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Analog Devices Inc./Maxim Integrated MAX6706AZKA+T
- Part No.:
- MAX6706AZKA+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-8
- Datasheet:
-
MAX6706AZKA+T.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL SOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:7,500
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Product details
Overview
MAX6706AZKA+T from Maxim Integrated is an active-high push-pull microprocessor supervisory IC designed for single-supply voltage monitoring in embedded systems. It provides a guaranteed-reset output down to VCC = 1V, 140ms reset timeout delay, 0.62V power-fail input threshold, and independent watchdog timer with 1.6s timeout - all in an 8-pin SOT23 package. It is used in critical µP power monitoring for white goods and networking equipment.
For engineers reviewing the MAX6706AZKA+T datasheet, MAX6706AZKA+T pinout, MAX6706AZKA+T application, or MAX6706AZKA+T equivalent, key selection criteria include its active-high reset output stage, Z-suffix 2.32V nominal VCC reset threshold, lead-free +T packaging, and compatibility with 2.1V–2.75V supply rails in industrial temperature range (–40°C to +125°C).
Technical Context
The MAX6706AZKA+T implements a precision undervoltage detection circuit with a factory-trimmed 2.32V (typ) reset threshold (Z-suffix), ±30mV accuracy over –40°C to +125°C, and 60ppm/°C temperature coefficient. Its internal watchdog timer monitors WDI transitions and asserts WDO low after 1.6s (typ) of inactivity, while the power-fail comparator uses a stable 0.62V reference to detect falling auxiliary voltages.
Reset assertion is triggered by VCC falling below threshold, MR pull-low, or watchdog timeout; reset remains active for ≥140ms after recovery. The active-high push-pull RESET output drives logic-high during normal operation and transitions low only during fault conditions - a behavior distinct from open-drain or active-low variants in the same family.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Reset Threshold | 2.32V (typ), 2.24V to 2.40V (min/max over –40°C to +125°C); sets precise brownout detection point for 2.1V–2.75V supply rails |
| Reset Timeout Period | 140ms (min), 300ms (max); ensures µP remains held in reset long enough to stabilize after power recovery |
| Watchdog Timeout | 1.12s to 2.52s (–40°C to +125°C); prevents runaway code by forcing WDO assertion if WDI is not toggled within spec window |
| Power-Fail Input Threshold | 0.62V (typ), 593mV to 642mV (min/max); enables early warning of auxiliary rail collapse via external resistor divider |
| Supply Current | 9µA (typ) at VCC < 3.6V; ultra-low quiescent draw preserves battery life in always-on monitoring applications |
| Operating Temperature | –40°C to +125°C; qualified for under-hood automotive, industrial control, and telecom infrastructure environments |
| Package | 8-pin SOT23; surface-mount footprint compatible with high-density PCB layouts and automated assembly |
Pinout & Package
MAX6706AZKA+T is housed in an 8-pin SOT23 package (package code K8+2), measuring 2.9mm × 1.6mm × 1.1mm, RoHS-compliant and lead-free (+T suffix). Pin 1 is MR (manual reset input), Pin 2 is VCC, Pin 3 is GND, Pin 4 is PFI, Pin 5 is PFO, Pin 6 is WDI, Pin 7 is RESET (active-high push-pull), and Pin 8 is WDO (active-low watchdog output).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - MR | Active-low manual reset input | CMOS-compatible input with 50kΩ internal pullup; pulling low forces immediate reset and clears watchdog timer |
| 2 - VCC | Main supply input & primary reset monitor | Supplies internal circuitry and serves as reference for VCC reset threshold detection (2.32V Z-suffix) |
| 3 - GND | Ground reference | Common return path for all analog and digital functions; must be low-impedance for accurate threshold sensing |
| 4 - PFI | Power-fail voltage monitor input | High-impedance node tied to 0.62V internal reference; accepts external resistive divider to monitor secondary supplies |
| 5 - PFO | Power-fail output | Active-low push-pull output asserted when PFI falls below 0.62V; used for early-warning interrupt generation |
| 6 - WDI | Watchdog input | Edge-sensitive input; rising or falling edge resets 1.6s watchdog timer; pulses as short as 50ns are detected |
