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Analog Devices Inc./Maxim Integrated MAX6731UTYD3+
- Part No.:
- MAX6731UTYD3+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-6
- Datasheet:
-
MAX6731UTYD3+.pdf
- Description:
- SINGLE-VOLTAGE MICROPROCESSOR SU
- Quantity:
- Payment:
- Shipping:
Inventory:367
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Product details
Overview
MAX6731UTYD3+ 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 +2.188V threshold (Y suffix), provides 140–280ms reset timeout (D3), and operates from +0.8V to +5.5V supply across –40°C to +85°C - used in telecom power sequencing and embedded controller reset management.
For engineers reviewing the MAX6731UTYD3+ datasheet, MAX6731UTYD3+ pinout, MAX6731UTYD3+ application, or MAX6731UTYD3+ equivalent, this page delivers verified electrical parameters, SOT23-6 package mapping, functional pin roles, real-world use cases for multivoltage systems, and two validated alternative parts with documented technical and application differences.
Technical Context
The MAX6731UTYD3+ integrates a dual-mode watchdog timer (35s startup / 1.12s normal) and a precision voltage monitor with ±0.5% hysteresis and 20ppm/°C tempco. Its push-pull RST output drives directly into bidirectional μP reset I/O without contention when used with a 10kΩ series resistor.
It features guaranteed reset assertion down to VCC1 = +0.8V, 14μA typical supply current at +3.6V, and immunity to sub-100ns VCC transients - enabling reliable operation in noisy industrial and battery-powered environments where brownout resilience is critical.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC1 Reset Threshold | +2.188V (Y suffix), ±0.5% hysteresis - ensures stable reset release after power recovery |
| Reset Timeout Period | 140–280ms (D3 option) - meets minimum processor initialization timing for ARM Cortex-M3/M4 boot sequences |
| Watchdog Timeout | 35s min startup / 1.12s min normal mode - accommodates full system boot before enforcing runtime supervision |
| Supply Current | 14μA typ at +3.6V - enables >10-year battery life in always-on monitoring applications |
| Operating Temp Range | –40°C to +85°C - qualified for industrial-grade embedded control and telecom equipment |
| Output Type | Push-pull RST and WDO - eliminates need for external pullup resistors, reduces BOM count |
| MR Input Threshold | 0.3 × VCC1 low / 0.7 × VCC1 high - compatible with TTL and CMOS logic levels |
Pinout & Package
MAX6731UTYD3+ is housed in a 6-pin SOT23-6 package (package code U6+1), measuring 2.9mm × 1.6mm × 1.1mm, with JEDEC-standard footprint and RoHS-compliant lead-free plating.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RST | Active-low push-pull reset output - asserts within 45µs of VCC1 drop below +2.188V; drives μP reset pin directly |
| 2 | GND | Power return reference - must be connected to system ground plane with low-inductance path for noise immunity |
| 3 | WDO | Active-low push-pull watchdog output - signals processor lockup independently of reset; deasserts immediately on valid WDI edge |
| 4 | MR | Active-low manual reset input - internal 50kΩ pullup allows floating if unused; 1µs minimum pulse width supports tactile switch debounce |
| 5 | WDI | Watchdog input - rising/falling edge clears timer; unconnected state maintains watchdog function; 50ns minimum pulse width |
| 6 | VCC1 | Primary supply input - powers device and sets monitored voltage rail; 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 ensuring rapid fault detection in runtime |
| Guaranteed reset validity | Operates down to VCC1 = +0.8V - maintains correct reset state during deep brownout conditions common in battery-backed systems |
| Immunity to VCC transients | Rejects <100ns glitches - eliminates spurious resets caused by switching noise on power rails |
| Low quiescent current | 14μA typical at +3.6V - extends operational lifetime in energy-constrained portable and IoT endpoints |
| Push-pull outputs | RST and WDO drive high/low actively - removes dependency on external pullups, simplifies layout, improves signal integrity |
Applications
| Telecom Power Sequencing | Industrial PLC Controller Reset |
|---|---|
Use Scenario: Sequencing +3.3V and +1.8V rails in base station RF front-end modules with strict power-up order requirements. IC Role / Device Role / Timing Role: Supervises primary VCC1 rail (+3.3V) and triggers synchronized reset to FPGA and ADCs upon undervoltage. Use Value: Prevents configuration corruption during partial power-up by holding reset until both rails stabilize above +2.188V and +1.575V thresholds. |
Use Scenario: Ensuring deterministic restart after EMI-induced processor hang in DIN-rail mounted programmable logic controllers. IC Role / Device Role / Timing Role: Monitors main +5V supply and feeds WDO output to safety relay driver to initiate controlled shutdown. Use Value: Dual watchdog modes allow full firmware load before enabling 1.12s runtime supervision - reducing nuisance trips during cold start. |
| Portable Medical Monitor | Network Switch Management MCU |
Use Scenario: Battery-powered ECG monitor requiring >5-year shelf life and fail-safe reboot on Li-ion voltage sag. IC Role / Device Role / Timing Role: Resets ARM Cortex-M0+ host MCU when battery drops below +2.188V; MR tied to emergency button. Use Value: 14μA supply current and guaranteed operation down to +0.8V enable reliable brownout detection even as battery discharges to 2.0V. |
Use Scenario: Managing reset coordination between management CPU, PHYs, and packet buffer SRAM in 1U enterprise switches. IC Role / Device Role / Timing Role: Provides independent RST and WDO signals to separate subsystems - decoupling CPU reset from PHY reinitialization. Use Value: Push-pull outputs drive multiple loads simultaneously without signal degradation; 140–280ms D3 timeout aligns with PHY lock acquisition time. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6730UTYD3+ | Open-drain RST/WDO outputs; requires external pullup resistors | Suitable where board-level pullups already exist or where wired-OR reset bus is needed | Select MAX6730UTYD3+ only if open-drain compatibility is required; MAX6731UTYD3+ eliminates pullup components and reduces layout complexity |
| TPS3808G18DBVR | Single-supply monitor only; no manual reset input; 200ms fixed timeout; 2.5μA supply current | Limited to basic reset generation without watchdog or MR functionality | Choose TPS3808G18DBVR for ultra-low-power applications where watchdog and manual reset are unnecessary; MAX6731UTYD3+ adds supervision robustness at modest current cost |
Compared with MAX6730UTYD3+, the MAX6731UTYD3+ eliminates external pullups via push-pull outputs and adds MR capability; versus TPS3808G18DBVR, it delivers full watchdog supervision and manual reset - making it optimal for systems requiring comprehensive fault recovery beyond simple power-on reset.
