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Analog Devices Inc./Maxim Integrated MAX6730AUTZD3+
- Part No.:
- MAX6730AUTZD3+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-6
- Datasheet:
-
MAX6730AUTZD3+.pdf
- Description:
- IC SUPERVISOR MPU W/WD SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:1,643
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Product details
Overview
MAX6730AUTZD3+ from Maxim Integrated is a single-voltage microprocessor supervisor IC with active-low open-drain reset output, factory-set +3.075V VCC1 reset threshold, 140–280ms reset timeout, and independent watchdog timer featuring 35s startup delay and 1.12s normal timeout. It monitors primary supply voltage in embedded systems requiring reliable power-on reset and lockup recovery, such as industrial controllers and telecom line cards.
For engineers reviewing the MAX6730AUTZD3+ datasheet, MAX6730AUTZD3+ pinout, MAX6730AUTZD3+ application, or MAX6730AUTZD3+ equivalent, this page delivers verified electrical parameters, SOT23-6 package mapping, functional role in multivoltage supervision, and confirmed alternative parts for design continuity and sourcing flexibility.
Technical Context
The MAX6730AUTZD3+ implements dual-mode watchdog logic: a 35s (min) initial timeout after reset enables full system initialization, followed by a 1.12s (min) normal mode for rapid fault detection. Its reset circuitry guarantees valid RST assertion down to VCC1 = +0.8V and features 20ppm/°C threshold tempco and 0.5% hysteresis for stable brownout detection.
It uses a dedicated comparator for VCC1 monitoring only (no VCC2 or RSTIN inputs), with fixed +3.075V falling-threshold (suffix "TZ"), open-drain RST output requiring external pullup, and manual reset input (MR) with internal 50kΩ pullup - all operating across –40°C to +125°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC1 Reset Threshold | +3.075V (factory-set falling threshold; ensures reset asserts when primary supply drops below nominal 3.3V rail) |
| Reset Timeout Period | 140–280ms (D3 suffix; defines minimum reset pulse width to guarantee µP core initialization completion) |
| Watchdog Timeout (Normal) | 1.12s min (short-period mode for fast software hang detection post-initialization) |
| Watchdog Startup Delay | 35s min (long initial period allows bootloader execution and peripheral configuration before watchdog enforcement) |
| Supply Current | 14µA typ at +3.6V (ultra-low quiescent current enables use in battery-backed or always-on monitoring nodes) |
| Operating Temperature | –40°C to +125°C (fully specified for under-hood automotive, industrial PLC, and telecom equipment environments) |
| RST Output Type | Active-low open-drain (requires external pullup; compatible with bidirectional µP reset pins without contention) |
Pinout & Package
MAX6730AUTZD3+ is housed in a 6-pin SOT23-6 package (package code U6-1), footprint-compatible with industry-standard 0.95mm pitch SOT-23 layouts and suitable for high-density PCB designs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - RST | Active-low reset output | Open-drain output; asserts low during VCC1 undervoltage, MR assertion, or watchdog timeout; requires external pullup resistor |
| 2 - GND | Ground reference | Common return path for all internal comparators, watchdog logic, and I/O; must be low-impedance connection |
| 3 - WDO | Active-low watchdog output | Open-drain watchdog status signal; asserts low if no WDI edge detected within timeout; independent of RST state |
| 4 - MR | Active-low manual reset input | Drives reset on demand; internally pulled up to VCC1 (50kΩ); accepts CMOS logic levels; debouncing not required |
| 5 - WDI | Watchdog input | Edge-sensitive input; rising or falling transition clears watchdog timer; floating input does not disable watchdog function |
| 6 - VCC1 | Primary supply input | Power source and monitored voltage rail; powers internal circuitry and feeds VCC1 reset comparator; range: +0.8V to +5.5V |
Key Features
| Feature | Design Value |
|---|---|
| Dual-mode watchdog timer | 35s startup delay + 1.12s normal timeout enables safe boot sequence and responsive runtime fault detection |
| Guaranteed reset validity | RST remains functional down to VCC1 = +0.8V, ensuring reset integrity during deep brownout conditions |
| Immunity to short VCC transients | Rejects sub-100ns glitches on VCC1 (per Typical Operating Characteristics), preventing spurious resets |
| Low supply current | 14µA typical at +3.6V supports >10-year battery life in always-on supervisory applications |
| Factory-trimmed precision threshold | +3.075V VCC1 reset point with ±1.5% tolerance (±75mV) and 20ppm/°C tempco ensures stable trip point over temperature |
Applications
| Industrial PLC Controller | Telecom Line Card |
|---|---|
Use Scenario: Supervises 3.3V main processor supply and enables watchdog-triggered recovery after firmware crash. IC Role / Device Role / Timing Role: Single-supply voltage monitor and independent watchdog timer with reset coordination. Use Value: Prevents silent system lockup; 35s startup delay accommodates FPGA configuration time before watchdog activation. |
Use Scenario: Monitors primary 3.3V rail in carrier-grade Ethernet switch line card with hot-swap capability. IC Role / Device Role / Timing Role: Power-on reset generator and fail-safe watchdog with glitch-immune VCC sensing. Use Value: 20ppm/°C tempco and –40°C to +125°C operation ensure timing stability in uncontrolled chassis environments. |
| Medical Diagnostic Module | Automotive Body Control Unit |
Use Scenario: Provides certified reset assurance for ARM-based imaging subsystem powered from isolated 3.3V DC/DC converter. IC Role / Device Role / Timing Role: Safety-critical reset supervisor with deterministic timeout and MR override for service mode. Use Value: Open-drain RST output interfaces directly with bidirectional µP reset pin without level-shifting or contention risk. |