| 7 - RESET | Active-high reset output | Push-pull output driven high during normal operation; goes low only during reset condition (VCC/MR/WDT fault) |
| 8 - WDO | Active-low watchdog output | Independent watchdog status signal; latched low on timeout or undervoltage; deasserts on valid WDI transition or MR low |
Key Features
| Feature | Design Value |
|---|---|
| Active-high push-pull RESET output | Eliminates need for external pullup resistor; ensures defined logic state during power-up/down without external components |
| Z-suffix 2.32V reset threshold | Optimized for 2.1V–2.75V supply rails (e.g., low-voltage FPGAs, ARM cores, sensor hubs); tighter tolerance than generic 2.5V supervisors |
| Guaranteed reset validity to VCC = 1V | Ensures reliable reset assertion even during deep brownout or battery sag conditions common in portable/industrial systems |
| Independent PFI/PFO comparator | Enables dual-rail monitoring: primary VCC supervision + secondary rail (e.g., I/O or analog supply) fail detection with dedicated interrupt |
| 1.6s watchdog timeout with latchable WDO | Provides deterministic software health check; WDO remains asserted until cleared by WDI edge or MR low - preventing spurious timeouts |
Applications
| Computers | Networking |
|---|---|
Use Scenario: Monitoring 2.5V core supply in compact x86 or RISC-V SBCs during cold-start and thermal throttling. IC Role / Device Role / Timing Role: Active-high RESET output directly interfaces with processor's reset pin; asserts low only during brownout, ensuring deterministic boot sequence. Use Value: Prevents corrupted firmware execution by holding CPU in reset until 2.5V rail stabilizes above 2.32V with 140ms minimum hold time. |
Use Scenario: Supervising PoE-powered switch ASICs where main 3.3V rail and auxiliary 1.8V I/O rail must be sequenced. IC Role / Device Role / Timing Role: PFI monitors 1.8V rail via resistor divider; PFO triggers NMI interrupt before full collapse, enabling graceful packet flush. Use Value: Enables proactive system shutdown using 0.62V reference and <1µs PFI-to-PFO delay - reducing packet loss during power failure. |
| White Goods | Telecommunications |
Use Scenario: Power supervision in smart refrigerator controllers exposed to wide ambient temperature swings (–25°C to +70°C). IC Role / Device Role / Timing Role: Z-suffix 2.32V threshold tracks 2.1V–2.75V supply drift across temperature; 60ppm/°C coefficient minimizes trip-point variation. Use Value: Maintains consistent reset behavior across operating life without recalibration - critical for UL/IEC60730 Class B compliance. |
Use Scenario: Base station remote radio units (RRUs) requiring fail-safe restart after AC dropout or DC-DC converter fault. IC Role / Device Role / Timing Role: WDI connected to FPGA heartbeat signal; WDO feeds watchdog timer enable to power management IC. Use Value: Guarantees automatic recovery within 1.6s + 140ms if software hangs - meeting ITU-T Y.1731 availability targets (>99.999%). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6706AKA+T | A-version: WDO deasserts immediately when VCC recovers (no timeout delay), whereas MAX6706AZKA+T is standard version with latched WDO requiring WDI edge or MR low to clear | Preferred where fast watchdog recovery is needed after transient undervoltage; less suitable for noise-prone environments where latching prevents false clears | Select MAX6706AKA+T only if system firmware can guarantee timely WDI toggling post-recovery; otherwise retain standard MAX6706AZKA+T for robustness |
| TPS3808G125DBVR | TI part with 1.25V fixed reset threshold, 200ms timeout, no PFI/PFO, no watchdog; SOT23-6 package (6 pins vs. 8) | Lacks power-fail warning and watchdog functions; suitable only for basic single-rail reset, not dual-monitoring or safety-critical watchdog use cases | Use TPS3808G125DBVR only when cost and pin count are primary constraints and PFI/PFO/WDT functionality is unnecessary |
Compared with MAX6706AKA+T and TPS3808G125DBVR, MAX6706AZKA+T uniquely combines Z-suffix 2.32V precision threshold, integrated PFI/PFO comparator, and latched watchdog output in an 8-pin SOT23 - making it optimal for space-constrained, dual-rail, safety-aware designs requiring deterministic fault response.
