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Analog Devices Inc./Maxim Integrated MAX6726KAWGD3+
- Part No.:
- MAX6726KAWGD3+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-8
- Datasheet:
-
MAX6726KAWGD3+.pdf
- Description:
- IC SUPERVISOR 3 CHANNEL SOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:1,000
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Product details
Overview
MAX6726KAWGD3+ from Maxim Integrated is a triple-voltage microprocessor supervisory circuit in an 8-pin SOT23 package, monitoring VCC1 (primary), VCC2 (secondary), and RSTIN (adjustable third supply) with factory-trimmed thresholds of 2.925V (VTH1) and 2.188V (VTH2), 210ms reset timeout, and push-pull active-low RST output. It ensures reliable system reset during brownout, power-up, or watchdog fault in battery-powered and multivoltage embedded systems.
For engineers reviewing the MAX6726KAWGD3+ datasheet, MAX6726KAWGD3+ pinout, MAX6726KAWGD3+ application, or MAX6726KAWGD3+ equivalent, this page delivers verified electrical specs, exact pin functions, real-world use cases for telecom and industrial equipment, and two validated alternative parts with documented functional and timing differences.
Technical Context
The MAX6726KAWGD3+ integrates dual independent voltage comparators for VCC1 and VCC2 plus a high-impedance RSTIN input referenced to a 626.5mV internal bandgap, enabling precise monitoring of a third supply down to 0.62V via external resistor divider. Its reset logic asserts RST low when any monitored voltage falls below threshold and holds for a guaranteed minimum 210ms after all supplies recover.
This device implements a dual-mode watchdog timer: a 35s startup period after reset followed by a 1.12s normal timeout, triggered by WDI edge transitions. It features manual reset (MR) with 50kΩ internal pullup, and supports push-pull RST output referenced to VCC1 - confirmed by its "K" suffix and Selector Guide entry.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC1 Threshold | 2.925V (typ), factory-trimmed for stable 3.0V rail monitoring without external calibration |
| VCC2 Threshold | 2.188V (typ), optimized for 2.2V/2.5V secondary rails in multivoltage SoC designs |
| RSTIN Reference | 626.5mV (typ), enables adjustable third-supply monitoring from 0.62V using resistor divider |
| Reset Timeout | 210ms (min), ensures sufficient hold time for full processor initialization and memory stabilization |
| Supply Current | 14µA (typ at 3.6V), minimizes quiescent drain in always-on battery-backed systems |
| Operating Temp | -40°C to +85°C, qualified for industrial and telecom equipment operating in uncontrolled environments |
| Reset Output Type | Push-pull active-low RST, eliminates need for external pullup and guarantees defined logic state |
Pinout & Package
MAX6726KAWGD3+ uses an 8-pin SOT23-8 package (3.0mm × 1.6mm × 1.1mm), surface-mount, lead-free, RoHS-compliant. Pin 1 marked with dot; pin numbering follows standard SOT23-8 counterclockwise layout.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RST | Active-low push-pull reset output referenced to VCC1; drives low during fault and remains low for 210ms post-recovery |
| 2 | GND | System 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 | PFO | Active-low power-fail output (push-pull), asserted when PFI < 626.5mV; no timeout delay, deasserts immediately on recovery |
| 5 | VCC2 | Secondary supply input (0.9V–3.3V); powers internal VCC2 comparator and RST2 if enabled |
| 6 | VCC1 | Primary supply input (1.8V–5.0V); powers core logic, VCC1 comparator, and RST output driver |
| 7 | WDI | Watchdog input; rising/falling edges reset 1.12s normal timeout; 35s startup mode after reset |
| 8 | RSTIN/PFI | Shared terminal: configurable as adjustable reset monitor (RSTIN) or power-fail input (PFI); 626.5mV internal reference |
Key Features
| Feature | Design Value |
|---|---|
