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Analog Devices Inc./Maxim Integrated MAX6722UTZWD3
- Part No.:
- MAX6722UTZWD3
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-6
- Datasheet:
-
MAX6722UTZWD3.pdf
- Description:
- IC SUPERVISOR MPU
- Quantity:
- Payment:
- Shipping:
Inventory:2,500
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Product details
Overview
The MAX6722UTZWD3 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 battery-powered embedded controllers.
For engineers reviewing the MAX6722UTZWD3 datasheet, MAX6722UTZWD3 pinout, MAX6722UTZWD3 application, or MAX6722UTZWD3 equivalent, key selection criteria include dual-supply threshold accuracy (±1.5% over -40°C to +125°C), guaranteed reset validity down to VCC = 0.8V, low 14µA supply current at 3.6V, and integrated watchdog with long startup period for complex boot sequences.
Technical Context
This device implements a dual-threshold comparator architecture with independent VCC1 and VCC2 monitoring paths, each referencing factory-trimmed bandgap references. The reset logic combines asynchronous threshold violation detection with a digital timeout counter that restarts on any new fault event before timeout completion.
Its watchdog subsystem uses a dual-mode timer: a 35s minimum initial window after reset enables full system initialization, followed by a 1.12s minimum normal timeout triggered by WDI edge transitions. The RST output is push-pull referenced to VCC1, supporting direct interface to µP reset pins without external pullup.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC1 Threshold | 4.625V (factory-trimmed, ±1.5% tolerance over temp) |
| VCC2 Threshold | 3.075V (factory-trimmed, ±1.5% tolerance over temp) |
| Reset Timeout | 210ms (minimum duration reset remains asserted after recovery) |
| Watchdog Period | 35s min startup / 1.12s min normal mode (enables safe boot + rapid fault detection) |
| Supply Current | 14µA typical at 3.6V (enables >10-year battery life in always-on monitoring) |
| Operating Temp | -40°C to +125°C (supports automotive under-hood and industrial control environments) |
| Reset Validity | Guaranteed down to VCC1 or VCC2 = 0.8V (ensures clean reset assertion during deep brownout) |
Pinout & Package
Package: 6-pin SOT23, 1.6mm × 2.9mm footprint, surface-mount, RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RST/RST1 | Active-low push-pull reset output referenced to VCC1; asserts when either supply falls below threshold or MR pulled low |
| 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 (3.075V threshold monitor); powers internal VCC2 path circuitry |
| 5 | VCC1 | Primary supply input (4.625V threshold monitor); powers core logic and RST output stage |
| 6 | WDI | Watchdog input; rising/falling edges reset 1.12s timeout counter; unconnected disables watchdog |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent voltage monitoring | Simultaneous VCC1 (4.625V) and VCC2 (3.075V) supervision eliminates need for two discrete supervisors |
| Push-pull RST output | Drives µP reset pin directly without external pullup resistor, reducing BOM count and board space |
| Long-startup watchdog timer | 35s minimum initial timeout allows complete firmware boot and peripheral initialization before watchdog enforcement begins |
| Immunity to short VCC transients | Rejects <20µs negative glitches at 100mV overdrive, preventing spurious resets during switching noise |
| Low 14µA supply current | Enables use in energy-constrained applications like coin-cell–powered IoT sensors and portable medical devices |
Applications
| Industrial PLC I/O Module | Automotive Body Control Unit |
|---|---|
Use Scenario: Monitoring 5V main logic rail and 3.3V MCU core supply in programmable logic controller modules exposed to wide temperature swings and EMI. IC Role / Device Role / Timing Role: Dual-supply supervisor asserting reset if either rail drops below specification during cold cranking or load dump events. Use Value: Prevents corrupted firmware execution by guaranteeing reset assertion until both supplies stabilize above 4.625V and 3.075V respectively, with 210ms hold time ensuring clean state recovery. | Use Scenario: Supervising 12V-regulated 5V domain and 3.3V microcontroller supply in body control modules operating from -40°C to +125°C. IC Role / Device Role / Timing Role: Fault-detection engine triggering system reset during battery voltage sag or regulator failure, with watchdog guarding against software lockup. Use Value: Guarantees valid reset down to 0.8V on either supply, enabling fail-safe behavior even during severe brownout conditions common in automotive electrical systems. |
| Medical Infusion Pump Controller | Smart Energy Meter |
Use Scenario: Ensuring safe operation of battery-backed infusion pump MCU by monitoring primary 3.3V rail and backup 1.8V SRAM supply. IC Role / Device Role / Timing Role: Safety-critical reset generator with watchdog enforcing periodic software health checks during therapy delivery. Use Value: 14µA quiescent current extends battery life while 35s watchdog startup accommodates full self-test sequence before enabling motor control. | Use Scenario: Supervising isolated 3.3V communication interface and 1.8V metrology ASIC supply in utility-grade electricity meters. IC Role / Device Role / Timing Role: Dual-rail integrity monitor detecting undervoltage on either domain to prevent data corruption during power line disturbances. Use Value: Factory-trimmed thresholds (±1.5%) ensure precise trip points across temperature, critical for maintaining metering accuracy compliance under varying grid conditions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-voltage supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6720UTZD3+T | No watchdog timer; identical dual-threshold (4.625V/3.075V) and 210ms timeout | Suitable where software-level fault detection suffices and hardware watchdog is unnecessary | Select when system already implements robust software watchdog or requires lower cost and simpler BOM |
| TPS3808G33DBVR | Single-supply monitor (3.3V threshold only); no VCC2 input or dual-threshold capability | Requires separate supervisor for secondary rail; lacks integrated dual-monitoring function | Choose only if redesigning to single-rail architecture or needing TI's enhanced ESD performance (4kV HBM) |
Compared with MAX6722UTZWD3, MAX6720UTZD3+T removes watchdog functionality but retains identical voltage thresholds and timing-ideal for cost-sensitive designs without runtime software monitoring needs-while TPS3808G33DBVR provides single-rail supervision with different process technology and qualification, requiring additional components to replicate dual-rail coverage.
