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Analog Devices Inc./Maxim Integrated MAX6730UTLD3+T
- Part No.:
- MAX6730UTLD3+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-6
- Datasheet:
-
MAX6730UTLD3+T.pdf
- Description:
- IC SUPERVISOR MPU W/WD SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:2,480
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Product details
Overview
MAX6730UTLD3+T from Maxim Integrated is a single-voltage microprocessor supervisor IC with active-low open-drain reset output, factory-set 4.625V VCC1 reset threshold, 140–280ms reset timeout period (D3), and independent watchdog timer featuring 35s startup delay and 1.12s normal-mode timeout. It monitors primary supply voltage only and supports manual reset input for system-level initialization in embedded power management.
For engineers reviewing the MAX6730UTLD3+T datasheet, MAX6730UTLD3+T pinout, MAX6730UTLD3+T application, or MAX6730UTLD3+T equivalent, this device delivers deterministic reset assertion under brownout conditions, low 14μA typical supply current at +3.6V, guaranteed reset validity down to VCC1 = +0.8V, and immunity to short VCC transients - critical for reliable boot sequencing in space-constrained industrial and telecom systems.
Technical Context
The MAX6730UTLD3+T implements a dual-threshold comparator architecture for VCC1 monitoring with ±0.5% hysteresis referenced to typical threshold, enabling stable reset deassertion after overvoltage recovery. Its internal 626mV reference drives the reset comparator and watchdog timing circuitry, ensuring monotonic behavior across -40°C to +85°C.
It integrates a two-phase watchdog timer: a 35s (min) initial startup delay allows full system initialization post-power-up, followed by a 1.12s (min) normal timeout period triggered by any WDI edge transition. The manual reset input (MR) features a 50kΩ internal pullup and 1µs minimum pulse width requirement.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC1 Reset Threshold | 4.625V (factory-set LT suffix); ensures reliable reset assertion when primary supply drops below nominal +4.63V rail |
| Reset Timeout Period | 140–280ms (D3 option); guarantees minimum reset pulse width for safe μP initialization and peripheral settling |
| Supply Current | 14μA typical at +3.6V; enables ultra-low-power operation in battery-backed or energy-sensitive applications |
| Operating Temperature | -40°C to +85°C; fully specified for industrial-grade reliability without derating |
| Reset Output Type | Active-low open-drain; requires external pullup but supports bidirectional μP reset pins and voltage-level translation |
| Watchdog Startup Delay | 35s minimum after reset; provides ample time for complex firmware boot before watchdog supervision begins |
| Manual Reset Input | Active-low with 50kΩ internal pullup; simplifies pushbutton interface without external components |
Pinout & Package
SOT23-6 package (6-pin, 1.6mm × 2.9mm footprint), surface-mount, RoHS-compliant lead(Pb)-free construction with +T suffix.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RST | Active-low reset output | Open-drain driver; asserts low on VCC1 undervoltage, MR assertion, or watchdog timeout; requires external pullup |
| GND | Ground reference | Common return path for all internal comparators, timers, and I/O; must be low-impedance |
| WDO | Active-low watchdog output | Open-drain watchdog status signal; asserts low if no WDI edge occurs within timeout window |
| VCC1 | Primary supply input | Powers device and feeds main reset comparator; monitored at 4.625V threshold |
| WDI | Watchdog input | Edge-sensitive input; rising or falling transition resets watchdog timer; unconnected defaults to ground via 100kΩ |
| MR | Manual reset input | Active-low control; forces RST assertion and clears watchdog counter; 50kΩ internal pullup to VCC1 |
Key Features
| Feature | Design Value |
|---|---|
| Factory-set precision reset threshold | 4.625V VCC1 threshold with ±0.5% hysteresis ensures clean, chatter-free reset release during supply recovery |
| Independent watchdog with dual-mode timing | 35s startup delay + 1.12s normal timeout prevents false triggers during boot while enabling rapid fault detection in runtime |
| Guaranteed reset validity down to VCC1 = +0.8V | Ensures functional reset signaling even during deep brownout, supporting fail-safe shutdown sequences |
| Immunity to short VCC transients | Rejects sub-100ns glitches on VCC1, eliminating spurious resets in electrically noisy environments |
| Low quiescent current | 14μA typical supply draw at +3.6V reduces standby power burden in always-on systems |
Applications
| Telecom Power Sequencing | Industrial PLC Controller |
|---|---|
Use Scenario: Monitoring +4.8V primary bias rail in VoIP gateway power supply with strict reset timing requirements. IC Role / Device Role / Timing Role: Single-supply supervisor asserting active-low open-drain RST to ARM Cortex-M7 MCU during brownout. Use Value: 140–280ms D3 timeout aligns precisely with FPGA configuration time and PHY lock-in window, preventing premature release. |
Use Scenario: Ensuring deterministic restart of a DIN-rail mounted controller after AC line dip or ESD event. IC Role / Device Role / Timing Role: Primary VCC monitor interfacing with bidirectional reset I/O of Renesas RX65N MCU via 10kΩ series resistor. Use Value: Immunity to <100ns VCC transients eliminates nuisance resets in high-noise factory floor environments. |
| Network Switch Management CPU | Portable Medical Monitor |
Use Scenario: Supervising +4.63V core supply for Broadcom BCM56xx switch fabric controller in 1U chassis. IC Role / Device Role / Timing Role: Standalone reset generator with manual reset button support and watchdog supervision of firmware health. Use Value: 35s watchdog startup delay accommodates multi-stage boot ROM execution before supervision begins. |
Use Scenario: Battery-powered patient monitor requiring ultra-low standby current and robust brownout protection. IC Role / Device Role / Timing Role: Low-power supervisor monitoring Li-ion charger output rail (+4.625V) with minimal quiescent draw. Use Value: 14μA typical ICC1 extends battery life between charges without compromising reset accuracy or timing margin. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6731UTLD3+T | Push-pull RST output instead of open-drain; same VCC1 threshold and D3 timeout | Eliminates need for external pullup resistor; incompatible with bidirectional μP reset pins without series resistor | Select when driving CMOS inputs directly and board layout prohibits external pullup |
| TPS3808G33DBVR | 3.3V fixed threshold (not adjustable), 200ms timeout, 1.6μA supply current, SOT23-6 | Lacks manual reset and independent watchdog output; optimized for low-power single-rail monitoring only | Select when only basic 3.3V supervision is required and watchdog functionality is handled elsewhere |
Compared with MAX6731UTLD3+T, the MAX6730UTLD3+T offers open-drain flexibility for mixed-voltage interfaces but requires an external pullup; compared with TPS3808G33DBVR, it provides full watchdog supervision and manual reset at higher quiescent current, making it suitable for systems demanding comprehensive fault coverage.
