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Analog Devices Inc./Maxim Integrated MAX6705TKA+T
- Part No.:
- MAX6705TKA+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-8
- Datasheet:
-
MAX6705TKA+T.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL SOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:2,151
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Product details
Overview
MAX6705TKA+T from Maxim Integrated is a single-supply microprocessor supervisory IC in 8-pin SOT23 package, providing active-low push-pull reset output, independent watchdog timer with 1.6s timeout, adjustable 0.62V power-fail comparator (PFI/PFO), and manual reset input - used for reliable power-up sequencing and brownout protection in embedded controllers and telecom equipment.
For engineers reviewing the MAX6705TKA+T datasheet, MAX6705TKA+T pinout, MAX6705TKA+T application, or MAX6705TKA+T equivalent, this device delivers guaranteed reset validity down to VCC = 1V, immunity to short VCC transients, and precise voltage monitoring for +3.3V/+2.5V systems requiring stable µP supervision under industrial temperature conditions (–40°C to +125°C).
Technical Context
The MAX6705TKA+T implements a dedicated reset generator with internal 140ms timeout delay, a separate watchdog timer that asserts WDO low upon 1.6s WDI inactivity, and an uncommitted comparator with 0.62V reference for external power-fail detection via PFI. Its reset logic responds to VCC falling below the T-suffix threshold (3.08V typ), MR assertion, or watchdog timeout - all while maintaining guaranteed reset assertion until VCC ≥ 1V.
Unlike the MAX6704/MAX6708, it includes both independent WDO and PFO outputs; unlike the MAX6701(A)–MAX6703(A), it monitors only VCC (not dual adjustable supplies). The A-version ensures WDO deasserts immediately when undervoltage clears - no timeout delay - and supports MR-driven WDO deassertion.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 3.08V (typ), ±3% over –40°C to +125°C - sets precise brownout detection point for +3.3V systems |
| Reset Timeout Delay | 140ms (min), 280ms (max) - ensures µP remains held in reset long enough for stable clock and supply settling |
| Watchdog Timeout | 1.6s (typ), 0.96–2.52s over temperature - provides robust software activity monitoring without false triggers |
| Power-Fail Threshold | 0.62V (typ), 6mV hysteresis - enables accurate early-warning detection of secondary supply collapse via external divider |
| Supply Current | 9–20µA at VCC < 3.6V - ultra-low quiescent current preserves battery life in always-on monitoring applications |
| Operating Voltage Range | 1.2V to 5.5V - guarantees functional reset assertion even during deep brownout down to 1.2V |
| Reset Output Type | Active-low push-pull - drives µP reset pin directly without external pull-up; sinks 3.2mA at VCC ≥ 4.25V |
Pinout & Package
MAX6705TKA+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 (denoted by "+T" suffix). Pin 1 is MR (manual reset input), pin 2 is VCC, pin 3 is GND, pin 4 is PFI, pin 5 is PFO, pin 6 is WDI, pin 7 is RESET, and pin 8 is WDO - all pins are CMOS-compatible with internal 50kΩ MR pullup.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - MR | Active-low manual reset input | Pull low to force reset; internally pulled up to VCC (50kΩ); also clears watchdog timer and deasserts WDO in A-version |
| 2 - VCC | Main supply input and primary reset monitor | Power source for internal circuitry; reset asserted when VCC falls below 3.08V threshold |
| 3 - GND | Ground reference | Common return path for all analog and digital functions; must be low-impedance for noise immunity |
| 4 - PFI | Power-fail input | High-impedance node connected to internal 0.62V comparator; accepts external resistor divider for custom trip points |
| 5 - PFO | Power-fail output | Active-low open-drain output; asserts when PFI < 0.62V - used for early warning interrupt or cascaded reset initiation |
| 6 - WDI | Watchdog input | Edge-sensitive input; rising or falling edge resets 1.6s watchdog timer; pulses as short as 50ns are detected |
| 7 - RESET | Active-low reset output | Push-pull driver; guaranteed low (≤0.4V) down to VCC = 1V; holds µP in known state during power transitions |
| 8 - WDO | Active-low watchdog output | Independent push-pull output; asserts on watchdog timeout or VCC/RST_IN undervoltage - usable as NMI signal |
Key Features
| Feature | Design Value |
|---|---|
| Guaranteed reset validity to VCC = 1V | Ensures deterministic µP reset behavior during deep brownout, eliminating risk of undefined startup states |
| 140ms minimum reset timeout | Meets JEDEC JESD78 reliability requirements for reset pulse width, preventing premature release before supply stabilization |
| Independent WDO and PFO outputs | Enables simultaneous system-level fault signaling (NMI) and orderly shutdown preparation (PFO → µP interrupt) |
| 0.62V precision power-fail comparator | Allows accurate early-warning detection of secondary supply collapse using high-value resistive dividers (nA input leakage) |
| A-version watchdog behavior | WDO deasserts immediately upon recovery from undervoltage - no timeout delay - improving system responsiveness |
| Immunity to short VCC transients | Rejects <100ns supply glitches, preventing spurious resets in noisy industrial or automotive power environments |
Applications
| Industrial Controllers | Telecom Power Management |
|---|---|
|
Use Scenario: Programmable logic controllers (PLCs) operating in factory-floor environments with fluctuating 24V DC rails converted to +3.3V logic supplies. IC Role / Device Role / Timing Role: Supervises +3.3V rail and initiates hard reset if voltage drops below 3.08V; provides 140ms hold time for FPGA configuration stability. Use Value: Prevents corrupted firmware execution during line sags - critical for safety-critical motion control sequences. |
Use Scenario: Line-card power supervisors in carrier-grade Ethernet switches where +3.3V I/O and +2.5V core supplies require coordinated reset timing. IC Role / Device Role / Timing Role: Monitors main +3.3V supply and uses PFI/PFO to detect early droop on +2.5V auxiliary rail, triggering graceful shutdown before brownout. Use Value: Enables 100ms advance warning via PFO interrupt, allowing packet buffer flush and link deactivation before loss of service. |
