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Analog Devices Inc./Maxim Integrated MAX6703TKA+T
- Part No.:
- MAX6703TKA+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-8
- Datasheet:
-
MAX6703TKA+T.pdf
- Description:
- IC SUPERVISOR 3 CHANNEL SOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:3,881
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Product details
Overview
MAX6703TKA+T from Maxim Integrated is an active-low open-drain microprocessor supervisory IC for triple-voltage monitoring (VCC + two adjustable inputs), featuring 140ms reset timeout, 1.6s watchdog timer, 0.62V power-fail comparator input, and manual reset input - used in critical µP power monitoring for white goods and telecom systems.
For engineers reviewing the MAX6703TKA+T datasheet, MAX6703TKA+T pinout, MAX6703TKA+T application, or MAX6703TKA+T equivalent, this device delivers precise brownout detection across three supply rails, latchable watchdog output, and guaranteed reset validity down to VCC = 1V in industrial-temperature SOT23 packaging.
Technical Context
The MAX6703TKA+T implements a triple-threshold supervision architecture: primary VCC reset threshold (3.08V typ, T-suffix), plus two user-adjustable reset inputs (RST_IN1/RST_IN2) referenced to 0.62V internal bandgap. It asserts active-low open-drain RESET when any monitored voltage falls below its threshold and holds it for 140–300ms after recovery.
Its independent watchdog circuit monitors WDI transitions with 1.6s timeout (0.96–2.52s over temp), asserting active-low open-drain WDO on timeout or undervoltage - deasserting only upon valid WDI edge or MR low pulse (A-version behavior). Power-fail detection uses PFI/PFO with 1µs propagation delay and 6mV hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold (VCC) | 3.08V typical at +25°C; ±30mV over -40°C to +125°C - sets brownout point for main 3.3V rail |
| Reset Timeout Period | 140ms minimum at +25°C; extends to 300ms at +125°C - ensures µP initialization completes before release |
| Watchdog Timeout | 1.6s typical; 0.96–2.52s over full temperature range - provides reliable firmware activity verification window |
| Power-Fail Input Threshold | 0.62V ±9mV over -40°C to +125°C - enables precise secondary supply monitoring via external divider |
| Supply Current | 9–20µA at VCC < 3.6V, no load - supports ultra-low-power battery-backed or energy-harvesting systems |
| Operating Voltage Range | 1.2V to 5.5V - guarantees functional reset assertion even during deep brownout conditions |
| Output Type | Active-low open-drain RESET and WDO - allows wired-OR configuration and level translation with external pull-up |
Pinout & Package
MAX6703TKA+T is housed in an 8-pin SOT23 package (package code K8+2), measuring 2.9mm × 1.6mm × 1.1mm, RoHS-compliant and lead-free.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 MR | Active-low manual reset input | CMOS-compatible input with 50kΩ internal pullup; forces RESET/WDO assertion when pulled low |
| 2 VCC | Main supply input | Powers internal circuitry and defines primary reset threshold; valid from 1.2V to 5.5V |
| 3 GND | Ground reference | Common return path for all analog and digital functions; must be low-impedance |
| 4 PFI | Power-fail monitor input | High-impedance (±200nA leakage) 0.62V-referenced comparator input for secondary supply monitoring |
| 5 PFO | Power-fail output | Open-drain active-low output asserted when PFI < 0.62V; used for early power-fail warning |
| 6 WDI | Watchdog input | Edge-sensitive input; toggling required every ≤1.6s to prevent WDO assertion |
| 7 RESET | Active-low reset output | Open-drain output asserted during VCC/RST_IN1/RST_IN2 brownout or MR activation |
| 8 WDO | Active-low watchdog output | Independent open-drain output asserted on watchdog timeout or undervoltage condition |
Key Features
| Feature | Design Value |
|---|---|
| Dual adjustable reset inputs (RST_IN1/RST_IN2) | Enables simultaneous monitoring of three system rails (e.g., 3.3V, 1.8V, 1.2V) using external resistor dividers |
| Guaranteed reset validity to VCC = 1V | Ensures deterministic µP reset state during deep undervoltage events without external support circuitry |
| Immunity to short falling VCC transients | Rejects sub-100ns supply glitches, preventing spurious resets in noisy power environments |
| 140ms reset timeout with temperature compensation | Provides stable timing margin across -40°C to +125°C without external capacitor dependency |
| Independent watchdog output (WDO) | Allows separate NMI or fault logging without interfering with primary reset sequencing |
Applications
| Computers | Networking |
|---|---|
Use Scenario: Monitoring 3.3V core, 1.8V I/O, and 1.2V CPU rails in embedded x86/ARM compute modules. IC Role / Device Role / Timing Role: Triple-voltage supervisor providing synchronized reset assertion and independent watchdog oversight. Use Value: Prevents boot failures caused by staggered rail collapse; enables firmware-level watchdog recovery without hardware reset loop. |
Use Scenario: Ensuring clean startup and brownout resilience in 10G Ethernet line cards with multiple DC-DC converters. IC Role / Device Role / Timing Role: Primary power supervisor for FPGA, PHY, and management MCU, with PFI-linked PFO triggering graceful link shutdown. Use Value: Eliminates packet corruption during partial power loss by initiating controlled MAC/PHY reset before VCC dropout. |
| White Goods | Telecommunications |
Use Scenario: Supervising main 5V logic, 3.3V sensor interface, and 2.5V display controller in smart refrigerator control boards. IC Role / Device Role / Timing Role: Critical µP power monitor with manual reset for service mode entry and watchdog for motor control firmware lockup detection. Use Value: Meets IEC 60335 safety requirements by guaranteeing reset during AC brownouts and enabling field-service diagnostics. |
