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Analog Devices Inc./Maxim Integrated MAX6721UTTGD3+T
- Part No.:
- MAX6721UTTGD3+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-6
- Datasheet:
-
MAX6721UTTGD3+T.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:4,102
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Product details
Overview
MAX6721UTTGD3+T from Maxim Integrated is a dual-voltage microprocessor supervisory circuit in SOT23-6 package, monitoring VCC1 (4.625V threshold) and VCC2 (3.075V threshold) with 210ms reset timeout, watchdog timer (35s startup / 1.12s normal), and open-drain active-low RST output. It ensures reliable system reset during power-up, brownout, or software fault in battery-powered and telecom equipment.
For engineers reviewing the MAX6721UTTGD3+T datasheet, MAX6721UTTGD3+T pinout, MAX6721UTTGD3+T application, or MAX6721UTTGD3+T equivalent, key selection criteria include dual-supply monitoring range (1.8–5.0V / 0.9–3.3V), guaranteed reset validity down to VCC = 0.8V, low 14µA supply current, and integrated watchdog with long-startup/short-normal timeout modes.
Technical Context
The MAX6721UTTGD3+T implements independent voltage comparators for VCC1 and VCC2 with factory-trimmed thresholds (4.625V ±125mV and 3.075V ±75mV), hysteresis of 0.5%, and temperature coefficient of 20ppm/°C. Reset assertion occurs on any supply drop below threshold, manual reset (MR) activation, or watchdog timeout.
Its dual-mode watchdog uses a 35s minimum initial timeout after reset events (power-up, MR, or WDI timeout) and transitions to 1.12s minimum normal timeout after first valid WDI edge. The open-drain RST output requires external pullup and remains asserted for ≥210ms after all monitored conditions recover.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC1 Threshold | 4.625V (±125mV); monitors primary supply like 5V or 4.8V rails in telecom systems |
| VCC2 Threshold | 3.075V (±75mV); tracks secondary supplies such as 3.3V I/O or 3.0V core rails |
| Reset Timeout | 210ms (min); ensures µP completes boot sequence before releasing reset |
| Watchdog Timeout | 35s (min startup), 1.12s (min normal); accommodates long initialization then tight fault detection |
| Supply Current | 14µA (typ at 3.6V); enables multi-year operation in coin-cell–powered devices |
| Operating Temp | -40°C to +85°C; supports industrial and outdoor embedded deployments |
| Reset Valid Down To | VCC1 or VCC2 ≥ 0.8V; guarantees correct logic state during deep brownout |
Pinout & Package
SOT23-6 package: 2.9mm × 1.6mm × 1.1mm body, gull-wing leads, RoHS-compliant lead-free (+T) finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RST | Active-low open-drain reset output; requires external pullup; asserts when VCC1/VCC2 drop, MR pulls low, or WDI times out |
| 2 | GND | Ground reference for all internal comparators, watchdog, and output drivers |
| 3 | MR | Active-low manual reset input; internal 50kΩ pullup to VCC1; 1µs minimum pulse width |
| 4 | VCC2 | Secondary supply input (0.9–3.3V range); powers internal circuitry when > VCC1 and sets VCC2 threshold reference |
| 5 | WDI | Watchdog input; rising/falling edge clears timer; long (35s) startup mode followed by short (1.12s) normal mode |
| 6 | VCC1 | Primary supply input (1.8–5.0V range); powers device when > VCC2 and sets VCC1 threshold reference |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent voltage monitoring | Simultaneous tracking of VCC1 (4.625V) and VCC2 (3.075V) with separate comparators and hysteresis |
| Guaranteed reset validity at low VCC | Outputs remain functional and correctly asserted even when VCC1 or VCC2 drops to 0.8V |
| Two-phase watchdog timer | 35s startup window allows full system boot; 1.12s runtime window detects stalled firmware execution |
| Immunity to short VCC transients | No false reset for negative-going glitches ≤20µs (at 100mV overdrive), reducing spurious reboots |
| Low quiescent current | 14µA typical supply draw extends battery life in portable and remote sensor nodes |
Applications
| Telecom Power Sequencing | Industrial PLC Controller |
|---|---|
Use Scenario: Monitoring dual-rail DC/DC outputs (5V and 3.3V) in base station power modules during cold start and line sag. IC Role / Device Role / Timing Role: Dual-supply supervisor asserting reset until both rails stabilize above 4.625V and 3.075V for ≥210ms. Use Value: Prevents FPGA configuration corruption and DSP lockup during partial rail failure. | Use Scenario: Ensuring deterministic boot of ARM-based controller in programmable logic controller under fluctuating 24VDC field supply. IC Role / Device Role / Timing Role: Supervising 5V system rail and 3.3V I/O rail while feeding watchdog input from UART TX line. Use Value: Guarantees safe restart after brownout and detects firmware hangs via WDI activity monitoring. |
| Portable Medical Monitor | Set-Top Box Power Management |
Use Scenario: Managing power-on sequencing and runtime supervision in handheld ECG device powered by single Li-ion cell (3.0–4.2V). IC Role / Device Role / Timing Role: Using VCC1 as main rail monitor and VCC2 as regulated 3.3V analog subsystem supply; MR tied to front-panel reset button. Use Value: Enables 14µA sleep current and prevents data loss during battery voltage dip below 3.3V. | Use Scenario: Coordinating power-up of SoC, DDR memory, and HDMI PHY in consumer STB with multiple LDO outputs. IC Role / Device Role / Timing Role: Dual-supply reset generator with 210ms timeout ensuring synchronous release across voltage domains. Use Value: Eliminates race conditions between processor and peripherals during cold boot. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-voltage supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6722UTTGD3+T | Push-pull RST output instead of open-drain; same thresholds, timeout, and watchdog features | Eliminates need for external pullup resistor; better suited for direct drive of µP reset pins requiring active-high enable | Select MAX6722UTTGD3+T when interfacing with processors lacking internal pullup or requiring stronger drive capability |
| TPS3808G33DBVR | Single-supply monitor (3.3V only); no watchdog or MR input; 200ms timeout; SOT23-6 package | Lacks dual-rail monitoring, manual reset, and watchdog-suitable only for simple 3.3V-only systems | Choose TPS3808G33DBVR only if application requires basic 3.3V supervision without redundancy or fault detection features |
Compared with MAX6721UTTGD3+T, MAX6722UTTGD3+T offers push-pull drive for simplified layout but loses open-drain flexibility; TPS3808G33DBVR reduces cost and complexity but sacrifices dual-supply coverage, watchdog, and manual reset-making it unsuitable for systems requiring robust fault recovery.
