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Analog Devices Inc./Maxim Integrated MAX6721UTVHD3
- Part No.:
- MAX6721UTVHD3
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-6
- Datasheet:
-
MAX6721UTVHD3.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:259
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Product details
Overview
MAX6721UTVHD3 from Maxim Integrated is a dual-voltage microprocessor supervisory IC monitoring VCC1 (primary supply) and VCC2 (secondary supply), with factory-trimmed reset thresholds of 3.075V (VTH1) and 1.388V (VTH2), 210ms minimum reset timeout, watchdog timer (35s startup / 1.12s normal mode), and push-pull active-low RST output. It ensures reliable system reset in battery-powered telecom equipment and industrial controllers during brownout or power-up.
For engineers reviewing the MAX6721UTVHD3 datasheet, MAX6721UTVHD3 pinout, MAX6721UTVHD3 application, or MAX6721UTVHD3 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 typical supply current at 3.6V, and integrated watchdog with long startup period for complex boot sequences.
Technical Context
The MAX6721UTVHD3 implements dual independent voltage comparators with 20ppm/°C tempco and 0.5% hysteresis referenced to VTH typical, enabling stable reset assertion across automotive-grade temperature range (-40°C to +125°C). Its internal watchdog uses dual-mode timing: 35s min initial window after any reset event, then automatic transition to 1.12s min normal timeout upon first WDI edge detection.
Reset logic is asserted when either VCC1 falls below 3.075V or VCC2 drops below 1.388V, with propagation delay under 20µs. The push-pull RST output is referenced to VCC1 and guarantees VOL ≤ 0.4V at ISINK = 3.2mA, supporting direct interface to 1.8V–5V µP reset inputs without external pullup.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC1 Threshold | 3.075V (factory-trimmed, ±1.5% over temp) - sets primary supply brownout detection point for 3.3V systems |
| VCC2 Threshold | 1.388V (factory-trimmed, ±1.5% over temp) - enables reliable monitoring of 1.5V/1.8V core supplies |
| Reset Timeout | 210ms (min) - ensures µP completes initialization before releasing reset |
| Watchdog Period | 35s (startup), 1.12s (normal) - accommodates lengthy firmware boot while maintaining runtime fault detection |
| Supply Current | 14µA (typ @ 3.6V) - minimizes quiescent drain in always-on battery backup circuits |
| Operating Temp | -40°C to +125°C - supports deployment in under-hood automotive or industrial control environments |
| Reset Validity | Down to VCC1 or VCC2 = 0.8V - guarantees correct reset state during deep brownout conditions |
Pinout & Package
MAX6721UTVHD3 is housed in a 6-pin SOT23 package (2.9mm × 1.6mm × 1.1mm), RoHS-compliant and tape-and-reel packaged.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - RST | Active-Low Reset Output | Push-pull, referenced to VCC1; asserts low on threshold violation and holds for 210ms timeout |
| 2 - GND | Ground Reference | Common return for all internal comparators, watchdog, and output drivers |
| 3 - MR | Active-Low Manual-Reset Input | Internal 50kΩ pullup to VCC1; forces reset when pulled low, with 200ns response |
| 4 - VCC2 | Secondary Supply Input | Powers internal circuitry when VCC2 > VCC1; input for 1.388V threshold comparator |
| 5 - VCC1 | Primary Supply Input | Main power rail; powers device and serves as reference for RST output and 3.075V threshold comparator |
| 6 - WDI | Watchdog Input | Edge-sensitive; resets watchdog timer on rising/falling transition; unconnected disables function |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent voltage monitoring | Simultaneous VCC1 (3.075V) and VCC2 (1.388V) supervision eliminates need for two discrete supervisors |
| Guaranteed reset validity at 0.8V | Ensures deterministic reset behavior during severe brownout-no external undervoltage lockout required |
| Integrated dual-mode watchdog | 35s startup window prevents false timeout during boot; 1.12s runtime window catches software hangs |
| Low 14µA supply current | Enables multi-year operation on coin-cell backup in portable medical or IoT edge devices |
| Immunity to short VCC transients | Rejects <20µs glitches below threshold-reduces spurious resets in noisy industrial power rails |
Applications
| Telecom Line Card Power Management | Industrial PLC I/O Module |
|---|---|
Use Scenario: Monitoring 3.3V backplane supply and 1.5V FPGA core rail in carrier-grade line cards with hot-swap capability. IC Role / Device Role / Timing Role: Dual-supply supervisor asserting reset if either rail dips below spec during insertion or transient load events. Use Value: Prevents FPGA configuration corruption by holding reset until both supplies stabilize post-hot-swap, using 210ms timeout aligned with power sequencer timing. | Use Scenario: Ensuring safe startup and fault recovery in modular PLC I/O bases with isolated 24V field power and 3.3V logic rails. IC Role / Device Role / Timing Role: Supervising primary 3.3V logic supply and secondary 24V-to-3.3V converter output; manual reset via front-panel button. Use Value: Guarantees µP remains held in reset during 24V field power ramp-up (typically 100–200ms), matching actual converter settling time. |
| Battery-Powered Medical Monitor | Automotive Body Control Module |
Use Scenario: Managing Li-ion backup path in portable ECG monitors where main 5V rail may drop during battery switchover. IC Role / Device Role / Timing Role: Monitoring main 5V DC-DC output (VCC1) and 3.3V MCU rail (VCC2); watchdog guards against firmware lockup during sensor acquisition. Use Value: 14µA quiescent current extends backup runtime; 35s watchdog startup avoids timeout during 30s boot sequence. | Use Scenario: Supervising 5V infotainment SoC supply and 1.2V GPU core rail in under-dash BCMs exposed to cold-crank transients. IC Role / Device Role / Timing Role: Detecting brownout on both rails simultaneously; reset output drives SoC nRESET with push-pull drive strength. Use Value: Guaranteed reset validity down to 0.8V prevents erratic behavior during 4.2V cold-crank events; 20ppm/°C tempco maintains accuracy across -40°C to +125°C. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-supply supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS3808G33DBVR | Single-supply (3.3V only), no VCC2 monitoring; 200ms timeout; no integrated watchdog | Suitable only for single-rail systems; lacks dual-threshold capability and watchdog safety feature | Select when only primary 3.3V rail supervision is needed and watchdog is implemented externally |
| ADM6705ARTZ-REEL7 | Triple-supply (VCC/VDD/VBAT), 140ms timeout, open-drain RST, no watchdog | Supports battery backup monitoring but requires external pullup; no runtime processor activity monitoring | Prefer for systems needing VBAT supervision alongside main rails, where watchdog is unnecessary |
Compared with TPS3808G33DBVR and ADM6705ARTZ-REEL7, MAX6721UTVHD3 uniquely delivers dual independent supply monitoring with factory-trimmed thresholds, integrated dual-mode watchdog, and push-pull RST-enabling compact, self-contained reset management without external components or firmware overhead.
