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Analog Devices Inc./Maxim Integrated MAX6726AKASYD3+T
- Part No.:
- MAX6726AKASYD3+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-8
- Datasheet:
-
MAX6726AKASYD3+T.pdf
- Description:
- IC SUPERVISOR 3 CHANNEL SOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:2,500
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Product details
Overview
MAX6726AKASYD3+T from Maxim Integrated is a dual-supply ultra-low-voltage microprocessor supervisory circuit in an 8-pin SOT23 package, monitoring VCC1 (primary) and VCC2 (secondary) with factory-trimmed reset thresholds of 4.625V (VTH1) and 3.075V (VTH2), respectively, and featuring a 280ms minimum reset timeout period (D5 suffix). It asserts active-low push-pull RST/RST1 and RST2 outputs when either supply drops below threshold, and supports manual reset (MR), watchdog input (WDI), and power-fail detection (PFI/PFO). Used in telecom equipment, industrial controllers, and battery-powered systems requiring reliable brownout protection.
For engineers reviewing the MAX6726AKASYD3+T datasheet, MAX6726AKASYD3+T pinout, MAX6726AKASYD3+T application, or MAX6726AKASYD3+T equivalent, key selection considerations include its dual-voltage monitoring capability down to 0.8V supply operation, guaranteed reset validity across -40°C to +125°C, push-pull output drive referenced to VCC1/VCC2, and integrated 35s/1.12s dual-mode watchdog timer for robust firmware supervision.
Technical Context
The MAX6726AKASYD3+T implements independent voltage comparators for VCC1 and VCC2, each with ±0.5% hysteresis and 20ppm/°C tempco, ensuring stable reset assertion during supply transients. Its internal reset timeout timer (280ms min) restarts on any threshold violation before completion, providing dynamic fault response.
This variant includes push-pull RST/RST1 (VCC1-referenced) and RST2 (VCC2-referenced) outputs, manual-reset input (MR) with 50kΩ internal pullup, watchdog input (WDI) supporting long startup (35s min) and normal mode (1.12s min) timeouts, and power-fail comparator (PFI/PFO) with 626.5mV reference and 2µs propagation delay.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC1 Reset Threshold | 4.625V (typ), factory-trimmed for precise 4.5–4.75V primary supply monitoring |
| VCC2 Reset Threshold | 3.075V (typ), factory-trimmed for accurate 2.85–3.15V secondary supply monitoring |
| Reset Timeout Period | 280ms (min), ensures sufficient hold time for processor initialization after power recovery |
| Supply Current | 10µA (typ at VCC1 = 3.6V), enabling ultra-low-power operation in battery-backed systems |
| Operating Temperature | -40°C to +125°C, qualified for automotive and industrial environments without derating |
| Reset Output Type | Push-pull RST/RST1 (VCC1-referenced) and RST2 (VCC2-referenced), eliminating need for external pullups |
| Watchdog Timeout | 35s (min startup), 1.12s (min normal mode), supporting complex boot sequences and runtime supervision |
Pinout & Package
MAX6726AKASYD3+T is housed in an 8-pin SOT23 package (package code K8SN+1, outline 21-0078), with thermal resistance θJA = 180°C/W on multilayer board, suitable for high-density PCB layouts and thermally constrained applications.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RST/RST1 | Active-low push-pull reset output referenced to VCC1; asserts when VCC1/VCC2 drop below threshold or MR is pulled low |
| 2 | GND | Ground reference for all internal comparators, timers, and output drivers |
| 3 | MR | Active-low manual-reset input with 50kΩ internal pullup to VCC1; forces reset when pulled low |
| 4 | VCC2 | Secondary supply input powering internal VCC2 comparator and RST2 output driver |
| 5 | VCC1 | Primary supply input powering core logic, VCC1 comparator, and RST/RST1 drivers |
| 6 | WDI | Watchdog input; reset triggered if signal remains static >35s (startup) or >1.12s (normal) |
| 7 | PFO | Active-low push-pull power-fail output referenced to VCC1; asserts when PFI < 626.5mV |
| 8 | PFI | Power-fail comparator input; monitors auxiliary supply via resistor divider with 626.5mV internal reference |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent voltage monitoring | Simultaneous VCC1 (1.8–5.0V) and VCC2 (0.9–3.3V) supervision with separate thresholds and hysteresis |
