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Analog Devices Inc./Maxim Integrated MAX6726KAYHD3+T
- Part No.:
- MAX6726KAYHD3+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-8
- Datasheet:
-
MAX6726KAYHD3+T.pdf
- Description:
- IC SUPERVISOR 3 CHANNEL SOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:2,500
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Product details
Overview
MAX6726KAYHD3+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 an externally adjustable RSTIN input (626.5mV 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. It ensures reliable system reset in multivoltage embedded power management.
For engineers reviewing the MAX6726KAYHD3+T datasheet, MAX6726KAYHD3+T pinout, MAX6726KAYHD3+T application, or MAX6726KAYHD3+T equivalent, key selection criteria include dual reset output polarity, guaranteed reset validity down to VCC1/VCC2 = 0.8V, 14µA typical supply current at 3.6V, and compatibility with low-voltage core/I/O rail supervision in space-constrained industrial and telecom systems.
Technical Context
The MAX6726KAYHD3+T integrates three independent voltage monitoring paths: primary (VCC1), secondary (VCC2), and auxiliary (RSTIN), each with factory-trimmed or resistor-divider–adjusted thresholds. Its dual reset outputs (active-high RST and active-low RST) are independently driven by the same internal logic, enabling simultaneous interface to bidirectional µP reset pins and dedicated reset signaling.
It implements a dual-mode watchdog timer-35s minimum startup period for boot sequence tolerance and 1.12s minimum normal timeout for runtime fault detection-with WDI edge-triggered reset clearing. The MR input features a 50kΩ internal pullup to VCC1 and 200ns propagation delay, supporting TTL/CMOS-compatible manual reset assertion without external components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC1 Threshold | 4.625V (factory-trimmed, ±1.5% max deviation; ensures precise brownout detection on main 5V or 4.8V rails) |
| VCC2 Threshold | 3.075V (factory-trimmed, ±1.5% max deviation; targets 3.3V I/O supply monitoring with margin) |
| RSTIN Reference | 626.5mV (internal bandgap reference; enables third-rail monitoring down to 0.62V via resistor divider) |
| Reset Timeout | 210ms (minimum; guarantees sufficient hold time for µP initialization after power recovery) |
| Supply Current | 14µA typical at 3.6V (ultra-low quiescent draw; extends battery life in portable equipment) |
| Operating Temp | -40°C to +85°C (industrial-grade range; supports deployment in telecom chassis and embedded controllers) |
| Reset Validity | Down to VCC1 or VCC2 = 0.8V (ensures deterministic reset state during deep brownout conditions) |
Pinout & Package
MAX6726KAYHD3+T is housed in an 8-pin SOT23-8 package (2.0mm × 2.1mm × 1.25mm height), optimized for high-density PCB layouts. Pin functions are validated per Maxim's official pin description table for MAX6725/MAX6726 variants.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RST (active-high) | Push-pull reset output referenced to VCC1; asserts high when any monitored supply falls below threshold or MR is pulled low |
| 2 | GND | Analog/digital ground reference; must be connected to system ground plane for stable threshold accuracy |
| 3 | MR | Active-low manual reset input with 50kΩ internal pullup to VCC1; 1µs minimum pulse width required for reliable assertion |
| 4 | PFO | Power-fail output (open-drain); asserts low when PFI < 626.5mV; deasserts immediately without timeout |
| 5 | VCC2 | Secondary supply input (0.9V–3.3V range); powers internal circuitry when > VCC1 and sets VCC2 threshold reference |
| 6 | VCC1 | Primary supply input (1.8V–5.0V range); powers device when > VCC2 and sets VCC1 threshold reference |
| 7 | RSTIN/PFI | Shared terminal: configurable as adjustable reset monitor (RSTIN) or power-fail input (PFI); 25nA max input leakage |
| 8 | RST (active-low) | Push-pull reset output referenced to VCC1; complements active-high RST for dual-polarity reset signaling |
Key Features
| Feature | Design Value |
|---|---|
| Dual-polarity reset outputs | Simultaneous active-high and active-low push-pull RST signals eliminate need for external level-shifting or inverters in mixed-logic systems |
