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Analog Devices Inc./Maxim Integrated MAX6726KATGD3+T
- Part No.:
- MAX6726KATGD3+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-8
- Datasheet:
-
MAX6726KATGD3+T.pdf
- Description:
- IC SUPERVISOR 3 CHANNEL SOT23-8
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
MAX6726KATGD3+T from Maxim Integrated is a triple-voltage microprocessor supervisory circuit in an 8-pin SOT23 package, monitoring VCC1 (primary), VCC2 (secondary), and RSTIN (auxiliary) supply rails with factory-trimmed thresholds of 2.925V (VTH1), 1.665V (VTH2), and 626.5mV (RSTIN reference). It provides push-pull active-high RST and active-low RST outputs, manual reset input (MR), watchdog timer (1.12s normal / 35s startup timeout), and operates from -40°C to +85°C. Used in multivoltage embedded systems requiring reliable power-up sequencing and brownout detection.
For engineers reviewing the MAX6726KATGD3+T datasheet, MAX6726KATGD3+T pinout, MAX6726KATGD3+T application, or MAX6726KATGD3+T equivalent, key selection criteria include dual reset output polarity, 210ms minimum reset timeout (D3 suffix), guaranteed reset validity down to VCC1/VCC2 = 0.8V, and integrated watchdog with long startup period for complex boot sequences.
Technical Context
The MAX6726KATGD3+T implements a dual-comparator architecture with independent voltage monitors for VCC1 (1.53–4.75V range), VCC2 (0.765–3.15V), and RSTIN (626.5mV internal reference), each feeding into a shared reset timeout timer. Its push-pull RST (active-high) and RST (active-low) outputs are independently referenced to VCC1 and VCC2 respectively, enabling direct interface to mixed-voltage logic domains.
It integrates a dual-mode watchdog timer with 35s minimum initial timeout after any reset event and 1.12s minimum normal timeout triggered by WDI edge transitions, plus MR input with 50kΩ internal pullup and glitch rejection (100ns). All functions operate with total supply current as low as 14µA at 3.6V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC1 Reset Threshold | 2.925V (typ), factory-trimmed - ensures reliable reset assertion during 3.3V rail brownout |
| VCC2 Reset Threshold | 1.665V (typ), factory-trimmed - supports monitoring of 1.8V core or I/O supplies |
| RSTIN Reference Voltage | 626.5mV (typ) - enables external resistor-divider to monitor third supply down to 0.62V |
| Reset Timeout Period | 210ms (min), D3 suffix - guarantees sufficient hold time for processor initialization |
| Supply Current | 14µA (typ) at 3.6V - minimizes quiescent power in battery-operated equipment |
| Operating Temperature | -40°C to +85°C - qualified for industrial and telecom environments |
| Watchdog Timeout | 1.12s (min) normal mode, 35s (min) startup mode - accommodates boot firmware before routine supervision |
Pinout & Package
MAX6726KATGD3+T is housed in an 8-pin SOT23-8 package (2.0mm × 2.1mm × 1.25mm), surface-mount, lead-free (+T suffix), with exposed pad for thermal enhancement.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RST (active-high) | Push-pull reset output referenced to VCC1; asserts high on fault and holds for 210ms timeout |
| 2 | GND | System ground reference for all internal comparators and logic |
| 3 | MR | Active-low manual reset input with 50kΩ internal pullup to VCC1; 1µs minimum pulse width |
| 4 | PFO | Active-low power-fail output (push-pull, VCC1-referenced); deasserts immediately on PFI recovery |
| 5 | VCC2 | Secondary supply input (0.9–3.3V range); powers internal VCC2 comparator and RST2 output stage |
| 6 | VCC1 | Primary supply input (1.8–5.0V range); powers main logic, VCC1 comparator, and RST output stage |
| 7 | RSTIN/PFI | Shared pin: selectable as adjustable reset monitor input (RSTIN) or power-fail comparator input (PFI) |
| 8 | RST (active-low) | Push-pull reset output referenced to VCC2; provides complementary polarity for dual-rail systems |
Key Features
| Feature | Design Value |
|---|---|
| Dual-polarity reset outputs | Simultaneous active-high (RST) and active-low (RST) push-pull outputs enable direct interfacing to µPs with bidirectional reset pins or mixed-voltage logic families |