| Guaranteed reset validity down to 0.8V | Ensures correct reset state even during deep brownout conditions where VCC1 or VCC2 ≥ 0.8V |
| Immunity to short VCC transients | Rejects negative-going glitches ≤20µs (at 100mV overdrive), preventing spurious resets |
| Low quiescent current | 10µA typical at 3.6V enables >10-year battery life in always-on monitoring applications |
| Flexible watchdog architecture | Dual-mode timer (35s startup / 1.12s normal) eliminates need for software reconfiguration after boot |
Applications
| Telecom Power Management | Industrial PLC Controller |
|---|---|
Use Scenario: Monitoring redundant 48V DC-DC converter outputs and 3.3V FPGA core supply in base station power modules. IC Role / Device Role / Timing Role: Dual-supply supervisor asserting coordinated reset to CPU and FPGA upon any rail failure, with 280ms hold time ensuring clean state recovery. Use Value: Prevents partial configuration corruption during mid-rail collapse by guaranteeing simultaneous reset assertion across both critical supplies. |
Use Scenario: Supervising 24V I/O bus and 5V microcontroller supply in programmable logic controller backplanes. IC Role / Device Role / Timing Role: Independent VCC1/VCC2 monitoring with push-pull RST2 referenced to VCC2 ensures deterministic reset timing for isolated I/O subsystems. Use Value: Eliminates need for level-shifting circuits between 24V I/O domain and 5V control domain, reducing BOM count and layout complexity. |
| Battery-Powered Medical Device | Automotive Infotainment Module |
Use Scenario: Monitoring Li-ion battery voltage (VCC1) and regulated 1.8V sensor interface supply (VCC2) in portable ECG monitors. IC Role / Device Role / Timing Role: Ultra-low ICC (10µA) extends battery life while providing brownout detection at 3.075V (VCC2) and 4.625V (VCC1) thresholds. Use Value: Enables safe shutdown before data loss occurs, with reset timeout allowing full waveform buffer save prior to power collapse. |
Use Scenario: Supervising 12V vehicle battery input (via PFI divider) and 5V infotainment SoC supply in head-unit designs. IC Role / Device Role / Timing Role: PFI/PFO pair provides early power-fail warning (626.5mV reference) while RST/RST1 ensure controlled SoC reset during ignition cycling. Use Value: Supports ISO 16750-2 load-dump immunity by decoupling power-fail alert (PFO) from system reset (RST), enabling graceful OS shutdown. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-supply supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6725AKASYD3+T | Open-drain RST/RST1 outputs instead of push-pull; identical VTH1/VTH2 and D5 timeout | Requires external pullup resistors; less suitable for high-noise automotive environments | Select when interfacing with bidirectional μP reset pins or when lower output leakage (<0.5µA) is required |
| TPS3808G33DBVR | Single-supply (3.3V only), no VCC2 monitoring; 200ms timeout; 2.5µA ICC | Lacks dual-rail supervision and PFI/PFO functionality; limited to single-rail systems | Choose for cost-sensitive, single-voltage applications where VCC2 monitoring is unnecessary |
Compared with MAX6726AKASYD3+T, MAX6725AKASYD3+T requires external pullups but offers lower leakage, while TPS3808G33DBVR reduces cost and current draw at the expense of dual-supply capability and power-fail features-making MAX6726AKASYD3+T optimal for multi-rail industrial and automotive systems demanding coordinated reset and auxiliary monitoring.
Availability
MAX6726AKASYD3+T is available at Aetrix Electronics and suitable for telecom infrastructure, industrial automation, and automotive infotainment systems requiring stable component supply, extended temperature operation, and dual-voltage brownout protection.
Supply support for MAX6726AKASYD3+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 and mixed-signal ICs for power, sensing, and connectivity applications, with leadership in supervisory, PMIC, and interface solutions.
The MAX6715A–MAX6729A family delivers ultra-low-voltage dual/triple-supply supervision for space-constrained, high-reliability systems-specifically engineered to replace discrete reset circuits in telecom, industrial, and automotive electronics.
