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Analog Devices Inc./Maxim Integrated MAX6706MKA
- Part No.:
- MAX6706MKA
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-8
- Datasheet:
-
MAX6706MKA.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL SOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:1,293
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Product details
Overview
MAX6706MKA from Maxim Integrated is an active-high push-pull microprocessor supervisory IC in 8-pin SOT23 package, monitoring single-supply voltage with 4.38V reset threshold (M-suffix), 140ms reset timeout, independent watchdog output (WDO), and 0.62V power-fail comparator input (PFI). It ensures reliable µP reset during power-up, brownout, and manual intervention in industrial controllers and embedded systems.
For engineers reviewing the MAX6706MKA datasheet, MAX6706MKA pinout, MAX6706MKA application, or MAX6706MKA equivalent, key selection criteria include active-high reset polarity, guaranteed reset validity down to VCC = 1V, 1.6s watchdog timeout, and compatibility with +3.3V/+5V supply rails in space-constrained designs.
Technical Context
The MAX6706MKA implements a precision voltage monitor with fixed 4.38V VCC reset threshold and independent 0.62V reference for PFI-based power-fail detection. Its internal watchdog timer asserts WDO low after 1.6s of no WDI transition, and deasserts immediately upon valid edge detection or MR pull-low - unlike non-A versions which latch WDO until WDI toggle.
Reset generation uses a 140ms timeout after VCC, PFI, or MR assertion, with active-high push-pull RESET output guaranteed functional down to VCC = 1V. The device supports manual reset via internal 50kΩ pullup on MR and operates across –40°C to +125°C with supply current as low as 9µA at 3.3V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.38V (M-suffix), ±3% over –40°C to +125°C - sets precise brownout detection point for +3.3V systems |
| Reset Timeout | 140ms (typ), 120–300ms range - ensures µP remains held in reset long enough for stable clock and supply settling |
| Watchdog Timeout | 1.6s (typ), 0.96–2.52s range - provides robust software activity monitoring without false triggers from transient noise |
| Power-Fail Input Threshold | 0.62V (typ), 6mV hysteresis - enables accurate early-warning detection of secondary supply collapse using external resistor divider |
| Supply Voltage Range | 1.2V to 5.5V - supports operation during deep brownout while maintaining reset assertion integrity |
| Output Type | Active-high push-pull RESET, open-drain WDO - eliminates need for external pullup on RESET; allows direct NMI connection via WDO |
| Operating Temperature | –40°C to +125°C - qualified for under-hood automotive, industrial motor control, and telecom infrastructure environments |
Pinout & Package
Package: 8-pin SOT23-8 (3.00mm × 1.75mm × 1.30mm body, 0.65mm pitch), lead-free option available as MAX6706MKA+T.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 MR | Manual Reset Input | CMOS-compatible active-low input with internal 50kΩ pullup to VCC; forces reset when pulled low, also clears watchdog timer |
| 2 VCC | Supply Voltage Input | Primary power rail input (1.2–5.5V); powers internal comparators, timers, and push-pull outputs; reset asserted when falling below 4.38V |
| 3 GND | Ground Reference | System ground return for all internal circuits and output drivers; must be low-impedance for accurate threshold sensing |
| 4 PFI | Power-Fail Input | High-impedance comparator input referenced to 0.62V internal bandgap; used with external divider to monitor auxiliary supplies |
| 5 PFO | Power-Fail Output | Open-drain active-low output asserting when PFI < 0.62V; connects directly to µP interrupt or MR for cascaded reset |
| 6 WDI | Watchdog Input | Edge-sensitive input requiring ≥50ns pulse width; toggling within 1.6s prevents WDO assertion; resets watchdog timer on any edge |
| 7 RESET | Active-High Reset Output | Push-pull output driven high during normal operation; goes low only during reset conditions - inverse behavior vs. MAX6705MKA |
| 8 WDO | Watchdog Output | Open-drain active-low output asserting on watchdog timeout or undervoltage; deasserts immediately on MR low or WDI edge (A-version) |
Key Features
| Feature | Design Value |
|---|---|
| Active-High Push-Pull RESET | Eliminates external pullup resistor, reduces BOM count, and ensures deterministic logic level during full VCC range (1.2–5.5V) |
| Independent Watchdog Output (WDO) | Provides dedicated NMI-capable fault signal separate from reset, enabling software recovery without full system reboot |
| 0.62V Precision Power-Fail Comparator | Enables accurate early-warning detection of secondary supply collapse using high-value resistive dividers (nA input leakage) |
| Guaranteed Reset Validity to VCC = 1V | Ensures µP remains held in reset even during deep brownout, preventing erratic execution before supply recovery |
| –40°C to +125°C Operating Range | Qualified for harsh environments including automotive engine control units and industrial PLCs without derating |
Applications
| Industrial Motor Control | Automotive Body Control Module |
|---|---|
Use Scenario: Monitoring main 5V supply and 3.3V I/O rail in programmable logic controller with real-time safety shutdown. IC Role / Device Role / Timing Role: Dual-voltage supervision via VCC and PFI inputs; generates active-high RESET to hold MCU in safe state during undervoltage; asserts WDO to trigger NMI-based diagnostics. Use Value: Prevents spurious motion commands during brownout by guaranteeing 140ms reset hold time and validating reset down to VCC = 1V. | Use Scenario: Supervising battery-backed 3.3V microcontroller in door module exposed to load-dump transients and cold-crank conditions. IC Role / Device Role / Timing Role: Primary reset generator with 4.38V threshold aligned to 3.3V regulator dropout; uses MR for ignition-switch-triggered initialization; WDO monitors firmware liveness. Use Value: Immunity to short VCC transients (<100ns) avoids false resets during alternator switching, while 125°C rating ensures reliability under hood. |
| Telecom Line Card | White Goods Main Controller |
