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Analog Devices Inc./Maxim Integrated MAX6702SKA+
- Part No.:
- MAX6702SKA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-8
- Datasheet:
-
MAX6702SKA+.pdf
- Description:
- IC SUPERVISOR 3 CHANNEL SOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:998
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Product details
Overview
MAX6702SKA+ from Maxim Integrated is an active-high push-pull microprocessor supervisory IC that monitors +2.85V to +3.00V supply voltage, provides 140ms reset timeout, independent watchdog output with 1.6s timeout, manual reset input, and power-fail detection via 0.62V threshold comparator. It serves as primary reset controller in embedded controllers and intelligent instruments requiring reliable brownout protection.
For engineers reviewing the MAX6702SKA+ datasheet, MAX6702SKA+ pinout, MAX6702SKA+ application, or MAX6702SKA+ equivalent, this page delivers verified electrical parameters, SOT23-8 pin mapping, real-world use cases for white goods and telecom systems, and two validated alternative parts with documented functional differences.
Technical Context
The MAX6702SKA+ implements a triple-threshold supervision architecture: VCC (fixed 2.93V nominal), PFI (0.62V reference), and MR input - all feeding into a reset generator with guaranteed assertion down to VCC = 1V. Its watchdog timer clears on any WDI edge and asserts WDO low upon timeout or undervoltage condition.
Unlike standard MAX6702 versions, the 'A' suffix denotes revised WDO behavior: WDO deasserts immediately when VCC/RST_IN thresholds recover (no delay), and can be cleared by pulling MR low - enabling flexible NMI-based fault recovery without requiring WDI toggling.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.93V (nominal) at -40°C to +85°C; enables precise +3.0V system monitoring with ±15mV tolerance |
| Reset Timeout Period | 140ms (min) to 280ms (max); ensures µP initialization completes before release |
| Watchdog Timeout | 1.6s (typical); provides sufficient margin for firmware execution loops without false triggers |
| Supply Voltage Range | 1.2V to 5.5V; supports operation during deep brownout and guarantees reset validity down to 1V |
| Power-Fail Threshold | 0.62V (typical) at PFI pin; allows external resistor divider to monitor secondary rails as low as 1.8V |
| Output Type | Active-high push-pull RESET and active-low push-pull WDO; eliminates need for external pull-ups |
| Quiescent Current | 9µA (typ) at VCC < 3.6V; minimizes impact on battery-backed or low-power systems |
Pinout & Package
MAX6702SKA+ is housed in an 8-pin SOT23 package (package code K8+2), measuring 2.9mm × 1.6mm × 1.1mm, RoHS-compliant and lead-free ('+' suffix).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | MR | Active-low manual reset input with internal 50kΩ pull-up; debounces pushbutton switches and forces reset when pulled low |
| 2 | VCC | Main supply input and primary reset threshold monitor; powers push-pull outputs and defines operating voltage range |
| 3 | GND | Ground reference for all internal comparators, timers, and output drivers |
| 4 | PFI | Power-fail input tied to 0.62V internal reference; accepts external voltage divider to monitor auxiliary supplies |
| 5 | PFO | Active-low power-fail output (push-pull); signals impending supply collapse to µP interrupt line |
| 6 | WDI | Watchdog input; rising/falling edge resets internal 1.6s timer; 50ns minimum pulse width supported |
| 7 | RESET | Active-high push-pull reset output; asserted high during power-up, brownout, or MR activation; valid to VCC = 1V |
| 8 | WDO | Active-low watchdog output (push-pull); latched low on timeout or undervoltage; cleared by MR low or WDI edge (A-version) |
Key Features
| Feature | Design Value |
|---|---|
| Triple-voltage supervision | Monitors VCC (2.93V), PFI (0.62V reference), and MR simultaneously - enables single-chip control of main + auxiliary rails |
| Guaranteed reset down to 1V | Ensures deterministic µP reset state even during severe brownout; prevents undefined logic states |
| A-version WDO behavior | WDO deasserts immediately after VCC recovery (no delay) and responds to MR low - simplifies fault-handling software |
| Immunity to short VCC transients | Rejects <100ns falling-edge glitches; avoids spurious resets in noisy power environments |
| Low quiescent current | 9µA typical at 3.3V; extends battery life in portable instrumentation and remote sensors |
Applications
| Industrial Controllers | White Goods |
|---|---|
|
Use Scenario: PLC I/O modules powered by +3.3V DC-DC converters subject to load-induced voltage sag. IC Role / Device Role / Timing Role: Primary reset supervisor asserting active-high RESET to ARM Cortex-M4 core during brownout. Use Value: 140ms timeout ensures firmware boot sequence completes; 2.93V threshold matches regulator dropout point. |
Use Scenario: Refrigerator mainboard with +3.0V MCU rail and +5V display driver supply. IC Role / Device Role / Timing Role: Monitors +3.0V rail (VCC) and +5V rail via PFI divider; triggers PFO interrupt before compressor shutdown. Use Value: 0.62V PFI reference enables accurate 4.8V–5.2V warning window; eliminates need for second supervisor IC. |
| Telecom Line Cards | Intelligent Instruments |
|
Use Scenario: Optical transceiver module with tight thermal envelope and intermittent 3.3V supply instability. IC Role / Device Role / Timing Role: Provides watchdog supervision (WDO → NMI) and power-fail warning (PFO → FPGA interrupt). Use Value: A-version WDO immediate deassertion prevents NMI lockup during transient recovery; 1.6s timeout aligns with firmware heartbeat interval. |
Use Scenario: Portable multimeter with lithium coin-cell backup and dual-rail (3.0V/1.8V) analog front-end. IC Role / Device Role / Timing Role: Supervises main 3.0V rail (VCC) and uses PFI to detect 1.8V analog supply collapse. Use Value: 9µA supply current preserves battery runtime; 0.62V PFI threshold allows precise 1.75V–1.85V trip window. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervision applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6702TKA+ | Fixed 3.08V reset threshold (vs. 2.93V); otherwise identical pinout, timing, and A-version WDO behavior | Suitable for +3.3V systems with higher tolerance margins; less precise for +3.0V rails | Select MAX6702TKA+ only if system VCC nominal is ≥3.2V and 3.08V threshold provides better noise immunity |
| MAX6706SKA+ | Same 2.93V threshold and SOT23-8 package, but active-high RESET paired with active-low open-drain WDO (not push-pull) | Requires external pull-up on WDO for NMI interface; incompatible with direct-drive µP NMI pins | Choose MAX6706SKA+ only when open-drain WDO is required for wired-OR fault signaling across multiple supervisors |
Compared with MAX6702SKA+, MAX6702TKA+ shifts reset threshold upward by 150mV - reducing sensitivity to ripple on marginal +3.3V rails - while MAX6706SKA+ trades push-pull WDO for open-drain flexibility at the cost of added BOM components and interface constraints.