Availability
MAX6721UTTGD3+T is available at Aetrix Electronics and suitable for telecom infrastructure, industrial control, and portable medical equipment requiring stable component supply, long-lifecycle support, and guaranteed RoHS-compliant sourcing.
Supply support for MAX6721UTTGD3+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, mixed-signal, and power management ICs for demanding industrial, automotive, and communications applications.
The MAX6715–MAX6729 family delivers ultra-low-voltage, multi-rail supervisory functions targeting space-constrained, battery-sensitive systems where reliability across wide voltage and temperature ranges is critical.
FAQ
What is the exact reset threshold voltage for VCC1 and VCC2 on the MAX6721UTTGD3+T?
The MAX6721UTTGD3+T has factory-trimmed reset thresholds of 4.625V (±125mV) for VCC1 and 3.075V (±75mV) for VCC2, as indicated by the "TG" suffix per Maxim's Reset Voltage Threshold Suffix Guide. These values are guaranteed over -40°C to +85°C and include 0.5% hysteresis referenced to typical threshold.
Does the MAX6721UTTGD3+T include a watchdog timer, and how does it operate?
Yes, the MAX6721UTTGD3+T integrates a dual-mode watchdog timer: a 35s minimum startup timeout after any reset event (power-up, MR, or WDI timeout), followed by a 1.12s minimum normal timeout triggered by the first valid WDI edge. This architecture accommodates lengthy boot sequences while enabling rapid fault detection during runtime.
What package type and pin count does the MAX6721UTTGD3+T use?
The MAX6721UTTGD3+T is housed in a 6-pin SOT23-6 package (2.9mm × 1.6mm × 1.1mm), with lead-free (+T) finish per ordering code. Pinout includes VCC1, VCC2, GND, RST (open-drain), MR, and WDI - no RSTIN or PFI pins, confirming its dual-supply (not triple) configuration.
Can the MAX6721UTTGD3+T monitor a third voltage rail?
No, the MAX6721UTTGD3+T is a dual-voltage supervisor and does not include RSTIN or PFI inputs. Its pinout and Selector Guide confirm it lacks the auxiliary monitoring capability found in MAX6723–MAX6729 variants. For triple-rail supervision, consider MAX6723UTTGD3+T or MAX6728UTTGD3+T.
What is the minimum supply voltage at which the MAX6721UTTGD3+T guarantees correct reset output behavior?
The MAX6721UTTGD3+T guarantees valid reset output logic state as long as either VCC1 or VCC2 remains ≥0.8V. Below this level, reset behavior is not specified. This feature ensures deterministic operation during deep brownout conditions common in battery-backed systems.
MAX6721UTTGD3+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SOT-23-6
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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 ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-6
MAX6721UTTGD3+T FAQ
1.How can I place an order for MAX6721UTTGD3+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6721UTTGD3+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 MAX6721UTTGD3+T reliable?
The price and inventory of MAX6721UTTGD3+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6721UTTGD3+T is usually 5 days.
3.What payment methods are accepted for MAX6721UTTGD3+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6721UTTGD3+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6721UTTGD3+T?
MAX6721UTTGD3+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6721UTTGD3+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 MAX6721UTTGD3+T?
For technical support, including MAX6721UTTGD3+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6721UTTGD3+T requirements.
6.How does Aetrix verify that MAX6721UTTGD3+T is sourced from the original manufacturer or authorized distributors?
All MAX6721UTTGD3+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 MAX6721UTTGD3+T meets industry standards.
7.What is the process for return or replacement of MAX6721UTTGD3+T?
All MAX6721UTTGD3+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6721UTTGD3+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 MAX6721UTTGD3+T part is unused and in its original packaging.
Return procedure for MAX6721UTTGD3+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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