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Analog Devices Inc./Maxim Integrated MAX6721AUTWGD3+T
- Part No.:
- MAX6721AUTWGD3+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-6
- Datasheet:
-
MAX6721AUTWGD3+T.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:5,000
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Product details
Overview
MAX6721AUTWGD3+T from Maxim Integrated is a dual-supply ultra-low-voltage microprocessor supervisory circuit in SOT23-6 package, monitoring VCC1 (1.8V–5.0V) and VCC2 (0.9V–3.3V) with factory-trimmed reset thresholds, 140ms minimum reset timeout, watchdog timer (35s startup / 1.12s normal), and push-pull active-low RST output. It ensures reliable system reset in multivoltage embedded systems during brownout or power sequencing events.
For engineers reviewing the MAX6721AUTWGD3+T datasheet, MAX6721AUTWGD3+T pinout, MAX6721AUTWGD3+T application, or MAX6721AUTWGD3+T equivalent, key selection criteria include dual-supply threshold accuracy (±1.5% typical), guaranteed reset validity down to VCC1/VCC2 = 0.8V, low 14µA supply current at 3.6V, watchdog disable capability via floating WDI, and AEC-Q100-compatibility of related variants.
Technical Context
The MAX6721AUTWGD3+T implements independent voltage comparators for VCC1 and VCC2, each with internal hysteresis (0.5% of threshold) and temperature coefficient of 20ppm/°C. Its reset logic asserts RST when either supply falls below its trimmed threshold and holds it active for a fixed 140ms (min) after both supplies recover.
It integrates a dual-mode watchdog timer: a 35s (min) initial startup period enables full system boot before watchdog enforcement begins, followed by a 1.12s (min) normal timeout period requiring periodic WDI transitions. The device uses internal 50kΩ MR pullup and supports push-pull RST referenced to VCC1.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Timeout Period | 140ms (min) - ensures sufficient hold time for processor initialization after power recovery |
| VCC1 Reset Threshold | 2.625V (typ) - factory-trimmed for 2.55V–2.70V range, supporting 2.5V/3.3V system rails |
| VCC2 Reset Threshold | 1.388V (typ) - factory-trimmed for 1.35V–1.425V range, compatible with 1.2V/1.5V core supplies |
| Supply Current | 14µA (typ at 3.6V) - enables long battery life in portable equipment without compromising supervision fidelity |
| Watchdog Timeout | 35s (min startup), 1.12s (min normal) - accommodates complex boot sequences then enforces tight software execution monitoring |
| Operating Temperature | -40°C to +125°C - qualified for automotive under-hood and industrial control environments |
| Reset Output Type | Push-pull active-low RST - eliminates need for external pullup resistor and provides rail-referenced high-level drive |
Pinout & Package
SOT23-6 package (package code U6+1), 1.6mm × 2.9mm footprint, 1.1mm height, thermal resistance θJA = 115°C/W on multilayer board.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - RST | Active-low reset output | Push-pull driver referenced to VCC1; asserts low on VCC1/VCC2 undervoltage, MR low, or watchdog timeout |
| 2 - GND | Ground reference | Common return path for all internal comparators, timers, and output drivers |
| 3 - MR | Manual-reset input | Active-low with internal 50kΩ pullup to VCC1; forces reset for tRP after release |
| 4 - VCC2 | Secondary supply input | Powers internal circuitry when > VCC1; monitored for secondary reset threshold (1.388V typ) |
| 5 - VCC1 | Primary supply input | Main power source and reference for RST output; monitored for primary reset threshold (2.625V typ) |
| 6 - WDI | Watchdog input | Edge-sensitive; floating disables watchdog; transition required every ≤1.12s (min) in normal mode |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent supply monitoring | Simultaneous VCC1 (2.625V typ) and VCC2 (1.388V typ) thresholds eliminate need for two discrete supervisors |
| Guaranteed reset validity down to 0.8V | Ensures correct RST logic state even during deep brownout conditions where VCC1 or VCC2 drops to 0.8V |
| Dual-mode watchdog timer | 35s startup window prevents false timeout during boot; 1.12s runtime enforcement catches hung firmware |
| Immunity to short VCC transients | Withstands <20µs negative glitches up to 100mV overdrive without spurious reset assertion |
| Low 14µA quiescent current | Reduces standby power in always-on systems such as IoT edge nodes and automotive body controllers |
Applications
| Telecom Power Sequencing | Automotive ADAS Camera Module |
|---|---|
|
Use Scenario: Monitoring 12V-to-3.3V/1.2V DC-DC outputs in base station line cards during hot-swap insertion. IC Role / Device Role / Timing Role: Dual-supply supervisor ensuring synchronized reset assertion across FPGA, PHY, and memory interfaces during input voltage ramp-up or sag. Use Value: Prevents metastability and configuration corruption by enforcing 140ms minimum reset hold time while tolerating 0.8V VCC1/VCC2 during transient dips. |
Use Scenario: Validating 5V camera sensor supply and 1.8V image signal processor core rail in rear-view camera ECU. IC Role / Device Role / Timing Role: Fault detector triggering hardware reset if either rail falls below threshold, with watchdog guarding against firmware lockup during image processing. Use Value: Meets ASIL-B functional safety requirements via deterministic reset behavior and -40°C to +125°C operation without derating. |
| Industrial PLC I/O Module | Portable Medical Monitor |
|
Use Scenario: Supervising isolated 24V-to-5V and 3.3V auxiliary rails powering analog front-end and communication ICs in modular I/O chassis. IC Role / Device Role / Timing Role: System integrity guardian asserting RST on undervoltage, manual reset, or watchdog timeout-ensuring clean restart after field-induced power disturbances. Use Value: Push-pull RST eliminates external pullup, reducing BOM count and PCB area in space-constrained DIN-rail modules. |
Use Scenario: Managing battery-backed 3.6V main rail and 1.8V SoC core supply in handheld patient vital sign monitor. IC Role / Device Role / Timing Role: Low-power supervisor enabling >5-year shelf life via 14µA ICC1, with MR support for clinical technician-initiated recalibration reset. Use Value: Guarantees valid reset down to 0.8V, preserving data integrity during final battery discharge phase before shutdown. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-supply supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6722AUTWGD3+T | Identical pinout and electrical specs, but features open-drain RST instead of push-pull | Requires external pullup resistor; suitable where level-shifting or wired-OR reset bus is needed | Select when interfacing to bidirectional µP reset pins or multi-drop reset networks |
| TPS3808G33DBVR | Single-supply (3.3V only), no VCC2 input; 200ms reset timeout; 2.5µA ICC | Lacks dual-rail monitoring; optimized for low-power single-rail systems like wearables | Choose only for cost-sensitive 3.3V-only designs where secondary supply supervision is unnecessary |
Compared with MAX6722AUTWGD3+T and TPS3808G33DBVR, the MAX6721AUTWGD3+T uniquely delivers dual-supply monitoring with push-pull RST in SOT23-6, enabling simpler layout, lower component count, and robust operation across automotive and industrial temperature ranges without external biasing.