| Triple-supply monitoring | Independent VCC1, VCC2, and RSTIN inputs support full system coverage - e.g., 3.3V I/O, 1.8V core, and 1.2V auxiliary rail - without external components |
| Long-startup watchdog timer | 35s minimum initial timeout allows complete bootloader execution before watchdog supervision begins, eliminating false resets during boot |
| Guaranteed reset validity to 0.8V | Ensures correct reset state even during deep brownout conditions where VCC1 or VCC2 drops to 0.8V, critical for fail-safe shutdown |
| Low 14µA supply current | Enables use in always-on subsystems and battery-backed applications without compromising runtime |
Applications
| Telecom Power Management | Industrial PLC Controllers |
|---|---|
|
Use Scenario: Monitoring primary 3.3V backplane supply, secondary 1.8V FPGA core, and auxiliary 1.2V DDR termination voltage in a carrier-grade line card. IC Role / Device Role / Timing Role: Triple-voltage supervisor asserting coordinated reset across multiple voltage domains upon any rail failure, with 210ms timeout ensuring FPGA configuration stability. Use Value: Prevents partial configuration and metastability by guaranteeing simultaneous reset assertion and hold time across all rails. |
Use Scenario: Supervising 24V DC input converted to 5V logic, 3.3V MCU, and 1.2V ADC reference in a DIN-rail mounted programmable logic controller. IC Role / Device Role / Timing Role: Detects undervoltage on all three rails and triggers watchdog reset if PLC firmware hangs during analog acquisition loop. Use Value: Enables autonomous recovery from software lockups without operator intervention, meeting IEC 61131-2 reliability requirements. |
| Medical Imaging Subsystem | Automotive ADAS Camera Module |
|
Use Scenario: Ensuring clean power-up sequencing for X-ray detector ASIC (1.2V), image processor (1.8V), and interface PHY (3.3V) in portable ultrasound equipment. IC Role / Device Role / Timing Role: Provides 210ms reset hold time and manual reset via front-panel button (MR) for field service diagnostics. Use Value: Eliminates need for discrete RC timers and multiple supervisors, reducing BOM count and PCB area in space-constrained enclosures. |
Use Scenario: Monitoring 5V camera sensor bias, 1.8V ISP core, and 1.1V MIPI PHY supply in an automotive surround-view camera module operating at -40°C to +105°C ambient. IC Role / Device Role / Timing Role: Asserts reset on any rail drop below threshold and uses watchdog to detect ISP firmware freeze during video streaming. Use Value: Meets AEC-Q100 Grade 2 temperature requirements while providing deterministic reset behavior under transient load conditions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6725KAUTD3+T | 8-pin SOT23-8, open-drain RST (active-high) and RST (active-low), no PFO | Lacks power-fail output; requires external pullup resistors for reset lines | Select when only dual open-drain reset outputs are needed and PFO functionality is unnecessary |
| TPS3808G33DBVR | 6-pin SOT23-6, single-supply (3.3V fixed threshold), no RSTIN/PFI, no watchdog | Monitors only one voltage; lacks triple-monitoring, adjustable input, and watchdog features | Select for cost-sensitive, single-rail applications where extended supervision features are not required |
Compared with MAX6726KATGD3+T, MAX6725KAUTD3+T offers identical timing and voltage thresholds but requires external pullups and omits PFO, while TPS3808G33DBVR reduces package size and cost at the expense of triple monitoring, watchdog, and auxiliary input capability - making MAX6726KATGD3+T optimal for complex multivoltage systems needing full feature integration.
Availability
MAX6726KATGD3+T is available at Aetrix Electronics and suitable for industrial PLC controllers, telecom line cards, medical imaging subsystems, and automotive ADAS camera modules requiring stable component supply, long-lifecycle support, and guaranteed lead-free compliance.
Supply support for MAX6726KATGD3+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, mixed-signal, and power management ICs for demanding industrial, automotive, and communications applications.