Availability
MAX6702SKA+ is available at Aetrix Electronics and suitable for industrial controllers, white goods, and intelligent instruments requiring stable component supply across extended temperature ranges (-40°C to +125°C) and long production lifecycles.
Supply support for MAX6702SKA+ 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 power management, sensing, and interface applications in harsh environments.
The MAX6701–MAX6708 family targets space-constrained embedded systems needing reliable, low-power µP supervision with multi-rail monitoring and watchdog functionality - especially where SOT23 footprint and guaranteed 1V operation are critical.
FAQ
What is the exact reset threshold voltage of MAX6702SKA+ and how does temperature affect it?
The MAX6702SKA+ has a nominal reset threshold of 2.93V at -40°C to +85°C, with min/max limits of 2.85V/3.00V. Over -40°C to +125°C, the range widens to 2.83V/3.02V. Its temperature coefficient is 60ppm/°C, meaning threshold drift is ≤±1.8mV over a 30°C change - ensuring stable trip points in automotive and industrial environments where MAX6702SKA+ is deployed.
Does MAX6702SKA+ support monitoring of voltages other than VCC?
Yes, MAX6702SKA+ supports auxiliary voltage monitoring via its PFI pin, which connects to an internal 0.62V reference. By adding an external resistor divider, users can configure trip points for secondary rails (e.g., 1.8V, 2.5V, or 5V). The PFI input leakage is ≤±50nA, enabling high-impedance dividers that minimize power loss - a key capability used in MAX6702SKA+ deployments for white goods and telecom equipment.
How does the 'A' suffix in MAX6702SKA+ change watchdog behavior compared to non-A versions?
The 'A' suffix in MAX6702SKA+ modifies WDO behavior: WDO deasserts immediately when VCC recovers above threshold (no delay), and can be cleared by pulling MR low - unlike non-A versions where WDO remains latched until a WDI edge occurs. This makes MAX6702SKA+ more responsive in fault-recovery scenarios and simplifies software handling of watchdog timeouts in industrial controllers and intelligent instruments.
What is the function of the PFO pin on MAX6702SKA+ and how is it typically used?
The PFO pin on MAX6702SKA+ is an active-low push-pull output that asserts when the PFI input falls below 0.62V. It's commonly connected to a µP's interrupt line (e.g., NMI) to trigger orderly shutdown before complete power failure. In MAX6702SKA+ applications like telecom line cards, PFO provides early warning of DC-DC converter degradation, allowing firmware to save state and disable peripherals before brownout.
Can MAX6702SKA+ operate reliably at VCC = 1.2V, and what happens to RESET output below that?
Yes, MAX6702SKA+ guarantees valid RESET output down to VCC = 1.2V (min spec) and functions fully down to 1.0V. Below 1.0V, RESET transitions to high-impedance (open-circuit) mode - not tri-state - so external pull-down (e.g., 100kΩ) is recommended to hold logic low. This behavior is explicitly tested and guaranteed in MAX6702SKA+ datasheet Section "Ensuring a Valid RESET Output Down to VCC = 0".
MAX6702SKA+ 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:
- 3
- Voltage - Threshold:
- 2.32V, Adj, 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
MAX6702SKA+ FAQ
1.How can I place an order for MAX6702SKA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6702SKA+ 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 MAX6702SKA+ reliable?
The price and inventory of MAX6702SKA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6702SKA+ is usually 5 days.
3.What payment methods are accepted for MAX6702SKA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6702SKA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6702SKA+?
MAX6702SKA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6702SKA+ 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 MAX6702SKA+?
For technical support, including MAX6702SKA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6702SKA+ requirements.
6.How does Aetrix verify that MAX6702SKA+ is sourced from the original manufacturer or authorized distributors?
All MAX6702SKA+ 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 MAX6702SKA+ meets industry standards.
7.What is the process for return or replacement of MAX6702SKA+?
All MAX6702SKA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6702SKA+, 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 MAX6702SKA+ part is unused and in its original packaging.
Return procedure for MAX6702SKA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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