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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:
- MAX6705 LOW-VOLTAGE, MICROPROCES
- Quantity:
- Payment:
- Shipping:
Inventory:2,016
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Product details
Overview
MAX6705ARKA+ from Maxim Integrated is a low-voltage microprocessor supervisory circuit in an 8-pin SOT23 package, providing active-low push-pull reset output, independent watchdog timer with 1.6s timeout, 0.62V power-fail comparator input (PFI), and active-low manual reset input (MR). It monitors single-supply voltage (2.93V threshold for 'R' suffix), asserts reset during power-up/down/brownout, and supports critical µP power monitoring in embedded controllers.
For engineers reviewing the MAX6705ARKA+ datasheet, MAX6705ARKA+ pinout, MAX6705ARKA+ application, or MAX6705ARKA+ equivalent, key selection factors include its guaranteed reset validity down to VCC = 1V, immunity to short falling VCC transients, 140ms reset timeout delay, and compatibility with +5.0V/+3.3V/+3.0V/+2.5V supply rails.
Technical Context
The MAX6705ARKA+ implements a precision undervoltage detection architecture using an internal 0.62V reference to compare VCC against a resistor-divider–set threshold. Its reset generator holds RESET low for ≥140ms after VCC rises above threshold, while the watchdog timer requires WDI toggling within 1.6s to prevent WDO assertion.
Unlike triple-voltage variants (e.g., MAX6701A), the MAX6705ARKA+ monitors only VCC - not RST_IN1/RST_IN2 - and features dedicated PFI/PFO pins for external power-fail warning generation. Its A-version WDO deasserts immediately upon VCC recovery (no timeout delay), distinguishing it from non-A counterparts.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.93V (R-suffix), ±1.5% accuracy over -40°C to +125°C - sets precise brownout detection point for +3.0V systems |
| Reset Timeout Delay | 140ms minimum - ensures µP initialization completes before release from reset |
| Watchdog Timeout | 1.6s typical - provides sufficient window for firmware watchdog servicing without false triggers |
| Supply Voltage Range | 1.2V to 5.5V - enables operation across wide VCC conditions including deep brownout recovery |
| PFI Threshold | 0.62V ±6mV - allows accurate external voltage monitoring via resistive divider |
| Reset Output Type | Active-low push-pull - drives logic directly without external pull-up; sinks 3.2mA at VCC ≥ 4.25V |
| Operating Temp | -40°C to +125°C - qualified for automotive under-hood and industrial control environments |
Pinout & Package
Package: 8-pin SOT23-8 (JEDEC MO-178 BA variation, 1.95mm × 2.80mm body, 0.65mm pitch).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 MR | Manual Reset Input | CMOS-compatible active-low input with 50kΩ internal pullup; forces reset when pulled low; debounces pushbutton switches |
| 2 VCC | Supply Voltage Input | Primary power rail input; powers internal comparators, reset generator, and push-pull outputs; valid down to 1.2V |
| 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 external voltage divider for custom trip points |
| 5 PFO | Power-Fail Output | Active-low open-drain output; asserts when PFI < 0.62V; requires external pullup for interrupt signaling |
| 6 WDI | Watchdog Input | Edge-sensitive input; rising/falling transitions clear watchdog timer; 50ns pulse width detectable |
| 7 RESET | Reset Output | Active-low push-pull output; guaranteed low ≤0.4V at 3.2mA sink; remains asserted ≥140ms after VCC recovery |
| 8 WDO | Watchdog Output | Active-low push-pull output; asserts on WDI timeout or VCC undervoltage; deasserts immediately upon VCC recovery (A-version behavior) |
Key Features
| Feature | Design Value |
|---|---|
| Guaranteed reset validity to VCC = 1V | Ensures deterministic reset state during deep brownout recovery, preventing µP lockup |
| Immunity to short falling VCC transients | Rejects sub-100ns supply glitches, eliminating spurious resets in noisy power environments |
| Independent PFI/PFO comparator | Enables early power-fail warning generation without affecting reset timing or requiring µP intervention |
| 140ms reset timeout with temperature stability | Minimizes risk of premature release from reset across full -40°C to +125°C operating range |
| A-version WDO deassertion on VCC recovery | Eliminates watchdog-induced NMI conflicts during power restoration, simplifying fault-handling logic |
Applications
| Industrial PLC Controller | Automotive Body Control Module |
|---|---|
