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Analog Devices Inc./Maxim Integrated MAX6705ATKA+T
- Part No.:
- MAX6705ATKA+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-8
- Datasheet:
-
MAX6705ATKA+T.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL SOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:2,541
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Product details
Overview
MAX6705ATKA+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. It monitors +5.0V/+3.3V/+3.0V/+2.5V supplies and guarantees valid reset down to VCC = 1V for critical µP power monitoring in white goods and telecom systems.
For engineers reviewing the MAX6705ATKA+T datasheet, MAX6705ATKA+T pinout, MAX6705ATKA+T application, or MAX6705ATKA+T equivalent, this page delivers verified circuit role, exact threshold voltage (3.08V nominal), reset timeout (140ms), watchdog behavior (A-version deasserts WDO on undervoltage recovery without delay), and real-world use cases in intelligent instruments and networking equipment.
Technical Context
The MAX6705ATKA+T implements a dual-comparator architecture: one fixed-threshold monitor for VCC (3.08V) and one externally adjustable 0.62V reference comparator for PFI, driving independent PFO and RESET outputs. Its A-version watchdog logic asserts WDO on VCC/RST_IN undervoltage but deasserts immediately upon recovery-unlike non-A versions that require WDI toggling.
Reset generation uses an internal 140ms timeout timer triggered by VCC falling below threshold, MR assertion, or (in MAX6704 only) watchdog timeout. The device operates across -40°C to +125°C with supply current as low as 9µA at VCC < 3.6V and supports guaranteed reset validity down to VCC = 1V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 3.08V (nominal, T-suffix), ±3% over -40°C to +125°C - sets precise brownout detection point for +3.3V systems |
| Reset Timeout Period | 140ms (typical), 120–300ms range - ensures µP holds reset long enough for stable power-up sequencing |
| Watchdog Timeout | 1.6s (typical), 0.96–2.52s over temperature - provides reliable activity monitoring without false triggers |
| Power-Fail Threshold | 0.62V (typical), 6mV hysteresis - enables accurate early-warning detection of secondary supply collapse |
| Supply Current | 9µA (typical at VCC < 3.6V, TA = +25°C) - minimizes quiescent load in battery-backed or low-power systems |
| Operating Voltage Range | 1.2V to 5.5V - supports operation during deep brownout while maintaining reset integrity |
| Output Type | Active-low push-pull RESET and WDO - eliminates need for external pull-up resistors in most µP interfaces |
Pinout & Package
Package: 8-pin SOT23 (K8+2 outline), RoHS-compliant lead-free, -40°C to +125°C operating range.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 MR | Active-low manual reset input | CMOS-compatible input with 50kΩ internal pullup; pulling low forces reset and clears watchdog (A-version) |
| 2 VCC | Main supply input | Primary reset threshold monitor input and power source for push-pull outputs; valid down to 1.2V |
| 3 GND | Ground reference | Common return path for all internal comparators and output drivers |
| 4 PFI | Power-fail input | High-impedance (±200nA leakage) 0.62V comparator input; accepts external resistor divider for custom trip points |
| 5 PFO | Power-fail output | Active-low push-pull output asserting when PFI < 0.62V; used for µP interrupt or orderly shutdown signaling |
| 6 WDI | Watchdog input | Edge-sensitive input; rising/falling edge resets 1.6s watchdog timer; 50ns minimum pulse width detectable |
| 7 RESET | Active-low reset output | Push-pull output asserted during VCC brownout, MR low, or watchdog timeout (MAX6704 only); guaranteed low ≤0.4V |
| 8 WDO | Active-low watchdog output | Independent push-pull output asserted on watchdog timeout or VCC/RST undervoltage; deasserts immediately on recovery (A-version) |
Key Features
| Feature | Design Value |
|---|---|
| Guaranteed reset validity to VCC = 1V | Ensures deterministic µP reset state even during severe brownout conditions before power collapse |
| Immunity to short falling VCC transients | Rejects sub-10µs supply dips, preventing spurious resets in noisy power environments |
| Independent PFI/PFO comparator | Enables early warning of secondary supply failure without affecting primary reset timing or thresholds |
| A-version watchdog deassertion logic | WDO releases immediately when VCC recovers above threshold-no WDI toggle required for recovery |
| 140ms reset timeout with temperature stability | Timer drift limited to ±20ms over -40°C to +125°C, ensuring consistent reset hold time across industrial temp range |
Applications
| Computers | Networking |
|---|---|
|
Use Scenario: Desktop motherboard power sequencing with +3.3V and +5V rails. IC Role / Device Role / Timing Role: Primary supervisor monitoring +3.3V (3.08V threshold) and generating 140ms reset pulse; PFI monitors +5V rail via divider for early fail warning. Use Value: Prevents boot corruption during AC line sags by holding reset until both supplies stabilize, while PFO interrupts CPU to save state before full collapse. |
Use Scenario: Enterprise switch line card with dual power inputs and watchdog-reliant firmware. IC Role / Device Role / Timing Role: Supervises main +3.3V supply and feeds WDI from FPGA heartbeat signal; WDO connected to NMI pin for immediate fault capture. Use Value: Detects firmware hangs within 1.6s and triggers non-maskable interrupt without resetting entire system-enabling diagnostics and graceful recovery. |
| Intelligent Instruments | White Goods |
|