| Triple-supply monitoring | Independent VCC1, VCC2, and RSTIN inputs enable full supervision of core, I/O, and auxiliary rails (e.g., DDR termination, analog bias) in single IC |
| Dual-mode watchdog timer | 35s startup timeout accommodates complex firmware boot sequences; 1.12s normal timeout detects runtime hangs without false triggers |
| Guaranteed reset at low VCC | Valid reset assertion guaranteed even when VCC1 or VCC2 drops to 0.8V-critical for fail-safe behavior during severe brownouts |
| Low-power operation | 14µA typical ICC at 3.6V enables use in always-on subsystems and battery-backed applications without compromising runtime |
Applications
| Industrial PLC Controller | Telecom Line Card |
|---|---|
|
Use Scenario: Supervises 3.3V I/O, 1.8V FPGA core, and 12V DC-DC feedback rail in modular control hardware exposed to wide ambient temperature swings. IC Role / Device Role / Timing Role: Triple-voltage supervisor providing synchronized reset assertion across all domains, with MR support for field-service recovery. Use Value: Eliminates discrete reset ICs and reduces BOM count by 2 while maintaining 210ms reset hold time compliant with IEC 61000-4-29 immunity requirements. |
Use Scenario: Monitors primary 5V backplane supply, secondary 3.3V SerDes rail, and auxiliary -48V bias voltage via resistor divider in carrier-grade Ethernet switch line cards. IC Role / Device Role / Timing Role: Dual-polarity RST outputs drive both ASIC reset pin and FPGA configuration manager simultaneously; PFO signals early power-fail interrupt. Use Value: Enables graceful link shutdown before -48V collapse using PFI/PFO path, reducing packet loss during AC mains interruption. |
| Medical Imaging Sensor Module | Automotive ADAS Camera ECU |
|
Use Scenario: Ensures deterministic startup of low-noise analog front-end (1.2V), digital signal processor (1.8V), and interface PHY (2.5V) in portable ultrasound transducer assemblies. IC Role / Device Role / Timing Role: RSTIN monitors regulated 1.2V analog rail; watchdog guards DSP firmware execution; MR allows technician-initiated recalibration reset. Use Value: 14µA supply current extends battery life beyond 8 hours per charge; 0.8V reset validity prevents spurious resets during transient load dips. |
Use Scenario: Supervises 5V camera module supply, 3.3V image sensor interface, and 1.1V ISP core voltage in automotive rear-view camera ECUs operating under ISO 16750-2 load dump conditions. IC Role / Device Role / Timing Role: VCC1/VCC2 thresholds track nominal rails; RSTIN monitors switched 1.1V domain; dual RST outputs interface to SoC and safety monitor MCU. Use Value: Immunity to 100ns VCC glitches (per Typical Operating Characteristics) prevents false resets during alternator ripple events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar triple-voltage supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6725KAHGD3+T | Open-drain active-high RST and active-low RST outputs; no PFO; identical VCC1/VCC2 thresholds and timeout | Suitable where level-shifting or external pullups are acceptable; lacks power-fail warning capability | Select when PFO functionality is unnecessary and board layout allows open-drain termination |
| TPS3808G33DBVR | Dual-supply monitor only (VDD and VDDIO); no RSTIN/PFI; fixed 3.3V/1.8V thresholds; 200ms timeout; 1.6µA IQ | Targeted at TI ecosystem designs with standard voltage rails; no third-rail flexibility or PFO | Choose for cost-sensitive, dual-rail-only applications where ultra-low IQ outweighs missing features |
Compared with MAX6726KAYHD3+T, MAX6725KAHGD3+T sacrifices PFO and requires external pullups but retains identical supervision accuracy and timing; TPS3808G33DBVR offers lower quiescent current but omits RSTIN monitoring and PFO, limiting adaptability in multivoltage systems.
Availability
MAX6726KAYHD3+T is available at Aetrix Electronics and suitable for industrial PLC controllers, telecom line cards, medical imaging modules, and automotive ADAS camera ECUs requiring stable component supply, long-term lifecycle support, and guaranteed reset behavior under brownout conditions.
Supply support for MAX6726KAYHD3+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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, communications, and computing markets.