Use Scenario: Supervises 3.3V microcontroller supply in under-dash BCM exposed to wide thermal cycling. IC Role / Device Role / Timing Role: High-reliability voltage monitor with extended temperature range and brownout hysteresis. Use Value: Guaranteed reset down to VCC1 = +0.8V prevents undefined µP state during cold-cranking battery sag. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6731AUTZD3+ | Push-pull RST output (vs. open-drain); identical VCC1 threshold (+3.075V), timeout (D3), and watchdog specs | Required where µP reset pin is unidirectional or lacks internal pullup; eliminates need for external RST pullup resistor | Select MAX6731AUTZD3+ when board layout constraints prohibit adding an external pullup or when driving capacitive loads >100pF |
| TPS3808G33DBVR | Single-supply supervisor with +3.3V threshold, 200ms timeout, and push-pull RST; no manual reset or independent WDO | Lacks MR input and separate watchdog output; suited for simpler reset-only use cases without lockup recovery | Choose TPS3808G33DBVR only if watchdog functionality is handled externally and MR is unnecessary |
Compared with MAX6730AUTZD3+, MAX6731AUTZD3+ offers identical supervision accuracy and timing but simplifies BOM by removing the RST pullup resistor, while TPS3808G33DBVR reduces feature count and cost at the expense of system-level fault recovery capability.
Availability
MAX6730AUTZD3+ is available at Aetrix Electronics and suitable for industrial control systems, telecom infrastructure equipment, and automotive body electronics requiring stable component supply, long-term lifecycle support, and guaranteed lead-free compliance.
Supply support for MAX6730AUTZD3+ 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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for demanding industrial, automotive, and communications applications.
The MAX6730A–MAX6735A family was designed specifically for robust, multi-rail microprocessor supervision in harsh environments - delivering precision voltage monitoring, configurable reset timing, and independent watchdog functionality in ultra-small packages.
FAQ
What is the exact VCC1 reset threshold voltage for MAX6730AUTZD3+?
The MAX6730AUTZD3+ has a factory-set VCC1 reset threshold of +3.075V (nominal), with a guaranteed range of +3.000V to +3.150V over –40°C to +125°C. This value corresponds to the "TZ" suffix in the part number and is optimized for monitoring standard 3.3V supply rails with margin against ripple and noise.
Does MAX6730AUTZD3+ support manual reset functionality?
Yes, MAX6730AUTZD3+ includes an active-low manual reset input (MR) with an internal 50kΩ pullup resistor to VCC1. Driving MR low forces an immediate reset assertion, and RST remains low for the full D3 timeout period (140–280ms) after MR is released. No external components are needed for basic MR operation.
What is the watchdog behavior of MAX6730AUTZD3+ during power-up?
Upon power-up or reset assertion, MAX6730AUTZD3+ enters a 35s (minimum) initial watchdog mode before transitioning to the 1.12s (minimum) normal timeout period. This architecture ensures the microprocessor completes bootload, memory initialization, and peripheral setup before watchdog enforcement begins.
Is MAX6730AUTZD3+ compatible with bidirectional µP reset pins?
Yes, MAX6730AUTZD3+ features an open-drain RST output, making it directly compatible with bidirectional reset I/O pins found on many microprocessors. No series resistor is required - unlike push-pull variants - eliminating logic contention risks during reset release or µP-driven reset assertion.
What package type and footprint does MAX6730AUTZD3+ use?
MAX6730AUTZD3+ is supplied in a 6-pin SOT23-6 package (JEDEC MO-178, package code U6-1), with 0.95mm pin pitch and standard SOT-23 land pattern. It is lead-free compliant (RoHS), and the "+" suffix in the part number explicitly denotes lead-free packaging per Maxim's ordering convention.
MAX6730AUTZD3+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SOT-23-6
- Packaging:
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 2.313V
- Output:
- Open Drain or Open Collector
- 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
MAX6730AUTZD3+ FAQ
1.How can I place an order for MAX6730AUTZD3+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6730AUTZD3+ 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 MAX6730AUTZD3+ reliable?
The price and inventory of MAX6730AUTZD3+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6730AUTZD3+ is usually 5 days.
3.What payment methods are accepted for MAX6730AUTZD3+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6730AUTZD3+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6730AUTZD3+?
MAX6730AUTZD3+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6730AUTZD3+ 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 MAX6730AUTZD3+?
For technical support, including MAX6730AUTZD3+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6730AUTZD3+ requirements.
6.How does Aetrix verify that MAX6730AUTZD3+ is sourced from the original manufacturer or authorized distributors?
All MAX6730AUTZD3+ 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 MAX6730AUTZD3+ meets industry standards.
7.What is the process for return or replacement of MAX6730AUTZD3+?
All MAX6730AUTZD3+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6730AUTZD3+, 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 MAX6730AUTZD3+ part is unused and in its original packaging.
Return procedure for MAX6730AUTZD3+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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