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Analog Devices Inc./Maxim Integrated MAX6703YKA
- Part No.:
- MAX6703YKA
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-8
- Datasheet:
-
MAX6703YKA.pdf
- Description:
- IC SUPERVISOR MPU
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
MAX6703YKA from Maxim Integrated is an 8-pin SOT23 microprocessor supervisory IC with active-low open-drain reset output, dual adjustable voltage monitoring (RST_IN1/RST_IN2), 1.6s watchdog timeout, and 0.62V power-fail comparator input. It monitors three supply rails-including VCC-and asserts reset during power-up, brownout, or manual trigger, supporting industrial controllers and embedded systems requiring triple-voltage supervision.
For engineers reviewing the MAX6703YKA datasheet, MAX6703YKA pinout, MAX6703YKA application, or MAX6703YKA equivalent, this device delivers precise undervoltage detection across multiple rails, latchable watchdog behavior with MR-controlled deassertion, and guaranteed reset validity down to VCC = 1V-critical for reliable µP boot sequencing in automotive and telecom infrastructure.
Technical Context
The MAX6703YKA implements a triple-threshold reset generator: one fixed VCC threshold (2.19V, per Y suffix) plus two user-adjustable thresholds via external resistor dividers on RST_IN1 and RST_IN2 pins, each referenced to an internal 0.62V comparator. Its watchdog timer resets only upon WDI edge transition and latches WDO low until cleared by MR or reset release.
Unlike non-A versions, the MAX6703YKA (A-version) deasserts WDO immediately when VCC/RST_IN1/RST_IN2 recover above threshold-no timeout delay-while retaining latched behavior on watchdog timeout. The open-drain RESET output supports flexible pull-up configurations and interfaces directly with µP reset inputs requiring active-low assertion.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Reset Threshold | 2.19V (Y-suffix), ±1.5% over -40°C to +125°C - sets primary power-good detection point for +2.5V system rails |
| Reset Timeout Period | 140ms (typ), 120–300ms over temperature - ensures µP remains held in reset long enough to stabilize clocks and peripherals |
| Watchdog Timeout | 1.6s (typ), 0.96–2.52s over temperature - provides sufficient margin for µP firmware execution cycles before fault detection |
| Power-Fail Input Threshold | 0.62V (typ), 6mV hysteresis - enables precise early-warning detection of secondary supplies via external divider |
| Supply Current | 9µA (typ) at VCC < 3.6V - minimizes quiescent load in battery-backed or low-power standby modes |
| RESET Output Type | Active-low open-drain - allows wired-OR reset bus sharing and level translation with external pull-up |
| Operating Voltage Range | 1.2V to 5.5V - supports operation during deep brownout and enables use with sub-2V logic domains |
Pinout & Package
MAX6703YKA uses an 8-pin SOT23-8 package (3.00mm × 1.75mm × 1.30mm body, 0.65mm pitch), optimized for high-density PCB layouts in space-constrained industrial and automotive modules.
| 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 and clears WDO in A-version |
| 2 VCC | Supply Voltage Input | Primary power rail input (1.2–5.5V); powers internal comparators, timer, and push-pull outputs; defines reset threshold reference |
| 3 GND | Ground Reference | Analog and digital ground return; must be low-impedance connection to minimize noise coupling into sensitive threshold comparators |
| 4 PFI | Power-Fail Input | High-impedance (±200nA leakage) comparator input referenced to 0.62V; accepts external resistor divider for secondary supply monitoring |
| 5 PFO | Power-Fail Output | Open-drain active-low output asserted when PFI < 0.62V; used to trigger µP interrupt or initiate orderly shutdown sequence |
| 6 WDI | Watchdog Input | Edge-sensitive input (50ns min pulse width); toggling within 1.6s prevents WDO assertion; no glitch rejection required |
| 7 RESET | Reset Output | Active-low open-drain output; sinks ≥1.2mA at VCC ≥ 2.55V; requires external pull-up for logic-level compatibility |
| 8 WDO | Watchdog Output | Active-low open-drain output; latched low on timeout or undervoltage; deasserted instantly on MR low or WDI edge in A-version |
Key Features
| Feature | Design Value |
|---|---|
| Dual Adjustable Reset Inputs | RST_IN1 and RST_IN2 accept external resistor dividers to monitor two additional supply rails (e.g., I/O and core voltages) with independent 0.62V reference |
| A-Version Watchdog Behavior | WDO deasserts immediately upon recovery of VCC/RST_IN1/RST_IN2 - eliminates unnecessary NMI interrupts during transient dips |
| Guaranteed Reset Validity to 1V | RESET output remains functional and logic-low down to VCC = 1V, ensuring deterministic µP hold condition during deep brownout |
| Immunity to Short VCC Transients | Rejects falling VCC transients ≤100ns duration, preventing false resets caused by switching noise or ESD-induced dips |
| Low Quiescent Current | 9µA typical supply current at 3.3V enables integration into always-on subsystems without compromising battery life |
Applications
| Industrial PLC Controller | Automotive Body Control Module |
|---|---|
Use Scenario: Monitors main 5V supply, 3.3V I/O rail, and 1.8V microcontroller core voltage in programmable logic controller hardware. IC Role / Device Role / Timing Role: Triple-voltage supervisor asserting unified active-low reset signal and generating early power-fail interrupt via PFO. Use Value: Prevents erratic PLC operation during partial rail collapse by holding µP in reset until all three supplies stabilize above their respective thresholds. | Use Scenario: Supervises battery-backed 3.3V MCU supply, 5V sensor interface rail, and 12V-to-5V converter output in vehicle door module. IC Role / Device Role / Timing Role: Detects brownout on any monitored rail and triggers watchdog-initiated reset if firmware hangs during CAN message processing. Use Value: Ensures fail-safe behavior during cold-cranking (9V battery dip) by maintaining reset assertion until all rails exceed 2.19V, 3.08V, and 4.38V thresholds respectively. |