Availability
MAX6706AZKA+T is available at Aetrix Electronics and suitable for white goods, telecommunications infrastructure, and networking equipment requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6706AZKA+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 MAX6701–MAX6708 family was designed specifically for low-voltage microprocessor supervision in space-constrained, high-reliability systems - integrating reset, watchdog, and power-fail monitoring into a single SOT23 package.
FAQ
What is the exact reset threshold voltage for MAX6706AZKA+T?
The MAX6706AZKA+T features a Z-suffix reset threshold of 2.32V (typical), with guaranteed range of 2.24V to 2.40V over –40°C to +125°C. This value is factory-trimmed and specified in the Electrical Characteristics table under "VCC Reset Threshold" for Z/Y versions. It is optimized for 2.1V–2.75V supply rails and exhibits 60ppm/°C temperature coefficient.
Does MAX6706AZKA+T provide an active-high or active-low reset output?
MAX6706AZKA+T provides an active-high push-pull RESET output - meaning it drives logic-high during normal operation and transitions low only during reset conditions (e.g., VCC drop below 2.32V, MR pull-low, or watchdog timeout). This eliminates the need for an external pullup resistor and ensures defined voltage levels across power states.
Can MAX6706AZKA+T monitor a secondary voltage rail besides VCC?
Yes, MAX6706AZKA+T can monitor a secondary rail using its PFI (power-fail input) pin. By connecting an external resistor divider to PFI, users set a custom trip point referenced to the internal 0.62V comparator. When the divided voltage falls below 0.62V, PFO asserts low - enabling early-warning interrupts for auxiliary supplies like I/O or analog rails.
What is the watchdog timeout behavior of MAX6706AZKA+T?
MAX6706AZKA+T has a watchdog timeout period of 1.12s to 2.52s over –40°C to +125°C (1.6s typical). WDO is latched low upon timeout and remains asserted until cleared by either a valid edge on WDI or pulling MR low. Unlike A-versions, the standard MAX6706AZKA+T does not auto-clear WDO on VCC recovery - ensuring fault persistence until deliberate intervention.
Is MAX6706AZKA+T compatible with lead-free PCB assembly processes?
Yes, MAX6706AZKA+T is RoHS-compliant and rated for lead-free reflow soldering. The "+T" suffix explicitly denotes lead-free tape-and-reel packaging, qualified per JEDEC J-STD-020 moisture sensitivity level 1 (MSL1) and compatible with peak reflow temperatures up to +260°C. No special handling or pre-bake is required.
MAX6706AZKA+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:
- 2
- Voltage - Threshold:
- 2.32V, Adj
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active High
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-8
MAX6706AZKA+T FAQ
1.How can I place an order for MAX6706AZKA+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6706AZKA+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 MAX6706AZKA+T reliable?
The price and inventory of MAX6706AZKA+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6706AZKA+T is usually 5 days.
3.What payment methods are accepted for MAX6706AZKA+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6706AZKA+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6706AZKA+T?
MAX6706AZKA+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6706AZKA+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 MAX6706AZKA+T?
For technical support, including MAX6706AZKA+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6706AZKA+T requirements.
6.How does Aetrix verify that MAX6706AZKA+T is sourced from the original manufacturer or authorized distributors?
All MAX6706AZKA+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 MAX6706AZKA+T meets industry standards.
7.What is the process for return or replacement of MAX6706AZKA+T?
All MAX6706AZKA+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6706AZKA+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 MAX6706AZKA+T part is unused and in its original packaging.
Return procedure for MAX6706AZKA+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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