Availability
MAX6731UTYD3+ is available at Aetrix Electronics and suitable for telecom power sequencing, industrial PLC controller reset, and portable medical monitor applications requiring stable component supply, long-lifecycle support, and guaranteed RoHS-compliant sourcing.
Supply support for MAX6731UTYD3+ 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, and computing markets, with emphasis on reliability-critical power management and interface solutions.
The MAX6730–MAX6735 family was engineered specifically for microprocessor-based systems needing multirail voltage monitoring, deterministic reset timing, and independent watchdog supervision - targeting telecom infrastructure, industrial automation, and embedded computing.
FAQ
What is the exact reset threshold voltage for MAX6731UTYD3+?
The MAX6731UTYD3+ has a factory-set VCC1 reset threshold of +2.188V (Y suffix), with ±0.5% hysteresis and 20ppm/°C temperature coefficient. This value is guaranteed over –40°C to +85°C and applies specifically to the YD3 variant - not adjustable or user-configurable. The threshold is referenced internally and does not require external components.
Does MAX6731UTYD3+ support manual reset functionality?
Yes, MAX6731UTYD3+ includes an active-low manual reset input (MR) with internal 50kΩ pullup to VCC1. Driving MR low forces immediate RST assertion for the full D3 timeout period (140–280ms). MR accepts TTL/CMOS logic levels and requires only a 1µs minimum pulse width - enabling direct connection to momentary switches without external debounce circuitry.
What are the watchdog timer timing characteristics of MAX6731UTYD3+?
MAX6731UTYD3+ features a dual-mode watchdog: a 35s minimum startup delay after reset (to allow full system initialization), followed by a 1.12s minimum normal timeout period. The timer clears on any WDI edge (rising or falling); leaving WDI unconnected does not disable the function. WDO is push-pull and asserts low on timeout.
Is MAX6731UTYD3+ compatible with bidirectional microprocessor reset pins?
Yes, MAX6731UTYD3+ can interface with bidirectional μP reset I/O using a 10kΩ series resistor between RST and the processor pin. This prevents logic contention that may occur with push-pull outputs. The resistor ensures safe voltage translation while maintaining fast 45µs RST response time and full noise immunity per datasheet specifications.
What package type and dimensions does MAX6731UTYD3+ use?
MAX6731UTYD3+ uses a RoHS-compliant 6-pin SOT23-6 package (U6+1 outline), measuring 2.9mm × 1.6mm × 1.1mm. It features gull-wing leads, JEDEC-standard land pattern (90-0175), and thermal resistance θJA = 230°C/W. The package is rated for reflow up to +260°C and supports automated pick-and-place assembly.
MAX6731UTYD3+ 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:
- 2.188V
- 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
MAX6731UTYD3+ FAQ
1.How can I place an order for MAX6731UTYD3+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6731UTYD3+ 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 MAX6731UTYD3+ reliable?
The price and inventory of MAX6731UTYD3+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6731UTYD3+ is usually 5 days.
3.What payment methods are accepted for MAX6731UTYD3+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6731UTYD3+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6731UTYD3+?
MAX6731UTYD3+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6731UTYD3+ 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 MAX6731UTYD3+?
For technical support, including MAX6731UTYD3+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6731UTYD3+ requirements.
6.How does Aetrix verify that MAX6731UTYD3+ is sourced from the original manufacturer or authorized distributors?
All MAX6731UTYD3+ 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 MAX6731UTYD3+ meets industry standards.
7.What is the process for return or replacement of MAX6731UTYD3+?
All MAX6731UTYD3+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6731UTYD3+, 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 MAX6731UTYD3+ part is unused and in its original packaging.
Return procedure for MAX6731UTYD3+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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