| Telecom Line Card | Medical Infusion Pump |
Use Scenario: Provides power sequencing and fault monitoring for FPGA, DSP, and PHY ICs on high-density line card with multiple DC/DC outputs. IC Role / Device Role / Timing Role: Uses PFI/PFO to detect pre-failure condition on +12V bias supply and assert interrupt before regulator dropout. Use Value: Enables graceful packet buffering and link shutdown via µP interrupt, avoiding data corruption during AC mains interruption. | Use Scenario: Supervises safety-critical 3.3V MCU supply, isolated 5V actuator driver rail, and backup coin-cell voltage in Class II medical device. IC Role / Device Role / Timing Role: Generates latched watchdog timeout (WDO) that forces MR-triggered reset, guaranteeing full system restart on firmware lockup. Use Value: Meets IEC 62304 SW safety requirements by ensuring deterministic recovery from software faults without external intervention. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6703TKA | Fixed VCC threshold = 3.08V (T-suffix) vs. 2.19V (Y-suffix); identical pinout, A-version features, and triple-monitor architecture | Suitable for +3.3V systems where higher reset threshold prevents premature assertion during slow-rising rails | Select MAX6703TKA when supervising standard 3.3V logic rails; retain same layout and firmware interface |
| MAX6705YKA | Single-supply monitoring only (VCC only), no RST_IN1/RST_IN2 pins; includes PFI/PFO but lacks dual adjustable inputs | Applicable where only main supply supervision is needed and board space permits simpler 5-pin variant | Choose MAX6705YKA to reduce BOM count in cost-sensitive designs with single-rail architecture |
Compared with MAX6703TKA and MAX6705YKA, the MAX6703YKA uniquely supports triple-voltage monitoring with 2.19V primary threshold-making it optimal for low-voltage multi-rail systems like portable test equipment or battery-powered edge nodes where precise brownout detection below 2.5V is critical.
Availability
MAX6703YKA is available at Aetrix Electronics and suitable for industrial PLC controllers, automotive body control modules, telecom line cards, and medical infusion pumps requiring stable component supply across extended temperature ranges.
Supply support for MAX6703YKA 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, automotive, and communications markets, emphasizing reliability, low power, and high integration.
The MAX6701–MAX6708 family targets microprocessor supervision in harsh environments, delivering multirail monitoring, watchdog safety, and power-fail warning in ultra-small SOT23 packages for space-constrained embedded systems.
FAQ
What is the reset threshold voltage for MAX6703YKA?
The MAX6703YKA has a fixed VCC reset threshold of 2.19V (Y-suffix), specified with ±1.5% tolerance over -40°C to +125°C. This value is factory-trimmed and applies to the primary supply monitoring function. RST_IN1 and RST_IN2 inputs use an internal 0.62V reference, enabling user-defined thresholds via external resistor dividers for secondary rails.
Does MAX6703YKA support triple-voltage monitoring?
Yes, MAX6703YKA supports triple-voltage monitoring: VCC (2.19V fixed threshold), plus two user-adjustable rails via RST_IN1 and RST_IN2 pins. Each adjustable input references an internal 0.62V comparator, allowing precise threshold setting using external resistor dividers-enabling supervision of I/O, core, and auxiliary supplies simultaneously.
What is the watchdog timeout period for MAX6703YKA?
The MAX6703YKA watchdog timeout period is 1.6 seconds (typical), with a guaranteed range of 0.96s to 2.52s over -40°C to +125°C. The timer resets on any rising or falling edge at WDI and latches WDO low on timeout. In the A-version, WDO deasserts immediately upon recovery of VCC or reset inputs-or via MR low pulse.
How does the manual reset (MR) pin function on MAX6703YKA?
The MR pin on MAX6703YKA is an active-low CMOS input with internal 50kΩ pullup to VCC. Pulling MR low forces reset assertion and-critically in the A-version-also clears the latched WDO output. MR can be driven by a pushbutton or external logic; minimum pulse width is 1µs, and it rejects glitches <100ns.
What package type and footprint does MAX6703YKA use?
MAX6703YKA uses an 8-pin SOT23-8 package (3.00mm × 1.75mm × 1.30mm body, 0.65mm lead pitch). It is compatible with standard SOT23-8 reflow profiles and supports both leaded and lead-free assembly (designated by -T or +T suffix). The pinout matches industry-standard SOT23-8 layout with MR on pin 1 and GND on pin 3.
MAX6703YKA 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:
- 2.19V, Adj, Adj
- Output:
- Open Drain or Open Collector
- 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
MAX6703YKA FAQ
1.How can I place an order for MAX6703YKA through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6703YKA 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 MAX6703YKA reliable?
The price and inventory of MAX6703YKA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6703YKA is usually 5 days.
3.What payment methods are accepted for MAX6703YKA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6703YKA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6703YKA?
MAX6703YKA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6703YKA 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 MAX6703YKA?
For technical support, including MAX6703YKA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6703YKA requirements.
6.How does Aetrix verify that MAX6703YKA is sourced from the original manufacturer or authorized distributors?
All MAX6703YKA 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 MAX6703YKA meets industry standards.
7.What is the process for return or replacement of MAX6703YKA?
All MAX6703YKA units undergo pre-shipment inspection (PSI). If there is an issue with MAX6703YKA, 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 MAX6703YKA part is unused and in its original packaging.
Return procedure for MAX6703YKA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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