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Analog Devices Inc./Maxim Integrated MAX6703MKA
- Part No.:
- MAX6703MKA
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-8
- Datasheet:
-
MAX6703MKA.pdf
- Description:
- IC SUPERVISOR 3 CHANNEL SOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:947
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Product details
Overview
The MAX6703MKA from Maxim Integrated is an active-low, open-drain microprocessor supervisory circuit in 8-pin SOT23 package, designed to monitor three supply voltages (one fixed VCC threshold + two adjustable via RST_IN1/RST_IN2), assert reset during power-up/brownout/down, provide 1.6s watchdog timeout with independent WDO output, and support manual reset via MR pin. It operates across -40°C to +125°C and guarantees valid reset down to VCC = 1V.
For engineers reviewing the MAX6703MKA datasheet, MAX6703MKA pinout, MAX6703MKA application, or MAX6703MKA equivalent, this device serves as a triple-voltage supervisor with open-drain reset, integrated watchdog timer, and 0.62V power-fail comparator - critical for robust µP reset sequencing in automotive and industrial control systems.
Technical Context
The MAX6703MKA implements a dual-adjustable reset architecture: VCC is monitored against a factory-trimmed threshold (suffix 'M' = 4.38V), while RST_IN1 and RST_IN2 accept external resistor dividers to set two additional thresholds at 0.62V reference. Its watchdog timer triggers WDO low if WDI is not toggled within 1.6s (typ), and WDO deasserts only upon valid WDI edge or MR pull-low - no automatic timeout recovery.
Reset assertion occurs when any monitored voltage (VCC, RST_IN1, or RST_IN2) falls below its threshold; RESET remains low for 140–300ms after all voltages recover. The open-drain RESET output supports wired-OR configurations and interfaces directly with µP reset inputs requiring active-low, high-impedance hold-off.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Reset Threshold | 4.38V (±3%, -40°C to +125°C); factory-trimmed for stable +5V system supervision |
| Adjustable Threshold Reference | 0.62V (typ) internal reference for RST_IN1/RST_IN2; enables precise monitoring of +3.3V/+2.5V rails via external dividers |
| Reset Timeout Period | 140ms (min) to 300ms (max); ensures µP initialization completes before release |
| Watchdog Timeout Period | 1.6s (typ), 0.96–2.52s (min–max); provides fail-safe detection of µP lockup without software intervention |
| Supply Voltage Range | 1.2V to 5.5V; guarantees functional reset assertion even during deep brownout conditions |
| RESET Output Type | Active-low open-drain; allows level-shifting, bus sharing, and pull-up to higher voltage rail |
| Operating Temperature | -40°C to +125°C; qualified for under-hood automotive and industrial embedded environments |
Pinout & Package
MAX6703MKA uses an 8-pin SOT23-8 package (3.00mm × 1.75mm × 1.30mm body, 0.65mm pitch). Pin 1 marked with dot; pins 1–4 on left side, 5–8 on right side (top view).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 MR | Manual Reset Input | CMOS-compatible active-low input with 50kΩ internal pullup; forces reset when pulled low; also clears watchdog timer |
| 2 VCC | Main Supply Input | Primary power source and input to main reset comparator; powers internal logic and push-pull outputs (not used here) |
| 3 GND | Ground Reference | System ground return for all internal comparators, timers, and output drivers |
| 4 PFI | Power-Fail Input | High-impedance input to 0.62V comparator; connects to external divider for early power-fail warning |
| 5 PFO | Power-Fail Output | Open-drain active-low output asserted when PFI < 0.62V; used for µP interrupt or secondary reset initiation |
| 6 WDI | Watchdog Input | Edge-sensitive input; rising or falling edge resets 1.6s watchdog timer; 50ns minimum pulse width detectable |
| 7 RESET | Reset Output | Active-low open-drain output; asserted during VCC/RST_IN1/RST_IN2 undervoltage, MR low, or watchdog timeout |
| 8 WDO | Watchdog Output | Active-low open-drain output; latched low on watchdog timeout or undervoltage; cleared only by WDI edge or MR low |
Key Features
| Feature | Design Value |
|---|---|
| Dual Adjustable Reset Inputs | RST_IN1 and RST_IN2 enable simultaneous monitoring of two auxiliary rails (e.g., +3.3V I/O and +2.5V core) using single 0.62V reference |
| Independent Watchdog Output (WDO) | WDO asserts independently of RESET, allowing NMI-based fault logging without disrupting µP boot sequence |
| Guaranteed Reset Valid to VCC = 1V | Ensures deterministic reset behavior during deep brownout, preventing µP runaway before full power collapse |
| Immunity to Short Falling VCC Transients | Rejects <100ns glitches on VCC, avoiding spurious resets in noisy power environments |
| Low Quiescent Current | 9–25µA typical ICC (VCC < 3.6V); minimizes impact on battery-backed or energy-constrained systems |
Applications
| Automotive Engine Control Unit (ECU) | Industrial PLC I/O Module |
|---|---|
|
Use Scenario: Monitoring +5V main supply, +3.3V CAN transceiver rail, and +2.5V ADC reference in harsh under-hood environment. IC Role / Device Role / Timing Role: Triple-voltage supervisor asserting open-drain RESET to ARM Cortex-M7, with WDO feeding NMI to log watchdog timeouts before reset. Use Value: Prevents ECU firmware corruption during cold-crank brownout by guaranteeing reset until all rails stabilize above thresholds. |
Use Scenario: Supervising isolated +24V-to-+5V DC-DC output, +3.3V FPGA I/O bank, and +1.2V FPGA core in modular PLC backplane. IC Role / Device Role / Timing Role: Configured with RST_IN1 monitoring +3.3V and RST_IN2 monitoring +1.2V, driving shared RESET bus across multiple modules. Use Value: Enables synchronized restart of entire I/O subsystem when any critical rail fails, eliminating partial initialization states. |
