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Analog Devices Inc./Maxim Integrated MAX6726KAYDD3+T
- Part No.:
- MAX6726KAYDD3+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-8
- Datasheet:
-
MAX6726KAYDD3+T.pdf
- Description:
- IC SUPERVISOR 3 CHANNEL SOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:2,500
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Product details
Overview
MAX6726KAYDD3+T from Maxim Integrated is a triple-voltage microprocessor supervisory circuit in an 8-pin SOT23 package, monitoring VCC1 (4.625V threshold), VCC2 (3.075V threshold), and RSTIN (adjustable down to 0.626V) with 210ms reset timeout, push-pull RST output, manual reset input, and watchdog timer - used in multivoltage embedded systems requiring reliable power-up sequencing and brownout protection.
For engineers reviewing the MAX6726KAYDD3+T datasheet, MAX6726KAYDD3+T pinout, MAX6726KAYDD3+T application, or MAX6726KAYDD3+T equivalent, this page delivers verified specifications, exact pin functions, real-world use cases in telecom and industrial equipment, and two validated alternative parts with documented functional and timing differences.
Technical Context
The MAX6726KAYDD3+T implements dual independent voltage comparators for VCC1 and VCC2 plus a high-impedance RSTIN comparator referenced to a 626mV internal bandgap, enabling precise third-supply monitoring via external resistor divider. Its reset logic asserts active-low RST when any monitored supply falls below its threshold and holds for a guaranteed 210ms minimum after recovery.
It integrates a dual-mode watchdog timer: 35s startup period after reset, then 1.12s normal timeout, triggered by missing WDI edges; includes MR with 50kΩ internal pullup and glitch rejection; and supports push-pull RST output referenced to VCC1, ensuring valid reset state down to VCC1 = 0.8V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC1 Threshold | 4.625V (factory-trimmed, ±1.5% over -40°C to +85°C) |
| VCC2 Threshold | 3.075V (factory-trimmed, ±1.5% over -40°C to +85°C) |
| RSTIN Reference | 626mV internal reference (enables adjustable monitoring of supplies ≥0.62V) |
| Reset Timeout | 210ms min (D3 suffix; ensures sufficient hold time for processor initialization) |
| Supply Current | 14µA typ at 3.6V (ultra-low quiescent current enables battery-backed operation) |
| Watchdog Period | 35s min startup / 1.12s min normal mode (supports complex boot sequences and runtime fault detection) |
| Operating Temp | -40°C to +85°C (industrial-grade thermal range for embedded deployment) |
Pinout & Package
Package: 8-pin SOT23-8 (2.0mm × 2.1mm × 1.25mm, 0.65mm pitch), lead-free, RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RST | Active-low push-pull reset output referenced to VCC1; drives high to ≥0.8×VCC1 when deasserted |
| 2 | GND | System ground reference for all 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); asserts when PFI < 626mV, no timeout delay |
| 5 | VCC2 | Secondary supply input (0.9V–3.3V); powers internal VCC2 comparator and RST2 if present |
| 6 | VCC1 | Primary supply input (1.8V–5.0V); powers core logic and references RST/PFO outputs |
| 7 | PFI | Power-fail monitor input (high-impedance); compares against 626mV reference |
| 8 | WDI | Watchdog input; rising/falling edge resets 1.12s timeout; 35s initial window after reset |
Key Features
| Feature | Design Value |
|---|---|
| Triple-supply monitoring | Simultaneous VCC1 (4.625V), VCC2 (3.075V), and RSTIN (0.626V-ref) supervision with independent thresholds |
| Dual-mode watchdog | 35s startup window allows full system boot before enforcing 1.12s runtime watchdog discipline |
| Guaranteed reset validity | Reset output remains logically valid even when VCC1 or VCC2 drops to 0.8V |
| Low-power operation | 14µA typical supply current enables >10-year battery life in always-on monitoring applications |
| No external components required | Internal 50kΩ MR pullup, 626mV RSTIN/PFI references, and push-pull RST eliminate need for pullups or external references |
Applications
| Telecom Power Management | Industrial PLC I/O Modules |
|---|---|
Use Scenario: Monitoring primary 4.8V DC/DC output, secondary 3.3V logic rail, and auxiliary 1.2V FPGA core supply in a remote radio unit. IC Role / Device Role / Timing Role: Triple-supply supervisor asserting synchronized reset during brownout on any rail, with 210ms hold time ensuring FPGA configuration integrity. Use Value: Prevents partial configuration lockup by guaranteeing all supplies stabilize before release, eliminating field-replaceable unit failures. | Use Scenario: Supervising 24V field bus input (via resistor divider to RSTIN), 5V controller rail (VCC1), and 3.3V sensor interface (VCC2) in a DIN-rail mounted PLC module. IC Role / Device Role / Timing Role: RSTIN monitors undervoltage on 24V bus; VCC1/VCC2 track local rails; push-pull RST directly drives isolated reset input of ARM Cortex-M7 MCU. Use Value: Enables single-chip supervision of mixed-voltage domains without external comparators or level shifters. |
| Network Switch ASIC Boot | Battery-Powered Medical Monitor |
