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Analog Devices Inc./Maxim Integrated MAX6701SKA
- Part No.:
- MAX6701SKA
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-8
- Datasheet:
-
MAX6701SKA.pdf
- Description:
- IC SUPERVISOR MPU
- Quantity:
- Payment:
- Shipping:
Inventory:1,627
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Product details
Overview
MAX6701SKA from Maxim Integrated is a low-voltage microprocessor supervisory circuit in an 8-pin SOT23 package, providing active-low push-pull reset output, 140ms reset timeout, 0.62V power-fail comparator input, and 1.6s watchdog timer with independent WDO output. It monitors +5.0V/+3.3V/+3.0V/+2.5V supplies and guarantees valid reset down to VCC = 1V for embedded controller power sequencing.
For engineers reviewing the MAX6701SKA datasheet, MAX6701SKA pinout, MAX6701SKA application, or MAX6701SKA equivalent, this device supports triple-voltage supervision (VCC + RST_IN1 + RST_IN2), manual reset assertion via MR, and brownout detection with hysteresis-key for automotive ECUs, industrial controllers, and telecom power management systems.
Technical Context
The MAX6701SKA implements a dual-adjustable reset architecture: primary VCC threshold (suffix-dependent, e.g., 4.63V for 'L') plus two user-configurable inputs (RST_IN1/RST_IN2) referenced to a 0.62V internal bandgap. Its watchdog timer triggers WDO low after 1.6s of no WDI edge transition, and resets are latched until all monitored voltages exceed thresholds plus timeout.
Reset generation uses a precision voltage comparator with 60ppm/°C temperature coefficient and guaranteed operation from VCC = 1.2V. The active-low push-pull RESET output sinks ≥1.2mA at VCC ≥ 2.55V (VOL ≤ 0.3V), while MR features an internal 50kΩ pullup and 100ns glitch rejection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Operating Range | 1.2V to 5.5V - supports wide-input industrial and automotive power rails without external regulation |
| Reset Threshold (VTH) | 4.63V (L-suffix) ±3% - factory-trimmed for precise +5V system monitoring with 60ppm/°C drift |
| Reset Timeout Period (tRP) | 140ms (typ) - ensures µP initialization completes before release, immune to short VCC transients |
| Watchdog Timeout (tWD) | 1.6s (typ) - provides sufficient margin for firmware watchdog servicing in real-time control loops |
| Power-Fail Input Threshold | 0.62V (typ) - enables accurate early-warning detection of secondary supply collapse via external resistor divider |
| Supply Current (ICC) | 12µA (typ at VCC=5V) - ultra-low quiescent current extends battery life in always-on monitoring applications |
| MR Input Logic Levels | VIL = 0.3×VCC, VIH = 0.7×VCC - CMOS-compatible interface for direct connection to GPIO or pushbutton circuits |
Pinout & Package
Package: 8-pin SOT23-8, 3.0mm × 1.75mm × 1.3mm body, lead-free (RoHS-compliant) option available as MAX6701SKA+T.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | MR | Active-low manual reset input with internal 50kΩ pullup; asserts RESET/WDO when pulled low; 100ns glitch rejection |
| 2 | VCC | Main supply input powering internal comparators, timer, and push-pull outputs; reset valid down to 1.2V |
| 3 | GND | Analog/digital ground reference for all internal comparators and output drivers |
| 4 | PFI | High-impedance power-fail input referenced to 0.62V internal reference; accepts external resistor-divider for custom trip points |
| 5 | PFO | Active-low open-drain power-fail output; asserts when PFI < 0.62V; supports wired-OR interrupt signaling |
| 6 | WDI | Watchdog input requiring edge transition every 1.6s; detects pulses as short as 50ns; clears internal timer on rising/falling edge |
| 7 | RESET | Active-low push-pull reset output; sinks ≥1.2mA at VCC≥2.55V (VOL≤0.3V); asserted during power-up, brownout, or MR activation |
| 8 | WDO | Independent active-low watchdog output; latched low on timeout or undervoltage; deasserts only on valid WDI edge or MR low (A-version) |
Key Features
| Feature | Design Value |
|---|---|
| Triple-voltage supervision | Simultaneous monitoring of VCC + RST_IN1 + RST_IN2 using single 0.62V reference enables compact multi-rail systems without extra ICs |
| Guaranteed reset to 1V | RESET remains functional and logic-low (VOL ≤ 0.4V) even as VCC decays to 1.0V, ensuring clean shutdown in deep brownout |
| Immunity to VCC transients | Rejects falling VCC glitches <100ns duration, preventing spurious resets in noisy power environments |
| Configurable reset output stage | Push-pull drive eliminates need for external pullup resistors, reducing BOM count and PCB area in space-constrained designs |
| Integrated power-fail comparator | Externally accessible PFI/PFO pins allow flexible early-warning implementation-e.g., triggering µP save-to-EEPROM before main rail collapse |
Applications
| Automotive Engine Control Unit (ECU) | Industrial PLC I/O Module |
|---|---|
Use Scenario: Monitoring 5V sensor supply, 3.3V MCU core, and 2.5V ADC reference rails during cold-crank battery dip. IC Role / Device Role / Timing Role: Triple-voltage supervisor asserting synchronized reset across domains when any rail falls below threshold. Use Value: Prevents corrupted CAN message transmission by holding MCU in reset until all critical supplies stabilize post-dip. |
Use Scenario: Detecting imminent failure of isolated 24V-to-5V DC-DC converter feeding fieldbus interface ASIC. IC Role / Device Role / Timing Role: Power-fail comparator (PFI→PFO) generating NMI interrupt 10ms before 5V rail collapse. Use Value: Enables PLC firmware to flush serial buffer and disable outputs before loss of communication capability. |
| Telecom Base Station Controller | White Goods Inverter Drive |
