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Analog Devices Inc./Maxim Integrated MAX6703TKA+
- Part No.:
- MAX6703TKA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-8
- Datasheet:
-
MAX6703TKA+.pdf
- Description:
- LOW-VOLTAGE, SOT23 SUPERVISORS
- Quantity:
- Payment:
- Shipping:
Inventory:4,501
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Product details
Overview
MAX6703TKA+ from Maxim Integrated is a precision microprocessor supervisory IC in 8-pin SOT23 package, providing active-low open-drain reset output, dual adjustable voltage monitoring (RST_IN1/RST_IN2), manual reset input (MR), and independent watchdog timer with 1.6s timeout. It guarantees valid reset down to VCC = 1V and supports triple-voltage supervision for +5.0V/+3.3V/+2.5V systems in industrial controllers and white goods.
For engineers reviewing the MAX6703TKA+ datasheet, MAX6703TKA+ pinout, MAX6703TKA+ application, or MAX6703TKA+ equivalent, this device delivers deterministic brownout detection, power-fail warning via PFI/PFO, and latchable watchdog output - critical for reliable µP startup, fault recovery, and system-level power integrity validation in embedded control designs.
Technical Context
The MAX6703TKA+ implements a triple-threshold supervision architecture: primary VCC reset threshold (3.08V typ, T-suffix), plus two user-adjustable inputs (RST_IN1/RST_IN2) referenced to a 0.62V internal comparator. All three inputs independently trigger a single active-low open-drain RESET output with 140ms timeout delay.
Its watchdog circuit asserts WDO low after 1.6s of no WDI edge transition and deasserts only upon valid WDI toggle or MR pull-low - unlike non-A versions, it does not latch on undervoltage events alone. The PFI/PFO comparator operates down to 0.62V with 6mV hysteresis and <1µs propagation delay.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold (VCC) | 3.08V ±0.07V at -40°C to +125°C - precisely monitors +3.3V supply with guaranteed margin against dropout |
| Reset Timeout Delay | 140ms min - ensures µP completes power stabilization before release from reset |
| Watchdog Timeout Period | 1.6s typ - provides sufficient window for firmware watchdog servicing without false triggers |
| PFI Threshold Voltage | 0.62V ±9mV - enables accurate power-fail warning via external resistor divider |
| Supply Current (ICC) | 9–20µA at VCC < 3.6V - ultra-low quiescent draw for battery-backed or energy-sensitive systems |
| Operating Voltage Range | 1.2V to 5.5V - supports operation during deep brownout while maintaining reset validity |
| Reset Output Type | Active-low open-drain - allows wired-OR configuration and flexible pull-up voltage selection |
Pinout & Package
Package: 8-pin SOT23 (K8+2 outline), surface-mount, RoHS-compliant lead-free (+T suffix).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 MR | Active-low manual reset input | CMOS-compatible input with 50kΩ internal pullup; forces reset when pulled low; debounces pushbutton switches |
| 2 VCC | Supply voltage and primary reset monitor input | Power source for internal circuitry and reference for main reset threshold (3.08V) |
| 3 GND | Ground reference | Common return path for all analog comparators and digital logic |
| 4 PFI | Power-fail input | High-impedance comparator input referenced to 0.62V; accepts external voltage divider for secondary supply monitoring |
| 5 PFO | Power-fail output | Open-drain active-low output asserting when PFI < 0.62V; used for early power-loss interrupt signaling |
| 6 WDI | Watchdog input | Edge-triggered input; resets internal 1.6s timer on rising/falling transition; minimum pulse width 50ns |
| 7 RESET | Active-low open-drain reset output | Asserts low during VCC/RST_IN1/RST_IN2 undervoltage, MR assertion, or watchdog timeout; held low ≥140ms post-recovery |
| 8 WDO | Active-low open-drain watchdog output | Independent watchdog status signal; latches low on timeout or undervoltage; cleared by WDI edge or MR low |
Key Features
| Feature | Design Value |
|---|---|
| Dual adjustable reset inputs (RST_IN1/RST_IN2) | Enables simultaneous monitoring of three system rails (VCC + two aux supplies) using single 0.62V reference |
| Guaranteed reset validity to VCC = 1V | Ensures robust reset assertion during severe brownout conditions where many supervisors fail |
| Immunity to short falling VCC transients | Rejects sub-100ns supply dips that could falsely trigger reset in less robust devices |
| 140ms reset timeout with temperature stability | Provides consistent reset hold time across -40°C to +125°C without external timing components |
| Independent WDO and RESET outputs | Allows separate NMI handling (WDO → µP NMI) and core reset sequencing (RESET → µP RESET) |
Applications
| Industrial Controllers | White Goods Control Boards |
|---|---|
Use Scenario: Monitoring main +3.3V MCU supply, auxiliary +5V I/O rail, and backup battery voltage in programmable logic controllers. IC Role / Device Role / Timing Role: Triple-voltage supervisor ensuring synchronized reset release only after all rails stabilize above thresholds. Use Value: Prevents erratic MCU behavior during multi-rail power-up sequences and detects isolated rail failures before system lockup. |
Use Scenario: Supervising +3.3V microcontroller, +12V motor driver supply, and +5V sensor interface in washing machine mainboard. IC Role / Device Role / Timing Role: Active-low open-drain RESET enables shared reset bus; PFI/PFO warns of AC line sag before compressor shutdown. Use Value: Enables graceful shutdown sequence via µP interrupt (PFO → INT) and prevents EEPROM corruption during brownout. |
| Telecom Line Cards | Networking Equipment |
