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Analog Devices Inc./Maxim Integrated MAX6705SKA-T
- Part No.:
- MAX6705SKA-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-8
- Datasheet:
-
MAX6705SKA-T.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL SOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:4,827
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Product details
Overview
MAX6705SKA-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 power-fail comparator (0.62V threshold), manual reset input, and guaranteed reset validity down to VCC = 1.0V. It monitors +3.0V systems (3.00V–3.15V reset threshold) for reliable power-up/brownout detection in embedded controllers and telecom infrastructure.
For engineers reviewing the MAX6705SKA-T datasheet, MAX6705SKA-T pinout, MAX6705SKA-T application, or MAX6705SKA-T equivalent, this device delivers precision voltage supervision, deterministic watchdog behavior, and low-quiescent-current operation (12–25µA) critical for battery-backed instrumentation and white-goods control modules.
Technical Context
The MAX6705SKA-T implements a dual-comparator architecture: one fixed-threshold monitor for VCC (3.08V nominal at -40°C to +125°C), and an independent 0.62V reference-based comparator for PFI/PFO used for early power-fail warning. Its watchdog circuit asserts WDO low upon 1.6s WDI inactivity and clears on any edge transition - with no disable function.
Reset generation uses a 140ms timeout delay after VCC rises above threshold, and guarantees RESET assertion until VCC drops below 1.0V. The A-version watchdog output deasserts immediately when undervoltage conditions clear - unlike standard versions - enabling faster system recovery without requiring external debouncing.
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 +3.0V rails |
| Reset Timeout Delay | 140ms (min) - ensures µP initialization completes before release |
| Watchdog Timeout | 1.6s (typ), 0.96–2.52s over temperature - provides robust firmware activity monitoring |
| Supply Current | 12–25µA at VCC < 5.5V - enables long-term operation in low-power systems |
| Power-Fail Threshold | 0.62V (typ), 6mV hysteresis - supports accurate external voltage-divider-based warning circuits |
| Operating Voltage Range | 1.0V to 5.5V - guarantees functional reset assertion even during deep brownout |
| Reset Output Type | Active-low push-pull - drives logic directly without external pull-up resistor |
Pinout & Package
MAX6705SKA-T is housed in an 8-pin SOT23 package (package code K8+2), measuring 2.9mm × 1.6mm × 1.1mm, RoHS-compliant, with lead-free option available as MAX6705SKA+T.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 MR | Manual Reset Input | CMOS-compatible active-low input with internal 50kΩ pullup; forces reset when pulled low |
| 2 VCC | Supply & Primary Monitor Input | Power supply pin and input to main reset comparator; powers push-pull outputs |
| 3 GND | Ground Reference | System ground connection for all internal comparators and logic |
| 4 PFI | Power-Fail Input | High-impedance input to 0.62V comparator; accepts external resistive divider for custom trip points |
| 5 PFO | Power-Fail Output | Active-low push-pull output asserted when PFI < 0.62V; used for early warning interrupt |
| 6 WDI | Watchdog Input | Edge-sensitive input; toggling within 1.6s prevents WDO assertion; 50ns minimum pulse width |
| 7 RESET | Reset Output | Active-low push-pull output; asserted during power-up, brownout, MR activation, or watchdog timeout |
| 8 WDO | Watchdog Output | Independent active-low push-pull output; latched low on timeout, cleared by WDI edge or MR low |
Key Features
| Feature | Design Value |
|---|---|
| Guaranteed reset validity to VCC = 1.0V | Ensures deterministic reset assertion during deep brownout, preventing undefined µP states |
| 140ms reset timeout delay | Provides sufficient time for oscillator stabilization and memory initialization before µP release |
| Independent PFI/PFO comparator | Enables early power-fail warning without affecting reset timing - supports orderly shutdown sequences |
| A-version watchdog behavior | WDO deasserts immediately when VCC recovers - eliminates unnecessary system lockup after transient dips |
| Immunity to short falling VCC transients | Rejects sub-100ns supply glitches, preventing spurious resets in noisy industrial environments |
Applications
| Industrial Controllers | Telecom Power Management |
|---|---|
Use Scenario: Monitoring +3.0V DC-DC output in remote base station power modules. IC Role / Device Role: Supervises rail integrity, triggers watchdog reset on firmware hang, and signals impending AC loss via PFO interrupt. Use Value: Prevents silent failure during brownout; enables graceful shutdown before backup battery depletion. |
Use Scenario: Embedded management controller in optical line terminal (OLT) chassis. IC Role / Device Role: Provides primary reset for ARM-based controller and secondary PFI monitoring of +1.8V PHY supply. Use Value: Ensures deterministic boot sequence and isolates PHY faults before they propagate to upstream data path. |
| White-Goods MCU Supervision | Intelligent Instrumentation |
Use Scenario: Main control board in smart refrigerator with variable-speed compressor. IC Role / Device Role: Monitors +3.0V MCU supply and generates reset on power interruption; PFO alerts MCU to initiate defrost cycle abort. Use Value: Avoids EEPROM corruption during unexpected power loss and preserves food safety logic state. |