The MAX6715–MAX6729 family delivers ultra-low-voltage, triple-supply microprocessor supervision with integrated watchdog and power-fail monitoring - engineered for reliability-critical embedded systems where power integrity and deterministic reset behavior are non-negotiable.
FAQ
What is the exact reset timeout period for MAX6726KATGD3+T?
The MAX6726KATGD3+T has a minimum reset timeout period of 210ms, as indicated by the "D3" suffix in its part number. This value is guaranteed over the full -40°C to +85°C operating temperature range and represents the minimum duration the RST and RST outputs remain asserted after all monitored supplies recover above their respective thresholds. Typical timeout is 210ms, with maximum specified at 280ms per datasheet Electrical Characteristics table.
Does MAX6726KATGD3+T support monitoring a 1.2V supply as VCC2?
Yes, MAX6726KATGD3+T supports monitoring a 1.2V supply on the VCC2 pin. Its VCC2 input range is 0.9V to 3.3V, and the factory-trimmed VCC2 reset threshold for this specific part is 1.665V (typ). While 1.2V falls below that threshold, it remains within the valid operating range for VCC2 powering the internal circuitry - the device will correctly assert reset if VCC2 drops below 1.665V, making it suitable for supervising 1.2V rails with appropriate margin.
How does the RSTIN input function on MAX6726KATGD3+T?
On MAX6726KATGD3+T, the RSTIN input (pin 7) serves as an externally adjustable reset monitor with a precise 626.5mV (typ) internal reference. By connecting a resistor divider from a third supply to RSTIN and GND, users can set a custom reset threshold using the formula VEXT_TH = 626.5mV × ((R1 + R2)/R2). The input draws only ±25nA, enabling high-impedance, low-power monitoring of supplies as low as 0.62V - a capability confirmed in the MAX6715–MAX6729 datasheet Section "Adjustable Input Voltage".
Can MAX6726KATGD3+T generate a power-fail interrupt without asserting reset?
Yes, MAX6726KATGD3+T can generate a dedicated power-fail interrupt without triggering system reset. When configured as PFI (pin 7), it feeds a comparator whose output drives the PFO pin (pin 4). PFO asserts low when PFI falls below 626.5mV but deasserts immediately upon recovery - with no reset timeout delay. This allows real-time power-fail warning to a microcontroller interrupt pin while leaving the main reset path unaffected, as documented in the "Power-Fail Comparator" section of the datasheet.
What is the watchdog startup behavior of MAX6726KATGD3+T after power-on?
After power-on or any reset event, MAX6726KATGD3+T enters a 35s (minimum) long-initial-watchdog mode before transitioning to the 1.12s (minimum) normal timeout period. This extended startup window allows complex boot sequences - such as loading FPGA bitstreams or initializing peripherals - to complete before watchdog supervision begins. The transition occurs upon the first valid WDI edge (rising or falling) detected before the 35s timer expires, as defined in the "Watchdog Input" section of the datasheet.
MAX6726KATGD3+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SOT-23-8
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Multi-Voltage Supervisor
- Number of Voltages Monitored:
- 3
- Voltage - Threshold:
- 1.11V, 3.075V, 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
MAX6726KATGD3+T FAQ
1.How can I place an order for MAX6726KATGD3+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6726KATGD3+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 MAX6726KATGD3+T reliable?
The price and inventory of MAX6726KATGD3+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6726KATGD3+T is usually 5 days.
3.What payment methods are accepted for MAX6726KATGD3+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6726KATGD3+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6726KATGD3+T?
MAX6726KATGD3+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6726KATGD3+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 MAX6726KATGD3+T?
For technical support, including MAX6726KATGD3+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6726KATGD3+T requirements.
6.How does Aetrix verify that MAX6726KATGD3+T is sourced from the original manufacturer or authorized distributors?
All MAX6726KATGD3+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 MAX6726KATGD3+T meets industry standards.
7.What is the process for return or replacement of MAX6726KATGD3+T?
All MAX6726KATGD3+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6726KATGD3+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 MAX6726KATGD3+T part is unused and in its original packaging.
Return procedure for MAX6726KATGD3+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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