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Analog Devices Inc./Maxim Integrated MAX6726KASVD4+T
- Part No.:
- MAX6726KASVD4+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-6
- Datasheet:
-
MAX6726KASVD4+T.pdf
- Description:
- IC SUPERVISOR MPU SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:2,500
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Product details
Overview
MAX6726KASVD4+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, watchdog timer with 35s startup/1.12s normal timeout, and operates from -40°C to +85°C. It ensures reliable system reset in multivoltage embedded power rails for telecom and industrial control.
For engineers reviewing the MAX6726KASVD4+T datasheet, MAX6726KASVD4+T pinout, MAX6726KASVD4+T application, or MAX6726KASVD4+T equivalent, key selection factors include dual reset output polarity, factory-trimmed dual-threshold accuracy (±1.5% over temp), guaranteed reset validity down to VCC = 0.8V, and integrated watchdog with long-initial/short-normal timeout modes.
Technical Context
The MAX6726KASVD4+T implements independent voltage comparators for VCC1 and VCC2 with factory-trimmed thresholds (4.625V and 3.075V), plus a high-impedance RSTIN input referenced to a 626.5mV internal bandgap. Reset assertion occurs when any monitored voltage falls below its threshold, and reset remains asserted for a minimum 210ms timeout period after all voltages recover.
It integrates a dual-mode watchdog timer: 35s minimum initial timeout after power-up/manual reset, transitioning to 1.12s minimum normal timeout after first WDI edge detection. The device supports both push-pull RST (VCC1-referenced) and open-drain RST2 (VCC2-referenced), with MR input featuring 50kΩ internal pullup and 1µs minimum pulse width.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC1 Threshold | 4.625V (factory-trimmed, ±1.5% over -40°C to +85°C); sets primary supply brownout detection point |
| VCC2 Threshold | 3.075V (factory-trimmed, ±1.5% over -40°C to +85°C); sets secondary supply brownout detection point |
| RSTIN Reference | 626.5mV internal bandgap; enables external resistor-divider for third-voltage monitoring down to 0.62V |
| Reset Timeout | 210ms (min); ensures sufficient hold time for processor initialization and peripheral stabilization |
| Watchdog Timeout | 35s (min initial), 1.12s (min normal); accommodates boot sequences then enforces runtime software liveness |
| Supply Current | 14µA (typ at 3.6V); ultra-low quiescent current extends battery life in portable systems |
| Operating Temp | -40°C to +85°C; qualified for industrial and telecom equipment environments |
Pinout & Package
MAX6726KASVD4+T is housed in an 8-pin SOT23-8 package (2.0mm × 2.1mm × 1.25mm), surface-mount, lead-free (+T suffix), with thermal pad exposed on bottom for enhanced heat dissipation.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RST (active-high) | Push-pull reset output referenced to VCC1; asserts high during 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; forces reset when pulled low |
| 4 | PFO | Active-low power-fail output (open-drain); asserts when PFI < 626.5mV, no timeout delay |
| 5 | VCC2 | Secondary supply input (0.9V–3.3V range); powers internal circuitry and sets VCC2 comparator reference |
| 6 | VCC1 | Primary supply input (1.8V–5.0V range); powers core logic and sets VCC1 comparator reference |
| 7 | RSTIN/PFI | Shared pin: selectable as adjustable reset monitor (RSTIN) or power-fail input (PFI); 626.5mV internal reference |
| 8 | RST2 (active-low) | Open-drain reset output referenced to VCC2; asserts low during fault and holds for 210ms timeout |
Key Features
| Feature | Design Value |
|---|---|
| Dual factory-trimmed voltage thresholds | 4.625V (VCC1) and 3.075V (VCC2) with ±1.5% tolerance over full temperature range |
| Externally adjustable third-voltage monitor | RSTIN input with 626.5mV precision reference enables monitoring of supplies as low as 0.62V via resistor divider |
| Dual-mode watchdog timer | 35s minimum initial timeout after reset events, then 1.12s minimum normal timeout after first WDI transition |
| Guaranteed reset validity down to 0.8V | Ensures correct reset state even during deep brownout conditions on either VCC1 or VCC2 |
| Low 14µA supply current | Minimizes standby power draw in battery-powered and energy-sensitive applications |
Applications
| Telecom Power Management | Industrial PLC I/O Modules |
|---|---|
Use Scenario: Monitoring dual DC/DC outputs (5V and 3.3V) in base station power subsystems with backup battery switchover. IC Role / Device Role / Timing Role: Triple-supply supervisor asserting coordinated reset across FPGA, DSP, and transceiver ICs during rail collapse or slow start. Use Value: Prevents partial initialization and metastability by holding reset until both main rails and auxiliary bias are stable for ≥210ms. |
Use Scenario: Ensuring deterministic restart of programmable logic controllers after AC line interruption or brownout. IC Role / Device Role / Timing Role: Supervises 24V field bus supply (VCC1), 5V logic rail (VCC2), and isolated sensor bias (via RSTIN) with manual reset override. Use Value: Guarantees clean firmware reload and I/O state recovery before re-enabling field outputs, eliminating spurious actuation. |
| Network Router Line Cards | Medical Diagnostic Equipment |
Use Scenario: Validating multiple voltage domains (12V, 5V, 1.2V) on high-density switch fabric cards with hot-swap capability. IC Role / Device Role / Timing Role: Monitors primary 5V rail, secondary 1.2V core supply, and auxiliary 3.3V management bus using RSTIN; provides dual-polarity reset signaling. Use Value: Enables simultaneous reset assertion to ASIC and FPGA while allowing independent power sequencing confirmation via RST2. |
