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Analog Devices Inc./Maxim Integrated MAX6726AKAZWD3+T
- Part No.:
- MAX6726AKAZWD3+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-8
- Datasheet:
-
MAX6726AKAZWD3+T.pdf
- Description:
- IC SUPERVISOR 3 CHANNEL SOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:5,000
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Product details
Overview
MAX6726AKAZWD3+T from Maxim Integrated is a dual-supply ultra-low-voltage microprocessor supervisory circuit with factory-trimmed reset thresholds (VCC1 = 1.62V, VCC2 = 1.53V), 280ms minimum reset timeout, push-pull active-low RST output, and integrated watchdog timer (35s startup / 1.12s normal mode). It monitors primary and secondary power rails in battery-powered embedded systems requiring guaranteed reset validity down to VCC = 0.8V.
For engineers reviewing the MAX6726AKAZWD3+T datasheet, MAX6726AKAZWD3+T pinout, MAX6726AKAZWD3+T application, or MAX6726AKAZWD3+T equivalent, key selection considerations include its dual-voltage monitoring capability, AEC-Q100-qualified variants in the family, watchdog disable via floating WDI, and compatibility with 1.2V–5.5V supply ranges across automotive, industrial, and portable equipment designs.
Technical Context
The MAX6726AKAZWD3+T implements independent voltage comparators for VCC1 and VCC2 with ±1.5% threshold accuracy and 20ppm/°C tempco, ensuring stable reset assertion during thermal cycling. Its internal reset timeout timer guarantees ≥280ms assertion after all monitored supplies recover above threshold.
This device integrates a dual-mode watchdog timer with 35s minimum startup period (for boot sequence accommodation) and 1.12s minimum normal-mode timeout (for runtime fault detection), triggered by WDI edge transitions. Reset logic remains valid even when either VCC1 or VCC2 drops to 0.8V, enabling robust brownout handling in low-power systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC1 Reset Threshold | 1.62V (min), 1.665V (typ), 1.710V (max) - factory-trimmed for reliable 1.8V rail supervision with hysteresis |
| VCC2 Reset Threshold | 1.530V (min), 1.575V (typ), 1.620V (max) - optimized for 1.6V/1.5V secondary rails in multivoltage SoCs |
| Reset Timeout Period | 280ms (min), 420ms (typ), 560ms (max) - ensures sufficient hold time for processor initialization sequences |
| Supply Current | 10µA (typ) at 3.6V - enables multi-year operation in coin-cell–powered IoT endpoints |
| Watchdog Timeout | 35s (min) startup, 1.12s (min) normal mode - supports complex boot firmware while detecting runtime hangs |
| Operating Temperature | -40°C to +125°C - qualified for under-hood automotive and industrial control environments |
| Reset Output Type | Push-pull active-low RST - eliminates need for external pullup resistor in most MCU interface configurations |
Pinout & Package
MAX6726AKAZWD3+T is housed in an 8-pin SOT23 package (package code K8SN+1, outline 21-0078), with 0.65mm pitch, 2.9mm × 1.6mm footprint, and thermal resistance θJA = 180°C/W on multilayer board.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RST/RST1 | Active-low push-pull reset output referenced to VCC1; asserts when VCC1/VCC2 fall 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 internal 50kΩ pullup to VCC1; debounced by 1µs minimum pulse width requirement |
| 4 | VCC2 | Secondary supply input powering comparator for VCC2 threshold detection and RST2 output (if present) |
| 5 | VCC1 | Primary supply input powering core logic, VCC1 comparator, and RST output driver |
| 6 | WDI | Watchdog input; unconnected state disables watchdog; rising/falling edges reset internal timer |
| 7 | PFO | Active-low power-fail output (push-pull), asserted when PFI < 626.5mV; deasserts immediately without timeout |
| 8 | PFI | Power-fail monitor input with 626.5mV internal reference; used to detect auxiliary supply droop or battery depletion |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent voltage monitoring | Simultaneous supervision of VCC1 (1.62V threshold) and VCC2 (1.53V threshold) with separate comparators and hysteresis |
| Guaranteed reset validity down to 0.8V | Ensures deterministic reset behavior during deep brownout conditions common in Li-ion battery discharge profiles |
| Configurable watchdog timer | Long 35s startup window accommodates full system boot; short 1.12s runtime timeout detects software lockups |
| Low quiescent current | 10µA typical at 3.6V enables >10-year shelf life in always-on sensor nodes powered by CR2032 cells |
| Power-fail interrupt generation | PFI/PFO pair provides early warning of supply collapse, allowing controlled data save and graceful shutdown before reset |
Applications
| Industrial PLC I/O Modules | Automotive Body Control Units |
|---|---|
|
Use Scenario: Monitoring 3.3V MCU core supply and 5V CAN transceiver supply in distributed I/O nodes exposed to wide temperature swings and EMI. IC Role / Device Role / Timing Role: Dual-supply supervisor asserting synchronized reset across both domains upon any rail failure, with 280ms timeout ensuring safe state capture. Use Value: Prevents partial initialization and metastability in mixed-voltage subsystems during cold cranking or load dump events. |
Use Scenario: Supervising 1.2V domain controller supply and 1.5V sensor interface rail in body electronics modules operating from 12V battery with wide voltage range. IC Role / Device Role / Timing Role: Provides AEC-Q100-aligned reset coordination between safety-critical MCU and peripheral ICs during battery voltage sag. Use Value: Enables compliance with ISO 16750-2 transient immunity requirements through guaranteed 0.8V reset validity and glitch immunity. |
| Portable Medical Monitors | 5G Small Cell Baseband Units |
|
Use Scenario: Power sequencing and brownout protection for ARM Cortex-M based vital sign analyzers powered by single-cell Li-ion batteries. IC Role / Device Role / Timing Role: Monitors main 3.3V system rail and 1.8V display interface rail; uses WDI to detect firmware hang during ECG waveform processing. Use Value: Extends battery life via 10µA quiescent current while maintaining fail-safe restart capability during critical patient monitoring intervals. |
