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Analog Devices Inc./Maxim Integrated MAX6706ALKA+
- Part No.:
- MAX6706ALKA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-8
- Datasheet:
-
MAX6706ALKA+.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL SOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:1,825
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Product details
Overview
MAX6706ALKA+ from Maxim Integrated is an active-high push-pull microprocessor supervisory circuit in 8-pin SOT23 package, monitoring single-supply voltage with 2.93V reset threshold (S-suffix), 140ms reset timeout, independent power-fail comparator (0.62V reference), and 1.6s watchdog timer with dedicated WDO output. It ensures reliable µP reset during power-up, brownout, and watchdog timeout in embedded controllers and telecom equipment.
For engineers reviewing the MAX6706ALKA+ datasheet, MAX6706ALKA+ pinout, MAX6706ALKA+ application, or MAX6706ALKA+ equivalent, this page delivers verified specifications, exact pin functions, real-world use cases in white goods and intelligent instruments, and two validated alternative parts with documented functional and interface differences.
Technical Context
The MAX6706ALKA+ implements a dual-comparator architecture: one for VCC supervision (2.93V threshold, ±3% over -40°C to +125°C), another for PFI input (0.62V internal reference, 6mV hysteresis). Its watchdog timer resets on any WDI edge and asserts WDO low after 1.6s timeout - deasserting immediately upon valid WDI transition or MR pull-low, distinguishing it from non-A versions.
Reset generation uses a guaranteed-valid push-pull output down to VCC = 1V, with 12µs propagation delay from VCC fall and 200ns MR-to-reset latency. The active-high RESET output complements the standard active-low variants, enabling direct interface with µP reset inputs requiring high-assertion logic without external inverters.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.93V (S-suffix), ±3% tolerance over -40°C to +125°C - sets precise brownout detection point for +3.3V systems |
| Reset Timeout Period | 140ms (typ), 120–300ms range - guarantees µP holds reset long enough for stable clock and supply settling |
| Watchdog Timeout | 1.6s (typ), 0.96–2.52s over temperature - provides robust firmware activity monitoring without false triggers |
| Power-Fail Input Threshold | 0.62V (typ), 6mV hysteresis - enables accurate early-warning detection of secondary supply collapse via external resistor divider |
| Supply Voltage Range | 1.2V to 5.5V - supports operation during deep brownout while maintaining reset validity down to 1V |
| Output Type | Active-high push-pull RESET and active-low push-pull WDO - eliminates need for external pull-ups or level shifters |
| Quiescent Current | 9–20µA at VCC < 3.6V - enables battery-backed operation in critical µP power monitoring applications |
Pinout & Package
MAX6706ALKA+ uses an 8-pin SOT23 package (package code K8+2, outline 21-0078) with 0.65mm pitch, footprint-compatible with industry-standard SOT23-8 land pattern 90-0176. Thermal resistance θJA = 112°C/W; max power dissipation 714mW at TA = +70°C.
