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Analog Devices Inc./Maxim Integrated MAX6706SKA+
- Part No.:
- MAX6706SKA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-8
- Datasheet:
-
MAX6706SKA+.pdf
- Description:
- IC SUPERVISOR MPU LV SOT23-8
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
MAX6706SKA+ 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 during power-up, brownout, and power-down; independent watchdog timeout (1.6s); 0.62V precision power-fail comparator input with active-low push-pull PFO output; manual reset input with internal 50kΩ pullup; and reset timeout delay of 140ms. It is used in critical µP power monitoring for industrial controllers and intelligent instruments.
For engineers reviewing the MAX6706SKA+ datasheet, MAX6706SKA+ pinout, MAX6706SKA+ application, or MAX6706SKA+ equivalent, this page delivers verified functional identity, confirmed SOT23-8 package mapping, validated pin roles, exact reset threshold (2.93V), and two real-world alternative parts with documented technical differences - all extracted from Maxim's official MAX6701–MAX6708 family datasheet (Rev 4, May 2014).
Technical Context
The MAX6706SKA+ implements a dual-comparator architecture: one fixed-threshold monitor on VCC (2.93V nominal) and one independent 0.62V reference-based comparator on PFI for early power-fail warning. Its reset generator asserts active-high RESET for ≥140ms after VCC rises above threshold or MR release, with guaranteed validity down to VCC = 1V.
It integrates a non-disableable watchdog timer with 1.6s timeout (typ), cleared by WDI edge transitions or reset assertion. WDO is an independent active-low push-pull output that latches low on timeout and deasserts only upon valid WDI toggle or MR low - distinguishing it from standard (non-A) versions where WDO remains latched until WDI transition.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold (VCC) | 2.93V (nominal), ±30mV over -40°C to +125°C - sets precise brownout detection point for +3.0V/3.3V systems |
| Reset Timeout Period | 140ms (min), 200ms (typ), 280ms (max) - ensures µP initialization completes before release |
| Watchdog Timeout | 1.6s (typ), 0.96–2.52s over temperature - provides robust firmware activity supervision without false triggers |
| Power-Fail Input Threshold | 0.62V (typ), ±9mV over temp - enables accurate early-warning detection via external resistor divider |
| Supply Current | 9–20µA at VCC < 3.6V - supports ultra-low-power battery-backed or energy-constrained applications |
| Operating Voltage Range | 1.2V to 5.5V - guarantees reset assertion even during deep brownout down to 1.2V |
| Output Type | Active-high push-pull RESET, active-low push-pull WDO and PFO - eliminates need for external pullups or level shifters |
Pinout & Package
MAX6706SKA+ is housed in an 8-pin SOT23 package (package code K8+2, outline 21-0078), optimized for space-constrained PCB layouts and compatible with standard reflow profiles. Pin assignments are fully validated per Maxim's official pin description table (page 5, Rev 4 datasheet).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 MR | Active-low manual reset input | CMOS-compatible input with internal 50kΩ pullup to VCC; pulling low forces active-high RESET assertion for ≥140ms |
| 2 VCC | Main supply and primary reset monitor input | Supplies internal circuitry and serves as reference for 2.93V reset threshold detection |
| 3 GND | Ground reference | Common return path for all analog and digital functions; must be low-impedance for noise immunity |
| 4 PFI | Power-fail comparator input | High-impedance (±200nA leakage) node tied to 0.62V internal reference; accepts external voltage divider for custom trip points |
| 5 PFO | Power-fail output | Active-low push-pull output asserted when PFI < 0.62V; drives µP interrupt or backup controller directly |
| 6 WDI | Watchdog input | Edge-sensitive input; rising or falling edge clears watchdog timer; 50ns minimum pulse width supported |
| 7 RESET | Active-high reset output | Push-pull output asserted high during reset conditions; valid down to VCC = 1V; complements MAX6705/MAX6707 variants |
| 8 WDO | Watchdog output | Active-low push-pull output latched on timeout; deasserts only on WDI edge or MR low - enables NMI-driven fault recovery |
Key Features
| Feature | Design Value |
|---|---|
| Active-high push-pull RESET | Eliminates external pullup resistor and reduces BOM count; compatible with µP reset inputs requiring high-active assertion |
| Independent 0.62V PFI comparator | Enables early power-fail warning for secondary rails (e.g., 1.8V, 2.5V) using simple resistor dividers - no additional ICs needed |
| Guaranteed reset down to VCC = 1V | Ensures deterministic system state during deep undervoltage events, critical for fail-safe shutdown in white goods and telecom |
| 1.6s watchdog with latch-on-timeout | Prevents runaway firmware by forcing recoverable fault condition (WDO low) without resetting µP unless explicitly connected to MR |
| Immunity to short VCC transients | Rejects sub-100ns supply glitches, avoiding spurious resets in noisy industrial environments like motor drives or PLCs |
Applications
| Industrial Controllers | Intelligent Instruments |
|---|---|
Use Scenario: Programmable logic controllers (PLCs) require reliable power sequencing and brownout recovery during factory floor voltage sags. IC Role / Device Role / Timing Role: MAX6706SKA+ monitors main 3.3V rail and auxiliary 2.5V I/O supply via PFI divider, asserting active-high RESET and PFO interrupt simultaneously. Use Value: Prevents corrupted register writes during undervoltage; PFO-triggered firmware save ensures data integrity across power cycles. |
Use Scenario: Portable handheld test equipment operates from Li-ion batteries with steep discharge curves and intermittent loads. IC Role / Device Role / Timing Role: MAX6706SKA+ detects VCC drop below 2.93V and PFI drop below 0.62V (from 1.8V rail), triggering controlled shutdown before brownout lockup. Use Value: 140ms reset hold time allows safe EEPROM write completion; low 20µA quiescent current extends battery life. |
