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Analog Devices Inc./Maxim Integrated MAX6726KAZGD3+
- Part No.:
- MAX6726KAZGD3+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-8
- Datasheet:
-
MAX6726KAZGD3+.pdf
- Description:
- IC SUPERVISOR 3 CHANNEL SOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:944
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Product details
Overview
MAX6726KAZGD3+ from Maxim Integrated is a triple-voltage microprocessor supervisory circuit in an 8-pin SOT23 package, monitoring VCC1 (1.62V threshold), VCC2 (2.313V threshold), and RSTIN (626.5mV reference) with 210ms reset timeout, push-pull RST and RST2 outputs, manual reset input, and watchdog timer - used in multivoltage telecom and industrial power management systems.
For engineers reviewing the MAX6726KAZGD3+ datasheet, MAX6726KAZGD3+ pinout, MAX6726KAZGD3+ application, or MAX6726KAZGD3+ equivalent, key selection criteria include dual-supply monitoring range (1.8–5.0V / 0.9–3.3V), guaranteed reset validity down to VCC = 0.8V, 14µA typical supply current at 3.6V, and compatibility with battery-operated and space-constrained embedded designs.
Technical Context
The MAX6726KAZGD3+ integrates three independent voltage monitors: primary (VCC1), secondary (VCC2), and adjustable auxiliary (RSTIN) with internal 626.5mV reference. It asserts active-low reset on any undervoltage condition and maintains reset for a factory-set 210ms minimum timeout after recovery.
It features a dual-mode watchdog timer (35s startup / 1.12s normal mode), manual reset input with 50kΩ internal pullup, and separate push-pull RST (VCC1-referenced) and RST2 (VCC2-referenced) outputs - enabling independent reset control for core and I/O rails in complex SoC power domains.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC1 Threshold | 1.620V (factory-trimmed; ensures reliable reset assertion during 1.8V rail brownout) |
| VCC2 Threshold | 2.313V (factory-trimmed; supports 2.5V/3.3V secondary rail monitoring) |
| RSTIN Reference | 626.5mV (enables external resistor-divider to monitor third supply down to 0.62V) |
| Reset Timeout | 210ms min (D3 suffix; provides sufficient hold time for processor initialization) |
| Supply Current | 14µA typ at 3.6V (enables ultra-low-power operation in battery-backed systems) |
| Operating Temp | -40°C to +85°C (supports industrial-grade thermal reliability without derating) |
| Reset Validity | Down to VCC1 or VCC2 = 0.8V (guarantees functional reset state during deep brownout) |
Pinout & Package
MAX6726KAZGD3+ uses an 8-pin SOT23-8 package (2.0mm × 2.1mm × 1.25mm), optimized for high-density PCB layouts in portable and telecom equipment.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RST | Active-low push-pull reset output referenced to VCC1; asserts when VCC1/VCC2/RSTIN drop below thresholds or MR is pulled low |
| 2 | GND | Ground reference for all internal comparators and output drivers |
| 3 | MR | Active-low manual reset input with 50kΩ internal pullup to VCC1; initiates reset on logic-low pulse ≥1µs |
| 4 | PFO | Active-low power-fail output (open-drain); asserts when PFI < 626.5mV; deasserts immediately without timeout |
| 5 | VCC2 | Secondary supply input (0.9–3.3V range); powers internal VCC2 monitor and references RST2 output |
| 6 | VCC1 | Primary supply input (1.8–5.0V range); powers device core and references RST output |
| 7 | RSTIN/PFI | Shared pin: selectable as adjustable reset input (RSTIN) or power-fail monitor input (PFI); high-impedance, 25nA max leakage |
| 8 | RST2 | Active-low push-pull reset output referenced to VCC2; independent of RST for dual-rail reset sequencing |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent reset outputs | RST (VCC1-referenced) and RST2 (VCC2-referenced) enable simultaneous but isolated reset control of core and I/O voltage domains |
| Adjustable third-voltage monitor | RSTIN input with 626.5mV internal reference allows precise monitoring of auxiliary supplies (e.g., 1.2V DDR, 0.9V FPGA core) via external resistor divider |
| Dual-mode watchdog timer | 35s initial timeout after reset enables full system boot; 1.12s normal mode detects runtime software hangs without false triggers |
| Immunity to short VCC transients | Validated against ≤20µs negative-going glitches at 100mV overdrive - eliminates spurious resets in noisy power environments |
| Guaranteed reset at low VCC | Functional reset assertion guaranteed even when VCC1 or VCC2 drops to 0.8V - critical for graceful shutdown in brownout conditions |
Applications
| Telecom Power Sequencing | Industrial PLC Controller |
|---|---|
Use Scenario: Monitoring 3.3V backplane, 1.2V FPGA core, and 2.5V I/O supply in a 4G/LTE base station card. IC Role / Device Role / Timing Role: Triple-supply supervisor providing synchronized reset assertion and independent RST/RST2 outputs for staggered rail enable sequencing. Use Value: Prevents configuration lockup by ensuring FPGA core powers up before I/O, using RST2 to delay peripheral initialization until VCC2 stabilizes. | Use Scenario: Supervising 24V DC input, 5V logic rail, and 3.3V microcontroller supply in an industrial programmable logic controller. IC Role / Device Role / Timing Role: Primary supervisory IC detecting undervoltage on all three rails and asserting reset to halt unsafe operation during mains dip. Use Value: Enables fail-safe shutdown within 210ms of fault detection, preserving program memory integrity and preventing relay chatter during brownout. |
| Battery-Operated Medical Monitor | Set-Top Box Power Management |