Use Scenario: Monitoring 3.3V I/O supply in programmable logic controller with watchdog supervision of firmware execution. IC Role / Device Role / Timing Role: MAX6705ARKA+ asserts RESET during 3.3V brownout and generates NMI via WDO if firmware fails to service watchdog. Use Value: Prevents corrupted I/O state by ensuring clean restart on supply anomaly and detecting software hangs independently of power events. | Use Scenario: Supervising 3.0V microcontroller supply in vehicle door module exposed to load-dump and cold-crank conditions. IC Role / Device Role / Timing Role: MAX6705ARKA+ holds RESET low until 3.0V stabilizes post-cold-crank and uses PFI to trigger orderly shutdown before battery voltage collapse. Use Value: Guarantees µP reset integrity down to 1.2V VCC and provides predictive power-fail warning via PFO interrupt, meeting ISO 16750-2 requirements. |
| Network Router Management CPU | Smart Energy Meter MCU |
Use Scenario: Ensuring reliable boot sequence for ARM-based management processor powered from isolated DC-DC converter. IC Role / Device Role / Timing Role: MAX6705ARKA+ monitors converter output, asserts RESET on dropout, and uses MR for remote reset via GPIO-controlled transistor. Use Value: Eliminates need for external RC reset circuitry; 140ms timeout aligns with ARM boot ROM initialization timing. | Use Scenario: Supervising 3.0V metrology SoC supply in electricity meter subject to rapid AC line interruptions. IC Role / Device Role / Timing Role: MAX6705ARKA+ detects VCC dip below 2.93V, asserts RESET, and uses PFI to initiate flash save operations before power loss. Use Value: Enables data retention during microsecond-scale outages via PFO-triggered interrupt, meeting IEC 62053-21 data integrity requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6705MTA+ | 3.08V reset threshold (M-suffix) vs. 2.93V (R-suffix); otherwise identical pinout, features, and timing | Suitable for +3.3V systems requiring higher trip point to avoid false resets near regulator tolerance limits | Select MAX6705MTA+ when system VCC nominal is 3.3V ±3% and brownout margin must exceed 200mV |
| TPS3808G33DBVR | TI part with 3.08V threshold, 200ms reset delay, no PFI/PFO, no watchdog output - only reset + MR functions | Lacks power-fail warning and independent watchdog output; requires external circuitry for PFI-equivalent functionality | Choose TPS3808G33DBVR only if PFI/PFO and WDO are unused and longer reset timeout is acceptable |
Compared with MAX6705MTA+, the MAX6705ARKA+ offers tighter brownout detection for 3.0V rails; compared with TPS3808G33DBVR, it delivers integrated power-fail warning and independent watchdog signaling - reducing BOM count and PCB area in space-constrained designs.
Availability
MAX6705ARKA+ is available at Aetrix Electronics and suitable for industrial PLC controllers, automotive body control modules, network router management CPUs, and smart energy meter MCUs requiring stable component supply across extended temperature ranges.
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 power management, sensing, and interface applications.
The MAX6701–MAX6708 family was engineered specifically for robust microprocessor supervision in harsh environments, integrating reset, watchdog, power-fail warning, and manual reset in ultra-small SOT23 packages.
FAQ
What is the reset threshold voltage for MAX6705ARKA+?
The MAX6705ARKA+ has a factory-trimmed reset threshold of 2.93V (R-suffix), specified with ±1.5% accuracy over -40°C to +125°C. This value applies to the primary VCC monitor; PFI uses a fixed 0.62V internal reference for external voltage monitoring.
Does MAX6705ARKA+ support operation below 2.5V supply voltage?
Yes, MAX6705ARKA+ operates from 1.2V to 5.5V. Its reset function remains valid down to VCC = 1V, and the 2.93V threshold detector functions correctly across the full 1.2V–5.5V range - enabling use in low-voltage battery-powered systems.
How does the watchdog timer in MAX6705ARKA+ differ from non-A versions?
In MAX6705ARKA+, the WDO output deasserts immediately when VCC recovers above threshold - no timeout delay. In non-A versions, WDO remains latched low until a valid WDI transition occurs. This A-version behavior prevents NMI conflicts during power restoration.
Can MAX6705ARKA+ monitor multiple supply voltages simultaneously?
No, MAX6705ARKA+ monitors only the VCC supply. Unlike MAX6701A/MAX6702A variants, it lacks RST_IN1 and RST_IN2 pins. For triple-voltage monitoring, consider MAX6701ARKA+ or MAX6702ARKA+ instead.
What is the function of the PFI and PFO pins on MAX6705ARKA+?
PFI is a high-impedance input referenced to an internal 0.62V comparator; connecting it to a resistor divider enables monitoring of secondary voltages. PFO is an active-low open-drain output that asserts when PFI falls below 0.62V - used for early power-fail interrupts to trigger data save routines.
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:
- Power Supply Monitor
- Number of Voltages Monitored:
- 2
- Voltage - Threshold:
- 2.63V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- 120ms 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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