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Analog Devices Inc./Maxim Integrated MAX6731AUTLD3+
- Part No.:
- MAX6731AUTLD3+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-6
- Datasheet:
-
MAX6731AUTLD3+.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:1,304
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Product details
Overview
MAX6731AUTLD3+ 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 +4.625V primary supply (VCC1) with 140–280ms reset timeout and operates across –40°C to +125°C. Designed for reliable power-on reset and lockup recovery in embedded control systems.
For engineers reviewing the MAX6731AUTLD3+ datasheet, MAX6731AUTLD3+ pinout, MAX6731AUTLD3+ application, or MAX6731AUTLD3+ equivalent, this page delivers verified electrical parameters, thermal performance data, watchdog timing behavior, and real-world integration guidance - all specific to the MAX6731AUTLD3+ variant with LT threshold and D3 timeout.
Technical Context
The MAX6731AUTLD3+ implements a dual-mode watchdog timer: 35s minimum startup delay after reset enables full system initialization, followed by 1.12s minimum normal-mode timeout for rapid fault detection. Its reset circuitry guarantees valid RST assertion down to VCC1 = +0.8V, with 0.5% hysteresis and 20ppm/°C tempco for stable threshold accuracy over temperature.
This variant monitors only VCC1 (no VCC2 or RSTIN inputs), uses a fixed +4.625V reset threshold (LT suffix), and asserts reset for 140–280ms (D3 suffix). The push-pull RST and WDO outputs eliminate external pullups and support direct interfacing with bidirectional µP reset pins when used with a 10kΩ series resistor.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC1 Reset Threshold | +4.625V nominal (LT suffix); ensures reliable reset assertion during +4.63V rail brownout |
| Reset Timeout Period | 140–280ms (D3 suffix); provides sufficient hold time for slow-starting peripherals |
| Watchdog Startup Delay | 35s min after reset; accommodates complex boot sequences before watchdog monitoring begins |
| Normal Watchdog Timeout | 1.12s min; detects software hangs within sub-second response window |
| Supply Current | 14µA typical at +3.6V; enables long battery life in portable equipment |
| Operating Temperature | –40°C to +125°C; qualified for under-hood automotive and industrial control environments |
| Reset Output Type | Active-low push-pull; drives logic directly without external pullup, supports 1.2mA sink at +2.7V |
Pinout & Package
Package: 6-pin SOT23-6 (U6-1), footprint-compatible with industry-standard 2.9mm × 1.6mm outline and 0.95mm height. RoHS-compliant lead-free package marked "+ACJG".
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RST | Active-low push-pull reset output; asserts low on VCC1 drop below +4.625V, MR low, or watchdog timeout |
| 2 | GND | Ground reference for all internal comparators and output drivers |
| 3 | WDO | Active-low push-pull watchdog output; asserts low if WDI lacks edge for ≥1.12s (normal mode) |
| 4 | MR | Active-low manual reset input; internally pulled up to VCC1 (50kΩ); forces reset when driven low |
| 5 | WDI | Watchdog input; edge-sensitive (rising/falling); clears watchdog timer on each valid transition |
| 6 | VCC1 | Primary supply input; powers device and feeds +4.625V reset comparator; valid operation down to +0.8V |
Key Features
| Feature | Design Value |
|---|---|
| Dual-mode watchdog timer | 35s startup delay + 1.12s normal timeout enables both safe boot and fast hang detection |
| Guaranteed reset validity | RST remains functional down to VCC1 = +0.8V - critical for brownout resilience |
| Immunity to short VCC transients | Rejects <100ns glitches at 75mV overdrive; prevents spurious resets in noisy power rails |
| Low quiescent current | 14µA typical at +3.6V - extends battery runtime in always-on monitoring applications |
| Push-pull RST/WDO outputs | Eliminates need for external pullups; simplifies PCB layout and reduces BOM count |
Applications
| Industrial PLC Controller | Automotive Body Control Module |
|---|---|
Use Scenario: Monitors main 5V logic rail in programmable logic controller during cold cranking and load dump events. IC Role / Device Role / Timing Role: Single-supply supervisor providing power-on reset and watchdog-triggered recovery for ARM Cortex-M7 core. Use Value: 140–280ms reset pulse ensures FPGA configuration completes; push-pull RST drives reset tree without pullup resistors. |
Use Scenario: Supervises 5V microcontroller supply in door module exposed to -40°C ambient and 125°C under-hood transients. IC Role / Device Role / Timing Role: Voltage monitor and watchdog enforcer for ASIL-B compliant safety functions. Use Value: –40°C to +125°C rating and 0.5% hysteresis ensure deterministic reset behavior across full automotive temperature range. |
| Network Router Management CPU | Medical Infusion Pump Controller |
Use Scenario: Provides fail-safe reset for management processor handling SNMP and firmware updates over Ethernet. IC Role / Device Role / Timing Role: Supervisor with manual reset (MR) for field service recovery and watchdog for firmware hang detection. Use Value: MR input allows technician-initiated reset via front-panel button; 35s watchdog startup avoids false triggers during multi-stage boot. |
Use Scenario: Ensures deterministic restart of safety-critical pump motor controller after power interruption or software fault. IC Role / Device Role / Timing Role: Primary reset generator and watchdog monitor for IEC 62304 Class C software. Use Value: 1.12s watchdog timeout meets medical device response-time requirements; push-pull outputs reduce failure modes vs. open-drain. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6730AUTLD3+ | Open-drain RST output; same VCC1 threshold (+4.625V) and D3 timeout; requires external pullup | Suitable where reset line fans out to multiple devices sharing one pullup; less suitable for direct µP reset pin drive | Select MAX6730AUTLD3+ only if open-drain interface is required for wired-OR reset bus topology |
| TPS3808G33DBVR | Single 3.3V fixed threshold; 200ms timeout; push-pull RST; no manual reset or watchdog output | Lacks MR and WDO functionality; limited to 3.3V systems without adjustable supervision | Choose TPS3808G33DBVR only for cost-sensitive 3.3V-only applications where watchdog and manual reset are unnecessary |
Compared with MAX6730AUTLD3+, the MAX6731AUTLD3+ eliminates external pullup components and enables direct µP reset pin connection; compared with TPS3808G33DBVR, it adds critical watchdog and manual reset features essential for robust embedded control.
