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Analog Devices Inc./Maxim Integrated MAX6706LKA+
- Part No.:
- MAX6706LKA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-8
- Datasheet:
-
MAX6706LKA+.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL SOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:2,074
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Product details
Overview
MAX6706LKA+ 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 precision power-fail detection, and independent watchdog timer with 1.6s timeout - all in an 8-pin SOT23 package for space-constrained industrial controllers and telecom power management.
For engineers reviewing the MAX6706LKA+ datasheet, MAX6706LKA+ pinout, MAX6706LKA+ application, or MAX6706LKA+ equivalent, key selection criteria include its active-high reset output logic, L-suffix 4.63V VCC threshold, integrated manual reset input with 50kΩ internal pullup, and compatibility with +5.0V supply rail supervision in white goods and networking equipment.
Technical Context
The MAX6706LKA+ implements a dual-comparator architecture: one fixed-threshold monitor for VCC (4.63V nominal) and a separate 0.62V reference comparator for external power-fail warning via PFI/PFO. Its reset generator guarantees valid output down to VCC = 1V and includes immunity to short falling-VCC transients.
The watchdog circuit monitors WDI activity with a 1.6s timeout period and asserts WDO independently of RESET; WDO deasserts on valid WDI edge or MR low assertion in A-version configuration. The device uses BiCMOS process technology and supports operation across –40°C to +125°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Reset Threshold | 4.63V (L-suffix), ±3% tolerance over –40°C to +125°C - ensures reliable reset assertion at standard +5V rail dropout |
| Reset Timeout Period | 140ms minimum - holds µP in reset long enough for stable clock and supply settling after power-up |
| Power-Fail Threshold | 0.62V typical at PFI pin - enables precise early-warning detection of secondary supply collapse using external resistor divider |
| Watchdog Timeout | 1.6s typical - provides sufficient window for firmware watchdog servicing without false triggers |
| Supply Current | 12µA typical at VCC < 5.5V - enables ultra-low-power supervision in battery-backed or energy-sensitive systems |
| Operating Voltage Range | 1.0V to 5.5V - guarantees functional reset assertion even during deep brownout conditions |
| Output Type | Active-high push-pull RESET, open-drain WDO and PFO - eliminates need for external pullups on critical reset lines |
Pinout & Package
MAX6706LKA+ is housed in an 8-pin SOT23 package (package code K8+2), measuring 2.9mm × 1.6mm × 1.1mm, with gull-wing leads and RoHS-compliant lead-free finish (+T suffix).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 MR | Active-low manual reset input | CMOS-compatible input with 50kΩ internal pullup to VCC; forces reset when pulled low; used for pushbutton or logic-triggered system reset |
| 2 VCC | Main supply input | Primary power source for IC operation and reset threshold monitoring; powers push-pull outputs |
| 3 GND | Ground reference | Common return path for all internal circuits and output drivers |
| 4 PFI | Power-fail input | High-impedance comparator input referenced to 0.62V internal bandgap; accepts external voltage divider for custom trip point |
| 5 PFO | Power-fail output | Open-drain active-low output asserting when PFI < 0.62V; used to interrupt µP before main supply collapse |
| 6 WDI | Watchdog input | Edge-sensitive input requiring toggle within 1.6s; rising/falling edges clear internal watchdog timer |
| 7 RESET | Active-high reset output | Push-pull output driven high during reset condition; compatible with µP active-high reset inputs without external components |
| 8 WDO | Watchdog output | Open-drain active-low output asserted on watchdog timeout or undervoltage; independent of RESET state |
Key Features
| Feature | Design Value |
|---|---|
| Guaranteed reset validity to VCC = 1V | Ensures deterministic reset behavior during deep brownout, preventing µP runaway before full power loss |
| 140ms reset timeout delay | Provides sufficient hold time for oscillator startup and memory initialization in microcontroller-based systems |
| Independent PFI/PFO comparator | Enables early power-fail warning on auxiliary rails (e.g., 3.3V I/O or 1.8V core) without affecting primary reset timing |
| 1.6s watchdog timeout period | Matches typical firmware service intervals while minimizing risk of spurious resets due to transient noise |
| Active-high push-pull RESET output | Directly interfaces with µPs requiring active-high reset (e.g., many ARM Cortex-M and PIC32 devices) without level-shifting |
Applications
| Industrial Controllers | Telecom Power Management |
|---|---|
|
Use Scenario: Supervising +5V main supply and +3.3V I/O rail in programmable logic controller (PLC) backplane modules. IC Role / Device Role / Timing Role: Primary reset supervisor generating active-high RESET signal synchronized to VCC stability and providing PFO-driven orderly shutdown sequence. Use Value: Prevents corrupted firmware execution during AC line sags by holding µP in reset until both supplies exceed 4.63V and 2.93V thresholds respectively. |
Use Scenario: Monitoring DC-DC converter output in LTE base station remote radio units exposed to wide temperature swings. IC Role / Device Role / Timing Role: Dual-role supervisor: VCC monitor for main 5V rail and PFI-based early warning for 12V bias supply degradation. Use Value: Triggers PFO interrupt 200ms before 12V rail collapse, enabling graceful RF amplifier shutdown and status logging before power loss. |
| White Goods Control Boards | Networking Equipment |
|
