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Analog Devices Inc./Maxim Integrated MAX6721UTVDD3
- Part No.:
- MAX6721UTVDD3
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-6
- Datasheet:
-
MAX6721UTVDD3.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:1,801
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Product details
Overview
MAX6721UTVDD3 from Maxim Integrated is a dual-voltage microprocessor supervisory IC in 6-pin SOT23 package, monitoring VCC1 (4.625V threshold) and VCC2 (3.075V threshold) with 210ms reset timeout, watchdog timer (35s startup / 1.12s normal), and push-pull active-low RST output. It ensures reliable system reset during power-up, brownout, or software hang in battery-powered telecom and industrial controllers.
For engineers reviewing the MAX6721UTVDD3 datasheet, MAX6721UTVDD3 pinout, MAX6721UTVDD3 application, or MAX6721UTVDD3 equivalent, key selection criteria include dual-supply threshold accuracy (±1.5% over -40°C to +125°C), guaranteed reset validity down to VCC1/VCC2 = 0.8V, low 14µA supply current at 3.6V, and integrated watchdog disable via floating WDI.
Technical Context
The MAX6721UTVDD3 implements independent voltage comparators for VCC1 and VCC2, each with factory-trimmed thresholds (4.625V and 3.075V respectively) and 0.5% hysteresis. Its dual-mode watchdog uses a 35s minimum startup period after reset, then transitions to 1.12s normal timeout upon first WDI edge detection.
Reset assertion occurs on any monitored supply drop below threshold, MR low pulse, or watchdog timeout; reset remains asserted for 210ms min after all conditions clear. The push-pull RST output is referenced to VCC1 and sinks up to 3.2mA at 4.5V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC1 Threshold | 4.625V (factory-trimmed, ±1.5% over temp - sets primary supply brownout detection point) |
| VCC2 Threshold | 3.075V (factory-trimmed, ±1.5% over temp - enables secondary rail monitoring without external resistors) |
| Reset Timeout | 210ms (min) - ensures µP completes boot sequence before release from reset) |
| Watchdog Timeout | 1.12s (min normal mode) - provides rapid fault detection during runtime after 35s startup window) |
| Supply Current | 14µA (typ at 3.6V) - enables multi-year operation in coin-cell–powered IoT sensors) |
| Operating Temp | -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; drives directly into µP reset pin) |
Pinout & Package
Package: 6-pin SOT23 (2.9mm × 1.6mm × 1.1mm, JEDEC MO-178AA). Pinout validated per Maxim datasheet Rev 3 (19-0536).
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RST | Active-low push-pull reset output referenced to VCC1; asserts when VCC1/VCC2 drop below thresholds or watchdog triggers |
| 2 | GND | System ground reference for all internal comparators and logic |
| 3 | MR | Active-low manual-reset input with 50kΩ internal pullup to VCC1; forces reset when pulled low |
| 4 | VCC2 | Secondary supply input powering VCC2 comparator and enabling dual-rail monitoring |
| 5 | VCC1 | Primary supply input powering device core and VCC1 comparator; determines RST output voltage level |
| 6 | WDI | Watchdog input; floating disables watchdog; rising/falling edges reset 1.12s timeout counter |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent voltage monitors | Factory-trimmed VCC1=4.625V and VCC2=3.075V eliminate calibration effort and reduce BOM count vs discrete solutions |
| Dual-mode watchdog timer | 35s startup delay prevents false timeout during boot; 1.12s runtime timeout detects software hangs within milliseconds |
| Guaranteed reset validity to 0.8V | Ensures clean reset assertion even during deep brownout - critical for flash programming integrity |
| Low 14µA supply current | Enables always-on supervision in energy-constrained applications like portable medical devices and wireless sensors |
| Push-pull RST output | Drives µP reset pin directly without external components - reduces PCB area and improves noise immunity |
Applications
| Industrial PLC Controller | 5G Small Cell Baseband Unit |
|---|---|
Use Scenario: Monitors 5V primary rail (VCC1) and 3.3V FPGA I/O rail (VCC2) in DIN-rail mounted programmable logic controller. IC Role / Device Role / Timing Role: Dual-supply supervisor asserting reset if either rail drops during EMI transients or thermal derating. Use Value: Prevents corrupted ladder logic execution by guaranteeing 210ms reset hold time after rail recovery - meets IEC 61000-4-4 immunity requirements. | Use Scenario: Supervises 4.6V DC-DC output (VCC1) and 3.1V RF front-end bias rail (VCC2) in compact 5G small cell radio unit. IC Role / Device Role / Timing Role: Ensures baseband processor resets cleanly during power cycling and detects silent firmware lockups via watchdog. Use Value: 1.12s watchdog timeout catches stalled DSP threads before packet loss exceeds 3GPP TR 38.901 latency thresholds. |
| Battery-Powered Telematics Gateway | Automotive ADAS Camera Module |
Use Scenario: Monitors 4.6V main system rail (VCC1) and 3.1V CAN transceiver rail (VCC2) in vehicle OBD-II telematics gateway powered by Li-ion battery. IC Role / Device Role / Timing Role: Detects gradual battery discharge below operational thresholds and initiates graceful shutdown via µP interrupt. Use Value: Factory-trimmed 4.625V/3.075V thresholds match automotive supply tolerances - eliminates field calibration labor. | Use Scenario: Supervises 4.6V image sensor analog supply (VCC1) and 3.1V ISP digital core rail (VCC2) in rear-view camera module operating under hood temperature extremes. IC Role / Device Role / Timing Role: Guarantees valid reset signal down to 0.8V during cold-crank events where battery dips to 6V. Use Value: -40°C to +125°C operation and 0.5% hysteresis prevent nuisance resets caused by thermal drift in engine bay mounting. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-voltage supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS3808G33DBVR | Single-supply monitor (3.3V only); no VCC2 input or watchdog; 200ms timeout | Lacks dual-rail capability - requires separate IC for secondary rail monitoring | Select when only primary 3.3V rail supervision is needed and cost is prioritized over feature integration |
| ADM6710LAKSZ-REEL7 | Triple-supply monitor with adjustable RSTIN; 200ms timeout; open-drain RST | Requires external pullup resistor and resistor divider for third rail - increases layout complexity | Select when monitoring three rails is mandatory and push-pull drive is not required |
Compared with TPS3808G33DBVR and ADM6710LAKSZ-REEL7, MAX6721UTVDD3 uniquely integrates dual factory-trimmed thresholds, push-pull RST, and dual-mode watchdog in one 6-pin SOT23 - reducing component count, PCB area, and qualification effort for space-constrained dual-rail systems.