Availability
MAX6722UTZWD3 is available at Aetrix Electronics and suitable for industrial PLC I/O modules, automotive body control units, and medical infusion pump controllers requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for MAX6722UTZWD3 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 medical applications.
The MAX6715A–MAX6729A family delivers ultra-low-voltage microprocessor supervisory circuits optimized for dual- or triple-rail power monitoring in space-constrained, high-reliability embedded systems.
FAQ
What is the exact reset threshold voltage for VCC1 and VCC2 on the MAX6722UTZWD3?
The MAX6722UTZWD3 has factory-trimmed reset thresholds of 4.625V for VCC1 and 3.075V for VCC2, with ±1.5% tolerance over the full -40°C to +125°C temperature range. These values are encoded in the part number suffix "TZWD3", where "TZ" denotes the dual-threshold combination and "D3" specifies the 210ms timeout period. The MAX6722UTZWD3 datasheet confirms these thresholds are guaranteed by production test at temperature extremes.
Does the MAX6722UTZWD3 support manual reset functionality?
Yes, the MAX6722UTZWD3 includes an active-low manual-reset input (MR) on Pin 3 with an internal 50kΩ pullup resistor to VCC1. Pulling MR low forces an immediate reset assertion, which remains active for the full 210ms timeout period after MR returns high. This feature enables operator-initiated resets, test-mode entry, or external logic-triggered recovery-fully documented in the MAX6722UTZWD3 functional description and pin configuration tables.
How does the watchdog timer operate on the MAX6722UTZWD3?
The MAX6722UTZWD3 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 triggered by WDI edge transitions. The WDI pin (Pin 6) must see a rising or falling edge within each 1.12s window during normal operation; failure causes reset assertion. Leaving WDI unconnected disables the watchdog, as confirmed in the MAX6722UTZWD3 detailed description section.
What package type and pin count does the MAX6722UTZWD3 use?
The MAX6722UTZWD3 uses a 6-pin SOT23 package (1.6mm × 2.9mm footprint) with gull-wing leads, RoHS-compliant and tape-and-reel packaged. This matches the ordering information table in the MAX6722UTZWD3 datasheet, which lists "6 SOT23" under the PIN-PACKAGE column for all MAX672x variants with "UT" prefix. The pinout is validated across multiple figures including the typical operating circuit and pin description tables.
Is the MAX6722UTZWD3 reset output push-pull or open-drain?
The MAX6722UTZWD3 features a push-pull active-low RST output (Pin 1) referenced to VCC1, eliminating the need for an external pullup resistor. This is confirmed by the "Selector Guide" and "Pin Description" sections of the MAX6722UTZWD3 datasheet, which classify it under the MAX6716A/MAX6718A/MAX6720A/MAX6722A/MAX6724A/MAX6726A/MAX6729A/MAX6797A group-designated as push-pull output variants. The electrical characteristics table further specifies VOH and VOL limits consistent with push-pull drive capability.
MAX6722UTZWD3 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SOT-23-6
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Power Supply Monitor
- Number of Voltages Monitored:
- 2
- Voltage - Threshold:
- 1.665V, 2.313V
- Output:
- Push-Pull, Totem Pole
- 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
MAX6722UTZWD3 FAQ
1.How can I place an order for MAX6722UTZWD3 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6722UTZWD3 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 MAX6722UTZWD3 reliable?
The price and inventory of MAX6722UTZWD3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6722UTZWD3 is usually 5 days.
3.What payment methods are accepted for MAX6722UTZWD3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6722UTZWD3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6722UTZWD3?
MAX6722UTZWD3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6722UTZWD3 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 MAX6722UTZWD3?
For technical support, including MAX6722UTZWD3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6722UTZWD3 requirements.
6.How does Aetrix verify that MAX6722UTZWD3 is sourced from the original manufacturer or authorized distributors?
All MAX6722UTZWD3 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 MAX6722UTZWD3 meets industry standards.
7.What is the process for return or replacement of MAX6722UTZWD3?
All MAX6722UTZWD3 units undergo pre-shipment inspection (PSI). If there is an issue with MAX6722UTZWD3, 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 MAX6722UTZWD3 part is unused and in its original packaging.
Return procedure for MAX6722UTZWD3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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