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Analog Devices Inc./Maxim Integrated MAX6705ARKA
- Part No.:
- MAX6705ARKA
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-8
- Datasheet:
-
MAX6705ARKA.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL SOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:1,378
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Product details
Overview
MAX6705ARKA from Maxim Integrated is a single-supply microprocessor supervisory circuit in an 8-pin SOT23 package, providing active-low push-pull reset output, independent watchdog timer with dedicated WDO pin, adjustable power-fail comparator (PFI/PFO), and manual reset input. It monitors +3.3V systems with 3.08V reset threshold, 140ms reset timeout, and operates down to VCC = 1V.
For engineers reviewing the MAX6705ARKA datasheet, MAX6705ARKA pinout, MAX6705ARKA application, or MAX6705ARKA equivalent, this device supports critical µP power monitoring in automotive ECUs, industrial controllers, and networking equipment where reliable brownout detection, watchdog supervision, and early power-fail warning are required.
Technical Context
The MAX6705ARKA integrates four core functions: a precision voltage monitor for VCC with fixed 3.08V threshold (R-suffix), a 1.6s watchdog timer with independent open-drain WDO output, a 0.62V reference-based power-fail comparator with externally adjustable PFI input and active-low PFO output, and a CMOS-compatible manual reset input with internal 50kΩ pullup.
Its reset generator asserts RESET low during power-up (valid down to VCC = 1V), brownout, or MR assertion, holding for 140ms after recovery; the watchdog clears on any WDI edge or system reset and latches WDO low only on timeout - unlike non-A versions, WDO deasserts immediately when undervoltage conditions clear.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 3.08V (R-suffix) at VCC falling; ensures reliable reset assertion before +3.3V supply drops below logic-safe level. |
| Reset Timeout Period | 140ms typical; guarantees µP remains held in reset long enough to stabilize after power recovery. |
| Watchdog Timeout | 1.6s typical; provides sufficient margin for µP firmware execution cycles while detecting lockups. |
| Power-Fail Threshold | 0.62V internal reference; enables precise early-warning detection of secondary supply collapse via external resistor divider. |
| Supply Voltage Range | 1.2V to 5.5V; supports operation during deep brownout and compatibility with wide-input DC-DC regulators. |
| Reset Output Type | Active-low push-pull; drives µP reset pin directly without external pullup, sinking ≥1.2mA at VCC ≥ 2.55V. |
| Operating Temperature | -40°C to +125°C; qualified for under-hood automotive and industrial control environments. |
Pinout & Package
Package: 8-pin SOT23-8 (JEDEC MO-178, variant K8-2), 2.80mm × 2.90mm × 1.45mm body, lead-free option available (+T suffix).
| 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, also clears watchdog when asserted. |
| 2 VCC | Supply Voltage Input | Primary power rail input; powers internal comparators, timer, and push-pull outputs; reset valid down to 1.0V. |
| 3 GND | Ground Reference | System ground return for all internal circuits and output drivers. |
| 4 PFI | Power-Fail Input | High-impedance comparator input referenced to 0.62V; accepts voltage divider from secondary supply for early warning. |
| 5 PFO | Power-Fail Output | Active-low open-drain output; asserts when PFI falls below 0.62V, usable as interrupt or to trigger backup sequencing. |
| 6 WDI | Watchdog Input | Edge-sensitive input; any rising or falling transition resets 1.6s timer; pulses as short as 50ns are detected. |
| 7 RESET | Reset Output | Active-low push-pull output; drives µP reset pin directly; guaranteed VOL ≤ 0.3V at ISINK = 1.2mA (VCC ≥ 2.55V). |
| 8 WDO | Watchdog Output | Active-low open-drain output; asserts only on watchdog timeout (not on undervoltage); deasserts immediately upon WDI edge or MR low. |
Key Features
| Feature | Design Value |
|---|---|
| Guaranteed reset validity to VCC = 1V | Ensures deterministic reset behavior during deep brownout, preventing µP runaway before full power collapse. |
| Independent watchdog output (WDO) | Enables NMI-based fault logging without interfering with primary reset state; avoids race conditions in safety-critical firmware. |
| Adjustable power-fail comparator | Allows precise early-warning threshold setting for secondary supplies (e.g., 1.8V I/O rail) using two external resistors. |
| Immunity to short VCC transients | Rejects <100ns glitches on VCC, preventing spurious resets in electrically noisy environments like motor drives or automotive CAN nodes. |
| A-version watchdog behavior | WDO deasserts immediately when VCC recovers - unlike standard versions - enabling faster system recovery after transient faults. |
Applications
| Automotive Engine Control Unit (ECU) | Industrial PLC Controller |
|---|---|
Use Scenario: Monitoring 3.3V microcontroller supply and 5V sensor interface rail in under-hood ECU exposed to load dump and cold cranking. IC Role / Device Role / Timing Role: Primary supervisor asserting reset during battery sag (<2.8V), triggering watchdog if firmware hangs, and warning of 5V rail collapse via PFI divider. Use Value: Prevents erratic ECU behavior during ISO 7637-2 pulse 4 (cold crank) by holding reset until VCC stabilizes above 3.08V for 140ms. |
Use Scenario: Ensuring deterministic startup and runtime supervision of ARM-based controller in modular I/O chassis with multiple isolated DC-DC rails. IC Role / Device Role / Timing Role: Single-chip solution for VCC reset, watchdog supervision, and early warning of auxiliary 2.5V FPGA configuration supply failure. Use Value: Eliminates need for discrete RC reset and separate watchdog IC, reducing BOM count and PCB area in space-constrained DIN-rail mount designs. |
| Networking Switch Management ASIC | White Goods Main Control Board |
