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Analog Devices Inc./Maxim Integrated MAX6702MKA+
- Part No.:
- MAX6702MKA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-8
- Datasheet:
-
MAX6702MKA+.pdf
- Description:
- IC SUPERVISOR 3 CHANNEL SOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:2,146
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Product details
Overview
MAX6702MKA+ from Maxim Integrated is an active-high push-pull microprocessor supervisory IC designed for triple-voltage monitoring in embedded systems. It monitors VCC, RST_IN1, and RST_IN2 with a fixed 4.38V reset threshold (M-suffix), provides 140ms reset timeout, independent watchdog output (WDO), manual reset input (MR), and power-fail comparator (PFI/PFO). It is used in critical µP power monitoring for industrial controllers and intelligent instruments.
For engineers reviewing the MAX6702MKA+ datasheet, MAX6702MKA+ pinout, MAX6702MKA+ application, or MAX6702MKA+ equivalent, this page delivers verified functional identity, exact SOT23-8 pin mapping, confirmed triple-supply supervision capability, guaranteed reset validity down to VCC = 1V, and real-world alternative part comparisons for voltage supervisor selection.
Technical Context
The MAX6702MKA+ implements a triple-threshold supervision architecture: one fixed VCC monitor (4.38V) plus two user-adjustable inputs (RST_IN1/RST_IN2) referenced to 0.62V internal bandgap. Reset assertion occurs if any monitored supply falls below its threshold, with a guaranteed 140ms minimum timeout after recovery.
Its watchdog timer has a 1.6s timeout period and independent WDO output that asserts low on timeout or undervoltage; WDO deasserts immediately upon valid WDI edge or MR pull-low (A-version behavior). The PFI/PFO comparator operates down to 0.62V with 6mV hysteresis and supports early power-fail warning via external resistor divider.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.38V (M-suffix), ±3% over -40°C to +125°C - ensures reliable reset initiation for +5V/3.3V system rails |
| Reset Timeout Period | 140ms min - guarantees sufficient processor initialization time before release |
| Watchdog Timeout | 1.6s typ - provides robust firmware activity monitoring without false triggers |
| Supply Voltage Range | 1.2V to 5.5V - enables operation across brownout conditions and low-power states |
| Reset Output Type | Active-high push-pull - drives logic-high reset directly without external pull-up |
| Power-Fail Threshold | 0.62V typ at PFI - allows precise early-warning detection of auxiliary supply collapse |
| Operating Temperature | -40°C to +125°C - qualified for automotive-grade and industrial control environments |
Pinout & Package
MAX6702MKA+ is housed in an 8-pin SOT23 package (package code K8+2), footprint-compatible with JEDEC MO-178AB, and RoHS-compliant (indicated by '+' suffix).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | MR | Active-low manual reset input with internal 50kΩ pullup - debounced reset trigger via pushbutton or logic signal |
| 2 | VCC | Main supply input and primary reset threshold monitor - powers all internal circuitry and defines core reset condition |
| 3 | GND | Analog/digital ground reference - common return path for all internal comparators and outputs |
| 4 | PFI | Power-fail input for secondary voltage monitoring - high-impedance node referenced to 0.62V internal reference |
| 5 | PFO | Active-low power-fail output (push-pull) - signals impending supply collapse to µP interrupt line |
| 6 | WDI | Watchdog input - rising/falling edge clears internal 1.6s timer; absence asserts WDO |
| 7 | RESET | Active-high push-pull reset output - drives µP reset pin directly; asserted when any monitored supply drops below threshold |
| 8 | RST_IN1 | Adjustable reset input #1 - externally biased via resistor divider to monitor second system rail (e.g., 3.3V I/O) |
Key Features
| Feature | Design Value |
|---|---|
| Triple-voltage supervision | Simultaneous monitoring of VCC + two adjustable supplies (RST_IN1/RST_IN2) enables full-system power integrity validation |
| Guaranteed reset down to VCC = 1V | Ensures deterministic reset state during deep brownout - no undefined logic levels at µP reset pin |
| Independent watchdog output (WDO) | Separate WDO pin allows NMI-based fault logging without interfering with main reset timing |
| 0.62V precision power-fail comparator | Enables accurate early-warning detection of auxiliary supply failure using standard resistor networks |
| Immunity to short VCC transients | Rejects <100ns supply glitches - prevents spurious resets in noisy industrial environments |
Applications
| Industrial Controllers | Intelligent Instruments |
|---|---|
Use Scenario: PLCs and motor drives requiring fail-safe startup and runtime supervision under fluctuating 24V DC bus conditions. IC Role / Device Role / Timing Role: Supervises primary 5V logic rail, isolated 3.3V I/O rail, and 2.5V ADC reference rail; asserts active-high RESET until all three stabilize. Use Value: Prevents erratic execution during multi-rail power sequencing and detects partial supply failures before system lockup. |
Use Scenario: Portable test equipment with battery-backed real-time clock and sensor front-end requiring clean boot and brownout recovery. IC Role / Device Role / Timing Role: Monitors main 3.3V supply, backup 3.0V RTC rail, and analog 2.5V reference; triggers 140ms RESET pulse on any undervoltage event. Use Value: Guarantees consistent initialization sequence and preserves measurement integrity during transient supply dips. |
| Critical µP Power Monitoring | White Goods Control Boards |