Use Scenario: Ensuring reliable boot of DSP-based line card after hot-swap insertion and detecting DC/DC converter faults. IC Role / Device Role / Timing Role: Watchdog monitors firmware health; RST_IN1 tracks +1.2V core supply; RESET holds DSP in reset until all voltages settle. Use Value: Eliminates need for discrete RC reset timers and reduces BOM count while improving MTBF through precise voltage thresholds. |
Use Scenario: Power sequencing and fault detection in 1U rack-mounted switch with multiple voltage domains (CPU, PHY, memory). IC Role / Device Role / Timing Role: PFI monitors +12V fan supply; WDO connects to µP NMI; MR supports remote reset via management controller. Use Value: Provides hardware-enforced power integrity checks independent of software, meeting NEBS Level 3 reliability requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6703TSA+ | Same pinout and function but S-suffix (2.93V VTH) - lower threshold for +3.0V systems | Suitable for designs using 3.0V nominal supply instead of 3.3V; requires recalculating RST_IN1/RST_IN2 dividers | Select when main supply is 3.0V ±5% and tighter reset margin is required |
| MAX6316US31D3+ | Single-supply supervisor (3.08V), no RST_IN1/RST_IN2, no PFI/PFO, no watchdog - simpler 3-pin SOT23 | Lacks triple-voltage monitoring and power-fail warning; only basic reset generation | Choose for cost-sensitive applications needing only primary VCC supervision without auxiliary features |
Compared with MAX6703TSA+ and MAX6316US31D3+, the MAX6703TKA+ uniquely combines triple-voltage monitoring, power-fail warning, and independent watchdog output in one 8-pin SOT23 - enabling compact, feature-rich supervision where space and functionality are both constrained.
Availability
MAX6703TKA+ is available at Aetrix Electronics and suitable for industrial controllers, white goods, and telecommunications equipment requiring stable component supply across extended temperature ranges (-40°C to +125°C) and long production lifecycles.
Supply support for MAX6703TKA+ 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 high-performance analog and mixed-signal ICs for demanding industrial, automotive, and communications applications.
The MAX6701–MAX6708 family targets space-constrained µP systems requiring precision voltage monitoring, deterministic reset timing, and integrated watchdog functionality - optimized for reliability in harsh environments.
FAQ
What is the exact reset threshold voltage for MAX6703TKA+ and how is it specified over temperature?
The MAX6703TKA+ has a nominal VCC reset threshold of 3.08V, with guaranteed range 2.97V to 3.17V over -40°C to +125°C. This T-suffix device is calibrated for +3.3V supply monitoring, and its 60ppm/°C temperature coefficient ensures minimal drift across full industrial temperature range - critical for systems operating near supply tolerance limits.
Does MAX6703TKA+ support monitoring of three independent supply voltages simultaneously?
Yes, the MAX6703TKA+ monitors three supplies: primary VCC (3.08V threshold), plus two user-adjustable inputs RST_IN1 and RST_IN2, each referenced to the internal 0.62V comparator. External resistor dividers set their trip points, and reset asserts if any input falls below its threshold - enabling true triple-rail supervision in a single 8-pin SOT23.
How does the watchdog behavior differ between MAX6703TKA+ and non-A versions like MAX6703TKT?
The MAX6703TKA+ watchdog output (WDO) deasserts immediately when undervoltage conditions clear, whereas non-A versions latch WDO low until a WDI edge occurs. Additionally, MAX6703TKA+ allows WDO deassertion by pulling MR low - a key distinction enabling controlled watchdog reset recovery not available in standard versions.
Can MAX6703TKA+ generate a power-fail interrupt before main supply collapse?
Yes, the MAX6703TKA+ uses its dedicated PFI input (0.62V threshold) and PFO output to provide early power-fail warning. By connecting PFI to a resistor divider from a higher-voltage rail (e.g., +12V), PFO asserts low well before VCC drops below 3.08V - giving the µP time to save state or initiate controlled shutdown before reset occurs.
What is the minimum VCC required for MAX6703TKA+ to guarantee valid RESET output assertion?
The MAX6703TKA+ guarantees RESET output remains a valid logic-low (≤0.4V) down to VCC = 1.0V, per datasheet specification. Below 1.0V, RESET becomes high-impedance - so designs requiring reset assertion below 1V must add an external pull-down resistor (e.g., 100kΩ) to ensure predictable low state during deep brownout.
MAX6703TKA+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SOT-23-8
- Packaging:
- 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+ FAQ
1.How can I place an order for MAX6703TKA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6703TKA+ 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+ reliable?
The price and inventory of MAX6703TKA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6703TKA+ is usually 5 days.
3.What payment methods are accepted for MAX6703TKA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6703TKA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6703TKA+?
MAX6703TKA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6703TKA+ 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+?
For technical support, including MAX6703TKA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6703TKA+ requirements.
6.How does Aetrix verify that MAX6703TKA+ is sourced from the original manufacturer or authorized distributors?
All MAX6703TKA+ 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+ meets industry standards.
7.What is the process for return or replacement of MAX6703TKA+?
All MAX6703TKA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6703TKA+, 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+ part is unused and in its original packaging.
Return procedure for MAX6703TKA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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