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Analog Devices Inc./Maxim Integrated MAX6726KAVDD3+
- Part No.:
- MAX6726KAVDD3+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-8
- Datasheet:
-
MAX6726KAVDD3+.pdf
- Description:
- IC SUPERVISOR 3 CHANNEL SOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:678
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Product details
Overview
MAX6726KAVDD3+ from Maxim Integrated is a triple-voltage microprocessor supervisory circuit in an 8-pin SOT23 package, monitoring VCC1 (primary), VCC2 (secondary), and RSTIN (adjustable third supply) with factory-trimmed thresholds of 3.075V (VTH1), 2.925V (VTH2), and 626.5mV internal reference for RSTIN. It provides push-pull active-low RST and RST2 outputs, manual reset input (MR), watchdog timer (1.12s normal / 35s startup timeout), and operates from -40°C to +85°C. Used in multivoltage embedded systems requiring reliable power sequencing and brownout detection.
For engineers reviewing the MAX6726KAVDD3+ datasheet, MAX6726KAVDD3+ pinout, MAX6726KAVDD3+ application, or MAX6726KAVDD3+ equivalent, key selection criteria include its triple-supply monitoring capability, guaranteed reset validity down to VCC1/VCC2 = 0.8V, 14µA typical supply current at 3.6V, push-pull output drive referenced to VCC1 and VCC2 respectively, and compatibility with battery-operated and industrial equipment where low-voltage supervision and watchdog safety are critical.
Technical Context
The MAX6726KAVDD3+ integrates dual independent voltage comparators for VCC1 and VCC2, plus a high-impedance RSTIN comparator with 626.5mV internal reference, enabling precise external threshold setting via resistor divider. Its reset logic asserts RST and RST2 low when any monitored supply falls below its threshold or MR is pulled low, maintaining assertion for a factory-set 210ms (min) timeout period after recovery.
It features a dual-mode watchdog timer: 35s minimum initial timeout after reset for system boot, followed by 1.12s minimum normal-mode timeout triggered by WDI edge transitions. The device guarantees valid reset output states even when VCC1 or VCC2 drops to 0.8V, and includes immunity to short VCC transients via built-in glitch rejection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC1 Reset Threshold | 3.075V (typ), factory-trimmed - ensures reliable reset assertion during primary supply brownout at nominal 3.3V rail |
| VCC2 Reset Threshold | 2.925V (typ), factory-trimmed - monitors secondary supply (e.g., I/O rail) with tight tolerance for stable dual-rail systems |
| RSTIN Reference Voltage | 626.5mV (typ) - enables accurate external monitoring of auxiliary supplies ≥0.62V using resistor divider |
| Reset Timeout Period | 210ms (min), D3 suffix - provides sufficient hold time for processor initialization and peripheral stabilization |
| Supply Current | 14µA (typ) at 3.6V - minimizes quiescent power draw in battery-powered and energy-sensitive applications |
| Operating Temperature | -40°C to +85°C - supports industrial and telecom environments without derating |
| Watchdog Timeout | 1.12s (min) normal mode, 35s (min) startup mode - balances fast fault response with safe boot window |
Pinout & Package
MAX6726KAVDD3+ is housed in an 8-pin SOT23-8 package (3.0mm × 1.6mm × 1.1mm), optimized for space-constrained PCB layouts while supporting full triple-supply supervision and dual reset outputs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RST | Active-low push-pull reset output referenced to VCC1; asserts low on fault and holds for 210ms timeout |
| 2 | GND | Ground reference for all internal comparators and output drivers |
| 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 low when PFI < 626.5mV, deasserts immediately on recovery |
| 5 | VCC2 | Secondary supply input powering VCC2 comparator and RST2 output driver; sets VTH2 threshold |
| 6 | VCC1 | Primary supply input powering core logic, VCC1 comparator, and RST output driver; sets VTH1 threshold |
| 7 | PFI | Power-fail monitor input with 626.5mV internal reference; used with external divider to detect auxiliary supply failure |