Use Scenario: Ensuring safe startup and fault recovery in washing machine motor control boards with variable-speed inverter drives. IC Role / Device Role / Timing Role: System-level power integrity guardian: asserts RESET on VCC brownout and generates watchdog timeout if MCU fails to service WDI during spin cycle. Use Value: Eliminates risk of uncontrolled motor activation by guaranteeing reset remains asserted until VCC stabilizes above 4.63V for ≥140ms post-power-up. |
Use Scenario: Supervising PoE-powered switch ASICs where 5V auxiliary supply must remain stable during data transmission bursts. IC Role / Device Role / Timing Role: High-reliability reset generator with manual reset (MR) support for field-service firmware updates and watchdog-enforced software health checks. Use Value: Enables hot firmware reload via MR pin without requiring full power cycle, reducing network downtime during maintenance windows. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6706AKA+ | A-version with nonlatching WDO behavior: deasserts immediately when undervoltage ends; standard version latches until WDI toggle | Suitable for systems requiring immediate watchdog recovery after transient supply dip, not sustained brownout | Select MAX6706AKA+ only if fast WDO recovery is required; otherwise MAX6706LKA+ provides more robust fault-hold behavior |
| TPS3808G33DBVR | TI part with 3.3V fixed reset threshold, 200ms timeout, no PFI/PFO, no watchdog - lacks power-fail warning and watchdog functions | Applicable only for basic +3.3V rail supervision without early warning or watchdog capability | Choose TPS3808G33DBVR only when power-fail monitoring and watchdog are unnecessary; MAX6706LKA+ offers full feature set in same SOT23 footprint |
Compared with MAX6706AKA+, MAX6706LKA+ provides stronger fault containment via latched WDO during undervoltage events; compared with TPS3808G33DBVR, it delivers integrated power-fail warning and watchdog - critical for systems requiring predictive failure handling and firmware health monitoring.
Availability
MAX6706LKA+ is available at Aetrix Electronics and suitable for industrial controllers, telecom power management, white goods, and networking equipment requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6706LKA+ 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 demanding industrial, automotive, and communications applications.
The MAX6701–MAX6708 family was engineered specifically for multivoltage microprocessor supervision in harsh environments, combining reset, watchdog, and power-fail functions in minimal SOT23 footprint.
FAQ
What is the reset threshold voltage for MAX6706LKA+?
The MAX6706LKA+ has a nominal VCC reset threshold of 4.63V (L-suffix), with ±3% tolerance over –40°C to +125°C. This value is factory-trimmed and specified in the Electrical Characteristics table under "VCC Reset Threshold" for MAX670_L/MAX670_AL versions. It ensures reliable reset assertion when a +5.0V supply drops below 4.47V at maximum operating temperature.
Does MAX6706LKA+ support active-high reset output?
Yes, MAX6706LKA+ features an active-high push-pull RESET output, as confirmed in the Pin Description and Selector Guide tables. This distinguishes it from MAX6706LKA+'s sibling MAX6705LKA+ (active-low) and makes it directly compatible with microprocessors requiring high-true reset signaling without external inverters or pullup resistors.
What is the function of the PFI and PFO pins on MAX6706LKA+?
On MAX6706LKA+, PFI is a high-impedance input referenced to an internal 0.62V bandgap, used with an external resistor divider to detect voltage collapse on auxiliary rails. PFO is its corresponding open-drain active-low output that asserts when PFI falls below 0.62V - enabling early power-fail warning and controlled system shutdown before main supply failure.
How does the watchdog timer operate in MAX6706LKA+?
The MAX6706LKA+ watchdog timer requires a WDI edge (rising or falling) at least every 1.6s (typical). If missed, WDO asserts low and remains latched until cleared by a valid WDI transition or MR low pulse. Unlike MAX6704, it does not trigger RESET - WDO operates independently to feed NMI or other fault-handling logic without resetting the entire system.
Is MAX6706LKA+ compatible with 3.3V supply rails?
No, MAX6706LKA+ is specifically configured for +5.0V supervision with its 4.63V reset threshold. For 3.3V systems, use MAX6706TMA+ (3.08V threshold) or MAX6706SMA+ (2.93V threshold). Using MAX6706LKA+ on 3.3V would cause immediate, permanent reset assertion since VCC never exceeds its 4.47V minimum threshold.
MAX6706LKA+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SOT-23-8
- Packaging:
- Tube
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Multi-Voltage Supervisor
- Number of Voltages Monitored:
- 2
- Voltage - Threshold:
- 4.63V, 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
MAX6706LKA+ FAQ
1.How can I place an order for MAX6706LKA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6706LKA+ 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 MAX6706LKA+ reliable?
The price and inventory of MAX6706LKA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6706LKA+ is usually 5 days.
3.What payment methods are accepted for MAX6706LKA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6706LKA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6706LKA+?
MAX6706LKA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6706LKA+ 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 MAX6706LKA+?
For technical support, including MAX6706LKA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6706LKA+ requirements.
6.How does Aetrix verify that MAX6706LKA+ is sourced from the original manufacturer or authorized distributors?
All MAX6706LKA+ 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 MAX6706LKA+ meets industry standards.
7.What is the process for return or replacement of MAX6706LKA+?
All MAX6706LKA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6706LKA+, 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 MAX6706LKA+ part is unused and in its original packaging.
Return procedure for MAX6706LKA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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