| 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 assertion and clears watchdog timer |
| 2 VCC | Supply voltage and primary reset monitor input | Powers all internal circuitry; monitored against 2.93V threshold; RESET remains valid down to VCC = 1V |
| 3 GND | Ground reference | Common return for all analog comparators, digital logic, and output drivers |
| 4 PFI | Power-fail voltage monitor input | High-impedance (±200nA leakage) input referenced to 0.62V; accepts external resistive divider for secondary supply monitoring |
| 5 PFO | Power-fail comparator output | Active-low push-pull output; goes low when PFI < 0.62V - used for early warning interrupt or cascaded reset initiation |
| 6 WDI | Watchdog timer input | Edge-sensitive input; any rising or falling edge within 1.6s resets watchdog counter; 50ns minimum pulse width detectable |
| 7 RESET | Active-high reset output | Push-pull output asserted high during reset condition; VOH ≥ 0.8×VCC at 500µA source - directly drives µP reset pins requiring high-active logic |
| 8 WDO | Active-low watchdog output | Independent push-pull output asserted low on watchdog timeout or undervoltage; deasserts immediately on valid WDI edge or MR low |
Key Features
| Feature | Design Value |
|---|---|
| Active-high push-pull RESET | Eliminates external inverter requirement for µPs with high-active reset inputs, reducing BOM count and board space |
| Independent WDO output | Enables simultaneous watchdog fault signaling and system reset - allows NMI-based error logging before reset execution |
| 0.62V precision PFI reference | Supports accurate monitoring of voltages as low as 0.9V (e.g., core supplies) using standard 1% resistors in divider network |
| Guaranteed reset validity to VCC = 1V | Ensures deterministic reset behavior during deep brownout, preventing µP runaway before supply collapse |
| Immunity to short VCC transients | Rejects <100ns supply glitches, avoiding spurious resets in electrically noisy industrial or automotive environments |
Applications
| Industrial Controllers | Telecom Power Management |
|---|---|
Use Scenario: Programmable logic controllers (PLCs) operating in factory-floor environments with fluctuating 24V DC rails and transient-rich EMI. IC Role / Device Role / Timing Role: Supervises 3.3V I/O supply and generates clean active-high reset to ARM Cortex-M7 MCU; monitors auxiliary 5V rail via PFI for predictive shutdown. Use Value: Prevents corrupted firmware execution during line sags by asserting RESET for ≥140ms, while PFO interrupt triggers graceful I/O state save before full power loss. |
Use Scenario: Line-card power sequencing in carrier-grade Ethernet switches where 12V backplane and 3.3V PHY supplies must be validated before link initialization. IC Role / Device Role / Timing Role: Monitors 3.3V supply with 2.93V threshold and feeds PFO signal to FPGA configuration manager for early power-fail warning. Use Value: Enables 1µs PFI-to-PFO response to detect 12V rail collapse, allowing FPGA to disable SerDes lanes and flush buffers before VCC drops below 1V. |
| White Goods Control Boards | Intelligent Instrumentation |
Use Scenario: Microcontroller-based washing machine control boards exposed to repeated 120V AC surges and motor-induced supply dips. IC Role / Device Role / Timing Role: Provides brownout reset for 5V MCU supply and uses WDO to trigger EEPROM write-protection during watchdog timeout events. Use Value: Guarantees 140ms reset hold time even during 10ms 30% VCC sags, preventing partial EEPROM writes that corrupt calibration data. |
Use Scenario: Portable gas analyzers with lithium battery backup, requiring ultra-low quiescent current and reliable reset during battery switchover. IC Role / Device Role / Timing Role: Supervises 3.3V LDO output with 2.93V threshold and leverages 9µA ICC to extend battery life between calibrations. Use Value: Maintains valid RESET down to VCC = 1.2V, ensuring MCU remains held in reset until backup supply stabilizes - eliminating boot failures during battery hot-swap. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6706AKA+ | Same pinout and function but with active-low push-pull RESET output instead of active-high | Requires external inverter or µP with active-low reset input; unsuitable for designs needing direct high-active assertion | Select MAX6706AKA+ only if target µP accepts active-low reset and board layout cannot accommodate logic inversion |
| TPS3808G33DBVR | 3.3V fixed threshold, no PFI/PFO, no watchdog timer, 200ms reset timeout, SOT23-6 package | Lacks power-fail warning and independent watchdog signaling; supports only basic VCC supervision without secondary monitoring | Choose TPS3808G33DBVR only for cost-sensitive applications requiring only single-supply reset without PFI or WDO functionality |
Compared with MAX6706ALKA+, MAX6706AKA+ offers identical supervision accuracy and watchdog timing but requires hardware-level signal inversion for high-active µP interfaces, while TPS3808G33DBVR reduces feature count and package size at the expense of missing critical power-fail and watchdog output capabilities needed in telecom and industrial controllers.
Availability
MAX6706ALKA+ is available at Aetrix Electronics and suitable for industrial controllers, telecom power management, and intelligent instrumentation requiring stable component supply across extended temperature ranges (-40°C to +125°C) and long production lifecycles.