| 8 | RST2 | Active-low push-pull reset output referenced to VCC2; independently driven but shares same reset logic as RST |
Key Features
| Feature | Design Value |
|---|---|
| Triple-supply monitoring | Simultaneous supervision of VCC1 (3.075V), VCC2 (2.925V), and RSTIN (626.5mV ref) enables robust multirail system integrity |
| Dual push-pull reset outputs | RST (VCC1-referenced) and RST2 (VCC2-referenced) eliminate need for external pullups and support independent rail reset signaling |
| Guaranteed reset validity to 0.8V | Ensures deterministic reset behavior even during deep brownout conditions on either supply rail |
| Dual-mode watchdog timer | 35s startup timeout prevents spurious resets during boot; 1.12s normal timeout delivers rapid fault detection post-initialization |
| Low 14µA supply current | Reduces standby power in always-on subsystems and extends battery life in portable equipment |
Applications
| Industrial PLC Controller | Network Router Power Management |
|---|---|
|
Use Scenario: Supervises 3.3V CPU core, 2.5V I/O, and 1.2V auxiliary bias rails in a DIN-rail mounted programmable logic controller. IC Role / Device Role / Timing Role: Triple-voltage supervisor asserting coordinated reset across rails and triggering watchdog if firmware hangs during cyclic scan execution. Use Value: Prevents corrupted state machine operation during undervoltage events and ensures deterministic recovery after power interruption. |
Use Scenario: Monitors main 5V DC/DC output, 3.3V PHY supply, and backup 3.3V LDO in enterprise-grade Ethernet router with PoE support. IC Role / Device Role / Timing Role: Dual reset outputs isolate CPU and PHY reset domains; PFI detects early AC adapter failure before main rail collapse. Use Value: Enables graceful shutdown of packet buffers and MAC layer before power loss, preserving forwarding table integrity. |
| Medical Infusion Pump | Smart Energy Meter |
|
Use Scenario: Supervises 3.3V MCU, 2.8V display driver, and 1.8V sensor interface in Class II battery-backed infusion pump with safety-critical firmware. IC Role / Device Role / Timing Role: Watchdog enforces software health checks every 1.12s; MR allows clinician-initiated reset without cycling main power. Use Value: Meets IEC 62304 SW safety requirements by detecting stuck threads and forcing controlled reinitialization of motor control loops. |
Use Scenario: Monitors 3.3V metering SoC, 2.5V ADC reference, and 1.2V RTC backup supply in ANSI C12.20-certified electricity meter with tamper detection. IC Role / Device Role / Timing Role: RST2 drives isolated reset to RTC domain; PFO triggers nonvolatile event logging upon detected AC mains sag. Use Value: Maintains accurate timekeeping and tamper audit trail during grid instability, satisfying regulatory data retention mandates. |
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+ | Same 8-pin SOT23 package, identical VTH1/VTH2/RSTIN thresholds and D3 timeout, but provides open-drain RST and push-pull RST2 outputs instead of dual push-pull | Suitable where level-shifting or wired-OR reset bus is required; not ideal for direct VCC1/VCC2-referenced drive without pullups | Select MAX6725KAUTD3+ only if open-drain flexibility is needed on primary reset path; MAX6726KAVDD3+ preferred for simplified layout and stronger drive |
| TPS3808G33DBVR | Single-supply (3.3V only), no RSTIN or PFI, 200ms timeout, 1.6µA supply current - lacks triple-monitoring and dual reset outputs | Limited to single-rail systems; cannot replace MAX6726KAVDD3+ in multivoltage designs without redesign | Consider only for cost-sensitive, single-rail applications where auxiliary monitoring and dual reset are unnecessary |
Compared with MAX6725KAUTD3+, MAX6726KAVDD3+ offers superior drive strength and eliminates external pullup components on both RST and RST2; versus TPS3808G33DBVR, it delivers essential triple-supply coverage and watchdog safety for complex embedded systems - making it the optimal choice for industrial and medical multirail supervision.