| White Goods MCU Systems | Intelligent Instrumentation |
|
Use Scenario: Embedded microcontrollers in refrigerators and washing machines exposed to wide ambient temperatures (–25°C to +70°C) and noisy AC/DC converter ripple. IC Role / Device Role / Timing Role: Provides reset during cold-start and brownout; MR pin interfaces with door-switch debounce circuitry for user-initiated reset. Use Value: Eliminates need for external RC reset networks - reduces BOM count and improves thermal drift performance across temperature range. |
Use Scenario: Portable handheld test equipment (e.g., multimeters, oscilloscope probes) powered by Li-ion batteries with dynamic load profiles. IC Role / Device Role / Timing Role: Uses WDI to verify firmware liveness; WDO connects to µP NMI pin to trigger diagnostic dump on watchdog timeout. Use Value: Captures runtime faults before power collapse - essential for field failure analysis and regulatory compliance reporting. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervision applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6705TKA+T | Non-A version: WDO latches low on undervoltage and requires WDI edge to deassert; no MR-driven WDO deassertion | Lacks immediate WDO recovery on supply recovery - less responsive in fast-recovery systems | Select only if legacy design compatibility or strict timing predictability required over responsiveness |
| MAX6706TKA+T | Active-high push-pull RESET output instead of active-low; identical watchdog, PFI/PFO, and threshold specs | Requires inverted reset logic on µP side - incompatible with standard active-low reset inputs without level-shifting | Choose when host µP demands active-high reset assertion or when sharing PCB layout with MAX6702(A)/MAX6706(A) family |
Compared with MAX6705TKA+T, the MAX6705TKA+T lacks immediate WDO recovery on supply recovery, while MAX6706TKA+T changes reset polarity - both retain identical power-fail monitoring and 140ms timeout, but require board-level logic or layout adaptation.
Availability
MAX6705TKA+T is available at Aetrix Electronics and suitable for industrial controllers, telecom power management, and intelligent instrumentation requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6705TKA+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 demanding industrial, communications, and computing applications - emphasizing reliability, low power, and integration.
The MAX6701–MAX6708 family targets cost-sensitive, space-constrained µP supervision needs in harsh environments, delivering multi-function monitoring (reset, watchdog, power-fail) in minimal SOT23 footprint with guaranteed operation from –40°C to +125°C.
FAQ
What is the exact reset threshold voltage for MAX6705TKA+T?
The MAX6705TKA+T has a nominal reset threshold of 3.08V (typical), with guaranteed range of 2.97V to 3.17V over –40°C to +125°C. This T-suffix variant is optimized for +3.3V supply monitoring and is specified per the Threshold Suffix Guide in the MAX6701–MAX6708 datasheet. The threshold exhibits 60ppm/°C temperature coefficient, ensuring stable trip point across industrial temperature extremes.
Does MAX6705TKA+T support manual reset functionality?
Yes, MAX6705TKA+T includes an active-low manual reset input (MR) with internal 50kΩ pullup to VCC. Pulling MR low forces immediate reset assertion for ≥200ns, and RESET remains active for the full 140ms timeout after MR returns high. MR also clears the watchdog timer and - in the A-version - deasserts WDO, enabling flexible system-level reset coordination.
How does the watchdog timer behave in MAX6705TKA+T?
The MAX6705TKA+T watchdog timer times out after 1.6s (typical) if no edge is detected on WDI. Upon timeout, WDO asserts low independently of RESET. In the A-version, WDO deasserts immediately when VCC recovers above threshold or on valid WDI edge - unlike non-A versions which require WDI toggling to clear. WDI accepts pulses as short as 50ns and is CMOS-compatible.
Can MAX6705TKA+T monitor voltages other than VCC?
Yes, MAX6705TKA+T includes a dedicated 0.62V comparator accessible via PFI and PFO pins. By connecting PFI to a resistor divider from any system voltage (e.g., +2.5V, +1.8V), users can configure early power-fail warning at custom thresholds. Input leakage is ≤200nA, enabling use of high-value resistors for minimal quiescent current impact.
What package and environmental rating does MAX6705TKA+T have?
MAX6705TKA+T is supplied in an 8-pin SOT23 package (K8+2 outline), RoHS-compliant and lead-free (indicated by "+T" suffix). It operates across –40°C to +125°C ambient temperature, with junction temperature rated to +150°C. Absolute maximum VCC is +6.0V, and ESD rating is >2kV HBM - validated for industrial and telecom equipment deployment.
MAX6705TKA+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:
- 2
- Voltage - Threshold:
- 3.08V, Adj
- Output:
- Push-Pull, Totem Pole
- 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
MAX6705TKA+T FAQ
1.How can I place an order for MAX6705TKA+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6705TKA+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 MAX6705TKA+T reliable?
The price and inventory of MAX6705TKA+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6705TKA+T is usually 5 days.
3.What payment methods are accepted for MAX6705TKA+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6705TKA+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6705TKA+T?
MAX6705TKA+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6705TKA+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 MAX6705TKA+T?
For technical support, including MAX6705TKA+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6705TKA+T requirements.
6.How does Aetrix verify that MAX6705TKA+T is sourced from the original manufacturer or authorized distributors?
All MAX6705TKA+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 MAX6705TKA+T meets industry standards.
7.What is the process for return or replacement of MAX6705TKA+T?
All MAX6705TKA+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6705TKA+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 MAX6705TKA+T part is unused and in its original packaging.
Return procedure for MAX6705TKA+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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