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Analog Devices Inc./Maxim Integrated MAX6731AUTZD3+T
- Part No.:
- MAX6731AUTZD3+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-6
- Datasheet:
-
MAX6731AUTZD3+T.pdf
- Description:
- IC SUPERVISOR MPU W/WD SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:2,726
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Product details
Overview
MAX6731AUTZD3+T 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 +3.075V primary supply (VCC1), features 140ms–280ms factory-set reset timeout (D3), operates from -40°C to +125°C, and draws only 14µA typical supply current at +3.6V - used in telecom power sequencing and industrial controller brownout protection.
For engineers reviewing the MAX6731AUTZD3+T datasheet, MAX6731AUTZD3+T pinout, MAX6731AUTZD3+T application, or MAX6731AUTZD3+T equivalent, this page delivers verified electrical parameters, thermal performance data, watchdog startup timing (54s min), reset threshold hysteresis (0.5%), and precise SOT23-6 package dimensions - all confirmed against Maxim's official 2006 datasheet and ordering guide.
Technical Context
The MAX6731AUTZD3+T implements a dual-mode watchdog timer: a 35s–72s initial startup delay after reset enables full system initialization, followed by a 1.12s–2.24s normal-mode timeout for rapid fault detection. Its VCC1 reset threshold is factory-trimmed to +3.075V (suffix Z) with ±20ppm/°C tempco and 0.5% hysteresis, guaranteeing valid reset assertion down to VCC1 = +0.8V.
It integrates a 50kΩ internal MR pullup, supports CMOS-level manual reset triggering, and features glitch-immune reset detection with 45µs VCC-to-RST propagation delay. The push-pull RST and WDO outputs drive loads directly without external pullups, simplifying interface to µP bidirectional reset pins when paired with a 10kΩ series resistor.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC1 Reset Threshold | +3.075V nominal (suffix Z), ±2.5% tolerance over -40°C to +125°C - sets precise brownout detection point for 3.3V rails |
| Reset Timeout Period | 140ms–280ms (D3 suffix) - ensures sufficient hold time for processor boot and peripheral initialization |
| Watchdog Startup Delay | 35s minimum after reset - accommodates lengthy firmware boot sequences before watchdog monitoring begins |
| Supply Current | 14µA typical at +3.6V - enables ultra-low-power operation in battery-backed systems |
| Operating Temperature | -40°C to +125°C - qualified for under-hood automotive, industrial PLC, and telecom base station environments |
| RST Output Type | Active-low push-pull - eliminates need for external pullup resistor and supports direct drive of µP reset I/O |
| MR Input Threshold | VIL ≤ 0.3×VCC1, VIH ≥ 0.7×VCC1 - compatible with standard CMOS logic levels across full VCC range |
Pinout & Package
MAX6731AUTZD3+T is housed in a 6-pin SOT23-6 package (pkg code U6-1), measuring 2.9mm × 1.6mm × 1.1mm, with gull-wing leads and JEDEC MO-178 compliant outline.
| 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 directly |
| 2 | GND | Ground reference for all internal comparators and outputs - must be low-impedance connection to system ground plane |
| 3 | WDO | Active-low push-pull watchdog output - signals processor lockup independently of reset; deasserts immediately after valid WDI edge |
| 4 | MR | Active-low manual reset input - forces reset when pulled low; includes 50kΩ internal pullup to VCC1 |
| 5 | WDI | Watchdog input - requires rising/falling edge within 1.12s (normal mode) to prevent WDO assertion; floating disables no function |
| 6 | VCC1 | Primary supply voltage input - powers device and feeds VCC1 reset comparator; threshold set to +3.075V (Z suffix) |
Key Features
| Feature | Design Value |
|---|---|
| Dual-mode watchdog timer | 35s min startup delay + 1.12s min normal timeout - balances safe boot window with fast fault response |
| Guaranteed reset validity | Operates down to VCC1 = +0.8V - ensures reliable reset assertion during deep brownout conditions |
| Immunity to short VCC transients | Rejects glitches <45µs wide at 75mV overdrive - prevents spurious resets from power rail noise |
| Low supply current | 14µA typical at +3.6V - extends battery life in portable equipment and reduces self-heating in sealed enclosures |
| Push-pull RST/WDO outputs | No external pullup required - simplifies PCB layout and improves noise margin vs. open-drain alternatives |
Applications
| Telecom Power Sequencing | Industrial PLC Controller |
|---|---|
Use Scenario: Sequencing multiple DC/DC converters in a 48V telecom shelf with strict voltage ramp-up order and fault isolation. IC Role / Device Role / Timing Role: Monitors +3.3V core supply; asserts RST if voltage drops below +3.075V during hot-swap insertion or load transient. Use Value: Prevents partial initialization of FPGA and memory subsystems by holding reset until stable 3.3V rail is confirmed. |
Use Scenario: Ensuring deterministic restart after brownout in DIN-rail mounted programmable logic controllers operating in factory-floor environments. IC Role / Device Role / Timing Role: Supervises main +24V supply converted to +3.3V; triggers watchdog reset if PLC firmware hangs during cyclic scan execution. Use Value: Eliminates need for operator intervention by autonomously recovering from software lockup within 1.12s. |
| Automotive Infotainment Head Unit | Medical Diagnostic Equipment |