Use Scenario: Portable gas analyzer with battery-backed real-time clock and sensor interface. IC Role / Device Role: Supervises +3.0V system rail and provides watchdog oversight of sensor acquisition firmware. Use Value: Guarantees measurement integrity by forcing controlled restart on firmware freeze - critical for medical-grade accuracy. |
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 | 3.00V reset threshold (vs. 3.08V); tighter tolerance (±2.5% vs. ±3%) | Better suited for systems requiring exact 3.0V trip point under wide temperature range | Select when design requires lower nominal threshold with improved accuracy |
| TPS3808G30DBVR | 3.0V fixed threshold, 200ms reset delay, no PFI/PFO, no watchdog output | Lacks power-fail warning and independent watchdog output - simpler supervision only | Choose when only basic reset functionality is needed and cost sensitivity outweighs feature set |
Compared with MAX6705TKA-T, the MAX6705SKA-T offers higher nominal threshold and relaxed tolerance - advantageous for margin-rich +3.0V designs where slight overvoltage immunity is preferred. Against TPS3808G30DBVR, MAX6705SKA-T adds critical PFI/PFO and WDO functionality essential for fault-resilient instrumentation and telecom systems.
Availability
MAX6705SKA-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 (-40°C to +125°C).
Supply support for MAX6705SKA-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 high-performance analog and mixed-signal ICs for demanding industrial, communications, and computing applications.
The MAX6701–MAX6708 family was engineered specifically for multivoltage microprocessor supervision in space-constrained, reliability-critical systems - emphasizing low quiescent current, guaranteed reset behavior down to 1V, and integrated watchdog/power-fail functions.
FAQ
What is the reset threshold voltage for MAX6705SKA-T?
The MAX6705SKA-T has a nominal reset threshold of 3.08V, with guaranteed range of 3.00V to 3.15V at -40°C to +85°C and 2.97V to 3.17V over its full operating temperature range (-40°C to +125°C). This threshold applies to the VCC input and is factory-trimmed using the 'S' suffix designation per Maxim's Threshold Suffix Guide.
Does MAX6705SKA-T include a watchdog timer and independent watchdog output?
Yes, the MAX6705SKA-T includes a watchdog timer with 1.6s typical timeout period and an independent active-low push-pull watchdog output (WDO). WDO asserts low if the WDI input is not toggled within the timeout window and deasserts on a valid WDI edge or MR low - a key behavior of the 'A' version.
What is the function of the PFI and PFO pins on MAX6705SKA-T?
The PFI pin is a high-impedance input to an internal 0.62V comparator, used with an external resistor divider to detect falling voltages on secondary supplies. The PFO pin is its active-low push-pull output, asserting when PFI falls below 0.62V - enabling early power-fail warning without affecting the main reset timing of the MAX6705SKA-T.
Can MAX6705SKA-T operate down to 1.0V supply voltage?
Yes, the MAX6705SKA-T guarantees valid reset output behavior down to VCC = 1.0V. RESET remains a defined logic-low (≤0.4V) until VCC drops below 1.0V, ensuring deterministic microprocessor reset even during severe brownout conditions - a core specification confirmed in the Electrical Characteristics table.
What package type and footprint does MAX6705SKA-T use?
The MAX6705SKA-T uses an 8-pin SOT23 package (package code K8+2), with land pattern number 90-0176 and outline number 21-0078. Its compact 2.9mm × 1.6mm footprint supports high-density PCB layouts in space-constrained applications such as telecom modules and portable instrumentation.
MAX6705SKA-T 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:
- Multi-Voltage Supervisor
- Number of Voltages Monitored:
- 2
- Voltage - Threshold:
- 2.93V, 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
MAX6705SKA-T FAQ
1.How can I place an order for MAX6705SKA-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6705SKA-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 MAX6705SKA-T reliable?
The price and inventory of MAX6705SKA-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6705SKA-T is usually 5 days.
3.What payment methods are accepted for MAX6705SKA-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6705SKA-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6705SKA-T?
MAX6705SKA-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6705SKA-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 MAX6705SKA-T?
For technical support, including MAX6705SKA-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6705SKA-T requirements.
6.How does Aetrix verify that MAX6705SKA-T is sourced from the original manufacturer or authorized distributors?
All MAX6705SKA-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 MAX6705SKA-T meets industry standards.
7.What is the process for return or replacement of MAX6705SKA-T?
All MAX6705SKA-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6705SKA-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 MAX6705SKA-T part is unused and in its original packaging.
Return procedure for MAX6705SKA-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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