Use Scenario: Securing safe shutdown and restart of imaging subsystems (X-ray detector, display controller) during mains fluctuation. IC Role / Device Role / Timing Role: Supervises 28V HV supply (VCC1), 5V analog front-end (VCC2), and isolated 3.3V timing reference (RSTIN) with PFO-triggered emergency save. Use Value: Triggers immediate data preservation via PFO interrupt before full reset, meeting IEC 62304 safety-critical timing requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar supervisory circuit applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6725KA3D4+T | Provides dual open-drain RST outputs (RST/RST2), no push-pull RST; identical thresholds and timeout | Lacks active-high reset signal required for certain µP bidirectional reset pins without external level-shifting | Select when only open-drain drive is needed and board layout avoids contention with bidirectional reset I/O |
| TPS3808G33DBVR | Dual-voltage monitor only (no RSTIN/PFI), fixed 3.3V/1.8V thresholds, 200ms timeout, no watchdog | Cannot monitor third voltage or provide power-fail warning; lacks long-startup watchdog mode | Choose for cost-sensitive dual-rail systems where triple monitoring and watchdog are unnecessary |
Compared with MAX6726KASVD4+T, MAX6725KA3D4+T offers identical supervision functionality but omits the active-high RST output, limiting interface flexibility with modern processors requiring high-asserted reset signals; TPS3808G33DBVR reduces feature set significantly-no third-voltage capability, no watchdog, and fixed thresholds-making it suitable only for simpler, lower-risk applications.
Availability
MAX6726KASVD4+T is available at Aetrix Electronics and suitable for telecom infrastructure, industrial PLCs, network line cards, and medical diagnostic equipment requiring stable component supply, long-lifecycle support, and guaranteed reset integrity under brownout conditions.
Supply support for MAX6726KASVD4+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, multi-rail supervisory circuits optimized for space-constrained systems needing guaranteed reset behavior down to 0.8V and flexible third-voltage monitoring.
FAQ
What is the exact reset timeout period for MAX6726KASVD4+T?
The MAX6726KASVD4+T has a minimum reset timeout period of 210ms, as indicated by the 'D4' suffix in its part number. This duration is guaranteed over the full operating temperature range (-40°C to +85°C) and ensures sufficient hold time for microprocessor and peripheral initialization before release.
Does MAX6726KASVD4+T support monitoring a third voltage, and how is it configured?
Yes, MAX6726KASVD4+T supports third-voltage monitoring via the RSTIN/PFI pin, which functions as RSTIN when used with an external resistor divider. The internal 626.5mV reference allows setting thresholds as low as 0.62V; the formula is VEXT_TH = 626.5mV × ((R1 + R2)/R2), where R1 connects to the monitored supply and R2 to GND.
What are the logic states and drive types of the reset outputs on MAX6726KASVD4+T?
MAX6726KASVD4+T provides two reset outputs: Pin 1 (RST) is an active-high push-pull output referenced to VCC1, and Pin 8 (RST2) is an active-low open-drain output referenced to VCC2. Both assert for the full 210ms timeout period and require no external pull resistors for RST, but RST2 needs an external pullup.
How does the watchdog timer in MAX6726KASVD4+T operate during system startup?
The MAX6726KASVD4+T watchdog features a dual-mode timer: after any reset event (power-up, MR, or watchdog timeout), it enters a 35s minimum initial mode to allow full system boot. Upon detecting the first valid WDI edge, it switches to a 1.12s minimum normal mode, requiring continuous software updates to prevent timeout and reset assertion.
Is MAX6726KASVD4+T guaranteed to maintain valid reset output when VCC drops below 1.0V?
Yes, MAX6726KASVD4+T is explicitly guaranteed to maintain correct reset output logic state down to VCC1 or VCC2 = 0.8V. This ensures reliable brownout detection and reset assertion even during severe supply sag, critical for fail-safe operation in industrial and telecom power systems.
MAX6726KASVD4+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SOT-23-6
- Packaging:
- Bulk
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Multi-Voltage Supervisor
- Number of Voltages Monitored:
- 3
- Voltage - Threshold:
- 1.575V, 2.925V, Adj
- Output:
- Push-Pull, Push-Pull
- Reset:
- Active High/Active Low
- Reset Timeout:
- 1.12s Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-6
MAX6726KASVD4+T FAQ
1.How can I place an order for MAX6726KASVD4+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6726KASVD4+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 MAX6726KASVD4+T reliable?
The price and inventory of MAX6726KASVD4+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6726KASVD4+T is usually 5 days.
3.What payment methods are accepted for MAX6726KASVD4+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6726KASVD4+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6726KASVD4+T?
MAX6726KASVD4+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6726KASVD4+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 MAX6726KASVD4+T?
For technical support, including MAX6726KASVD4+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6726KASVD4+T requirements.
6.How does Aetrix verify that MAX6726KASVD4+T is sourced from the original manufacturer or authorized distributors?
All MAX6726KASVD4+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 MAX6726KASVD4+T meets industry standards.
7.What is the process for return or replacement of MAX6726KASVD4+T?
All MAX6726KASVD4+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6726KASVD4+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 MAX6726KASVD4+T part is unused and in its original packaging.
Return procedure for MAX6726KASVD4+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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