Availability
MAX6721UTVDD3 is available at Aetrix Electronics and suitable for industrial PLC controllers, 5G small cell baseband units, and automotive ADAS camera modules requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6721UTVDD3 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 µP supervision with dual/triple supply monitoring, integrated watchdog, and wide temperature operation - targeting high-reliability embedded systems where power integrity and fault recovery are mission-critical.
FAQ
What is the exact reset threshold voltage for VCC1 and VCC2 on the MAX6721UTVDD3?
The MAX6721UTVDD3 has factory-trimmed reset thresholds of 4.625V for VCC1 and 3.075V for VCC2, with ±1.5% tolerance over -40°C to +125°C. These values are encoded in the "TV" and "DD" suffixes per Maxim's Reset Voltage Threshold Suffix Guide and do not require external resistor networks.
Does the MAX6721UTVDD3 support watchdog functionality, and how is it configured?
Yes, the MAX6721UTVDD3 includes a dual-mode watchdog timer with 35s minimum startup period after reset and 1.12s minimum normal timeout. It is enabled by connecting WDI to a µP GPIO; leaving WDI floating disables the watchdog. The first WDI edge after reset initiates the 1.12s mode.
What package type and pin count does the MAX6721UTVDD3 use?
The MAX6721UTVDD3 uses a 6-pin SOT23 package (JEDEC MO-178AA, 2.9mm × 1.6mm × 1.1mm). Pinout is confirmed in Maxim's datasheet Rev 3 (19-0536): Pin 1=RST, Pin 2=GND, Pin 3=MR, Pin 4=VCC2, Pin 5=VCC1, Pin 6=WDI.
Can the MAX6721UTVDD3 monitor a third voltage rail?
No, the MAX6721UTVDD3 is a dual-supply supervisor only. It monitors VCC1 and VCC2 exclusively. For triple-voltage monitoring, consider MAX6723A–MAX6727A variants which include the RSTIN input; the MAX6721UTVDD3 lacks RSTIN, PFI, PFO, and RST2 pins.
What is the reset output type and drive capability of the MAX6721UTVDD3?
The MAX6721UTVDD3 features a push-pull active-low RST output referenced to VCC1. It sinks up to 3.2mA at 4.5V (VOL ≤ 0.4V) and sources up to 800µA (VOH ≥ 0.8×VCC1), eliminating the need for an external pullup resistor and enabling direct connection to µP reset pins.
MAX6721UTVDD3 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SOT-23-6
- Packaging:
- Bulk
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Multi-Voltage Supervisor
- Number of Voltages Monitored:
- 2
- Voltage - Threshold:
- 0.788V, 1.575V
- 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-23-6
MAX6721UTVDD3 FAQ
1.How can I place an order for MAX6721UTVDD3 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6721UTVDD3 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 MAX6721UTVDD3 reliable?
The price and inventory of MAX6721UTVDD3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6721UTVDD3 is usually 5 days.
3.What payment methods are accepted for MAX6721UTVDD3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6721UTVDD3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6721UTVDD3?
MAX6721UTVDD3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6721UTVDD3 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 MAX6721UTVDD3?
For technical support, including MAX6721UTVDD3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6721UTVDD3 requirements.
6.How does Aetrix verify that MAX6721UTVDD3 is sourced from the original manufacturer or authorized distributors?
All MAX6721UTVDD3 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 MAX6721UTVDD3 meets industry standards.
7.What is the process for return or replacement of MAX6721UTVDD3?
All MAX6721UTVDD3 units undergo pre-shipment inspection (PSI). If there is an issue with MAX6721UTVDD3, 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 MAX6721UTVDD3 part is unused and in its original packaging.
Return procedure for MAX6721UTVDD3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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