Use Scenario: Monitoring Li-ion battery voltage (via RSTIN divider), 3.3V MCU supply, and 1.8V sensor interface rail in a portable ECG device. IC Role / Device Role / Timing Role: Low-current (14µA) supervisor extending battery life while providing early low-battery warning via PFO and hard reset on critical undervoltage. Use Value: Uses RSTIN to trigger PFO interrupt at 3.0V battery level, allowing firmware to save data before RST asserts at 2.313V VCC2 collapse. | Use Scenario: Managing 12V input, 5V main logic, and 1.2V SoC core in a digital cable set-top box with fast boot requirements. IC Role / Device Role / Timing Role: Triple-monitor IC coordinating cold-start reset timing and watchdog supervision of bootloader execution. Use Value: Leverages 35s watchdog startup window to complete HDMI handshake and tuner initialization before entering 1.12s runtime monitoring mode. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar triple-voltage supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6725KAZGD3+ | Open-drain RST and RST2 outputs (vs. push-pull on MAX6726KAZGD3+); identical thresholds, timeout, and feature set | Requires external pullup resistors; better suited for wired-OR reset buses or level-shifting interfaces | Select MAX6725KAZGD3+ only if open-drain drive and bus-sharing capability are required; otherwise MAX6726KAZGD3+ simplifies layout with integrated push-pull drive |
| TPS3808G33DBVR | Single-supply monitor (3.3V fixed threshold); no RST2, no RSTIN, no PFI/PFO; 200ms timeout; SOT23-6 package | Lacks triple-monitoring and dual-reset capability; suitable only for basic 3.3V-only systems | Choose TPS3808G33DBVR only for cost-sensitive, single-rail applications where auxiliary monitoring and independent reset outputs are unnecessary |
Compared with MAX6725KAZGD3+, MAX6726KAZGD3+ eliminates external pullups and supports direct drive of µP reset pins; versus TPS3808G33DBVR, it adds essential triple-rail coverage and dual-reset flexibility for modern multivoltage SoC platforms.
Availability
MAX6726KAZGD3+ is available at Aetrix Electronics and suitable for telecom infrastructure, industrial PLCs, and battery-powered medical devices requiring stable component supply, long-term lifecycle support, and guaranteed lead-free compliance.
Supply support for MAX6726KAZGD3+ 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 power management, sensing, and connectivity in demanding industrial, automotive, and communications applications.
The MAX6715–MAX6729 family delivers ultra-low-voltage, multi-rail supervisory circuits targeting space-constrained, multivoltage embedded systems where reliability, low quiescent current, and flexible reset architecture are critical.
FAQ
What is the exact reset threshold voltage for VCC1 on the MAX6726KAZGD3+?
The MAX6726KAZGD3+ has a factory-trimmed VCC1 reset threshold of 1.620V (minimum), 1.665V (typical), and 1.710V (maximum) - denoted by the 'Z' suffix in the part number per Maxim's Reset Voltage Threshold Suffix Guide. This ensures robust detection of brownout on 1.8V rails while maintaining noise margin.
Does the MAX6726KAZGD3+ support monitoring a third voltage, and how is it configured?
Yes, the MAX6726KAZGD3+ supports third-voltage monitoring via the RSTIN/PFI pin using its internal 626.5mV reference. Configure with a resistor divider where VEXT_TH = 626.5mV × (R1 + R2)/R2. The high-impedance input (±25nA) enables use of megaohm-level resistors to minimize power draw in battery-critical designs.
What are the reset output types and drive capabilities of the MAX6726KAZGD3+?
The MAX6726KAZGD3+ provides two active-low push-pull reset outputs: RST (referenced to VCC1) and RST2 (referenced to VCC2). Both sink ≥1.2mA at VCC ≥2.7V (VOL ≤0.3V) and source ≥500µA (VOH ≥0.8×VCC), eliminating need for external pullups and enabling direct connection to most µP reset inputs.
How does the watchdog timer operate on the MAX6726KAZGD3+?
The MAX6726KAZGD3+ watchdog timer operates in dual mode: a 35s minimum startup period after any reset (power-up, MR, or watchdog event), followed by a 1.12s minimum normal timeout. It resets on missing WDI transitions - rising or falling edges - and clears on each valid edge, making it ideal for monitoring bootloader and runtime firmware execution.
Is the MAX6726KAZGD3+ compatible with 0.8V supply operation, and what does that mean for system design?
Yes, the MAX6726KAZGD3+ guarantees valid reset output logic states down to VCC1 or VCC2 = 0.8V. This means the device remains fully functional during deep brownout conditions, allowing controlled system shutdown before supply collapse - a critical capability for data retention and safe power-down sequencing in industrial and telecom equipment.
MAX6726KAZGD3+ 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, 2.313V, 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
MAX6726KAZGD3+ FAQ
1.How can I place an order for MAX6726KAZGD3+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6726KAZGD3+ 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 MAX6726KAZGD3+ reliable?
The price and inventory of MAX6726KAZGD3+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6726KAZGD3+ is usually 5 days.
3.What payment methods are accepted for MAX6726KAZGD3+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6726KAZGD3+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6726KAZGD3+?
MAX6726KAZGD3+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6726KAZGD3+ 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 MAX6726KAZGD3+?
For technical support, including MAX6726KAZGD3+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6726KAZGD3+ requirements.
6.How does Aetrix verify that MAX6726KAZGD3+ is sourced from the original manufacturer or authorized distributors?
All MAX6726KAZGD3+ 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 MAX6726KAZGD3+ meets industry standards.
7.What is the process for return or replacement of MAX6726KAZGD3+?
All MAX6726KAZGD3+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6726KAZGD3+, 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 MAX6726KAZGD3+ part is unused and in its original packaging.
Return procedure for MAX6726KAZGD3+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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