Use Scenario: Supervising redundant +3.3V FPGA configuration supply and +1.2V core supply in fanless outdoor enclosure. IC Role / Device Role / Timing Role: Watchdog timer (WDI→WDO) connected to FPGA GPIO to detect firmware hang during RF calibration routine. Use Value: Forces controlled FPGA reconfiguration without requiring full system reboot, minimizing service interruption. |
Use Scenario: Monitoring 15V gate-driver supply and 5V MCU supply in variable-speed motor drive under high EMI conditions. IC Role / Device Role / Timing Role: MR input tied to overtemperature shutdown signal from thermal sensor to initiate safe motor coast-down. Use Value: Guarantees gate drivers remain disabled during thermal fault, preventing shoot-through and IGBT destruction. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervision applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6705SKA | Single-supply monitor (VCC only) with identical PFI/PFO and WDO functionality; same 140ms tRP and 1.6s tWD | Lacks RST_IN1/RST_IN2 inputs - suitable only for single-rail systems, not triple-voltage supervision | Select MAX6705SKA when monitoring only one supply rail and board space allows same SOT23-8 footprint |
| TPS3808G33DBVR | TI part with 3.3V fixed reset threshold, 200ms timeout, no PFI/PFO, no WDO - only RESET output | No power-fail warning or independent watchdog output; requires external circuitry for those functions | Choose TPS3808G33DBVR only if PFI/PFO and WDO are unnecessary and 3.3V-only supervision suffices |
Compared with MAX6705SKA and TPS3808G33DBVR, the MAX6701SKA uniquely delivers triple-voltage supervision, integrated power-fail warning, and independent watchdog output in a single SOT23-8 package-enabling higher system reliability without increasing component count or layout complexity.
Availability
MAX6701SKA is available at Aetrix Electronics and suitable for automotive engine control units, industrial PLC modules, and telecom base station controllers requiring stable component supply across extended temperature ranges (-40°C to +125°C).
Supply support for MAX6701SKA 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 targets cost-sensitive, space-constrained µP systems needing reliable power sequencing, brownout protection, and watchdog safety-especially where multi-rail supervision is required without external components.
FAQ
What is the reset threshold voltage for MAX6701SKA?
The MAX6701SKA has a factory-trimmed VCC reset threshold of 4.63V (L-suffix), with ±3% tolerance over -40°C to +125°C and 60ppm/°C temperature coefficient. This value is confirmed in the Electrical Characteristics table and applies specifically to the 'L' threshold variant denoted in the part number suffix.
Does MAX6701SKA support monitoring three different supply voltages?
Yes, the MAX6701SKA supports triple-voltage supervision: primary VCC (4.63V), plus two adjustable inputs RST_IN1 and RST_IN2, each referenced to the internal 0.62V comparator. External resistor dividers set their trip points independently, enabling simultaneous monitoring of +5V, +3.3V, and +2.5V rails with one IC.
What is the function of the WDO pin on MAX6701SKA?
The WDO (Watchdog Output) pin on MAX6701SKA is an active-low, independent output that goes low when the watchdog timer expires (after 1.6s without WDI toggle) or when VCC/RST_IN1/RST_IN2 fall below threshold. Unlike RESET, WDO remains asserted until cleared by a valid WDI edge or MR low pulse.
Can MAX6701SKA operate with supply voltage below 2.0V?
Yes, the MAX6701SKA guarantees functional reset output down to VCC = 1.2V, with RESET remaining a valid logic low (VOL ≤ 0.4V) until VCC drops below 1.0V. This enables reliable brownout detection and controlled shutdown in low-voltage battery-powered systems.
How does the manual reset (MR) input interact with the watchdog output on MAX6701SKA?
On the MAX6701SKA (A-version), pulling MR low asserts both RESET and WDO outputs simultaneously. When MR is released, WDO deasserts immediately if no watchdog timeout occurred, but remains latched low if timeout had already triggered-requiring a WDI edge to clear it. This behavior is documented in the Standard- vs. A-Version Comparison section.
MAX6701SKA 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:
- Power Supply Monitor
- Number of Voltages Monitored:
- 3
- Voltage - Threshold:
- 2.93V, Adj, Adj
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- 120ms Minimum
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-8
MAX6701SKA FAQ
1.How can I place an order for MAX6701SKA through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6701SKA 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 MAX6701SKA reliable?
The price and inventory of MAX6701SKA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6701SKA is usually 5 days.
3.What payment methods are accepted for MAX6701SKA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6701SKA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6701SKA?
MAX6701SKA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6701SKA 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 MAX6701SKA?
For technical support, including MAX6701SKA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6701SKA requirements.
6.How does Aetrix verify that MAX6701SKA is sourced from the original manufacturer or authorized distributors?
All MAX6701SKA 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 MAX6701SKA meets industry standards.
7.What is the process for return or replacement of MAX6701SKA?
All MAX6701SKA units undergo pre-shipment inspection (PSI). If there is an issue with MAX6701SKA, 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 MAX6701SKA part is unused and in its original packaging.
Return procedure for MAX6701SKA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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