Availability
MAX6730UTLD3+T is available at Aetrix Electronics and suitable for telecom power sequencing, industrial PLC controllers, network switch management CPUs, and portable medical monitors requiring stable component supply, long-lifecycle assurance, and RoHS-compliant packaging.
Supply support for MAX6730UTLD3+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 industrial, automotive, and communications markets, emphasizing high reliability, low power, and small-footprint solutions.
The MAX6730–MAX6735 family targets embedded systems requiring robust power-on reset, brownout detection, and software-fault supervision - specifically engineered for space-constrained, thermally demanding applications where deterministic timing and supply noise immunity are critical.
FAQ
What is the exact reset threshold voltage for MAX6730UTLD3+T?
The MAX6730UTLD3+T has a factory-set VCC1 reset threshold of 4.625V (LT suffix), with guaranteed min/max limits of 4.500V and 4.750V respectively. This threshold applies solely to the primary supply (VCC1) input; the device does not monitor a secondary voltage. The threshold exhibits ±20ppm/°C tempco and 0.5% hysteresis referenced to typical value, ensuring stable operation across -40°C to +85°C.
Does MAX6730UTLD3+T support manual reset functionality?
Yes, MAX6730UTLD3+T includes an active-low manual reset input (MR) with a built-in 50kΩ pullup resistor to VCC1. Driving MR low forces immediate RST assertion and clears the watchdog timer. RST remains asserted for the full D3 timeout period (140–280ms) after MR returns high. The input accepts TTL/CMOS logic levels and requires a minimum pulse width of 1µs.
What is the watchdog timeout behavior of MAX6730UTLD3+T?
MAX6730UTLD3+T features a dual-mode watchdog timer: a 35s (minimum) startup delay after any reset event, followed by a 1.12s (minimum) normal timeout period. The timer resets on any rising or falling edge at WDI. If no edge occurs within the active timeout window, WDO asserts low. Leaving WDI unconnected does not disable the watchdog; it must be tied to GND via ≤100kΩ resistor to prevent false timeouts.
Is MAX6730UTLD3+T compatible with bidirectional microprocessor reset pins?
Yes, MAX6730UTLD3+T's open-drain RST output is inherently compatible with bidirectional μP reset I/O pins. No series resistor is needed for basic interfacing. However, if logic contention is observed (e.g., μP driving reset high while MAX6730UTLD3+T asserts low), a 10kΩ series resistor between RST and the μP pin resolves contention without affecting timing integrity.
What package type and thermal characteristics does MAX6730UTLD3+T use?
MAX6730UTLD3+T uses the SOT23-6 package (1.6mm × 2.9mm), RoHS-compliant lead(Pb)-free construction denoted by the +T suffix. Its junction-to-ambient thermal resistance (θJA) is 230°C/W on a standard four-layer board. Maximum continuous power dissipation at +70°C is 347.8mW, derating 4.3mW/°C above that temperature.
MAX6730UTLD3+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SOT-23-6
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- -
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 4.625V
- Output:
- Open Drain or Open Collector
- Reset:
- Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-6
MAX6730UTLD3+T FAQ
1.How can I place an order for MAX6730UTLD3+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6730UTLD3+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 MAX6730UTLD3+T reliable?
The price and inventory of MAX6730UTLD3+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6730UTLD3+T is usually 5 days.
3.What payment methods are accepted for MAX6730UTLD3+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6730UTLD3+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6730UTLD3+T?
MAX6730UTLD3+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6730UTLD3+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 MAX6730UTLD3+T?
For technical support, including MAX6730UTLD3+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6730UTLD3+T requirements.
6.How does Aetrix verify that MAX6730UTLD3+T is sourced from the original manufacturer or authorized distributors?
All MAX6730UTLD3+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 MAX6730UTLD3+T meets industry standards.
7.What is the process for return or replacement of MAX6730UTLD3+T?
All MAX6730UTLD3+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6730UTLD3+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 MAX6730UTLD3+T part is unused and in its original packaging.
Return procedure for MAX6730UTLD3+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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