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Analog Devices Inc./Maxim Integrated MAX6705ASKA+T
- Part No.:
- MAX6705ASKA+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-8
- Datasheet:
-
MAX6705ASKA+T.pdf
- Description:
- IC SUPERVISOR MPU LV SOT23-8
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
MAX6705ASKA+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 (threshold = 2.93V, ±3% over -40°C to +125°C) and is used in critical µP power monitoring for white goods and networking equipment.
For engineers reviewing the MAX6705ASKA+T datasheet, MAX6705ASKA+T pinout, MAX6705ASKA+T application, or MAX6705ASKA+T equivalent, key selection criteria include its fixed 2.93V reset threshold, 140ms reset timeout, open-drain PFO output, WDO watchdog assertion behavior under undervoltage, and compatibility with low-voltage embedded control systems requiring robust brownout protection.
Technical Context
The MAX6705ASKA+T implements a precision voltage-monitoring architecture with three independent comparators: one for VCC (2.93V threshold), one for PFI (0.62V reference), and one for MR input validation. Its reset generator includes a 140ms monostable timeout with hysteresis and immunity to sub-100ns MR glitches.
The integrated watchdog uses a 1.6s timeout period with edge-triggered clearing via WDI transitions; in A-version devices like MAX6705ASKA+T, WDO deasserts immediately upon recovery from undervoltage without waiting for timeout expiration - a key behavioral distinction from non-A variants.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.93V ±3% over -40°C to +125°C - ensures reliable detection of +3.0V supply brownout before system instability. |
| Reset Timeout Period | 140ms minimum - holds µP in reset long enough for power stabilization and clock settling after VCC rise. |
| Watchdog Timeout | 1.6s typical - provides sufficient margin for firmware watchdog servicing intervals in real-time embedded applications. |
| Power-Fail Input Threshold | 0.62V ±9mV - enables precise early-warning detection of secondary supply collapse using external resistor dividers. |
| VCC Operating Range | 1.0V to 5.5V - guarantees functional reset assertion even during deep brownout conditions down to 1V. |
| Supply Current | 9µA typical at VCC < 3.6V - minimizes loading on battery-backed or ultra-low-power auxiliary rails. |
| Reset Output Type | Active-low push-pull - eliminates need for external pull-up resistor and supports direct drive of CMOS reset inputs. |
Pinout & Package
MAX6705ASKA+T is housed in an 8-pin SOT23 package (package code K8+2, outline 21-0078), measuring 2.9mm × 1.6mm × 1.1mm, RoHS-compliant and lead-free (indicated by "+T" suffix).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 MR | Active-low manual reset input | CMOS-compatible input with internal 50kΩ pullup; pulling low forces reset pulse for full timeout duration regardless of VCC level. |
| 2 VCC | Supply voltage and primary reset monitor input | Powers all internal circuitry and serves as reference for main reset comparator; valid operation starts at 1.0V. |
| 3 GND | Ground reference | Common return path for all analog and digital functions; must be low-impedance to ensure accurate threshold detection. |
| 4 PFI | Power-fail voltage monitor input | High-impedance (±200nA leakage) node tied to 0.62V internal reference; accepts external divider for custom trip points. |
| 5 PFO | Power-fail output | Open-drain active-low output; asserts when PFI falls below 0.62V - used for interrupt generation or cascaded reset triggering. |
| 6 WDI | Watchdog input | Edge-sensitive input; rising or falling transition clears watchdog timer; pulses as short as 50ns are recognized. |
| 7 RESET | Active-low reset output | Push-pull driver capable of sinking 3.2mA at VCC ≥ 4.25V; remains asserted for 140ms after VCC rises above threshold. |
| 8 WDO | Watchdog output | Active-low push-pull output; asserts on watchdog timeout or VCC/RST_IN undervoltage; deasserts immediately upon recovery in A-version. |
Key Features
| Feature | Design Value |
|---|---|
| Guaranteed reset validity to VCC = 1V | Ensures deterministic µP reset state even during severe brownout, preventing undefined execution or latch-up. |
| 140ms reset timeout with temperature stability | Monotonic 120–300ms range over -40°C to +125°C avoids premature release in thermal-cycling environments. |
| Independent watchdog output (WDO) | Enables NMI-based fault logging without interfering with primary reset timing - critical for diagnostics in telecom systems. |
| 0.62V precision power-fail comparator | Allows accurate pre-brownout warning for secondary supplies (e.g., I/O rail) using high-value resistors, minimizing quiescent current. |
| Immunity to short VCC transients | Rejects sub-100ns dips in supply voltage, preventing spurious resets in electrically noisy industrial or automotive settings. |
Applications
| White Goods Control | Networking Equipment |
|---|---|
|
Use Scenario: Monitoring +3.0V MCU supply in washing machine mainboard during motor surge-induced line sags. IC Role / Device Role / Timing Role: Primary supervisory IC asserting RESET during brownout and generating PFO interrupt to initiate safe spin-stop sequence. Use Value: Prevents corrupted EEPROM writes and erratic motor control by holding MCU in reset until +3.0V stabilizes post-surge. |
Use Scenario: Power supervision for packet-processing ASIC in enterprise switch operating from +3.3V LDO. IC Role / Device Role / Timing Role: Dual-role supervisor: RESET ensures clean boot; WDO feeds NMI pin to log watchdog timeouts during firmware hangs. Use Value: Enables field-diagnosable failure modes without requiring external logic - reduces MTTR in deployed infrastructure. |
| Intelligent Instrumentation | Critical µP Power Monitoring |
|