Use Scenario: Portable handheld multimeter with lithium coin-cell backup and precision ADC. IC Role / Device Role / Timing Role: Monitors main +3.0V supply (via 3.08V threshold) and asserts RESET if voltage drops below safe ADC operating range. Use Value: Guarantees clean power-on reset and prevents corrupted measurements during battery depletion by holding µP in reset below 3.0V. |
Use Scenario: Smart refrigerator control board with compressor motor drive and communication module. IC Role / Device Role / Timing Role: Supervises +5V logic supply and uses PFI to monitor +12V motor driver rail; PFO triggers emergency shutdown sequence. Use Value: Enables predictive failure response-PFO interrupt allows MCU to disable compressor and log fault before main supply collapse causes latch-up. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6705TKA+T | Non-A version: WDO latches low on undervoltage and requires WDI toggle to deassert; no automatic recovery on VCC rise | Suitable where watchdog must remain asserted until explicit software acknowledgment (e.g., safety-critical lockout) | Select MAX6705TKA+T only if strict watchdog persistence is required; MAX6705ATKA+T preferred for responsive recovery. |
| TPS3808G30DBVR | Fixed 3.0V reset threshold (±0.5%), 200ms timeout, no PFI/PFO comparator or watchdog output | Limited to single-rail monitoring without power-fail warning or independent watchdog signaling | Choose TPS3808G30DBVR only for cost-sensitive, single-threshold applications lacking PFI/WDO requirements. |
Compared with MAX6705TKA+T, the MAX6705ATKA+T offers faster watchdog recovery without software intervention, while versus TPS3808G30DBVR it adds essential power-fail warning and dual-output supervision-making it uniquely suited for multi-rail, fault-aware embedded systems.
Availability
MAX6705ATKA+T is available at Aetrix Electronics and suitable for critical µP power monitoring, intelligent instrumentation, and white goods requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6705ATKA+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, communications, and computing applications, with emphasis on reliability and integration.
The MAX6701–MAX6708 family targets space-constrained µP systems needing consolidated power supervision-replacing discrete reset generators, watchdog timers, and power-fail comparators with a single 8-pin SOT23 device.
FAQ
What is the exact reset threshold voltage for MAX6705ATKA+T?
The MAX6705ATKA+T has a nominal reset threshold of 3.08V (T-suffix), with guaranteed tolerance of ±3% over -40°C to +125°C. This value is factory-trimmed and specified in the Electrical Characteristics table under "VTH" for MAX670_T/MAX670_AT variants. It is optimized for reliable supervision of +3.3V supply rails in industrial and telecom equipment.
How does the watchdog behavior differ between MAX6705ATKA+T and MAX6705TKA+T?
The MAX6705ATKA+T watchdog output (WDO) deasserts immediately when VCC rises above the 3.08V threshold after an undervoltage event-even without a WDI toggle. In contrast, the non-A version MAX6705TKA+T latches WDO low until a valid WDI edge is detected. This makes the A-version ideal for systems requiring automatic watchdog recovery without firmware involvement.
Can MAX6705ATKA+T monitor voltages other than VCC?
Yes. The MAX6705ATKA+T includes a dedicated 0.62V reference comparator accessible via PFI/PFO pins. By connecting PFI to a resistor divider from any external voltage rail (e.g., +12V, +5V), users can configure early power-fail warning at custom thresholds. The PFI input draws only ±200nA, enabling high-impedance divider networks with minimal loading.
What is the function of the MR pin on MAX6705ATKA+T?
The MR (Manual Reset) pin on MAX6705ATKA+T is an active-low CMOS input with internal 50kΩ pullup to VCC. Pulling MR low forces RESET assertion for the full 140ms timeout period and clears the watchdog timer. In A-version devices, pulling MR low also deasserts WDO-enabling hardware-initiated watchdog reset without relying on WDI timing.
Is MAX6705ATKA+T compatible with 1.8V I/O systems?
No. While the MAX6705ATKA+T guarantees RESET validity down to VCC = 1.2V, its input thresholds (MR, WDI, PFI) are referenced to VCC and require VCC ≥ 2.1V for full specification compliance per the Z/Y-suffix operating ranges. For true 1.8V operation, consider the MAX6369 series or similar low-voltage supervisors explicitly rated for 1.8V VCC.
MAX6705ATKA+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
MAX6705ATKA+T FAQ
1.How can I place an order for MAX6705ATKA+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6705ATKA+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 MAX6705ATKA+T reliable?
The price and inventory of MAX6705ATKA+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6705ATKA+T is usually 5 days.
3.What payment methods are accepted for MAX6705ATKA+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6705ATKA+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6705ATKA+T?
MAX6705ATKA+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6705ATKA+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 MAX6705ATKA+T?
For technical support, including MAX6705ATKA+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6705ATKA+T requirements.
6.How does Aetrix verify that MAX6705ATKA+T is sourced from the original manufacturer or authorized distributors?
All MAX6705ATKA+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 MAX6705ATKA+T meets industry standards.
7.What is the process for return or replacement of MAX6705ATKA+T?
All MAX6705ATKA+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6705ATKA+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 MAX6705ATKA+T part is unused and in its original packaging.
Return procedure for MAX6705ATKA+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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