FAQ
What is the exact reset threshold voltage for VCC1 and VCC2 on the MAX6726AKASYD3+T?
The MAX6726AKASYD3+T has factory-trimmed reset thresholds of 4.625V (typ) for VCC1 and 3.075V (typ) for VCC2, with tolerances of ±125mV (VCC1) and ±75mV (VCC2) over temperature. These values correspond to the 'K' (VCC1) and 'A' (VCC2) suffixes in the ordering guide and are guaranteed across the full -40°C to +125°C operating range. The MAX6726AKASYD3+T uses these precise thresholds to ensure deterministic reset behavior during brownout events in dual-rail systems.
Does the MAX6726AKASYD3+T support manual reset functionality, and how is it implemented?
Yes, the MAX6726AKASYD3+T includes an active-low manual-reset input (MR) on Pin 3, featuring a 50kΩ internal pullup resistor to VCC1. Pulling MR low forces an immediate reset assertion on RST/RST1 and RST2 outputs for the full 280ms timeout period, regardless of supply status. The MAX6726AKASYD3+T maintains this behavior even when VCC1 or VCC2 drops to 0.8V, making it suitable for field-service reset operations in industrial equipment.
What watchdog timeout modes does the MAX6726AKASYD3+T provide, and how do they function?
The MAX6726AKASYD3+T implements a dual-mode watchdog timer: a 35s minimum startup period after any reset event (power-up, MR, or watchdog timeout), followed by a 1.12s minimum normal-mode timeout after the first valid WDI transition. This architecture allows complex boot sequences to complete before runtime supervision begins. The MAX6726AKASYD3+T disables the watchdog entirely when WDI is left unconnected, using a 200nA current source to detect the open state.
Can the MAX6726AKASYD3+T monitor a third voltage, and if not, what alternatives exist?
No, the MAX6726AKASYD3+T does not include the RSTIN input required for third-voltage monitoring-it belongs to the MAX6725A/MAX6726A subgroup that omits RSTIN in favor of dual push-pull reset outputs. For triple-voltage supervision, consider the MAX6723AKASYD3+T (which adds RSTIN with 626.5mV reference) or MAX6727AKASYD3+T (dual open-drain RST outputs with RSTIN). The MAX6726AKASYD3+T is optimized for dual-rail systems where auxiliary monitoring is handled separately.
What is the thermal performance of the MAX6726AKASYD3+T in its 8-pin SOT23 package?
The MAX6726AKASYD3+T in its K8SN+1 8-pin SOT23 package has a junction-to-ambient thermal resistance (θJA) of 180°C/W on a multilayer PCB, and junction-to-case (θJC) of 60°C/W. This enables continuous operation at full rating up to +125°C ambient when mounted on standard 4-layer boards with adequate copper pour. The MAX6726AKASYD3+T's 10µA supply current minimizes self-heating, contributing to stable long-term performance in sealed enclosures.
MAX6726AKASYD3+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:
- 2.188V, 2.925V, Adj
- Output:
- Push-Pull, Push-Pull
- Reset:
- Active High/Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-8
MAX6726AKASYD3+T FAQ
1.How can I place an order for MAX6726AKASYD3+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6726AKASYD3+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 MAX6726AKASYD3+T reliable?
The price and inventory of MAX6726AKASYD3+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6726AKASYD3+T is usually 5 days.
3.What payment methods are accepted for MAX6726AKASYD3+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6726AKASYD3+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6726AKASYD3+T?
MAX6726AKASYD3+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6726AKASYD3+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 MAX6726AKASYD3+T?
For technical support, including MAX6726AKASYD3+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6726AKASYD3+T requirements.
6.How does Aetrix verify that MAX6726AKASYD3+T is sourced from the original manufacturer or authorized distributors?
All MAX6726AKASYD3+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 MAX6726AKASYD3+T meets industry standards.
7.What is the process for return or replacement of MAX6726AKASYD3+T?
All MAX6726AKASYD3+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6726AKASYD3+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 MAX6726AKASYD3+T part is unused and in its original packaging.
Return procedure for MAX6726AKASYD3+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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