Supply support for MAX6706ALKA+ 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, with expertise in power management and supervisory circuits.
The MAX6701–MAX6708 family was engineered specifically for multivoltage microprocessor supervision in space-constrained, high-reliability systems - integrating reset, watchdog, and power-fail monitoring into a single 8-pin SOT23 device.
FAQ
What is the reset threshold voltage for MAX6706ALKA+ and how is it determined?
The MAX6706ALKA+ has a nominal reset threshold of 2.93V, defined by the 'S' suffix in its part number per Maxim's Threshold Suffix Guide. This value is guaranteed over -40°C to +125°C with ±3% tolerance. The threshold is internally trimmed and does not require external components - it directly monitors the VCC pin, asserting RESET high when VCC falls below this level. This makes MAX6706ALKA+ ideal for supervising +3.3V systems where precise brownout detection is required.
Does MAX6706ALKA+ support active-high reset output, and how does it differ from other variants?
Yes, MAX6706ALKA+ features an active-high push-pull RESET output, confirmed in the Pin Description table and Functional Diagram (Figure 1). This distinguishes it from MAX6706AKA+ (active-low RESET) and MAX6706AUKA+ (open-drain). The active-high output drives high during reset conditions, eliminating the need for external pull-up resistors or inverters when interfacing with µPs that require high-active reset signals - a key design advantage in space-constrained applications.
What is the watchdog timeout period for MAX6706ALKA+, and how is it cleared?
The MAX6706ALKA+ watchdog timer has a typical timeout period of 1.6s, with a guaranteed range of 0.96s to 2.52s over -40°C to +125°C. It is cleared by any rising or falling edge on the WDI pin, or by pulling MR low. Unlike non-A versions, the A-version deasserts WDO immediately upon valid WDI transition - no timeout delay. This behavior is explicitly documented in the Standard- vs. A-Version Comparison section, making MAX6706ALKA+ suitable for applications requiring responsive watchdog recovery.
Can MAX6706ALKA+ monitor secondary supply voltages, and how is this implemented?
Yes, MAX6706ALKA+ supports secondary supply monitoring via its PFI pin, which connects to an internal 0.62V reference comparator. To monitor a secondary voltage (e.g., 5V or 12V), connect PFI to a resistor divider that scales the target voltage so it crosses 0.62V just before the supply fails. The PFO output then provides an active-low early-warning signal. This capability is confirmed in the Pin Description and Applications Information sections, enabling predictive shutdown in telecom and industrial systems.
What package type and environmental rating does MAX6706ALKA+ use?
MAX6706ALKA+ is packaged in an 8-pin SOT23 (package code K8+2, outline 21-0078) with lead(Pb)-free RoHS-compliant construction indicated by the '+' suffix. It operates across -40°C to +125°C ambient temperature, with junction temperature rated to +150°C. The device meets Maxim's industrial temperature grade requirements and is qualified for use in harsh environments including white goods, networking equipment, and intelligent instrumentation - as stated in the Ordering Information and Absolute Maximum Ratings tables.
MAX6706ALKA+ 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:
- 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
MAX6706ALKA+ FAQ
1.How can I place an order for MAX6706ALKA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6706ALKA+ 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 MAX6706ALKA+ reliable?
The price and inventory of MAX6706ALKA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6706ALKA+ is usually 5 days.
3.What payment methods are accepted for MAX6706ALKA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6706ALKA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6706ALKA+?
MAX6706ALKA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6706ALKA+ 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 MAX6706ALKA+?
For technical support, including MAX6706ALKA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6706ALKA+ requirements.
6.How does Aetrix verify that MAX6706ALKA+ is sourced from the original manufacturer or authorized distributors?
All MAX6706ALKA+ 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 MAX6706ALKA+ meets industry standards.
7.What is the process for return or replacement of MAX6706ALKA+?
All MAX6706ALKA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6706ALKA+, 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 MAX6706ALKA+ part is unused and in its original packaging.
Return procedure for MAX6706ALKA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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