Availability
MAX6726KAVDD3+ is available at Aetrix Electronics and suitable for industrial PLC controllers, network router power management, medical infusion pumps, and smart energy meters requiring stable component supply, long-term lifecycle support, and guaranteed lead-free compliance.
Supply support for MAX6726KAVDD3+ 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, automotive, and communications markets.
The MAX6715–MAX6729 family was designed specifically for ultra-low-voltage microprocessor supervision in multirail systems, emphasizing guaranteed reset validity at sub-1V supplies, minimal quiescent current, and flexible monitoring of primary, secondary, and auxiliary power domains.
FAQ
What is the exact reset threshold voltage for VCC1 on the MAX6726KAVDD3+?
The MAX6726KAVDD3+ has a factory-trimmed VCC1 reset threshold of 3.075V (typical), with a guaranteed range of 3.000V to 3.150V over temperature. This value is encoded in the "V" suffix per Maxim's Reset Voltage Threshold Suffix Guide and applies specifically to the MAX6726KAVDD3+ variant - not the broader MAX6726 family.
Does the MAX6726KAVDD3+ support monitoring a third supply voltage, and how is it configured?
Yes, the MAX6726KAVDD3+ supports third-supply monitoring via the RSTIN pin, which uses an internal 626.5mV reference. To monitor an external voltage (e.g., 1.2V or 5V), connect a resistor divider between that supply and GND, with the midpoint feeding RSTIN. The threshold is set by VEXT = 626.5mV × (R1 + R2)/R2, where R2 connects to GND.
What are the reset timeout and watchdog timeout periods for the MAX6726KAVDD3+?
The MAX6726KAVDD3+ features a 210ms (minimum) reset timeout period (D3 suffix) and a dual-mode watchdog: 35s minimum initial timeout after power-up or reset, followed by 1.12s minimum normal-mode timeout. Both are factory-programmed and do not require external components.
How does the MAX6726KAVDD3+ ensure reliable reset operation during low-VCC conditions?
The MAX6726KAVDD3+ guarantees valid reset output logic states down to VCC1 or VCC2 = 0.8V - verified across temperature and process corners. This ensures deterministic reset assertion even during deep brownouts, unlike many supervisors that fail below 1.0V. Its internal bandgap and comparator design maintain accuracy without external biasing.
Can the MAX6726KAVDD3+ be used in place of the MAX6725KAUTD3+ without PCB changes?
No - although both are 8-pin SOT23 triple supervisors with identical thresholds and timeout, MAX6726KAVDD3+ uses push-pull RST and RST2 outputs, whereas MAX6725KAUTD3+ uses open-drain RST and push-pull RST2. Swapping requires verifying pullup requirements on RST and confirming voltage referencing - not a drop-in replacement.
MAX6726KAVDD3+ 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, 1.575V, 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
MAX6726KAVDD3+ FAQ
1.How can I place an order for MAX6726KAVDD3+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6726KAVDD3+ 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 MAX6726KAVDD3+ reliable?
The price and inventory of MAX6726KAVDD3+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6726KAVDD3+ is usually 5 days.
3.What payment methods are accepted for MAX6726KAVDD3+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6726KAVDD3+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6726KAVDD3+?
MAX6726KAVDD3+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6726KAVDD3+ 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 MAX6726KAVDD3+?
For technical support, including MAX6726KAVDD3+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6726KAVDD3+ requirements.
6.How does Aetrix verify that MAX6726KAVDD3+ is sourced from the original manufacturer or authorized distributors?
All MAX6726KAVDD3+ 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 MAX6726KAVDD3+ meets industry standards.
7.What is the process for return or replacement of MAX6726KAVDD3+?
All MAX6726KAVDD3+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6726KAVDD3+, 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 MAX6726KAVDD3+ part is unused and in its original packaging.
Return procedure for MAX6726KAVDD3+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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