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Analog Devices Inc./Maxim Integrated MAX6721UTYHD3
- Part No.:
- MAX6721UTYHD3
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-6
- Datasheet:
-
MAX6721UTYHD3.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:880
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Product details
Overview
MAX6721UTYHD3 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), and push-pull active-low RST output. It ensures reliable system reset during power-up, brownout, or software fault in embedded controllers requiring dual-rail validation.
For engineers reviewing the MAX6721UTYHD3 datasheet, MAX6721UTYHD3 pinout, MAX6721UTYHD3 application, or MAX6721UTYHD3 equivalent, key selection criteria include guaranteed reset validity down to VCC1/VCC2 = 0.8V, 14µA typical supply current at 3.6V, immunity to sub-20µs VCC transients, and integrated manual-reset input with 50kΩ internal pullup.
Technical Context
The MAX6721UTYHD3 implements dual independent voltage comparators with factory-trimmed thresholds (VTH1 = 4.625V, VTH2 = 3.075V), a dual-mode watchdog timer (35s min startup delay followed by 1.12s min normal timeout), and push-pull reset assertion referenced to VCC1. Its reset logic remains valid across -40°C to +125°C when either supply exceeds 0.8V.
It features a dedicated WDI input with 200nA unconnected-state detection, MR input with 1µs minimum pulse width and 100ns glitch rejection, and supports external RSTIN monitoring via 626.5mV internal reference - though RSTIN is not implemented in this variant per pin configuration data.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC1 Reset Threshold | 4.625V (factory-trimmed, ±125mV tolerance) - sets primary supply brownout detection point for 5V rail systems |
| VCC2 Reset Threshold | 3.075V (factory-trimmed, ±75mV tolerance) - enables reliable monitoring of 3.3V auxiliary rails |
| Reset Timeout Period | 210ms (minimum) - ensures µP completes boot sequence before release from reset |
| Watchdog Timeout | 35s (startup mode), 1.12s (normal mode) - accommodates long firmware initialization then tight runtime supervision |
| Supply Current | 14µA (typical at 3.6V) - minimizes quiescent load on battery-backed or low-power systems |
| Operating Temperature | -40°C to +125°C - qualified for under-hood automotive, industrial control, and telecom equipment |
| Reset Output Type | Push-pull active-low RST - eliminates need for external pullup resistor; VOH ≥ 0.8×VCC1 at 800µA |
Pinout & Package
MAX6721UTYHD3 is housed in a RoHS-compliant 6-pin SOT23 package (2.9mm × 1.6mm × 1.1mm), optimized for space-constrained PCB layouts in portable and industrial applications.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RST/RST1 | Active-low push-pull reset output referenced to VCC1; asserts when VCC1/VCC2 drops below threshold or MR pulled low |
| 2 | GND | Ground reference for all internal comparators, timers, and output drivers |
| 3 | MR | Active-low manual-reset input with 50kΩ internal pullup to VCC1; 1µs minimum pulse width required |
| 4 | VCC2 | Secondary supply input powering VCC2 comparator and enabling dual-rail monitoring capability |
| 5 | VCC1 | Primary supply input powering device core and VCC1 comparator; determines RST output voltage levels |
| 6 | WDI | Watchdog input with 200nA unconnected-state detector; rising/falling edge clears timer; left open disables watchdog |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent voltage monitoring | Simultaneous VCC1 (4.625V) and VCC2 (3.075V) supervision with separate comparators and hysteresis |
| Dual-mode watchdog timer | 35s startup window allows full system boot; 1.12s runtime timeout detects stalled firmware execution |
| Guaranteed reset validity | Reset output remains functional even when VCC1 or VCC2 drops to 0.8V - critical for graceful shutdown |
| Low-glitch immunity | Immune to VCC transients <20µs duration (at 100mV overdrive), reducing false resets in noisy environments |
| Integrated manual reset | MR pin includes internal 50kΩ pullup and 100ns glitch rejection - eliminates external components for basic reset button interface |
Applications
| Industrial PLC Controller | Automotive Body Control Module |
|---|---|
Use Scenario: Monitors 5V main logic rail and 3.3V microcontroller core supply in programmable logic controllers operating in harsh factory environments. IC Role / Device Role / Timing Role: Dual-supply supervisor asserting reset if either rail sags below specification during motor switching or EMI events. Use Value: Prevents corrupted I/O state or firmware lockup by enforcing 210ms minimum reset hold time after recovery. |
Use Scenario: Validates battery-backed 5V domain and isolated 3.3V MCU supply in vehicle door modules exposed to cold cranking and load dump. IC Role / Device Role / Timing Role: Ensures deterministic reset during 0.8V brownout conditions common during engine start. Use Value: Guarantees reset assertion integrity down to VCC = 0.8V, eliminating need for external undervoltage lockout circuitry. |
| Telecom Line Card | Medical Infusion Pump |
Use Scenario: Supervises primary 5V DC-DC output and secondary 3.3V FPGA supply in carrier-grade Ethernet line cards with hot-swap capability. IC Role / Device Role / Timing Role: Dual-rail monitoring combined with watchdog prevents silent firmware hangs during packet processing overload. Use Value: 1.12s watchdog timeout provides rapid fault detection without compromising boot-time margin. |
Use Scenario: Controls safe power-on sequencing and runtime supervision of 5V pump motor driver and 3.3V safety-critical MCU in Class II medical devices. IC Role / Device Role / Timing Role: Push-pull RST output directly drives reset pins of dual MCUs without external pullups, simplifying BOM. Use Value: 14µA supply current extends battery life in portable infusion systems while maintaining full watchdog coverage. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-voltage supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6720UTYHD3 | No watchdog timer; identical VTH1/VTH2 thresholds and 210ms timeout | Suitable where software-level fault detection suffices and hardware watchdog adds unnecessary complexity | Select when system-level watchdog is handled externally or not required for safety certification |
| TPS3808G33DBVR | Single-supply monitor (3.3V only); 200ms timeout; open-drain RST; no WDI or MR | Limited to single-rail systems; requires external pullup; lacks manual reset and watchdog capabilities | Choose only for cost-sensitive, single-voltage applications where dual-rail supervision is unnecessary |
Compared with MAX6721UTYHD3, MAX6720UTYHD3 removes watchdog functionality while retaining identical dual-threshold supervision and timing, whereas TPS3808G33DBVR reduces feature set to basic single-rail monitoring - making MAX6721UTYHD3 the only option supporting both dual-voltage validation and hardware-level processor activity supervision in one 6-pin SOT23 device.
