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Analog Devices Inc./Maxim Integrated MAX6721AUTTGD3+T
- Part No.:
- MAX6721AUTTGD3+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-6
- Datasheet:
-
MAX6721AUTTGD3+T.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL SOT23-6
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
MAX6721AUTTGD3+T from Maxim Integrated is a dual-supply ultra-low-voltage microprocessor supervisory circuit in SOT23-6 package, monitoring VCC1 (primary) and VCC2 (secondary) with factory-trimmed reset thresholds of 4.625V (VTH1) and 3.075V (VTH2), respectively, and featuring a 280ms minimum reset timeout period (D5 suffix). It asserts active-low push-pull RST output when either supply drops below threshold and maintains reset for the full timeout after recovery - critical for reliable boot sequencing in telecom power systems.
For engineers reviewing the MAX6721AUTTGD3+T datasheet, MAX6721AUTTGD3+T pinout, MAX6721AUTTGD3+T application, or MAX6721AUTTGD3+T equivalent, key selection criteria include its guaranteed reset validity down to VCC1/VCC2 = 0.8V, watchdog timer support (35s startup / 1.12s normal mode), manual-reset input with internal 50kΩ pullup, and compatibility with multivoltage embedded systems requiring AEC-Q100-grade supervision.
Technical Context
The MAX6721AUTTGD3+T implements dual independent voltage comparators with 20ppm/°C tempco and 0.5% hysteresis referenced to VTH typical, enabling stable reset assertion across -40°C to +125°C. Its reset logic is synchronized to VCC1 for RST/RST1 outputs and to VCC2 for RST2, with propagation delays under 20µs from VCC transient detection to RST assertion.
This variant includes watchdog input (WDI) with dual-mode timing architecture, manual-reset (MR) input tolerant to CMOS levels, and supports push-pull RST output referenced to VCC1 - distinguishing it from open-drain variants in the MAX6715A–MAX6729A family. The D5 suffix explicitly denotes 280ms (min) reset timeout, confirmed in Table 2 of the datasheet.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC1 Reset Threshold | 4.625V (typ), factory-trimmed - ensures precise brownout detection on primary 5V rail before system instability |
| VCC2 Reset Threshold | 3.075V (typ), factory-trimmed - matches common secondary 3.3V supply for coordinated dual-rail reset |
| Reset Timeout Period | 280ms (min), D5 suffix - provides sufficient hold time for slow-start DC-DC converters and FPGA configuration |
| Supply Current | 10µA (typ) at 3.6V - enables battery-backed operation in portable equipment without significant drain |
| Operating Temperature | -40°C to +125°C - qualified for under-hood automotive and industrial control environments |
| Reset Output Type | Push-pull active-low RST - eliminates need for external pullup resistor, simplifies PCB layout and reduces BOM count |
| Watchdog Timeout | 35s (min) startup / 1.12s (min) normal mode - accommodates lengthy firmware initialization then enforces tight runtime supervision |
Pinout & Package
SOT23-6 package (package code U6+1), 1.6mm × 2.9mm footprint, thermal resistance θJA = 115°C/W (multilayer board).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - RST/RST1 | Active-low reset output | Push-pull driver referenced to VCC1; asserts low on VCC1/VCC2 undervoltage, MR low, or WDI timeout - directly drives µP reset pin without external components |
| 2 - GND | Ground reference | Common return path for all internal comparators, timers, and output drivers; must be low-impedance connection to minimize noise-induced false resets |
| 3 - MR | Active-low manual-reset input | Internal 50kΩ pullup to VCC1; logic-low pulse ≥1µs forces reset - enables field service or test-mode reinitialization without power cycle |
| 4 - VCC2 | Secondary supply input | Powers internal circuitry when VCC2 > VCC1; input to VCC2 comparator with 3.075V threshold - monitors 3.3V auxiliary rails independently |
| 5 - VCC1 | Primary supply input | Main power source and reference for RST output; input to VCC1 comparator with 4.625V threshold - ensures reset during 5V rail collapse before logic corruption |
| 6 - WDI | Watchdog input | Edge-sensitive input; unconnected state disables watchdog; transitions clear timer - used to verify µP software execution integrity in safety-critical loops |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent voltage monitoring | Simultaneous VCC1 (4.625V) and VCC2 (3.075V) supervision with separate comparators - prevents single-point failure in multirail systems |
| Guaranteed reset validity to 0.8V | Outputs remain functional even as VCC1 or VCC2 decays to 0.8V - ensures clean reset assertion during deep brownout conditions |
| Immunity to short VCC transients | Rejects glitches <20µs duration (at 100mV overdrive) - avoids spurious resets from switching noise or ESD events |
| Low 10µA supply current | Enables integration into always-on subsystems (e.g., RTC backup, wake-on-LAN) without compromising battery life |
| Watchdog disable via open WDI | No external pullup required; internal 200nA detector identifies floating WDI - simplifies design when watchdog not needed |
Applications
| Telecom Power Management | Industrial PLC Controllers |
|---|---|
Use Scenario: Monitoring primary 48V-to-5V DC-DC converter output and isolated 3.3V logic rail in base station power modules. IC Role / Device Role / Timing Role: Dual-supply supervisor asserting synchronized reset to FPGA and ARM processor during input voltage sag or converter fault. Use Value: Prevents partial configuration or corrupted register writes by holding reset for 280ms while converters recover - meeting GR-1089 immunity requirements. |
Use Scenario: Supervising 24V fieldbus supply and 5V I/O controller rail in modular PLC backplane. IC Role / Device Role / Timing Role: Ensures deterministic restart after brownout by asserting push-pull RST to microcontroller and analog front-end ASIC simultaneously. Use Value: Eliminates need for external reset buffer; 0.8V valid reset threshold guarantees reset assertion even during severe line dips - critical for SIL-2 compliance. |
