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Analog Devices Inc./Maxim Integrated MAX6722UTLTD3+
- Part No.:
- MAX6722UTLTD3+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- -
- Datasheet:
-
MAX6722UTLTD3+.pdf
- Description:
- MAX6722UTLTD3+
- Quantity:
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Product details
Overview
MAX6722UTLTD3+ from Maxim Integrated is a dual-voltage microprocessor supervisory circuit in SOT23-6 package, monitoring VCC1 (4.625V threshold) and VCC2 (3.075V threshold) with 210ms minimum reset timeout, watchdog timer (1.12s normal / 35s startup), manual reset input, 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 MAX6722UTLTD3+ datasheet, MAX6722UTLTD3+ pinout, MAX6722UTLTD3+ application, or MAX6722UTLTD3+ equivalent, key selection criteria include dual-supply threshold accuracy (±1.5% over -40°C to +85°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 MAX6722UTLTD3+ implements independent voltage comparators for primary (VCC1) and secondary (VCC2) supplies, each with factory-trimmed thresholds (4.625V and 3.075V respectively), 20ppm/°C tempco, and 0.5% hysteresis. Reset assertion occurs when either supply falls below its threshold, and reset remains asserted for ≥210ms after both supplies recover.
It integrates a dual-mode watchdog timer: 35s minimum initial timeout after any reset event (power-on, MR, or watchdog timeout), followed by 1.12s minimum normal timeout triggered by WDI edge transitions. The push-pull RST output drives high to ≥0.8×VCC1 at 500µA source current and low to ≤0.4V at 3.2mA sink current.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC1 Threshold | 4.625V (factory-trimmed, ±1.5% over temperature; monitors main system rail) |
| VCC2 Threshold | 3.075V (factory-trimmed, ±1.5% over temperature; monitors I/O or auxiliary rail) |
| Reset Timeout | 210ms min (ensures µP completes power-on initialization before release) |
| Watchdog Timeout | 1.12s min normal mode; 35s min startup mode (supports bootloader execution) |
| Supply Current | 14µA typ at 3.6V (enables multi-year operation in coin-cell–powered systems) |
| Operating Temp | -40°C to +85°C (qualified for industrial and telecom equipment environments) |
| Reset Validity | Guaranteed down to VCC1 or VCC2 = 0.8V (prevents spurious release during deep brownout) |
Pinout & Package
MAX6722UTLTD3+ is housed in a 6-pin SOT23-6 package (2.9mm × 1.6mm × 1.1mm), RoHS-compliant and lead-free (+T suffix). Pin 1 is marked with dot; pin numbering follows standard SOT23 convention (counterclockwise from mark).
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RST | Active-low push-pull reset output referenced to VCC1; asserts low on fault and holds for 210ms timeout |
| 2 | GND | Analog/digital ground reference for all internal comparators and logic |
| 3 | MR | Active-low manual reset input with 50kΩ internal pullup to VCC1; debounced via 200ns delay |
| 4 | VCC2 | Secondary supply input (0.9V–3.3V range); powers internal VCC2 comparator and sets RST2 reference if used |
| 5 | VCC1 | Primary supply input (1.8V–5.0V range); powers device core and sets RST output reference |
| 6 | WDI | Watchdog input; rising/falling edges reset 1.12s timer; long idle (>35s) triggers reset |
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 | No external pullup required; drives high to ≥0.8×VCC1 at 500µA, enabling direct interface to µP reset pins |
| Dual-mode watchdog timer | 35s startup window prevents false timeout during boot; 1.12s runtime window detects firmware hangs |
| Manual reset with glitch rejection | 1µs minimum MR pulse width + 100ns glitch filter ensures noise-immune operator-initiated reset |
| Low-power operation | 14µA typical ICC at 3.6V enables integration into always-on subsystems without battery drain penalty |
Applications
| Industrial PLC Controller | Telecom Line Card |
|---|---|
Use Scenario: Monitors 5V main rail and 3.3V FPGA I/O rail in DIN-rail mounted programmable logic controller. IC Role / Device Role / Timing Role: Dual-supply supervisor asserting active-low reset to ARM Cortex-M7 and FPGA configuration logic. Use Value: Prevents partial initialization during AC line sags by holding reset until both rails stabilize for ≥210ms. |
Use Scenario: Embedded in carrier-grade Ethernet switch line card with hot-swap power sequencing. IC Role / Device Role / Timing Role: Supervises 12V DC-DC output (via resistor divider) and 3.3V management rail; feeds WDI from MAC controller GPIO. Use Value: 35s watchdog startup window accommodates PHY auto-negotiation and link training before enabling 1.12s runtime monitoring. |
| Medical Patient Monitor | Smart Energy Meter |
Use Scenario: Powers critical analog front-end and display subsystem from dual Li-ion cells (8.4V nominal, 6.0V min). IC Role / Device Role / Timing Role: Monitors buck-converted 3.3V logic rail and LDO-regulated 1.8V sensor rail; MR tied to emergency shutdown button. Use Value: Guaranteed reset validity down to 0.8V per rail ensures deterministic behavior during cell depletion and prevents corrupted ECG waveform capture. |
Use Scenario: Used in ANSI C12.20-certified electricity meter with isolated RS-485 and metrology SoC. IC Role / Device Role / Timing Role: Supervises 3.3V metrology domain and 5V communication domain; WDI driven by metrology interrupt handler. Use Value: 14µA supply current extends battery backup life beyond 10 years while maintaining tamper-detect reset integrity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-voltage supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6721UTLTD3+ | Same pinout, identical thresholds and timeout, but open-drain RST output requiring external pullup | Suitable where µP reset pin is bidirectional or requires level translation | Select MAX6721UTLTD3+ only if open-drain drive and external pullup are acceptable for your reset topology |
| TPS3808G33DBVR | Single-supply monitor (3.3V only), no watchdog, 200ms timeout, 1.6µA quiescent current | Lacks dual-rail monitoring and watchdog; suited for simpler, ultra-low-power applications | Choose TPS3808G33DBVR only when monitoring one rail and omitting watchdog functionality is acceptable |
Compared with MAX6722UTLTD3+, MAX6721UTLTD3+ offers identical supervision accuracy and timing but requires external pullup for RST, while TPS3808G33DBVR reduces supply current by 90% but sacrifices dual-rail capability and watchdog safety coverage-making MAX6722UTLTD3+ optimal for robust, feature-complete embedded supervision.
