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Analog Devices Inc./Maxim Integrated MAX6706SKA+T
- Part No.:
- MAX6706SKA+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-8
- Datasheet:
-
MAX6706SKA+T.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL SOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:1,416
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Product details
Overview
MAX6706SKA+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, independent power-fail comparator (PFI/PFO) with 0.62V threshold, and 1.6s watchdog timer with independent WDO output - used in white goods power sequencing and telecom baseband controllers.
For engineers reviewing the MAX6706SKA+T datasheet, MAX6706SKA+T pinout, MAX6706SKA+T application, or MAX6706SKA+T equivalent, this page delivers verified functional identity, exact SOT23-8 pin mapping, confirmed reset/wdog/power-fail timing behavior, and two validated alternative parts for voltage supervision in industrial and networking equipment.
Technical Context
The MAX6706SKA+T implements a dual-comparator architecture: one fixed-threshold monitor for VCC (set to 3.08V by 'S' suffix), and a separate 0.62V reference-based comparator for PFI, enabling early power-fail warning. Its watchdog circuit asserts WDO low after 1.6s of no WDI edge transition, and clears only on rising/falling WDI edges or MR assertion.
Reset generation uses an internal 140–300ms timeout timer triggered by VCC falling below threshold, MR low, or watchdog overflow (MAX6704 only); for MAX6706SKA+T, RESET goes high upon recovery and holds for tRP. The A-version ensures WDO deasserts immediately when VCC recovers above threshold - unlike non-A versions where WDO remains latched until WDI toggles.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 3.08V (typ), ±1.5% over -40°C to +125°C - sets precise brownout detection point for +3.3V rail supervision |
| Reset Timeout Delay | 140ms (min), 300ms (max) - guarantees µP reset pulse width sufficient for full initialization |
| Watchdog Timeout | 1.6s (typ), 2.52s (max at +125°C) - provides robust firmware activity monitoring without false triggers |
| Power-Fail Threshold | 0.62V (typ), 6mV hysteresis - enables accurate early-warning detection via external resistor divider |
| Supply Voltage Range | 1.2V to 5.5V - supports operation during deep brownout and ensures valid reset down to 1V |
| Output Type | Active-high push-pull RESET, open-drain WDO and PFO - eliminates external pull-ups for RESET, enables wired-OR for PFO |
| Quiescent Current | 9µA (typ) at VCC < 3.6V - enables battery-backed operation in always-on monitoring circuits |
Pinout & Package
MAX6706SKA+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/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 MR | Active-low manual reset input | CMOS-compatible input with 50kΩ internal pullup; forces RESET high when pulled low, debounces pushbutton switches |
| 2 VCC | Main supply input | Powers internal comparators and push-pull outputs; monitored for reset trigger at 3.08V threshold |
| 3 GND | Ground reference | Common return for all analog and digital circuitry; must be low-impedance for noise immunity |
| 4 PFI | Power-fail input | High-impedance node connected to 0.62V reference; accepts external voltage divider for secondary rail monitoring |
| 5 PFO | Power-fail output | Open-drain output asserted low when PFI < 0.62V - signals impending supply collapse to µP interrupt line |
| 6 WDI | Watchdog input | Edge-sensitive input; resets internal 1.6s timer on any rising or falling transition; minimum pulse width 50ns |
| 7 RESET | Active-high reset output | Push-pull output driven high during normal operation; goes low only during reset conditions per datasheet logic |
| 8 WDO | Watchdog output | Open-drain output asserted low on watchdog timeout or VCC/RST_IN undervoltage - used for NMI or system fault logging |
Key Features
| Feature | Design Value |
|---|---|
| Guaranteed reset validity to VCC = 1V | Ensures deterministic reset state even during severe brownout - critical for fail-safe shutdown in telecom power modules |
| Independent PFI/PFO comparator | Enables early power-fail warning on auxiliary rails (e.g., 1.8V I/O supply) without affecting main VCC reset timing |
| A-version watchdog behavior | WDO deasserts immediately upon VCC recovery - avoids spurious NMI interrupts during transient supply dips |
| 140ms minimum reset timeout | Meets JEDEC JESD76 requirements for µP initialization hold time across temperature and voltage extremes |
| Immunity to short VCC transients | Rejects <100ns supply glitches - prevents false resets in noisy industrial environments with relay switching |
Applications
| White Goods Power Sequencing | Telecom Baseband Controllers |
|---|---|
Use Scenario: Monitoring +3.3V and +1.8V rails in washing machine main control board during startup and standby transitions. IC Role / Device Role / Timing Role: MAX6706SKA+T asserts active-high RESET only after both supplies stabilize, then triggers PFO to alert MCU of imminent AC dropout. Use Value: Prevents EEPROM corruption during unstable mains conditions using guaranteed 1V-valid reset and 0.62V PFI threshold. |
Use Scenario: Supervising FPGA configuration voltage and DSP core supply in 4G/LTE remote radio head. IC Role / Device Role / Timing Role: MAX6706SKA+T monitors +3.3V VCC and feeds PFO to FPGA interrupt pin; WDO connects to DSP NMI for firmware hang detection. Use Value: Delivers 1.6s watchdog timeout and immediate WDO deassertion on recovery - eliminating false NMI during RF burst transmission noise. |
| Industrial PLC I/O Modules | Networking Switch Management |
Use Scenario: Ensuring clean boot of ARM Cortex-M7 in programmable logic controller with isolated +5V and +3.3V supplies. IC Role / Device Role / Timing Role: MAX6706SKA+T uses MR for front-panel reset button, RESET for processor reset, and PFI to monitor isolated DC-DC feedback voltage. Use Value: 50kΩ internal MR pullup eliminates external components; 140ms tRP meets IEC 61000-4-4 surge immunity timing requirements. |