Use Scenario: Battery-backed data logger in environmental sensor node where +3.0V rail may dip during RF transmission bursts. IC Role / Device Role / Timing Role: Low-quiescent-current (9µA) supervisor detecting sub-threshold events and triggering graceful shutdown via PFO → MR loop. Use Value: Extends usable battery life while guaranteeing data integrity through controlled save-and-halt before power loss. |
Use Scenario: Supervision of safety-critical microcontroller in medical infusion pump with dual-voltage domain (+3.0V core, +5.0V interface). IC Role / Device Role / Timing Role: Dedicated +3.0V monitor (MAX6705ASKA+T) paired with separate +5.0V supervisor; RESET output drives hardware lockout circuit. Use Value: Meets IEC 62304 Class C requirements by decoupling reset timing from interface rail faults, ensuring core logic remains stable. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6705MSKA+T | Higher reset threshold (4.38V) for +5.0V systems; identical pinout, timing, and feature set. | Designed for 5V µP platforms rather than 3V; not suitable for +3.0V brownout detection. | Select MAX6705MSKA+T only when supervising 5V supplies - mismatched threshold risks missed resets in 3V systems. |
| TPS3808G33DBVR | Fixed 3.3V threshold (±0.5%), 200ms timeout, no PFI/PFO, no WDO - simpler function set. | Lacks power-fail warning and independent watchdog output; limited to basic reset-only use cases. | Choose TPS3808G33DBVR only if PFI/PFO and WDO are unnecessary - MAX6705ASKA+T adds diagnostic capability at minimal BOM cost. |
Compared with MAX6705MSKA+T and TPS3808G33DBVR, MAX6705ASKA+T uniquely delivers 2.93V precision reset + full power-fail warning + independent watchdog output in a single 8-pin SOT23, enabling compact, feature-rich supervision for 3V embedded controllers without sacrificing diagnostic depth.
Availability
MAX6705ASKA+T is available at Aetrix Electronics and suitable for white goods control, networking equipment, intelligent instrumentation, and critical µP power monitoring requiring stable component supply across extended temperature ranges (-40°C to +125°C).
Supply support for MAX6705ASKA+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, integration, and low-power operation.
The MAX6701–MAX6708 family was engineered specifically for multivoltage microprocessor supervision in space-constrained, thermally harsh environments - delivering reset, watchdog, and power-fail functions in sub-3mm² packages with guaranteed operation down to 1V.
FAQ
What is the exact reset threshold voltage of MAX6705ASKA+T and how stable is it over temperature?
The MAX6705ASKA+T has a nominal reset threshold of 2.93V with ±3% tolerance over -40°C to +125°C. Its temperature coefficient is 60ppm/°C, resulting in ≤10mV drift across the full range - sufficient for reliable +3.0V system supervision without calibration. This value is factory-trimmed and guaranteed per device.
Does MAX6705ASKA+T support both push-pull and open-drain reset outputs?
No - MAX6705ASKA+T features an active-low push-pull RESET output only, as indicated by the "S" suffix in its part number (per Threshold Suffix Guide). Open-drain variants use "U" or "W" suffixes (e.g., MAX6705USKA+T). The push-pull configuration eliminates external pull-up components and supports higher sink current (3.2mA at 4.25V).
How does the watchdog behavior of MAX6705ASKA+T differ from non-A versions like MAX6705SKA+T?
In MAX6705ASKA+T (A-version), WDO deasserts immediately when VCC recovers above threshold - no timeout delay required. In non-A versions, WDO remains latched low until a valid WDI edge occurs. This makes MAX6705ASKA+T preferable for applications needing rapid watchdog recovery after transient undervoltage events.
Can MAX6705ASKA+T monitor voltages other than VCC, and how is that implemented?
Yes - MAX6705ASKA+T includes a dedicated PFI input referenced to an internal 0.62V comparator. By connecting an external resistor divider from a secondary supply (e.g., +5.0V I/O rail) to PFI, users can configure early power-fail warning at any desired trip point. PFO then signals the event independently of RESET.
Is the manual reset input (MR) of MAX6705ASKA+T debounced, and what is its glitch rejection capability?
Yes - the MR input incorporates inherent hardware debouncing via the 140ms reset timeout. It also rejects glitches as short as 100ns, preventing false resets from switch bounce or EMI. The internal 50kΩ pullup ensures defined logic state when left unconnected, simplifying PCB layout.
MAX6705ASKA+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:
- Power Supply Monitor
- 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
MAX6705ASKA+T FAQ
1.How can I place an order for MAX6705ASKA+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6705ASKA+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 MAX6705ASKA+T reliable?
The price and inventory of MAX6705ASKA+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6705ASKA+T is usually 5 days.
3.What payment methods are accepted for MAX6705ASKA+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6705ASKA+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6705ASKA+T?
MAX6705ASKA+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6705ASKA+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 MAX6705ASKA+T?
For technical support, including MAX6705ASKA+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6705ASKA+T requirements.
6.How does Aetrix verify that MAX6705ASKA+T is sourced from the original manufacturer or authorized distributors?
All MAX6705ASKA+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 MAX6705ASKA+T meets industry standards.
7.What is the process for return or replacement of MAX6705ASKA+T?
All MAX6705ASKA+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6705ASKA+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 MAX6705ASKA+T part is unused and in its original packaging.
Return procedure for MAX6705ASKA+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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