Use Scenario: Ensuring clean boot sequence for DSP and FPGA on carrier-grade line card with dual 3.3V/1.2V supplies. IC Role / Device Role / Timing Role: Single-supply supervision of 3.3V rail; PFI monitors 1.2V core supply via resistor divider; PFO interrupts processor before power loss. Use Value: 0.62V PFI threshold enables accurate 1.2V monitoring with <1% error; 140ms timeout accommodates slow-start DC-DC converters. | Use Scenario: Reset management for washing machine mainboard operating from rectified AC with wide input variation. IC Role / Device Role / Timing Role: Monitors unregulated 5V rail derived from bridge rectifier; MR connected to user interface button; WDO tied to MR for watchdog-initiated soft reset. Use Value: Active-high RESET simplifies interface with legacy MCU reset pins; 1.6s watchdog timeout balances responsiveness and noise immunity in noisy appliance EMI environment. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6702MKA | Same 4.38V threshold and active-high RESET, but lacks PFI/PFO power-fail comparator | Not suitable for systems requiring early warning of auxiliary supply failure | Select MAX6702MKA only if power-fail monitoring is unnecessary and board space permits removal of PFI/PFO routing |
| MAX6706AKA | A-version with identical pinout and thresholds, but WDO deasserts immediately on MR low or WDI edge (non-latching) | Better suited for applications requiring fast watchdog recovery without waiting for next WDI toggle | Choose MAX6706AKA when deterministic WDO deassertion timing is critical for NMI-driven fault handling |
Compared with MAX6702MKA, MAX6706MKA adds essential power-fail monitoring capability; compared with MAX6706AKA, it uses standard WDO latching behavior that requires WDI edge to clear - making it preferable where watchdog faults must persist until software explicitly services them.
Availability
MAX6706MKA is available at Aetrix Electronics and suitable for industrial motor control, automotive body electronics, and telecom infrastructure applications requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6706MKA 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 delivers compact, low-power µP supervision with integrated watchdog, power-fail detection, and manual reset - targeting space-constrained embedded systems needing high reliability across extreme temperatures.
FAQ
What is the reset output polarity and drive type of the MAX6706MKA?
The MAX6706MKA features an active-high push-pull RESET output. Unlike open-drain or active-low variants, this configuration drives the output high during normal operation and low only during reset assertion - eliminating the need for an external pullup resistor and ensuring defined logic levels across the full 1.2V–5.5V supply range. This behavior is confirmed in the Pin Description and Selector Guide sections of the MAX6706MKA datasheet.
What voltage threshold does the MAX6706MKA monitor, and how is it selected?
The MAX6706MKA monitors VCC with a fixed 4.38V reset threshold, indicated by the "M" suffix in the part number per the Threshold Suffix Guide. This value is trimmed at production and specified with ±3% tolerance over –40°C to +125°C. No external components are required to set this threshold - it is factory-programmed and applies solely to the VCC pin, not PFI or RST_IN inputs.
Does the MAX6706MKA include a watchdog timer, and what is its timeout period?
Yes, the MAX6706MKA includes a watchdog timer with a nominal timeout period of 1.6 seconds, ranging from 0.96s to 2.52s over temperature. The timer resets on any rising or falling edge at WDI and asserts the open-drain WDO output low upon timeout. WDO deasserts immediately when MR is pulled low or a valid WDI edge occurs - consistent with the A-version architecture described in the Standard- vs. A-Version Comparison section.
How does the power-fail detection function work on the MAX6706MKA?
The MAX6706MKA uses the PFI pin to monitor auxiliary voltages via an external resistor divider, comparing the divided voltage against an internal 0.62V reference. When PFI falls below this threshold, the open-drain PFO output goes low. The 6mV hysteresis prevents chatter near trip point, and nA-level input leakage allows use of high-value resistors - minimizing quiescent current in battery-powered applications using MAX6706MKA.
What is the minimum supply voltage at which the MAX6706MKA guarantees valid reset operation?
The MAX6706MKA guarantees valid reset output behavior down to VCC = 1V, as stated in the Features list and confirmed in the Detailed Description. Below 1V, the RESET output becomes high-impedance, but between 1.2V and 5.5V - its full operating range - RESET maintains specified VOL/VOH performance and timing accuracy. This ensures fail-safe operation during deep brownout events common in automotive and industrial power systems using MAX6706MKA.
MAX6706MKA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SOT-23-8
- Packaging:
- Bulk
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Multi-Voltage Supervisor
- Number of Voltages Monitored:
- 2
- Voltage - Threshold:
- 4.38V, Adj
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active High
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-8
MAX6706MKA FAQ
1.How can I place an order for MAX6706MKA through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6706MKA 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 MAX6706MKA reliable?
The price and inventory of MAX6706MKA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6706MKA is usually 5 days.
3.What payment methods are accepted for MAX6706MKA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6706MKA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6706MKA?
MAX6706MKA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6706MKA 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 MAX6706MKA?
For technical support, including MAX6706MKA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6706MKA requirements.
6.How does Aetrix verify that MAX6706MKA is sourced from the original manufacturer or authorized distributors?
All MAX6706MKA 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 MAX6706MKA meets industry standards.
7.What is the process for return or replacement of MAX6706MKA?
All MAX6706MKA units undergo pre-shipment inspection (PSI). If there is an issue with MAX6706MKA, 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 MAX6706MKA part is unused and in its original packaging.
Return procedure for MAX6706MKA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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