Availability
MAX6721UTYHD3 is available at Aetrix Electronics and suitable for industrial PLC controllers, automotive body control modules, and telecom line cards requiring stable component supply with extended temperature qualification and long-term lifecycle support.
Supply support for MAX6721UTYHD3 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, emphasizing reliability, low power, and high integration.
The MAX6715A–MAX6729A family delivers ultra-low-voltage dual/triple supervisory circuits targeting space-constrained embedded systems needing robust power-rail validation and hardware watchdog protection across extended temperature ranges.
FAQ
What is the exact reset threshold voltage for VCC1 on MAX6721UTYHD3?
The MAX6721UTYHD3 has a factory-trimmed VCC1 reset threshold of 4.625V (±125mV) - confirmed by the 'T' suffix in the ordering code per Maxim's Reset Voltage Threshold Suffix Guide. This value is fixed and non-adjustable, ensuring precise detection of 5V rail brownout conditions without external components.
Does MAX6721UTYHD3 support monitoring a third voltage rail?
No, MAX6721UTYHD3 does not implement the RSTIN input - its pinout (6-pin SOT23) omits RSTIN functionality. Only variants like MAX6723A–MAX6727A include RSTIN for adjustable third-rail monitoring. MAX6721UTYHD3 is strictly a dual-supply supervisor with VCC1 and VCC2 inputs.
How is the watchdog timer configured on MAX6721UTYHD3?
The MAX6721UTYHD3 watchdog operates in dual-mode: a 35s minimum startup period after any reset event (power-up, MR, or watchdog timeout), followed by a 1.12s minimum normal timeout. The timer resets on any WDI edge; leaving WDI unconnected disables it entirely via an internal 200nA detection circuit.
What is the reset output type and drive capability of MAX6721UTYHD3?
MAX6721UTYHD3 features a push-pull active-low RST output referenced to VCC1. It sources ≥0.8×VCC1 at 800µA and sinks ≤0.4V at 3.2mA, eliminating the need for an external pullup resistor and enabling direct connection to µP reset pins with bidirectional or open-drain interfaces.
Is MAX6721UTYHD3 qualified for automotive applications?
Yes, MAX6721UTYHD3 is specified for -40°C to +125°C operation and features guaranteed reset validity down to VCC1/VCC2 = 0.8V - meeting AEC-Q100 stress test requirements for automotive body electronics. Its 6-pin SOT23 package supports reflow soldering and meets RoHS compliance standards.
MAX6721UTYHD3 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:
- 1.313V, 2.188V
- 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
MAX6721UTYHD3 FAQ
1.How can I place an order for MAX6721UTYHD3 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6721UTYHD3 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 MAX6721UTYHD3 reliable?
The price and inventory of MAX6721UTYHD3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6721UTYHD3 is usually 5 days.
3.What payment methods are accepted for MAX6721UTYHD3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6721UTYHD3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6721UTYHD3?
MAX6721UTYHD3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6721UTYHD3 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 MAX6721UTYHD3?
For technical support, including MAX6721UTYHD3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6721UTYHD3 requirements.
6.How does Aetrix verify that MAX6721UTYHD3 is sourced from the original manufacturer or authorized distributors?
All MAX6721UTYHD3 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 MAX6721UTYHD3 meets industry standards.
7.What is the process for return or replacement of MAX6721UTYHD3?
All MAX6721UTYHD3 units undergo pre-shipment inspection (PSI). If there is an issue with MAX6721UTYHD3, 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 MAX6721UTYHD3 part is unused and in its original packaging.
Return procedure for MAX6721UTYHD3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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