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Analog Devices Inc./Maxim Integrated MAX6731AUTZD3+
- Part No.:
- MAX6731AUTZD3+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-6
- Datasheet:
-
MAX6731AUTZD3+.pdf
- Description:
- POWER MANAGEMENT CIRCUIT, BICMOS
- Quantity:
- Payment:
- Shipping:
Inventory:2,430
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Product details
Overview
MAX6731AUTZD3+ 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 VCC1 at +3.075V (factory-set), provides 140–280ms reset timeout, 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+ datasheet, MAX6731AUTZD3+ pinout, MAX6731AUTZD3+ application, or MAX6731AUTZD3+ equivalent, this page delivers verified electrical parameters, thermal performance limits, watchdog startup timing (35s min), reset threshold hysteresis (0.5%), and design-meaningful package details for SOT23-6 layout integration.
Technical Context
The MAX6731AUTZD3+ implements dual-mode watchdog logic: a 35s minimum initial timeout after reset enables full system boot, followed by 1.12s minimum normal-mode timeout for rapid fault detection. Its reset comparator guarantees valid operation down to VCC1 = +0.8V and features 20ppm/°C tempco and 0.5% hysteresis referenced to typical threshold.
It uses BiCMOS process (1073 transistors) and integrates a 50kΩ internal MR pullup, glitch rejection (100ns), and immunity to VCC transients ≤10µs at 75mV overdrive. The push-pull RST and WDO outputs drive loads directly without external pullups, supporting CMOS-level interfacing with µP reset I/O pins via optional 10kΩ series resistor.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC1 Reset Threshold | +3.075V (factory-set falling threshold; ensures reliable power-on reset for 3.3V systems) |
| Reset Timeout Period | 140–280ms (D3 suffix; holds reset long enough for FPGA configuration or flash initialization) |
| Watchdog Timeout | 35s min initial / 1.12s min normal (prevents premature lockup detection during boot; enables fast hang detection post-boot) |
| Supply Current | 14µA typical at +3.6V (enables use in battery-backed systems with multi-year shelf life) |
| Operating Temperature | -40°C to +125°C (fully specified for under-hood automotive and industrial control environments) |
| Reset Output Type | Active-low push-pull (drives reset line directly; eliminates need for external pullup resistor) |
| Manual Reset Input | CMOS-compatible with 50kΩ internal pullup (supports momentary switch interface without external components) |
Pinout & Package
Package: 6-pin SOT23-6 (U6-1 code), 2.9mm × 1.6mm footprint, 1.1mm max height, lead-free (RoHS-compliant) variant denoted by '+' suffix.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RST (Pin 1) | Active-low reset output | Push-pull driver asserts low on VCC1 undervoltage, MR assertion, or watchdog timeout; sinks ≥1.2mA at +2.7V |
| GND (Pin 2) | Ground reference | Common return for all internal comparators, watchdog timer, and output drivers; requires low-impedance PCB connection |
| WDO (Pin 3) | Active-low watchdog output | Push-pull output asserts low when WDI stalls >1.12s (normal mode); deasserts immediately upon valid WDI edge |
| MR (Pin 4) | Active-low manual reset input | CMOS-level input with 50kΩ internal pullup to VCC1; 1µs minimum pulse width; rejects <100ns glitches |
| WDI (Pin 5) | Watchdog input | Edge-sensitive input; clears watchdog timer on rising or falling transition; floating state does not disable watchdog |
| VCC1 (Pin 6) | Primary supply input | Powers device and feeds primary reset comparator; valid from +0.8V to +5.5V; supplies internal 626mV reference |
Key Features
| Feature | Design Value |
|---|---|
| Dual-mode watchdog timer | 35s min startup delay + 1.12s min normal timeout enables safe boot and responsive hang detection |
| Guaranteed reset validity | Operates correctly down to VCC1 = +0.8V - supports brownout recovery in deep-sleep modes |
| Immunity to VCC transients | Ignores falling transients ≤10µs at 75mV overdrive - prevents spurious resets in noisy power rails |
| Low quiescent current | 14µA typical at +3.6V - extends battery life in portable equipment and backup circuits |
| Integrated MR pullup | 50kΩ internal resistor allows direct switch-to-ground connection without external components |
Applications
| Telecom Power Sequencing | Industrial PLC Controller |
|---|---|
|
Use Scenario: Sequencing multiple DC/DC rails (+3.3V, +1.8V, +1.2V) in base station RF modules where out-of-spec voltage sequencing causes latch-up. IC Role / Device Role / Timing Role: Monitors primary +3.3V rail (VCC1 = +3.075V threshold) and asserts push-pull RST to hold µP in reset until all rails stabilize. Use Value: Eliminates need for discrete RC reset timers and external voltage detectors; reduces BOM count by 3 components per board. |
Use Scenario: Ensuring deterministic restart after brownout in programmable logic controller CPU modules operating in factory-floor environments with fluctuating 24V DC bus. IC Role / Device Role / Timing Role: Provides 280ms D3 timeout to cover worst-case EEPROM write cycle, while push-pull RST drives µP reset pin directly without pullup. Use Value: Guarantees reset assertion even if VCC1 dips to +0.8V - critical for retaining register state during partial power loss. |
| Medical Diagnostic Imaging | Automotive ADAS Camera Module |
|
Use Scenario: Supervising FPGA configuration voltage in ultrasound beamformer boards where incorrect power-up order corrupts bitstream loading. IC Role / Device Role / Timing Role: Uses MR input to synchronize reset with FPGA DONE signal; watchdog monitors firmware heartbeat via WDI. Use Value: Prevents corrupted FPGA configuration by holding reset until both power rails and configuration are verified. |