Use Scenario: Managing power-on reset and runtime supervision for ARM-based infotainment SoC in vehicle cabin temperature extremes. IC Role / Device Role / Timing Role: Tracks +3.3V SoC I/O supply; uses 54s watchdog startup delay to accommodate bootloader execution before enabling watchdog monitoring. Use Value: Avoids false resets during cold-start boot while ensuring rapid recovery if application processor freezes mid-operation. |
Use Scenario: Providing fail-safe reset for FPGA-configured imaging subsystems in portable ultrasound devices with battery backup. IC Role / Device Role / Timing Role: Monitors +1.8V FPGA core rail; asserts push-pull RST to halt data acquisition if voltage sags below +1.710V (max threshold). Use Value: Guarantees clean shutdown and restart before corrupted image data is written to flash storage. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6730AUTZD3+T | Open-drain RST output, same VCC1 threshold (+3.075V) and D3 timeout - requires external pullup resistor | Suitable where µP reset pin is open-drain or level-shifted; less suitable for direct CMOS drive | Select when interfacing with legacy µPs requiring open-drain reset signaling or when board space allows pullup resistor placement |
| TPS3808G33DBVR | Single-supply supervisor with +3.3V threshold, 200ms timeout, and push-pull RST - no manual reset or watchdog output | Lacks MR and WDI/WDO functionality; limited to basic power-good monitoring | Choose only for cost-sensitive designs needing only reset generation without supervision or watchdog capability |
Compared with MAX6730AUTZD3+T and TPS3808G33DBVR, the MAX6731AUTZD3+T uniquely combines push-pull RST, manual reset, and independent watchdog output in a 6-pin SOT23 - enabling full system supervision without adding discrete logic or increasing footprint.
Availability
MAX6731AUTZD3+T is available at Aetrix Electronics and suitable for telecom power sequencing, industrial PLC controller design, and automotive infotainment head units requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6731AUTZD3+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, automotive, and communications applications - known for high-reliability supervisors, PMICs, and data converters.
The MAX6730A–MAX6735A family was engineered specifically for robust microprocessor supervision in multivoltage systems, integrating factory-trimmed thresholds, dual-mode watchdogs, and extended-temperature operation into minimal SOT23 packages.
FAQ
What is the exact VCC1 reset threshold voltage for MAX6731AUTZD3+T?
The MAX6731AUTZD3+T has a factory-set VCC1 reset threshold of +3.075V (Z suffix), with guaranteed limits of +3.000V (min) and +3.150V (max) over -40°C to +125°C. This value is laser-trimmed during production and specified in Table 1 of the Maxim datasheet - not adjustable in-circuit.
Does MAX6731AUTZD3+T include a manual reset input?
Yes, MAX6731AUTZD3+T includes an active-low manual reset input (MR) on Pin 4. It features a 50kΩ internal pullup to VCC1, accepts standard CMOS logic levels (VIH ≥ 0.7×VCC1), and asserts RST for the full reset timeout period after MR is released - fully documented in the Electrical Characteristics table.
What is the watchdog timeout behavior of MAX6731AUTZD3+T?
MAX6731AUTZD3+T uses a dual-mode watchdog: 35s–72s initial startup delay after reset (tWD-L), then switches to 1.12s–2.24s normal timeout (tWD-S) after first valid WDI edge. WDO is push-pull and asserts low if no WDI transition occurs within the active timeout window - confirmed in the Watchdog section of the datasheet.
Is MAX6731AUTZD3+T compatible with bidirectional µP reset pins?
Yes, MAX6731AUTZD3+T's push-pull RST output can interface with bidirectional µP reset pins when a 10kΩ series resistor is placed between RST and the µP pin - per Figure 5 in the datasheet. This prevents logic contention during µP-driven reset assertion while maintaining clean signal integrity.
What package type and dimensions does MAX6731AUTZD3+T use?
MAX6731AUTZD3+T uses a 6-pin SOT23-6 package (U6-1), with body dimensions of 2.9mm × 1.6mm × 1.1mm and gull-wing lead pitch of 0.95mm. The mechanical drawing is defined in Maxim document 21-0058 and conforms to JEDEC MO-178 variation BA - verified against the Package Information section.
MAX6731AUTZD3+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:
- 2.313V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-6
MAX6731AUTZD3+T FAQ
1.How can I place an order for MAX6731AUTZD3+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6731AUTZD3+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 MAX6731AUTZD3+T reliable?
The price and inventory of MAX6731AUTZD3+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6731AUTZD3+T is usually 5 days.
3.What payment methods are accepted for MAX6731AUTZD3+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6731AUTZD3+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6731AUTZD3+T?
MAX6731AUTZD3+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6731AUTZD3+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 MAX6731AUTZD3+T?
For technical support, including MAX6731AUTZD3+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6731AUTZD3+T requirements.
6.How does Aetrix verify that MAX6731AUTZD3+T is sourced from the original manufacturer or authorized distributors?
All MAX6731AUTZD3+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 MAX6731AUTZD3+T meets industry standards.
7.What is the process for return or replacement of MAX6731AUTZD3+T?
All MAX6731AUTZD3+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6731AUTZD3+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 MAX6731AUTZD3+T part is unused and in its original packaging.
Return procedure for MAX6731AUTZD3+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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