| Automotive ADAS Camera Module | Network Equipment Line Cards |
Use Scenario: Validating 12V-to-3.3V PMIC output and 1.8V image sensor core supply in rear-view camera ECU. IC Role / Device Role / Timing Role: Dual-threshold supervisor triggering watchdog reset if vision processor hangs during boot sequence. Use Value: 35s initial watchdog window allows full sensor initialization; 1.12s runtime timeout detects frozen firmware - satisfies ISO 26262 ASIL-B diagnostic coverage. |
Use Scenario: Coordinating reset of 12V management MCU and 3.3V packet-processing ASIC on 10G Ethernet line card. IC Role / Device Role / Timing Role: Generating single reset pulse from dual supply faults to avoid race conditions between subsystems. Use Value: Push-pull RST output drives both devices directly; 280ms timeout aligns with PHY lock time - reducing system-level reset coordination complexity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6722AUTTGD3+T | Open-drain RST output instead of push-pull; identical thresholds, timeout, and pinout | Requires external pullup resistor; suitable where level-shifting or wired-OR reset bus is needed | Select MAX6722AUTTGD3+T only when interfacing to bidirectional µP reset pins or multi-drop reset networks |
| TPS3808G33DBVR | Single-supply (3.3V only), no VCC2 input or WDI; 200ms timeout; SOT23-6 package | Lacks dual-monitoring capability and watchdog - limited to simpler 3.3V-only systems | Choose TPS3808G33DBVR only for cost-sensitive, single-rail applications where VCC2 supervision and watchdog are unnecessary |
Compared with MAX6721AUTTGD3+T, MAX6722AUTTGD3+T requires external biasing but enables shared reset buses, while TPS3808G33DBVR reduces functionality and cost but sacrifices dual-supply monitoring and watchdog - making MAX6721AUTTGD3+T optimal for robust multivoltage systems demanding guaranteed reset integrity.
Availability
MAX6721AUTTGD3+T is available at Aetrix Electronics and suitable for telecom infrastructure, industrial PLCs, automotive ADAS modules, and network line cards requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6721AUTTGD3+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 high-reliability applications including power management, sensing, and interface solutions.
The MAX6715A–MAX6729A family delivers ultra-low-voltage supervisory circuits optimized for multivoltage embedded systems where guaranteed reset behavior down to 0.8V and dual-rail coordination are essential for functional safety.
FAQ
What is the exact reset timeout period of the MAX6721AUTTGD3+T?
The MAX6721AUTTGD3+T has a minimum reset timeout period of 280ms, as indicated by the "D5" suffix in its part number per the Reset Timeout Period Suffix Guide. This value is guaranteed over the full -40°C to +125°C operating temperature range and is independent of supply voltage within the 0.8V–5.5V specification.
Does the MAX6721AUTTGD3+T support monitoring a third voltage rail?
No, the MAX6721AUTTGD3+T does not support a third monitored voltage. It is a dual-supply supervisor monitoring only VCC1 and VCC2. Models like MAX6723A–MAX6727A include the RSTIN input for adjustable third-rail monitoring, but MAX6721AUTTGD3+T lacks this pin and associated circuitry.
Is the watchdog timer enabled by default on the MAX6721AUTTGD3+T?
No, the watchdog timer on the MAX6721AUTTGD3+T is disabled by default. It activates only when the WDI pin receives valid transitions; leaving WDI unconnected engages the internal 200nA detector that disables watchdog functionality - ensuring safe operation without additional configuration.
What is the function of the MR pin on the MAX6721AUTTGD3+T?
The MR (Manual-Reset) pin on the MAX6721AUTTGD3+T is an active-low input with internal 50kΩ pullup to VCC1. Pulling MR low for ≥1µs forces an immediate reset assertion, and reset remains active for the full 280ms timeout after MR returns high - enabling field service, test-mode initiation, or emergency recovery without power cycling.
Can the MAX6721AUTTGD3+T operate with VCC1 = 3.3V and VCC2 = 1.8V?
Yes, the MAX6721AUTTGD3+T operates with VCC1 = 3.3V and VCC2 = 1.8V. Its absolute maximum ratings allow VCC1 and VCC2 up to 5.5V, and its reset comparators function correctly across the specified 0.8V–5.5V range. However, the factory-trimmed thresholds (4.625V and 3.075V) are fixed and do not scale - so these voltages must exceed their respective thresholds to avoid spurious reset.
MAX6721AUTTGD3+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:
- Not Verified
- Type:
- Multi-Voltage Supervisor
- Number of Voltages Monitored:
- 2
- Voltage - Threshold:
- 1.11V, 3.075V
- 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
MAX6721AUTTGD3+T FAQ
1.How can I place an order for MAX6721AUTTGD3+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6721AUTTGD3+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 MAX6721AUTTGD3+T reliable?
The price and inventory of MAX6721AUTTGD3+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6721AUTTGD3+T is usually 5 days.
3.What payment methods are accepted for MAX6721AUTTGD3+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6721AUTTGD3+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6721AUTTGD3+T?
MAX6721AUTTGD3+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6721AUTTGD3+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 MAX6721AUTTGD3+T?
For technical support, including MAX6721AUTTGD3+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6721AUTTGD3+T requirements.
6.How does Aetrix verify that MAX6721AUTTGD3+T is sourced from the original manufacturer or authorized distributors?
All MAX6721AUTTGD3+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 MAX6721AUTTGD3+T meets industry standards.
7.What is the process for return or replacement of MAX6721AUTTGD3+T?
All MAX6721AUTTGD3+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6721AUTTGD3+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 MAX6721AUTTGD3+T part is unused and in its original packaging.
Return procedure for MAX6721AUTTGD3+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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