Yes, but caution is required. Unlike open-drain supervisors, MAX6731UTZD3+'s push-pull RST can cause contention with bidirectional μP reset I/O. To prevent logic conflict, insert a 10kΩ series resistor between RST and the μP's reset pin-this limits current during simultaneous drive and maintains signal integrity without affecting reset timing.
What package type and footprint does MAX6731UTZD3+ use?
MAX6731UTZD3+ uses the SOT23-6 package (outline 21-0058), measuring 1.6mm × 2.9mm with 0.95mm pitch. It is lead(Pb)-free and RoHS compliant (+T suffix), with thermal resistance θJA = 230°C/W. Land pattern 90-0175 is recommended for PCB layout, and the device is compatible with standard reflow profiles up to +260°C.
MAX6731UTZD3+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- *
- Package/Case:
- -
- Packaging:
- Bulk
- Product Status:
- Active
- Programmable:
- -
- Type:
- -
- Number of Voltages Monitored:
- -
- Voltage - Threshold:
- -
- Output:
- -
- Reset:
- -
- Reset Timeout:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
MAX6731UTZD3+ FAQ
1.How can I place an order for MAX6731UTZD3+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6731UTZD3+ 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 MAX6731UTZD3+ reliable?
The price and inventory of MAX6731UTZD3+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6731UTZD3+ is usually 5 days.
3.What payment methods are accepted for MAX6731UTZD3+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6731UTZD3+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6731UTZD3+?
MAX6731UTZD3+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6731UTZD3+ 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 MAX6731UTZD3+?
For technical support, including MAX6731UTZD3+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6731UTZD3+ requirements.
6.How does Aetrix verify that MAX6731UTZD3+ is sourced from the original manufacturer or authorized distributors?
All MAX6731UTZD3+ 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 MAX6731UTZD3+ meets industry standards.
7.What is the process for return or replacement of MAX6731UTZD3+?
All MAX6731UTZD3+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6731UTZD3+, 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 MAX6731UTZD3+ part is unused and in its original packaging.
Return procedure for MAX6731UTZD3+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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