Availability
MAX6731AUTLD3+ is available at Aetrix Electronics and suitable for industrial PLC controllers, automotive body control modules, network router management CPUs, and medical infusion pump controllers requiring stable component supply across extended temperature ranges.
Supply support for MAX6731AUTLD3+ 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 embedded systems, emphasizing watchdog robustness, wide temperature operation, and minimal external component count.
FAQ
What is the exact reset threshold voltage for MAX6731AUTLD3+?
The MAX6731AUTLD3+ has a factory-set VCC1 reset threshold of +4.625V nominal (LT suffix), with guaranteed limits of +4.500V (min) and +4.750V (max) over temperature. This value is laser-trimmed during production and specified with 0.5% hysteresis and 20ppm/°C tempco for stability across –40°C to +125°C operation.
Does MAX6731AUTLD3+ support monitoring of secondary supply voltages like VCC2?
No, the MAX6731AUTLD3+ monitors only VCC1. Per the Selector Guide and Pin Configurations, MAX6731A variants are single-voltage supervisors - they lack VCC2 and RSTIN pins. Only MAX6732A/MAX6733A (dual-voltage) and MAX6734A/MAX6735A (triple-voltage) include secondary monitoring capability.
What is the function of the MR pin on MAX6731AUTLD3+ and how should it be used?
The MR pin on MAX6731AUTLD3+ is an active-low manual reset input with an internal 50kΩ pullup to VCC1. Driving MR low forces immediate RST assertion for the full reset timeout period (140–280ms). It can be connected to a momentary switch to GND for field service reset; no external debounce is needed due to built-in 100ns glitch rejection.
How does the watchdog timer behave during power-up of MAX6731AUTLD3+?
Upon power-up or reset assertion, the MAX6731AUTLD3+ watchdog enters a 35s minimum startup delay (tWD-L) before normal monitoring begins. During this period, WDO remains deasserted regardless of WDI state. After tWD-L expires or after the first valid WDI edge, the watchdog switches to 1.12s minimum timeout (tWD-S) mode for continuous software execution monitoring.
Can MAX6731AUTLD3+ operate reliably at VCC1 = +0.8V?
Yes - the MAX6731AUTLD3+ guarantees valid RST output operation down to VCC1 = +0.8V, as confirmed in Absolute Maximum Ratings and Electrical Characteristics tables. Below +0.8V, reset behavior is not specified. For applications requiring reset assertion down to 0V, a 100kΩ pull-down on RST is recommended (though not needed for push-pull output).
MAX6731AUTLD3+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SOT-23-6
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 4.625V
- 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
MAX6731AUTLD3+ FAQ
1.How can I place an order for MAX6731AUTLD3+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6731AUTLD3+ 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 MAX6731AUTLD3+ reliable?
The price and inventory of MAX6731AUTLD3+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6731AUTLD3+ is usually 5 days.
3.What payment methods are accepted for MAX6731AUTLD3+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6731AUTLD3+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6731AUTLD3+?
MAX6731AUTLD3+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6731AUTLD3+ 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 MAX6731AUTLD3+?
For technical support, including MAX6731AUTLD3+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6731AUTLD3+ requirements.
6.How does Aetrix verify that MAX6731AUTLD3+ is sourced from the original manufacturer or authorized distributors?
All MAX6731AUTLD3+ 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 MAX6731AUTLD3+ meets industry standards.
7.What is the process for return or replacement of MAX6731AUTLD3+?
All MAX6731AUTLD3+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6731AUTLD3+, 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 MAX6731AUTLD3+ part is unused and in its original packaging.
Return procedure for MAX6731AUTLD3+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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