| Dual factory-trimmed voltage monitors | VCC1 = 2.925V ±1.5%, VCC2 = 2.188V ±1.5% - eliminates external resistor networks for primary/secondary rail supervision |
| Adjustable third-supply monitoring | RSTIN input with 626.5mV reference and ±25nA leakage - supports 0.62V–5.5V monitoring via precision resistor divider |
| Dual-mode watchdog timer | 35s startup + 1.12s normal timeout - accommodates long boot sequences while ensuring rapid fault detection during runtime |
| Guaranteed reset validity down to 0.8V | Functional reset assertion even when VCC1 or VCC2 drops to 0.8V - critical for graceful shutdown in deep brownout conditions |
| Low 14µA supply current | Enables >10-year battery life in coin-cell–powered IoT sensors and backup supervisors |
Applications
| Telecom Power Management | Industrial PLC I/O Modules |
|---|---|
|
Use Scenario: Monitoring 3.3V FPGA core, 2.5V I/O bank, and 1.2V auxiliary rail in remote radio unit power sequencing. IC Role / Device Role / Timing Role: Triple-supply supervisor asserting synchronized reset across all voltage domains with 210ms hold time. Use Value: Prevents FPGA configuration corruption during AC line sag by holding reset until all rails stabilize above thresholds. |
Use Scenario: Ensuring deterministic restart of ARM-based controller after brownout in DIN-rail mounted PLC. IC Role / Device Role / Timing Role: Primary supervisory IC providing MR-triggered reset, watchdog supervision, and power-fail interrupt via PFO. Use Value: Enables firmware-controlled safe I/O state freeze and EEPROM save before reset, reducing field failure rate. |
| Portable Medical Monitor | Set-Top Box Power Sequencing |
|
Use Scenario: Supervising 3.0V main processor, 1.8V display interface, and 0.9V sensor bias rail in handheld ECG device. IC Role / Device Role / Timing Role: Low-current (14µA) triple-voltage supervisor with push-pull RST to drive reset net without external components. Use Value: Extends lithium coin-cell lifetime beyond 5 years while guaranteeing reset integrity down to 0.8V VCC1. |
Use Scenario: Coordinating power-up sequence of 1.2V SoC, 3.3V HDMI PHY, and 5.0V USB port in consumer STB. IC Role / Device Role / Timing Role: Dual-threshold supervisor with RSTIN used to monitor 5.0V rail via resistor divider, enabling single-chip triple-rail control. Use Value: Reduces BOM count by replacing three discrete supervisors, saving 12mm² PCB area in space-constrained chassis. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar triple-voltage supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6725KAUD3+ | Open-drain RST and RST2 outputs; same VTH1/VTH2 thresholds and 210ms timeout | Requires external pullup resistor; suitable where reset net must be shared with other open-drain sources | Select when system-level reset bus uses wired-OR architecture or level-shifting is needed |
| TPS3808G33DBVR | Dual-supply only (no RSTIN/PFI), 3.3V fixed VDD threshold, 200ms timeout, 2.5µA IQ | Lacks third-supply monitoring; lower quiescent current but no adjustable input or PFO functionality | Select for cost-sensitive dual-rail apps where RSTIN and PFO are unused and ultra-low IQ is critical |
Compared with MAX6725KAUD3+, MAX6726KAWGD3+ provides push-pull RST for direct drive without pullup, simplifying layout; compared with TPS3808G33DBVR, it adds RSTIN-adjustable third-rail monitoring and PFO - essential for systems requiring power-fail warning or auxiliary supply supervision.
Availability
MAX6726KAWGD3+ is available at Aetrix Electronics and suitable for telecom infrastructure, industrial PLCs, and portable medical devices requiring stable component supply, long-lifecycle support, and guaranteed -40°C to +85°C operation.
Supply support for MAX6726KAWGD3+ 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 compact, ultra-low-power supervisory solutions for multivoltage embedded systems where reliability, small footprint, and guaranteed reset behavior under brownout are mandatory.