Use Scenario: Ensuring reliable boot and runtime supervision of FPGA configuration supply (1.2V) and RF front-end bias rails (3.3V) in thermally constrained small cell enclosures. IC Role / Device Role / Timing Role: Dual-rail monitoring with PFI used to track backup supercapacitor voltage, triggering PFO interrupt for graceful shutdown prior to complete power loss. Use Value: Eliminates need for discrete supervisors and external timing components, reducing BOM count and PCB area in space-constrained radio units. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-supply supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6725AKAZD3+T | Same pinout and package; open-drain RST output instead of push-pull; identical reset thresholds and timeout | Requires external pullup resistor; better suited for bidirectional reset buses or level-shifting interfaces | Select when interfacing to μPs with bidirectional reset pins or when driving multiple loads sharing one reset line |
| TPS3808G33DBVR | Single-supply (3.3V only); no VCC2 monitoring; 200ms timeout; lower 4.5µA ICC | Lacks dual-rail capability; no PFI/PFO or WDI functionality; not rated for 125°C operation | Choose for cost-sensitive, single-rail applications where extended temperature range and auxiliary monitoring are unnecessary |
Compared with MAX6725AKAZD3+T and TPS3808G33DBVR, the MAX6726AKAZWD3+T uniquely delivers push-pull reset drive, dual independent supply monitoring, and integrated watchdog/power-fail functions in a single 8-pin SOT23-reducing component count and improving system-level reliability in multivoltage embedded designs.
Availability
MAX6726AKAZWD3+T is available at Aetrix Electronics and suitable for industrial automation, automotive electronics, and portable medical devices requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6726AKAZWD3+T 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, with emphasis on power efficiency and reliability.
The MAX6715A–MAX6729A family delivers ultra-low-voltage supervisory circuits targeting multivoltage systems where simultaneous monitoring of core and I/O rails is essential for functional safety and power integrity.
FAQ
What is the exact reset threshold voltage for VCC1 on MAX6726AKAZWD3+T?
The MAX6726AKAZWD3+T has a factory-trimmed VCC1 reset threshold of 1.62V (min), 1.665V (typ), and 1.710V (max), corresponding to the 'W' suffix in the ordering guide. This threshold is optimized for reliable supervision of 1.8V logic rails with margin against noise and drift across -40°C to +125°C.
Does MAX6726AKAZWD3+T support monitoring a third voltage rail?
No, MAX6726AKAZWD3+T is a dual-supply supervisor monitoring only VCC1 and VCC2. For triple-voltage monitoring, select variants like MAX6723AKAZD3+T or MAX6727AKAZD3+T that include the RSTIN input. The MAX6726AKAZWD3+T does not incorporate RSTIN or associated comparator circuitry.
How is the watchdog timer disabled on MAX6726AKAZWD3+T?
The watchdog timer on MAX6726AKAZWD3+T is disabled by leaving the WDI pin unconnected. An internal 200nA current source detects the floating state and inhibits watchdog operation. Do not connect WDI to any node sourcing >50nA, as this may falsely enable the timer.
What is the function of the PFI and PFO pins on MAX6726AKAZWD3+T?
On MAX6726AKAZWD3+T, PFI serves as a high-impedance input for monitoring an auxiliary supply using an external resistor divider referenced to a 626.5mV internal comparator threshold. PFO is the corresponding active-low push-pull output that asserts immediately when PFI falls below threshold-without reset timeout-enabling early power-fail interrupts.
Is MAX6726AKAZWD3+T qualified for automotive applications?
While MAX6726AKAZWD3+T itself is not AEC-Q100 certified, it belongs to the MAX6715A–MAX6729A family where specific variants (e.g., MAX6719AUTTWD1/V+T) carry AEC-Q100 qualification. The MAX6726AKAZWD3+T shares identical architecture, process, and temperature rating (-40°C to +125°C), making it suitable for non-safety-critical automotive subsystems pending customer qualification.
MAX6726AKAZWD3+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SOT-23-8
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Multi-Voltage Supervisor
- Number of Voltages Monitored:
- 3
- Voltage - Threshold:
- 1.665V, 2.313V, Adj
- Output:
- Push-Pull, Push-Pull
- Reset:
- Active High/Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-8
MAX6726AKAZWD3+T FAQ
1.How can I place an order for MAX6726AKAZWD3+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6726AKAZWD3+T 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 MAX6726AKAZWD3+T reliable?
The price and inventory of MAX6726AKAZWD3+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6726AKAZWD3+T is usually 5 days.
3.What payment methods are accepted for MAX6726AKAZWD3+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6726AKAZWD3+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6726AKAZWD3+T?
MAX6726AKAZWD3+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6726AKAZWD3+T 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 MAX6726AKAZWD3+T?
For technical support, including MAX6726AKAZWD3+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6726AKAZWD3+T requirements.
6.How does Aetrix verify that MAX6726AKAZWD3+T is sourced from the original manufacturer or authorized distributors?
All MAX6726AKAZWD3+T 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 MAX6726AKAZWD3+T meets industry standards.
7.What is the process for return or replacement of MAX6726AKAZWD3+T?
All MAX6726AKAZWD3+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6726AKAZWD3+T, 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 MAX6726AKAZWD3+T part is unused and in its original packaging.
Return procedure for MAX6726AKAZWD3+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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