Use Scenario: Power sequencing and failure detection in LTE base station remote radio units (RRUs) operating at -40°C to +85°C. IC Role / Device Role / Timing Role: Industrial-temperature supervisor for GaN PA bias supplies, FPGAs, and fronthaul processors. Use Value: Supports extended temperature operation with ±30mV reset threshold stability, reducing thermal derating overhead. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6703TKA-T | Same functionality and pinout, but leaded (Pb-containing) packaging instead of lead-free (+T) | Not suitable for RoHS-compliant production; requires Pb-based solder process | Select only if legacy assembly line mandates Pb-based soldering and exemption applies |
| MAX6707TKA+T | Identical triple-voltage supervision and watchdog, but features open-drain PFO and RST_IN1/RST_IN2 - same reset threshold and timing | Supports additional power-fail signaling flexibility via PFO; otherwise drop-in compatible | Choose when secondary power-fail interrupt routing requires open-drain PFO instead of push-pull |
Compared with MAX6703TKA+T, the MAX6703TKA-T lacks RoHS compliance for new designs, while MAX6707TKA+T adds open-drain PFO capability without altering core supervision behavior - making it a functionally enhanced alternative where PFO signal conditioning is needed.
Availability
MAX6703TKA+T is available at Aetrix Electronics and suitable for critical µP power monitoring, white goods control, and telecommunications infrastructure requiring stable component supply across industrial temperature ranges.
Supply support for MAX6703TKA+T 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 applications, with emphasis on reliability and integration.
The MAX6701–MAX6708 family targets compact, high-reliability µP supervision in space-constrained systems - delivering multi-rail monitoring, watchdog, and power-fail warning in a single 8-pin SOT23 package.
FAQ
What is the reset threshold voltage for MAX6703TKA+T?
The MAX6703TKA+T has a nominal VCC reset threshold of 3.08V at +25°C, with tolerance of ±30mV over the full -40°C to +125°C operating range. This T-suffix variant is optimized for 3.3V system supervision and remains stable across temperature and supply variations, ensuring consistent brownout detection without external calibration.
Does MAX6703TKA+T support monitoring of three different supply voltages?
Yes, MAX6703TKA+T monitors three supply voltages: the main VCC rail (3.08V threshold), plus two user-adjustable rails via RST_IN1 and RST_IN2 pins - each referenced to an internal 0.62V comparator. External resistor dividers set custom thresholds, enabling supervision of mixed-voltage domains like 3.3V, 1.8V, and 1.2V simultaneously.
What is the watchdog timeout period for MAX6703TKA+T?
The MAX6703TKA+T watchdog timeout period is 1.6s typical at +25°C, with a guaranteed range of 0.96s to 2.52s across -40°C to +125°C. It triggers WDO assertion if the WDI input is not toggled within this window, and clears only on a valid edge transition - supporting robust firmware liveness checking in safety-critical applications.
How does the manual reset (MR) pin function on MAX6703TKA+T?
The MR pin on MAX6703TKA+T is an active-low CMOS input with internal 50kΩ pullup to VCC. Pulling MR low forces immediate assertion of both RESET and WDO outputs for the full reset timeout period (≥140ms), then releases them after the timeout expires. It also serves as a watchdog clear mechanism in A-version logic, enabling coordinated reset initiation.
Is MAX6703TKA+T compatible with lead-free PCB assembly processes?
Yes, MAX6703TKA+T is RoHS-compliant and qualified for lead-free reflow soldering per JEDEC J-STD-020. The "+T" suffix explicitly denotes lead-free packaging (Pb-free terminations and matte tin plating), supporting peak reflow temperatures up to +260°C - making it suitable for modern high-volume electronics manufacturing without exemption requirements.
MAX6703TKA+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SOT-23-8
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Multi-Voltage Supervisor
- Number of Voltages Monitored:
- 3
- Voltage - Threshold:
- 3.08V, 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
MAX6703TKA+T FAQ
1.How can I place an order for MAX6703TKA+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6703TKA+T 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 MAX6703TKA+T reliable?
The price and inventory of MAX6703TKA+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6703TKA+T is usually 5 days.
3.What payment methods are accepted for MAX6703TKA+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6703TKA+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6703TKA+T?
MAX6703TKA+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6703TKA+T 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 MAX6703TKA+T?
For technical support, including MAX6703TKA+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6703TKA+T requirements.
6.How does Aetrix verify that MAX6703TKA+T is sourced from the original manufacturer or authorized distributors?
All MAX6703TKA+T 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 MAX6703TKA+T meets industry standards.
7.What is the process for return or replacement of MAX6703TKA+T?
All MAX6703TKA+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6703TKA+T, 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 MAX6703TKA+T part is unused and in its original packaging.
Return procedure for MAX6703TKA+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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