| White Goods Main Controller | Networking Edge Router Baseboard |
|
Use Scenario: Power sequencing for +5V MCU, +3.3V Wi-Fi module, and +2.5V sensor interface in refrigerator control board. IC Role / Device Role / Timing Role: Uses PFI/PFO to trigger orderly shutdown via µP interrupt when AC line sags, while RESET holds MCU in reset. Use Value: Extends appliance lifespan by preventing EEPROM writes during unstable power, enforced by 0.62V precision PFI threshold. |
Use Scenario: Supervising +12V PoE PD interface, +5V switch ASIC, and +3.3V management CPU in compact edge router. IC Role / Device Role / Timing Role: WDO connected to CPU NMI pin; MR tied to front-panel reset button; RESET drives ASIC reset with open-drain flexibility. Use Value: Delivers field-recoverable lockup detection: watchdog timeout triggers NMI handler to initiate graceful reboot instead of hard reset. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6703TKA | Lower VCC reset threshold (3.08V vs. 4.38V); same pinout, timing, and feature set | Designed for +3.3V systems rather than +5V; requires revalidation of RST_IN1/RST_IN2 divider ratios | Select when primary supply is +3.3V and 4.38V threshold would cause premature reset assertion |
| MAX6707MKA | Identical VCC threshold (4.38V) and triple-voltage capability, but RESET is open-drain active-high (not active-low) | Requires inverted reset logic on µP side; incompatible with standard active-low reset inputs without external inverter | Choose only if system design mandates active-high reset signaling and layout accommodates polarity inversion |
Compared with MAX6703TKA and MAX6707MKA, the MAX6703MKA uniquely combines +5V-compatible 4.38V threshold, active-low open-drain RESET, and triple-supply monitoring - making it optimal for legacy +5V µP systems needing direct drop-in reset integration without logic inversion or threshold recalibration.
Availability
MAX6703MKA is available at Aetrix Electronics and suitable for automotive engine control units, industrial PLC I/O modules, white goods main controllers, and networking edge router baseboards requiring stable component supply across extended temperature ranges.
Supply support for MAX6703MKA 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 highly integrated, low-power µP supervisors with configurable reset thresholds, watchdog timers, and power-fail detection - engineered for reliability in safety-critical embedded systems.
FAQ
What is the reset threshold voltage for MAX6703MKA?
The MAX6703MKA has a factory-trimmed VCC reset threshold of 4.38V (±3%) over -40°C to +125°C. This value is defined by the 'M' suffix in the part number and is optimized for reliable supervision of +5V microprocessor supplies during power-up, brownout, and power-down events.
Does MAX6703MKA support monitoring of multiple supply rails?
Yes, the MAX6703MKA monitors three supply rails: VCC (4.38V fixed threshold), plus two user-adjustable rails via RST_IN1 and RST_IN2 inputs. Each adjustable input references an internal 0.62V comparator, enabling precise supervision of +3.3V, +2.5V, or other voltages using external resistor dividers.
What is the function of the WDO pin on MAX6703MKA?
The WDO (Watchdog Output) pin on MAX6703MKA is an active-low open-drain output that asserts when the watchdog timer expires (1.6s timeout) or when VCC/RST_IN1/RST_IN2 fall below their thresholds. Unlike RESET, WDO remains latched low until cleared by a WDI edge or MR pull-low - enabling independent NMI-based fault handling.
Can MAX6703MKA operate down to 1V supply voltage?
Yes, the MAX6703MKA guarantees valid reset assertion down to VCC = 1V. Below 1V, the RESET output becomes high-impedance, but the device continues to monitor inputs and assert RESET as long as VCC ≥ 1V - ensuring deterministic behavior during deep brownout conditions common in automotive and battery-powered systems.
What package type does MAX6703MKA use?
The MAX6703MKA uses an 8-pin SOT23-8 package (3.00mm × 1.75mm × 1.30mm body, 0.65mm pitch), with pin 1 identified by a dot. This compact, surface-mount package supports high-density PCB layouts and is qualified for reflow soldering per JEDEC MO-178 standards.
MAX6703MKA 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:
- 3
- Voltage - Threshold:
- 4.38V, Adj, Adj
- Output:
- Open Drain or Open Collector
- Reset:
- Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-8
MAX6703MKA FAQ
1.How can I place an order for MAX6703MKA through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6703MKA 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 MAX6703MKA reliable?
The price and inventory of MAX6703MKA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6703MKA is usually 5 days.
3.What payment methods are accepted for MAX6703MKA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6703MKA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6703MKA?
MAX6703MKA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6703MKA 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 MAX6703MKA?
For technical support, including MAX6703MKA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6703MKA requirements.
6.How does Aetrix verify that MAX6703MKA is sourced from the original manufacturer or authorized distributors?
All MAX6703MKA 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 MAX6703MKA meets industry standards.
7.What is the process for return or replacement of MAX6703MKA?
All MAX6703MKA units undergo pre-shipment inspection (PSI). If there is an issue with MAX6703MKA, 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 MAX6703MKA part is unused and in its original packaging.
Return procedure for MAX6703MKA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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