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Analog Devices Inc./Maxim Integrated MAX6721UTSYD3
- Part No.:
- MAX6721UTSYD3
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-6
- Datasheet:
-
MAX6721UTSYD3.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:1,321
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Product details
Overview
The MAX6721UTSYD3 from Maxim Integrated is a dual-voltage microprocessor supervisory circuit 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), manual-reset input, and push-pull active-low RST output. It ensures reliable power-up sequencing and brownout detection in battery-powered and industrial embedded systems.
For engineers reviewing the MAX6721UTSYD3 datasheet, MAX6721UTSYD3 pinout, MAX6721UTSYD3 application, or MAX6721UTSYD3 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 with long startup period for complex boot sequences.
Technical Context
The MAX6721UTSYD3 implements dual independent voltage comparators with factory-trimmed thresholds (VTH1 = 4.625V, VTH2 = 3.075V), a 210ms minimum reset timeout timer, and a dual-mode watchdog with 35s minimum startup delay followed by 1.12s minimum normal timeout. Reset assertion occurs when either VCC1 or VCC2 falls below its threshold, MR is pulled low, or WDI fails to toggle within timeout.
It features push-pull RST output referenced to VCC1, internal 50kΩ MR pullup, 626mV RSTIN reference for optional third-voltage monitoring, and immunity to VCC transients ≤20µs at 100mV overdrive. All specifications are guaranteed over -40°C to +125°C with supply voltage range 0.8V–5.5V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC1 Threshold | 4.625V (factory-trimmed, ±1.5% over temp, enables precise 5V rail supervision) |
| VCC2 Threshold | 3.075V (factory-trimmed, ±1.5% over temp, supports 3.3V I/O rail monitoring) |
| Reset Timeout | 210ms (min), ensures µP reset hold time meets ARM Cortex-M and x86 boot requirements) |
| Watchdog Timeout | 35s (min startup), 1.12s (min normal), prevents false resets during boot while enabling fast fault detection in runtime |
| Supply Current | 14µA (typ at 3.6V), enables >10-year battery life in always-on IoT sensor nodes |
| Operating Temp | -40°C to +125°C, qualified for under-hood automotive and industrial control environments |
| Reset Validity | Down to VCC1 or VCC2 = 0.8V, guarantees correct logic state during deep brownout conditions |
Pinout & Package
Package: 6-pin SOT23 (2.9mm × 1.6mm × 1.1mm, JEDEC MO-178AA). RoHS-compliant, tape-and-reel packaging.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - RST | Active-low reset output | Push-pull, referenced to VCC1; asserts low on fault and holds for 210ms after recovery |
| 2 - GND | Ground reference | Common return for all internal comparators, timers, and outputs; requires low-impedance connection |
| 3 - MR | Manual-reset input | Active-low, internally pulled up to VCC1 (50kΩ); pulse ≥1µs forces reset regardless of supply status |
| 4 - VCC2 | Secondary supply input | Powers internal VCC2 comparator and RST2 logic; monitors 3.075V threshold with ±1.5% accuracy |
| 5 - VCC1 | Primary supply input | Powers device core and VCC1 comparator; monitors 4.625V threshold with ±1.5% accuracy |
| 6 - WDI | Watchdog input | Accepts CMOS-level transitions; unconnected disables watchdog; 200nA detection current limits external drive |
Key Features
| Feature | Design Value |
|---|---|
| Dual factory-trimmed voltage monitoring | Enables simultaneous supervision of 5V primary and 3.3V secondary rails without external resistors or calibration |
| 210ms reset timeout with temperature stability | Guaranteed minimum duration across -40°C to +125°C, eliminating need for external RC timing components |
| Dual-mode watchdog timer | 35s startup window accommodates full system boot; 1.12s runtime timeout detects software hangs within milliseconds |
| Guaranteed reset validity down to 0.8V | Ensures deterministic behavior during severe brownout-critical for fail-safe shutdown in automotive ECUs |
| Low 14µA quiescent current | Reduces standby power in battery-backed real-time clocks and security modules without compromising supervision integrity |
Applications
| Industrial PLC I/O Modules | Automotive Body Control Units |
|---|---|
|
Use Scenario: Monitoring 5V CAN transceiver supply and 3.3V microcontroller I/O rail in harsh under-dash environments. IC Role / Device Role / Timing Role: Dual-supply supervisor asserting reset if either rail drops below spec during load dump or cold-crank events. Use Value: Prevents corrupted CAN message transmission and MCU lockup by enforcing 210ms reset hold time and validating reset down to 0.8V. |
Use Scenario: Supervising 5V power domain for LIN gateway and 3.3V domain for EEPROM and sensor interface in body control module. IC Role / Device Role / Timing Role: Ensures safe power-down sequence and detects undervoltage on critical supplies before firmware executes safety routines. Use Value: Guarantees reset assertion during battery voltage sag (<6.5V), leveraging 4.625V/3.075V thresholds matched to automotive supply tolerances. |
| Medical Portable Diagnostic Devices | Industrial Wireless Sensor Nodes |
|
Use Scenario: Power supervision for 5V analog front-end and 3.3V ARM Cortex-M4 processor in handheld ultrasound units. IC Role / Device Role / Timing Role: Dual-rail monitor with watchdog ensuring firmware recovers from memory corruption during battery swap or ESD event. Use Value: 35s watchdog startup avoids false resets during multi-stage boot; 14µA ICC enables >5-year shelf life on primary lithium battery. |