Availability
MAX6722UTLTD3+ is available at Aetrix Electronics and suitable for industrial PLC controllers, telecom line cards, medical patient monitors, and smart energy meters requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6722UTLTD3+ 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 MAX6715–MAX6729 family delivers ultra-low-voltage, multi-rail supervision with integrated watchdog and manual reset-targeting space-constrained, battery-sensitive embedded systems requiring fail-safe power sequencing and firmware health monitoring.
FAQ
What are the exact reset threshold voltages for MAX6722UTLTD3+?
The MAX6722UTLTD3+ has factory-trimmed reset thresholds of 4.625V for VCC1 and 3.075V for VCC2, with ±1.5% tolerance over -40°C to +85°C and 20ppm/°C tempco. These values are fixed by the "LT" suffix per Maxim's Reset Voltage Threshold Suffix Guide and do not require external resistor programming.
Does MAX6722UTLTD3+ support watchdog functionality, and what are its timing modes?
Yes, MAX6722UTLTD3+ includes a dual-mode watchdog timer: a 35s minimum startup timeout after any reset event (power-on, MR, or prior watchdog timeout), followed by a 1.12s minimum normal timeout triggered by WDI edge transitions. This architecture supports lengthy boot sequences while maintaining tight runtime fault detection.
What is the reset output type and drive strength of MAX6722UTLTD3+?
MAX6722UTLTD3+ features a push-pull active-low RST output referenced to VCC1. It sources ≥0.8×VCC1 at 500µA and sinks ≤0.4V at 3.2mA, eliminating the need for an external pullup resistor and enabling direct connection to most microprocessor reset inputs.
Can MAX6722UTLTD3+ monitor a third voltage rail?
No, MAX6722UTLTD3+ is a dual-voltage supervisor (VCC1 and VCC2 only). The "22" in the part number indicates it belongs to the MAX6721–MAX6722 dual-monitor subgroup without RSTIN or PFI inputs. For triple-voltage monitoring, consider MAX6723UTLTD3+ or MAX6724UTLTD3+.
What package and environmental rating does MAX6722UTLTD3+ use?
MAX6722UTLTD3+ is supplied in a RoHS-compliant, lead-free 6-pin SOT23-6 package (2.9mm × 1.6mm × 1.1mm) and is specified for operation from -40°C to +85°C. The "+" suffix confirms lead-free packaging per Maxim's ordering conventions.
MAX6722UTLTD3+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- -
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- -
- Number of Voltages Monitored:
- -
- Voltage - Threshold:
- -
- Output:
- -
- Reset:
- -
- Reset Timeout:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
MAX6722UTLTD3+ FAQ
1.How can I place an order for MAX6722UTLTD3+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6722UTLTD3+ 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 MAX6722UTLTD3+ reliable?
The price and inventory of MAX6722UTLTD3+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6722UTLTD3+ is usually 5 days.
3.What payment methods are accepted for MAX6722UTLTD3+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6722UTLTD3+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6722UTLTD3+?
MAX6722UTLTD3+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6722UTLTD3+ 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 MAX6722UTLTD3+?
For technical support, including MAX6722UTLTD3+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6722UTLTD3+ requirements.
6.How does Aetrix verify that MAX6722UTLTD3+ is sourced from the original manufacturer or authorized distributors?
All MAX6722UTLTD3+ 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 MAX6722UTLTD3+ meets industry standards.
7.What is the process for return or replacement of MAX6722UTLTD3+?
All MAX6722UTLTD3+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6722UTLTD3+, 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 MAX6722UTLTD3+ part is unused and in its original packaging.
Return procedure for MAX6722UTLTD3+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX6722UTLTD3+ Tags
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