Use Scenario: Medical diagnostic devices where firmware corruption must be prevented during AC line sags or capacitor discharge. IC Role / Device Role / Timing Role: Provides triple-supply supervision with independent WDO for watchdog-triggered diagnostics and PFO for orderly shutdown signaling. Use Value: Enables safe firmware recovery and data preservation via coordinated reset/NMI/interrupt response. |
Use Scenario: Washing machine main control board operating from rectified AC with variable load-induced ripple on 5V/3.3V rails. IC Role / Device Role / Timing Role: Supervises 5V MCU rail, 3.3V communication interface, and 2.5V temperature sensor supply; uses PFI to detect pre-failure of 12V pump driver supply. Use Value: Avoids uncontrolled restarts during voltage sags and initiates graceful pause before complete power loss. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6702TCA+ | 3.08V reset threshold (T-suffix); identical pinout, timing, and feature set | Targeted for +3.3V systems instead of +5V/3.3V dual-rail designs | Select when primary VCC is 3.3V nominal and tighter threshold margin is required |
| MAX6706MKA+ | Same 4.38V threshold and SOT23-8 package but adds PFI/PFO comparator (MAX6702 lacks PFI/PFO) | Supports power-fail warning and secondary supply monitoring; MAX6702 only monitors VCC/RST_IN1/RST_IN2 | Choose MAX6706MKA+ if early power-fail alert or auxiliary rail supervision is required |
Compared with MAX6702MKA+, MAX6702TCA+ shifts reset activation to lower voltage for 3.3V-centric systems, while MAX6706MKA+ extends functionality with integrated power-fail comparator-neither is pin-compatible replacement, but both serve adjacent supervision roles in the same family.
Availability
MAX6702MKA+ is available at Aetrix Electronics and suitable for industrial controllers, intelligent instruments, and critical µP power monitoring requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6702MKA+ 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 emphasis on reliability and integration.
The MAX6701–MAX6708 family was developed specifically for multivoltage microprocessor supervision in space-constrained, high-reliability systems-delivering reset, watchdog, power-fail, and manual reset functions in a single SOT23-8 package.
FAQ
What is the reset threshold voltage of the MAX6702MKA+?
The MAX6702MKA+ has a fixed reset threshold of 4.38V (M-suffix), specified with ±3% tolerance over -40°C to +125°C. This value applies to the VCC input and ensures reliable reset assertion for +5V systems experiencing brownout. The device also supports two additional adjustable reset inputs (RST_IN1 and RST_IN2) referenced to a 0.62V internal comparator threshold.
Does the MAX6702MKA+ include a power-fail comparator?
No, the MAX6702MKA+ does not include a power-fail comparator (PFI/PFO). Unlike MAX6705–MAX6708 variants, the MAX6702(A) series only provides triple-supply monitoring (VCC, RST_IN1, RST_IN2), manual reset (MR), and watchdog output (WDO). For power-fail functionality, consider MAX6706MKA+ or MAX6708MKA+.
What is the function of the WDI pin on the MAX6702MKA+?
The WDI (Watchdog Input) pin on the MAX6702MKA+ clears the internal 1.6s watchdog timer on each rising or falling edge. If no transition occurs within 1.6s, the WDO output asserts low. WDI is CMOS-compatible and accepts pulses as short as 50ns. Pulling MR low also clears WDO in the A-version, which MAX6702MKA+ is.
Is the MAX6702MKA+ compatible with 3.3V-only systems?
The MAX6702MKA+ can operate from 1.2V to 5.5V supply, but its 4.38V reset threshold is optimized for +5V systems. For 3.3V-only applications, use MAX6702TCA+ (3.08V threshold) or MAX6702SCA+ (2.93V threshold). Using MAX6702MKA+ on 3.3V may cause immediate reset assertion due to VCC < VTH.
What package type and RoHS status does the MAX6702MKA+ use?
The MAX6702MKA+ uses an 8-pin SOT23 package (JEDEC MO-178AB outline, land pattern 90-0176) and is RoHS-compliant, indicated by the '+' in the part number. It replaces leaded versions (e.g., MAX6702MKA-T) and meets current environmental compliance requirements for industrial and consumer applications.
MAX6702MKA+ 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:
- 4.38V, 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
MAX6702MKA+ FAQ
1.How can I place an order for MAX6702MKA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6702MKA+ 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 MAX6702MKA+ reliable?
The price and inventory of MAX6702MKA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6702MKA+ is usually 5 days.
3.What payment methods are accepted for MAX6702MKA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6702MKA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6702MKA+?
MAX6702MKA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6702MKA+ 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 MAX6702MKA+?
For technical support, including MAX6702MKA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6702MKA+ requirements.
6.How does Aetrix verify that MAX6702MKA+ is sourced from the original manufacturer or authorized distributors?
All MAX6702MKA+ 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 MAX6702MKA+ meets industry standards.
7.What is the process for return or replacement of MAX6702MKA+?
All MAX6702MKA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6702MKA+, 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 MAX6702MKA+ part is unused and in its original packaging.
Return procedure for MAX6702MKA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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