Use Scenario: Monitoring +3.3V core supply in surround-view camera ECU exposed to automotive temperature extremes (-40°C to +125°C). IC Role / Device Role / Timing Role: Factory-set +3.075V threshold tracks 3.3V rail tolerance; 140ms minimum timeout covers sensor initialization sequence. Use Value: Fully specified over extended temperature range eliminates derating concerns and qualification testing overhead. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6730AUTZD3+ | Open-drain RST output; same VCC1 threshold (+3.075V), D3 timeout, and watchdog specs | Requires external pullup resistor on RST; suitable for bidirectional µP reset pins without contention risk | Select when interfacing with µPs having bidirectional reset I/O or when open-drain flexibility is needed for wired-OR reset buses |
| TPS3808G33DBVR | Single-supply supervisor with 3.3V threshold, 200ms timeout, but no manual reset input or independent watchdog output | Lacks MR and dedicated WDO pins; relies on WDI-only watchdog with no separate alert output | Choose only if manual reset and isolated watchdog signaling are unnecessary - reduces feature set and design flexibility |
Compared with MAX6730AUTZD3+, the MAX6731AUTZD3+ offers direct-drive reset capability eliminating pullup resistors, while TPS3808G33DBVR sacrifices MR and independent WDO for lower cost and smaller footprint - making MAX6731AUTZD3+ optimal for robust, feature-complete supervision in mission-critical embedded systems.
Availability
MAX6731AUTZD3+ is available at Aetrix Electronics and suitable for telecom power sequencing, industrial PLC controllers, and automotive ADAS camera modules requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6731AUTZD3+ 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.
The MAX6730A–MAX6735A family delivers multivoltage supervision with integrated watchdog and manual reset in ultra-small SOT23 packages - engineered for space-constrained, high-reliability embedded systems needing guaranteed reset behavior across voltage and temperature extremes.
FAQ
What is the exact VCC1 reset threshold voltage for MAX6731AUTZD3+?
The MAX6731AUTZD3+ has a factory-set VCC1 reset threshold of +3.075V (nominal), with guaranteed range +3.000V to +3.150V at TA = -40°C to +125°C. This value corresponds to the 'TZ' suffix in Maxim's Reset Voltage Threshold Suffix Guide and is optimized for reliable reset assertion in standard 3.3V supply rails.
Does MAX6731AUTZD3+ support manual reset functionality?
Yes, MAX6731AUTZD3+ includes an active-low manual reset input (MR) with a built-in 50kΩ pullup resistor to VCC1. Driving MR low forces RST assertion for the full reset timeout period (140–280ms), and it accepts CMOS-level signals or open-drain switches - no external components required for basic pushbutton implementation.
What are the watchdog timeout periods supported by MAX6731AUTZD3+?
MAX6731AUTZD3+ features dual-mode watchdog timing: a minimum 35-second initial timeout after any reset event (power-up, brownout, or MR assertion), followed by a minimum 1.12-second normal-mode timeout once the first valid WDI edge is detected. This architecture accommodates lengthy boot sequences while ensuring rapid response to software hangs.
Is MAX6731AUTZD3+ compatible with bidirectional µP reset pins?
MAX6731AUTZD3+ uses a push-pull RST output, which may cause contention with bidirectional µP reset I/O pins. To prevent logic conflict, connect a 10kΩ series resistor between RST and the µP reset pin - this limits current during contention while preserving reset signal integrity, as confirmed in Maxim's Application Information section.
What package type and dimensions does MAX6731AUTZD3+ use?
MAX6731AUTZD3+ is housed in a lead-free 6-pin SOT23-6 package (U6-1 code), measuring 2.9mm × 1.6mm with 1.1mm maximum height. Its pinout matches JEDEC MO-178 variation BA, and the '+' suffix explicitly denotes RoHS-compliant, matte-tin lead finish per Maxim's ordering conventions.
MAX6731AUTZD3+ 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:
- Monitor
- 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 (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-6
MAX6731AUTZD3+ FAQ
1.How can I place an order for MAX6731AUTZD3+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6731AUTZD3+ 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+ reliable?
The price and inventory of MAX6731AUTZD3+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6731AUTZD3+ is usually 5 days.
3.What payment methods are accepted for MAX6731AUTZD3+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6731AUTZD3+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6731AUTZD3+?
MAX6731AUTZD3+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6731AUTZD3+ 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+?
For technical support, including MAX6731AUTZD3+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6731AUTZD3+ requirements.
6.How does Aetrix verify that MAX6731AUTZD3+ is sourced from the original manufacturer or authorized distributors?
All MAX6731AUTZD3+ 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+ meets industry standards.
7.What is the process for return or replacement of MAX6731AUTZD3+?
All MAX6731AUTZD3+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6731AUTZD3+, 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+ part is unused and in its original packaging.
Return procedure for MAX6731AUTZD3+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX6731AUTZD3+ Tags
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MIC826SYMT-TR
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