Use Scenario: Supervising 3.3V management processor in Layer 2 switch requiring fail-safe boot and runtime health monitoring. IC Role / Device Role / Timing Role: Generates clean reset pulse on power-up, detects firmware lockup via WDI toggling, and signals 1.2V core rail collapse via PFI network. Use Value: Enables graceful shutdown and log capture via PFO-triggered interrupt before main supply fails, improving field diagnostics. |
Use Scenario: Power monitoring for 3.3V MCU in washing machine main board subject to line surges and compressor-induced transients. IC Role / Device Role / Timing Role: Provides glitch-immune reset during motor startup, watchdog supervision of motor control loop, and brownout warning for display backlight dimming. Use Value: Extends appliance lifetime by preventing EEPROM corruption during 100ms brownouts common in residential power grids. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervision applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6705MTA+ | 3.38V reset threshold (M-suffix), RoHS-compliant +T packaging | Suitable for +3.3V systems requiring tighter 3.38V trip point and lead-free compliance | Select when higher reset threshold improves noise margin against 3.3V supply ripple. |
| MAX6316HPUK33+T | 3.3V fixed threshold, no watchdog or PFI/PFO; SOT23-5 package | Limited to basic reset-only applications without supervision features | Choose only if design requires minimal footprint and excludes watchdog/power-fail functions. |
Compared with MAX6705MTA+, the MAX6705ARKA offers lower reset threshold (3.08V vs. 3.38V) for earlier brownout response in marginal 3.3V supplies; compared with MAX6316HPUK33+T, it adds watchdog supervision and power-fail warning - critical for systems requiring runtime fault detection beyond power-on reset.
Availability
MAX6705ARKA is available at Aetrix Electronics and suitable for automotive engine control units, industrial programmable logic controllers, and networking equipment requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6705ARKA 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, automotive, and communications applications.
The MAX6701–MAX6708 family was engineered to replace discrete reset circuits and multiple supervisory ICs with a single, small-footprint device delivering reset, watchdog, power-fail warning, and manual reset in one SOT23-8 package.
FAQ
What is the reset threshold voltage for MAX6705ARKA?
The MAX6705ARKA has a factory-trimmed reset threshold of 3.08V (R-suffix) for the VCC supply, specified over -40°C to +125°C. This value ensures reliable reset assertion before a nominal +3.3V rail falls below the minimum operating voltage of most 3.3V microcontrollers. The threshold exhibits ±30mV initial accuracy and 60ppm/°C temperature coefficient.
Does MAX6705ARKA support operation below 2.0V supply?
Yes, MAX6705ARKA guarantees valid reset output down to VCC = 1.0V, with functional operation supported from 1.2V to 5.5V. At VCC = 1.2V, the device draws only 9µA typical supply current and maintains accurate 3.08V threshold detection - enabling use in ultra-low-voltage backup domains or deep-brownout recovery sequences.
How does the watchdog behavior differ between MAX6705ARKA and non-A versions?
The MAX6705ARKA watchdog output (WDO) deasserts immediately when VCC recovers above threshold, whereas non-A versions require a WDI edge to clear WDO after undervoltage. Additionally, MAX6705ARKA allows MR low to deassert WDO - enabling hardware-controlled watchdog reset without µP intervention - a key distinction confirmed in the Standard- vs. A-Version Comparison section.
Can MAX6705ARKA monitor voltages other than VCC?
Yes, MAX6705ARKA includes a dedicated PFI pin with 0.62V internal reference, allowing monitoring of secondary supplies (e.g., 1.8V, 2.5V, 5V) via external resistor dividers. The PFO output asserts low when the divided voltage falls below 0.62V, providing early warning of supply collapse before VCC fails - a capability confirmed in the Pin Description and Applications Information sections.
What package and environmental specifications apply to MAX6705ARKA?
MAX6705ARKA uses an 8-pin SOT23-8 package (JEDEC MO-178, variation K8-2), measuring 2.80mm × 2.90mm × 1.45mm. It is rated for -40°C to +125°C operation and available in both leaded (-T) and RoHS-compliant lead-free (+T) variants. The "KA" in the part number denotes the SOT23-8 package, and "R" specifies the 3.08V reset threshold.
MAX6705ARKA 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:
- 2.63V, 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
MAX6705ARKA FAQ
1.How can I place an order for MAX6705ARKA through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6705ARKA 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 MAX6705ARKA reliable?
The price and inventory of MAX6705ARKA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6705ARKA is usually 5 days.
3.What payment methods are accepted for MAX6705ARKA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6705ARKA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6705ARKA?
MAX6705ARKA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6705ARKA 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 MAX6705ARKA?
For technical support, including MAX6705ARKA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6705ARKA requirements.
6.How does Aetrix verify that MAX6705ARKA is sourced from the original manufacturer or authorized distributors?
All MAX6705ARKA 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 MAX6705ARKA meets industry standards.
7.What is the process for return or replacement of MAX6705ARKA?
All MAX6705ARKA units undergo pre-shipment inspection (PSI). If there is an issue with MAX6705ARKA, 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 MAX6705ARKA part is unused and in its original packaging.
Return procedure for MAX6705ARKA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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