Availability
MAX6721AUTWGD3+T is available at Aetrix Electronics and suitable for telecom power sequencing, automotive ADAS modules, industrial PLC I/O, portable medical monitors, and battery-operated edge devices requiring stable component supply across extended temperature and long lifecycle programs.
Supply support for MAX6721AUTWGD3+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.
The MAX6715A–MAX6729A family delivers ultra-low-voltage dual/triple supervisory circuits targeting multirail embedded systems where reliability, small size, and guaranteed operation down to 0.8V are critical design requirements.
FAQ
What is the reset timeout period for MAX6721AUTWGD3+T?
The MAX6721AUTWGD3+T has a fixed minimum reset timeout period of 140ms (D3 suffix). This duration is guaranteed across -40°C to +125°C and ensures the reset signal remains asserted long enough for microprocessors and FPGAs to complete full initialization after power recovery or manual reset. The timeout begins once all monitored supplies exceed their thresholds and ends unconditionally after 140ms.
Does MAX6721AUTWGD3+T support monitoring a third voltage rail?
No, MAX6721AUTWGD3+T is a dual-supply supervisor and does not include the RSTIN input required for adjustable third-rail monitoring. That feature is present only in variants like MAX6723A–MAX6727A. The MAX6721AUTWGD3+T monitors only VCC1 and VCC2, with factory-trimmed thresholds for each-2.625V (typ) for VCC1 and 1.388V (typ) for VCC2.
How is the watchdog timer disabled on MAX6721AUTWGD3+T?
The watchdog timer on MAX6721AUTWGD3+T is disabled by leaving the WDI pin unconnected. An internal 200nA current source detects the floating state and disables watchdog functionality. Do not connect WDI to any node sourcing >50nA, as this may prevent proper disable detection. When disabled, the device operates solely as a dual-supply voltage supervisor with no watchdog-related timing constraints.
What is the operating voltage range for VCC1 and VCC2 on MAX6721AUTWGD3+T?
MAX6721AUTWGD3+T operates with VCC1 from 0.8V to 5.5V and VCC2 from 0.8V to 5.5V. However, its specified monitoring ranges are narrower: VCC1 is monitored from 1.8V to 5.0V, and VCC2 from 0.9V to 3.3V. The wider absolute ratings ensure robustness during power-up/down transients, while the trimmed thresholds apply within those functional monitoring bands.
Is MAX6721AUTWGD3+T AEC-Q100 qualified?
The MAX6721AUTWGD3+T itself is not explicitly listed as AEC-Q100 qualified in the datasheet; however, the closely related MAX6719AUTTWD1/V+T variant is AEC-Q100 Grade 1 qualified (-40°C to +125°C). Both share identical architecture, SOT23-6 packaging, and electrical specifications. For automotive applications requiring formal qualification, designers should verify compliance documentation directly with Analog Devices for the specific MAX6721AUTWGD3+T lot or consider the MAX6719AUTTWD1/V+T as a drop-in alternative.
MAX6721AUTWGD3+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SOT-23-6
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Multi-Voltage Supervisor
- Number of Voltages Monitored:
- 2
- Voltage - Threshold:
- 1.11V, 1.665V
- 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
MAX6721AUTWGD3+T FAQ
1.How can I place an order for MAX6721AUTWGD3+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6721AUTWGD3+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 MAX6721AUTWGD3+T reliable?
The price and inventory of MAX6721AUTWGD3+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6721AUTWGD3+T is usually 5 days.
3.What payment methods are accepted for MAX6721AUTWGD3+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6721AUTWGD3+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6721AUTWGD3+T?
MAX6721AUTWGD3+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6721AUTWGD3+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 MAX6721AUTWGD3+T?
For technical support, including MAX6721AUTWGD3+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6721AUTWGD3+T requirements.
6.How does Aetrix verify that MAX6721AUTWGD3+T is sourced from the original manufacturer or authorized distributors?
All MAX6721AUTWGD3+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 MAX6721AUTWGD3+T meets industry standards.
7.What is the process for return or replacement of MAX6721AUTWGD3+T?
All MAX6721AUTWGD3+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6721AUTWGD3+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 MAX6721AUTWGD3+T part is unused and in its original packaging.
Return procedure for MAX6721AUTWGD3+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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