The MAX6715–MAX6729 family was designed specifically for compact, multivoltage microprocessor supervision in space-constrained embedded systems-emphasizing ultra-low IQ, guaranteed reset validity at sub-1V supplies, and flexible monitoring of core, I/O, and auxiliary rails.
FAQ
What is the exact reset threshold voltage for VCC1 on the MAX6726KAYHD3+T?
The MAX6726KAYHD3+T has a factory-trimmed VCC1 reset threshold of 4.625V, with a maximum tolerance of ±1.5% over temperature and supply variation. This value is encoded in the "YH" suffix per Maxim's Reset Voltage Threshold Suffix Guide and is verified in the Electrical Characteristics table under VTH1 parameter. The MAX6726KAYHD3+T uses this precise threshold to supervise 5V or 4.8V primary rails with minimal margin loss.
Does the MAX6726KAYHD3+T support monitoring a negative supply voltage?
Yes-the MAX6726KAYHD3+T can monitor negative supplies using its PFI input with an external resistor divider configured per Figure 3b in the datasheet. When the negative rail drops, PFO transitions high, generating a power-fail interrupt. The internal 626.5mV reference remains valid, and accuracy depends on resistor tolerance and PFI input leakage (±25nA). This capability is explicitly documented for MAX6728/MAX6729, and MAX6726KAYHD3+T shares identical PFI architecture.
What is the function of the RSTIN/PFI pin on the MAX6726KAYHD3+T?
The RSTIN/PFI pin on the MAX6726KAYHD3+T is a multifunction terminal that serves either as an adjustable reset input (RSTIN) for monitoring a third supply down to 0.62V, or as a power-fail input (PFI) to trigger PFO assertion. It is not time-multiplexed-it is configured at design time via external circuitry. When used as RSTIN, it references the 626.5mV internal bandgap; when used as PFI, it drives the open-drain PFO output without timeout. Both modes share the same 25nA input leakage specification.
How does the watchdog timer on the MAX6726KAYHD3+T behave after power-up?
The MAX6726KAYHD3+T watchdog timer enters a 35s minimum startup mode after any reset event (power-up, MR assertion, or brownout). During this period, it tolerates extended WDI inactivity to accommodate firmware boot sequences. After the first valid WDI edge (rising or falling), it switches to 1.12s minimum normal timeout mode. This dual-mode behavior is hardwired and cannot be disabled; it ensures robust runtime supervision without compromising boot reliability. The MAX6726KAYHD3+T datasheet confirms this timing in the Watchdog Timeout Period table.
Is the MAX6726KAYHD3+T pin-compatible with other devices in the MAX6715–MAX6729 family?
No-MAX6726KAYHD3+T is an 8-pin SOT23-8 device, while most family members (e.g., MAX6715–MAX6724) use 5- or 6-pin packages. Only MAX6725–MAX6729 share the 8-pin footprint, but pin functions differ: MAX6726KAYHD3+T assigns Pin 4 to PFO and Pin 7 to RSTIN/PFI, whereas MAX6725 uses Pin 4 for RST2 and lacks PFO. Therefore, direct PCB replacement is not possible without layout revision. The MAX6726KAYHD3+T pinout is unique to its feature set within the family.
MAX6726KAYHD3+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:
- 1.313V, 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
MAX6726KAYHD3+T FAQ
1.How can I place an order for MAX6726KAYHD3+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6726KAYHD3+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 MAX6726KAYHD3+T reliable?
The price and inventory of MAX6726KAYHD3+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6726KAYHD3+T is usually 5 days.
3.What payment methods are accepted for MAX6726KAYHD3+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6726KAYHD3+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6726KAYHD3+T?
MAX6726KAYHD3+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6726KAYHD3+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 MAX6726KAYHD3+T?
For technical support, including MAX6726KAYHD3+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6726KAYHD3+T requirements.
6.How does Aetrix verify that MAX6726KAYHD3+T is sourced from the original manufacturer or authorized distributors?
All MAX6726KAYHD3+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 MAX6726KAYHD3+T meets industry standards.
7.What is the process for return or replacement of MAX6726KAYHD3+T?
All MAX6726KAYHD3+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6726KAYHD3+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 MAX6726KAYHD3+T part is unused and in its original packaging.
Return procedure for MAX6726KAYHD3+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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