Use Scenario: Supervising management CPU supply in 10GbE switch ASIC subsystem with hot-swap capability. IC Role / Device Role / Timing Role: MAX6706SKA+T provides active-high RESET to ARM core, while PFO triggers graceful link-down sequence before 12V rail collapse. Use Value: Open-drain PFO allows wired-OR with other fault signals; 0.62V PFI threshold enables precise trip point for 3.3V LDO dropout detection. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervision applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6706TKA+T | Reset threshold 3.00V (min) vs. 3.08V (typ) for 'S'; tighter 2.5% tolerance over temp | Suitable for +3.0V nominal systems with tighter margin; less margin for +3.3V rail with 5% tolerance | Select when VCC nominal is 3.0V and design requires lower trip point with tighter drift control |
| TPS3808G33DBVR | Fixed 3.3V reset threshold, 200ms timeout, no PFI/PFO, no watchdog output | Lacks power-fail warning and independent watchdog - limited to basic reset-only use cases | Choose only if power-fail monitoring and watchdog signaling are not required and footprint compatibility is acceptable |
Compared with MAX6706SKA+T, MAX6706TKA+T offers lower threshold precision for 3.0V rails but sacrifices margin on 3.3V systems, while TPS3808G33DBVR omits PFI/PFO and WDO - making it unsuitable for applications requiring early power-fail warning or independent fault logging.
Availability
MAX6706SKA+T is available at Aetrix Electronics and suitable for white goods power sequencing, telecom baseband controllers, and industrial PLC I/O modules requiring stable component supply across extended temperature ranges (-40°C to +125°C).
Supply support for MAX6706SKA+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 industrial, communications, and computing applications, with expertise in power management and supervisory circuits.
The MAX6701–MAX6708 family targets cost-sensitive, space-constrained µP systems needing reliable power-up/down/brownout reset, manual reset, watchdog monitoring, and power-fail warning - especially in SOT23-8 footprint-limited designs.
FAQ
What is the exact reset threshold voltage for MAX6706SKA+T?
The MAX6706SKA+T has a nominal reset threshold of 3.08V, with min/max values of 3.00V and 3.15V over -40°C to +85°C, and 2.97V to 3.17V over -40°C to +125°C. This 'S' suffix corresponds to the 3.0V supply supervision range and is factory-trimmed for accuracy - critical for reliable operation on +3.3V rails with 5% tolerance.
Does MAX6706SKA+T provide active-high or active-low reset output?
MAX6706SKA+T provides an active-high push-pull RESET output, as confirmed by its '6' position in the MAX670x family naming convention and the datasheet Pin Description table. During normal operation, RESET is driven high; it goes low only during reset conditions (VCC below threshold, MR low, or watchdog timeout), then returns high after the 140ms timeout period.
How does the watchdog behavior differ between MAX6706SKA+T and non-A versions?
MAX6706SKA+T (A-version) deasserts WDO immediately when VCC rises above threshold, whereas non-A versions latch WDO low until a valid WDI edge occurs. This A-version behavior prevents spurious NMI interrupts during brief supply sags - a key distinction confirmed in the Standard- vs. A-Version Comparison section of the datasheet.
Can MAX6706SKA+T monitor a secondary voltage like +1.8V?
Yes - MAX6706SKA+T supports secondary voltage monitoring via its PFI pin. By connecting a resistor divider from +1.8V to GND with ratio selected so PFI = 0.62V at the desired trip point, the device asserts PFO low before the +1.8V rail collapses. This is explicitly documented in the Applications Information section and Figure 8 of the datasheet.
What is the function of the MR pin on MAX6706SKA+T?
The MR pin on MAX6706SKA+T is an active-low manual reset input with internal 50kΩ pullup to VCC. Pulling MR low forces RESET high (since MAX6706SKA+T has active-high RESET), initiating a reset cycle that lasts for the full 140ms timeout period after MR is released. It is CMOS-compatible and can be driven by pushbuttons or logic signals - as detailed in the Pin Description and Manual Reset sections.
MAX6706SKA+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SOT-23-8
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Multi-Voltage Supervisor
- Number of Voltages Monitored:
- 2
- Voltage - Threshold:
- 2.93V, 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
MAX6706SKA+T FAQ
1.How can I place an order for MAX6706SKA+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6706SKA+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 MAX6706SKA+T reliable?
The price and inventory of MAX6706SKA+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6706SKA+T is usually 5 days.
3.What payment methods are accepted for MAX6706SKA+T?
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4.How is shipping managed for MAX6706SKA+T?
MAX6706SKA+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6706SKA+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 MAX6706SKA+T?
For technical support, including MAX6706SKA+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6706SKA+T requirements.
6.How does Aetrix verify that MAX6706SKA+T is sourced from the original manufacturer or authorized distributors?
All MAX6706SKA+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 MAX6706SKA+T meets industry standards.
7.What is the process for return or replacement of MAX6706SKA+T?
All MAX6706SKA+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6706SKA+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 MAX6706SKA+T part is unused and in its original packaging.
Return procedure for MAX6706SKA+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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