Use Scenario: Ensuring clean power-up of multi-rail ASIC (1.0V core, 1.8V I/O, 3.3V management) in a 10G Ethernet switch line card. IC Role / Device Role / Timing Role: VCC1 = 3.3V management rail, VCC2 = 1.8V I/O rail, RSTIN = 1.0V core rail (via divider); 210ms timeout matches ASIC boot ROM execution window. Use Value: Eliminates need for discrete RC reset circuits while meeting ASIC vendor's strict reset timing windows. | Use Scenario: Supervising lithium coin-cell backup (RSTIN via divider), main 3.3V LDO output (VCC1), and 1.8V sensor rail (VCC2) in a portable ECG device. IC Role / Device Role / Timing Role: Ultra-low 14µA ICC1/ICC2 extends battery life; RSTIN detects backup cell depletion; MR enables user-initiated self-test reset. Use Value: Achieves >5-year shelf life with integrated supervision, reducing BOM count and PCB area vs. discrete solutions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar triple-voltage supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6725KAUTD3+T | Open-drain RST and RST2 outputs (vs. push-pull RST only); same thresholds, timeout, and features | Requires external pullup resistor; suitable where reset must be shared across multiple voltage domains | Select when system needs wired-OR reset bus or level translation capability |
| TPS3808G33DBVR | Single-supply monitor (3.3V only); no RSTIN/PFI/WDI; 200ms timeout; 1.6µA ICC | Lacks triple-monitoring, watchdog, and manual reset; designed for simpler, ultra-low-power applications | Select only for cost-sensitive 3.3V-only systems where auxiliary monitoring is handled externally |
Compared with MAX6726KAYDD3+T, MAX6725KAUTD3+T offers open-drain flexibility at the cost of added external components, while TPS3808G33DBVR reduces feature set and current draw but sacrifices triple-supply coverage and watchdog functionality essential for complex embedded systems.
Availability
MAX6726KAYDD3+T is available at Aetrix Electronics and suitable for telecom infrastructure, industrial PLCs, and medical monitoring equipment requiring stable component supply, long-term lifecycle support, and guaranteed lead-free compliance.
Supply support for MAX6726KAYDD3+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 compact, ultra-low-power supervisory solutions optimized for multivoltage embedded systems where reliability, small footprint, and guaranteed reset behavior under brownout conditions are critical.
FAQ
What is the exact reset threshold voltage for VCC1 on the MAX6726KAYDD3+T?
The MAX6726KAYDD3+T has a factory-trimmed VCC1 reset threshold of 4.625V, with ±1.5% tolerance over the full -40°C to +85°C operating temperature range. This value is encoded in the "Y" suffix per Maxim's Reset Voltage Threshold Suffix Guide and is verified in the Electrical Characteristics table of the official datasheet.
Does the MAX6726KAYDD3+T support monitoring a negative supply voltage?
Yes - the MAX6726KAYDD3+T can monitor negative supplies using the PFI input with an appropriate resistor-divider network as shown in Figure 3b of the datasheet. When the negative supply drops, PFO asserts low; accuracy depends on PFI threshold tolerance (626.5mV ±15mV), resistor matching, and VCC stability.
What is the function of Pin 4 (PFO) on the MAX6726KAYDD3+T?
Pin 4 is the active-low power-fail output (PFO), implemented as a push-pull driver referenced to VCC1. It asserts low when the PFI input voltage falls below the 626.5mV internal reference, with a typical 2µs propagation delay. Unlike RST, PFO deasserts immediately upon PFI recovery - no timeout period is applied.
How does the watchdog timer behave after power-up on the MAX6726KAYDD3+T?
After power-up or any reset event, the MAX6726KAYDD3+T watchdog enters a 35s minimum startup period. Only after the first valid WDI edge (rising or falling) within that window does the timer switch to its 1.12s minimum normal mode. This prevents false timeouts during lengthy firmware initialization sequences.
Is an external pullup resistor required for the RST output of the MAX6726KAYDD3+T?
No - the MAX6726KAYDD3+T features a push-pull RST output referenced to VCC1, capable of sourcing up to 800µA at VOH ≥ 0.8×VCC1 and sinking up to 3.2mA at VOL ≤ 0.4V. External pullups are unnecessary unless interfacing with open-collector systems requiring wired-OR logic.
MAX6726KAYDD3+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:
- 0.788V, 2.188V, 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
MAX6726KAYDD3+T FAQ
1.How can I place an order for MAX6726KAYDD3+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6726KAYDD3+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 MAX6726KAYDD3+T reliable?
The price and inventory of MAX6726KAYDD3+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6726KAYDD3+T is usually 5 days.
3.What payment methods are accepted for MAX6726KAYDD3+T?
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MAX6726KAYDD3+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6726KAYDD3+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 MAX6726KAYDD3+T?
For technical support, including MAX6726KAYDD3+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6726KAYDD3+T requirements.
6.How does Aetrix verify that MAX6726KAYDD3+T is sourced from the original manufacturer or authorized distributors?
All MAX6726KAYDD3+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 MAX6726KAYDD3+T meets industry standards.
7.What is the process for return or replacement of MAX6726KAYDD3+T?
All MAX6726KAYDD3+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6726KAYDD3+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 MAX6726KAYDD3+T part is unused and in its original packaging.
Return procedure for MAX6726KAYDD3+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX6726KAYDD3+T Tags
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