Availability
MAX6721UTVHD3 is available at Aetrix Electronics and suitable for telecom infrastructure, industrial PLCs, and battery-powered medical devices requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6721UTVHD3 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 µP supervisory circuits optimized for dual/triple supply monitoring in space-constrained, high-reliability systems operating from -40°C to +125°C.
FAQ
What are the factory-trimmed reset threshold voltages for MAX6721UTVHD3?
The MAX6721UTVHD3 has factory-trimmed reset thresholds of 3.075V for VCC1 (primary supply) and 1.388V for VCC2 (secondary supply), with ±1.5% tolerance over -40°C to +125°C. These values are encoded in the part number suffix "TVH"-"T" indicates 3.075V VTH1 and "H" indicates 1.388V VTH2 per Maxim's Reset Voltage Threshold Suffix Guide. The MAX6721UTVHD3 does not support adjustable RSTIN monitoring.
Does MAX6721UTVHD3 include a watchdog timer, and what are its timing characteristics?
Yes, MAX6721UTVHD3 includes an integrated dual-mode watchdog timer. After any reset event (power-up, brownout, or manual reset), it enters a 35s minimum startup period to allow full system initialization. Upon detection of the first valid WDI edge, it transitions to normal mode with a 1.12s minimum timeout. The MAX6721UTVHD3 watchdog is disabled when WDI is left floating, using a 200nA internal current source for unconnected-state detection.
What is the reset timeout period for MAX6721UTVHD3, and how is it set?
The MAX6721UTVHD3 has a fixed 210ms minimum reset timeout period, indicated by the "D3" suffix in the part number. This timeout begins when VCC1/VCC2 rise above their respective thresholds and ensures the reset signal remains asserted long enough for microprocessors to complete power-on initialization. The timeout is internally generated and does not require external components-unlike variants with "D1", "D2", or "D5" suffixes which offer different durations.
Is MAX6721UTVHD3 compatible with 1.8V microcontrollers, and what output drive capability does it provide?
Yes, MAX6721UTVHD3 is fully compatible with 1.8V µPs. Its push-pull RST output is referenced to VCC1 and guarantees VOH ≥ 0.8 × VCC1 and VOL ≤ 0.4V at ISINK = 3.2mA-even when VCC1 = 1.8V. This eliminates the need for external level-shifting or pullup resistors. The MAX6721UTVHD3 also ensures reset validity down to VCC1 = 0.8V, making it robust for low-voltage brownout scenarios common in 1.8V systems.
How does the manual-reset input (MR) function on MAX6721UTVHD3?
The MR pin on MAX6721UTVHD3 is an active-low input with an internal 50kΩ pullup to VCC1. Pulling MR low forces an immediate reset assertion, which remains active for the full 210ms timeout period after MR returns high. The MAX6721UTVHD3 specifies a 200ns MR-to-RST delay and 1µs minimum MR pulse width. If unused, MR may be left unconnected or tied to VCC1-no external components are required for basic operation.
MAX6721UTVHD3 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, 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
MAX6721UTVHD3 FAQ
1.How can I place an order for MAX6721UTVHD3 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6721UTVHD3 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 MAX6721UTVHD3 reliable?
The price and inventory of MAX6721UTVHD3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6721UTVHD3 is usually 5 days.
3.What payment methods are accepted for MAX6721UTVHD3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6721UTVHD3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6721UTVHD3?
MAX6721UTVHD3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6721UTVHD3 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 MAX6721UTVHD3?
For technical support, including MAX6721UTVHD3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6721UTVHD3 requirements.
6.How does Aetrix verify that MAX6721UTVHD3 is sourced from the original manufacturer or authorized distributors?
All MAX6721UTVHD3 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 MAX6721UTVHD3 meets industry standards.
7.What is the process for return or replacement of MAX6721UTVHD3?
All MAX6721UTVHD3 units undergo pre-shipment inspection (PSI). If there is an issue with MAX6721UTVHD3, 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 MAX6721UTVHD3 part is unused and in its original packaging.
Return procedure for MAX6721UTVHD3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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