Use Scenario: Supervising 3.6V Li-ion supply and 1.8V ultra-low-power MCU core in battery-operated vibration sensors. IC Role / Device Role / Timing Role: Monitors both rails simultaneously and triggers reset if either falls below threshold during RF transmission surge. Use Value: Factory-trimmed thresholds eliminate calibration overhead; 0.8V reset validity ensures operation through full battery discharge curve. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-voltage supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6326UTR31D3-T | Single-supply (3.08V threshold), no watchdog, 200ms timeout, same 6-pin SOT23 package | Lacks dual-rail monitoring and watchdog-suitable only for single-rail systems requiring minimal BOM count | Select when supervising only one supply and watchdog functionality is handled externally or not required |
| TPS3808G33DBVR | Single-supply (3.3V threshold), no VCC2 input, 200ms timeout, includes PFI/PFO, 5-pin SOT23 | Supports power-fail warning but cannot monitor two independent supplies simultaneously | Choose for cost-sensitive designs needing basic 3.3V supervision with early power-fail alert, not dual-rail integrity |
Compared with MAX6721UTSYD3, MAX6326UTR31D3-T reduces feature set to single-rail supervision without watchdog, while TPS3808G33DBVR trades dual-supply capability for power-fail signaling-neither provides the combined dual-threshold, watchdog, and 0.8V reset validity of the MAX6721UTSYD3.
Availability
MAX6721UTSYD3 is available at Aetrix Electronics and suitable for industrial control systems, automotive body electronics, and portable medical devices requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for MAX6721UTSYD3 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 MAX6715A–MAX6729A family delivers ultra-low-voltage, dual/triple-supply supervisory circuits optimized for reliability-critical embedded systems where simultaneous rail monitoring and deterministic reset behavior are mandatory.
FAQ
What is the exact reset threshold voltage for VCC1 and VCC2 on the MAX6721UTSYD3?
The MAX6721UTSYD3 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 part number suffix 'TS' (VCC1) and 'Y' (VCC2) per Maxim's Reset Voltage Threshold Suffix Guide, and are verified in the Electrical Characteristics table of the official datasheet.
Does the MAX6721UTSYD3 support triple-voltage monitoring?
No, the MAX6721UTSYD3 is a dual-supply supervisor monitoring only VCC1 and VCC2. While the MAX6721A variant series includes RSTIN for adjustable third-voltage monitoring, the MAX6721UTSYD3 does not connect or enable the RSTIN pin-it is unused and must be tied to VCC1 or GND per datasheet recommendations.
What is the function of the WDI pin on the MAX6721UTSYD3 and how is it disabled?
The WDI pin on the MAX6721UTSYD3 enables the dual-mode watchdog timer. To disable it, leave WDI unconnected-the device uses a 200nA internal current source to detect the open state. Connecting any external source exceeding 50nA may prevent proper disable functionality, per the datasheet's WDI unconnected-state detector specification.
Can the MAX6721UTSYD3 operate reliably during severe supply brownout conditions?
Yes, the MAX6721UTSYD3 guarantees valid reset output logic state down to VCC1 or VCC2 = 0.8V, confirmed in Absolute Maximum Ratings and Electrical Characteristics sections. This ensures deterministic reset assertion even during deep brownout events common in automotive cold-crank and industrial line-dip scenarios.
What package type and footprint does the MAX6721UTSYD3 use?
The MAX6721UTSYD3 uses a 6-pin SOT23 package (JEDEC MO-178AA), measuring 2.9mm × 1.6mm × 1.1mm. Its pinout matches standard SOT23-6 footprints, with pin 1 (RST) at the marked end, and is compatible with reflow soldering per JEDEC J-STD-020 moisture sensitivity level 1.
MAX6721UTSYD3 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:
- 2.188V, 2.925V
- 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
MAX6721UTSYD3 FAQ
1.How can I place an order for MAX6721UTSYD3 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6721UTSYD3 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 MAX6721UTSYD3 reliable?
The price and inventory of MAX6721UTSYD3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6721UTSYD3 is usually 5 days.
3.What payment methods are accepted for MAX6721UTSYD3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6721UTSYD3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6721UTSYD3?
MAX6721UTSYD3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6721UTSYD3 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 MAX6721UTSYD3?
For technical support, including MAX6721UTSYD3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6721UTSYD3 requirements.
6.How does Aetrix verify that MAX6721UTSYD3 is sourced from the original manufacturer or authorized distributors?
All MAX6721UTSYD3 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 MAX6721UTSYD3 meets industry standards.
7.What is the process for return or replacement of MAX6721UTSYD3?
All MAX6721UTSYD3 units undergo pre-shipment inspection (PSI). If there is an issue with MAX6721UTSYD3, 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 MAX6721UTSYD3 part is unused and in its original packaging.
Return procedure for MAX6721UTSYD3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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