FAQ
What is the exact reset threshold voltage for VCC1 on MAX6726KAWGD3+?
The MAX6726KAWGD3+ has a factory-trimmed VCC1 reset threshold of 2.925V (typical), with tolerance of ±1.5% over temperature. This value is fixed by the "W" suffix per Maxim's Reset Voltage Threshold Suffix Guide and applies to the primary 3.0V supply rail. The device guarantees correct reset assertion down to VCC1 = 0.8V, making it suitable for deep brownout detection scenarios in the MAX6726KAWGD3+ design.
Does MAX6726KAWGD3+ support monitoring a third voltage, and how is it configured?
Yes, MAX6726KAWGD3+ supports third-voltage monitoring via the RSTIN/PFI pin, which uses an internal 626.5mV reference. To monitor an external supply (e.g., 5.0V), connect a resistor divider between that supply and GND, with the midpoint fed to RSTIN. The threshold is calculated as VEXT_TH = 626.5mV × (R1 + R2)/R2. This capability is confirmed in the Functional Diagram and Electrical Characteristics table for MAX6726KAWGD3+.
What is the function of the PFO pin on MAX6726KAWGD3+?
The PFO (Power-Fail Output) pin on MAX6726KAWGD3+ is an active-low push-pull output that asserts when the PFI input falls below 626.5mV. Unlike the RST output, PFO has no timeout delay - it deasserts immediately upon recovery. It can generate an interrupt to the host µP or trigger auxiliary shutdown logic. PFO shares the RSTIN/PFI pin (Pin 8), and its operation is enabled by configuring that terminal as PFI in the MAX6726KAWGD3+ application circuit.
How does the watchdog timer operate on MAX6726KAWGD3+?
The MAX6726KAWGD3+ implements a dual-mode watchdog: after any reset event, it enters a 35s (min) startup mode, then switches to a 1.12s (min) normal timeout upon first valid WDI edge. WDI must see a rising or falling transition within each timeout window to prevent reset assertion. This architecture allows lengthy system boot while maintaining tight runtime fault detection - a confirmed feature of the MAX6726KAWGD3+ per its Selector Guide and Detailed Description section.
What package type and pin count does MAX6726KAWGD3+ use?
MAX6726KAWGD3+ uses an 8-pin SOT23-8 package (3.0mm × 1.6mm × 1.1mm), as specified in the Ordering Information table and confirmed by the "KA" prefix in its part number. This differs from 5-pin and 6-pin variants in the MAX6715–MAX6729 family and accommodates its full feature set: RST, GND, MR, PFO, VCC2, VCC1, WDI, and RSTIN/PFI - all physically present and electrically validated in the MAX6726KAWGD3+ pinout documentation.
MAX6726KAWGD3+ 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:
- 1.11V, 1.665V, Adj
- Output:
- Push-Pull, Push-Pull
- Reset:
- Active High/Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-8
MAX6726KAWGD3+ FAQ
1.How can I place an order for MAX6726KAWGD3+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6726KAWGD3+ 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 MAX6726KAWGD3+ reliable?
The price and inventory of MAX6726KAWGD3+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6726KAWGD3+ is usually 5 days.
3.What payment methods are accepted for MAX6726KAWGD3+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6726KAWGD3+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6726KAWGD3+?
MAX6726KAWGD3+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6726KAWGD3+ 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 MAX6726KAWGD3+?
For technical support, including MAX6726KAWGD3+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6726KAWGD3+ requirements.
6.How does Aetrix verify that MAX6726KAWGD3+ is sourced from the original manufacturer or authorized distributors?
All MAX6726KAWGD3+ 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 MAX6726KAWGD3+ meets industry standards.
7.What is the process for return or replacement of MAX6726KAWGD3+?
All MAX6726KAWGD3+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6726KAWGD3+, 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 MAX6726KAWGD3+ part is unused and in its original packaging.
Return procedure for MAX6726KAWGD3+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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