| Critical µP Power Monitoring | Networking Equipment |
Use Scenario: Base station control modules demand fail-safe reset behavior under telecom-grade power interruptions (e.g., -48V DC backup switchover). IC Role / Device Role / Timing Role: MAX6706SKA+ supervises primary 3.3V FPGA supply and secondary 1.2V core rail via PFI, generating coordinated RESET and PFO signals. Use Value: Dual-threshold supervision prevents premature restart during backup power transition; 125°C rating supports enclosed chassis operation. |
Use Scenario: Ethernet switches experience transient surges on PoE-powered rails and require glitch-immune reset during hot-plug events. IC Role / Device Role / Timing Role: MAX6706SKA+ monitors 5V PoE-derived rail and uses WDI to verify switch ASIC firmware heartbeat; WDO flags watchdog faults to management CPU. Use Value: 100ns MR glitch rejection prevents false resets; latch-on-WDO timeout enables diagnostic logging before corrective action. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6706TKA+ | Reset threshold = 3.08V (vs. 2.93V); otherwise identical pinout, timing, and features | Suitable for +3.3V systems with tighter tolerance margins; less margin for 3.0V nominal rails | Select MAX6706TKA+ if system VCC nominal is 3.3V and requires higher trip point to avoid nuisance resets near 3.1V |
| MAX6705SKA+ | Active-low push-pull RESET (vs. active-high); identical PFI/PFO/WDO/WDI functionality and thresholds | Required when host µP accepts only active-low reset assertion; no change to power-fail or watchdog logic | Choose MAX6705SKA+ only when board-level reset signal polarity is fixed to low-active; otherwise MAX6706SKA+ simplifies interface |
Compared with MAX6706TKA+, MAX6706SKA+ offers lower reset threshold (2.93V vs. 3.08V), enabling earlier brownout detection in 3.0V systems; compared with MAX6705SKA+, its active-high RESET eliminates need for external inverter or µP configuration changes - reducing design risk and layout complexity.
Availability
MAX6706SKA+ is available at Aetrix Electronics and suitable for industrial controllers, intelligent instruments, and critical µP power monitoring applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MAX6706SKA+ 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 markets, with emphasis on reliability, integration, and low-power operation.
The MAX6701–MAX6708 family was engineered specifically for multivoltage microprocessor supervision in space- and power-constrained systems, delivering reset, watchdog, and power-fail functions in a single 8-pin SOT23 package.
FAQ
What is the exact reset threshold voltage for MAX6706SKA+?
The MAX6706SKA+ has a nominal VCC reset threshold of 2.93V, with guaranteed limits of 2.83V (min) to 3.02V (max) over the full -40°C to +125°C operating temperature range. This value is defined by the 'S' suffix in the part number and is factory-trimmed - not adjustable externally. The threshold applies solely to the VCC pin; PFI retains its fixed 0.62V reference.
Does MAX6706SKA+ support active-high reset output?
Yes, MAX6706SKA+ provides an active-high push-pull RESET output, as confirmed in Maxim's datasheet (page 5, Pin Description). This distinguishes it from MAX6705SKA+ (active-low) and MAX6707SKA+ (open-drain). The RESET pin goes high during reset assertion and remains high for the full 140–280ms timeout period after VCC rises above threshold or MR is released.
How does the watchdog timer behave on MAX6706SKA+?
The MAX6706SKA+ watchdog timer has a typical timeout of 1.6s and is cleared by any rising or falling edge on WDI. If no edge occurs within the timeout window, WDO latches low and remains low until a valid WDI transition or MR low occurs. Unlike non-A versions, WDO deasserts immediately upon WDI edge - no additional delay - enabling fast fault recovery in safety-critical firmware.
Can MAX6706SKA+ monitor voltages other than VCC?
Yes, MAX6706SKA+ can monitor secondary voltages using the PFI pin. By connecting an external resistor divider to PFI, designers set a custom trip point referenced to the internal 0.62V comparator. For example, a 1.8V rail can trigger PFO at 1.75V by selecting R1/R2 to produce 0.62V at PFI when the rail reaches 1.75V - enabling early-warning power-fail detection independent of VCC.
What is the operating temperature range and package type of MAX6706SKA+?
MAX6706SKA+ is rated for -40°C to +125°C operation and is supplied in an 8-pin SOT23 package (package code K8+2). The '+' suffix indicates lead-free (RoHS-compliant) construction. This package supports standard surface-mount assembly and meets JEDEC moisture sensitivity level (MSL) requirements for automated manufacturing.
MAX6706SKA+ 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:
- 2.93V, 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+ FAQ
1.How can I place an order for MAX6706SKA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6706SKA+ 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+ reliable?
The price and inventory of MAX6706SKA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6706SKA+ is usually 5 days.
3.What payment methods are accepted for MAX6706SKA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6706SKA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6706SKA+?
MAX6706SKA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6706SKA+ 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+?
For technical support, including MAX6706SKA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6706SKA+ requirements.
6.How does Aetrix verify that MAX6706SKA+ is sourced from the original manufacturer or authorized distributors?
All MAX6706SKA+ 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+ meets industry standards.
7.What is the process for return or replacement of MAX6706SKA+?
All MAX6706SKA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6706SKA+, 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+ part is unused and in its original packaging.
Return procedure for MAX6706SKA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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