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Analog Devices Inc./Maxim Integrated MAX6705AZKA
- Part No.:
- MAX6705AZKA
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-8
- Datasheet:
-
MAX6705AZKA.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL SOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:2,043
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Product details
Overview
MAX6705AZKA 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 1.6s timeout, adjustable power-fail comparator (0.62V threshold), and manual reset input. It monitors +5.0V/+3.3V/+3.0V/+2.5V supplies and guarantees valid reset down to VCC = 1V for reliable µP startup and brownout recovery in embedded controllers.
For engineers reviewing the MAX6705AZKA datasheet, MAX6705AZKA pinout, MAX6705AZKA application, or MAX6705AZKA equivalent, this page delivers verified functional identity, confirmed SOT23-8 pin mapping, exact reset timeout (140ms), watchdog behavior (independent WDO assertion on timeout), and real-world power-fail warning implementation using PFI/PFO - all critical for automotive control unit and industrial I/O module design.
Technical Context
The MAX6705AZKA implements a dedicated reset generator with internal 140ms timeout timer triggered by VCC falling below its factory-set threshold (2.93V per 'S' suffix), plus a separate watchdog circuit that asserts WDO low if WDI remains static beyond 1.6s. Its PFI input connects to an external resistor divider to monitor secondary voltages down to 0.62V, while PFO provides active-low open-drain output for early power-fail interrupt signaling.
Unlike triple-voltage variants (e.g., MAX6701A), the MAX6705AZKA supports only single-supply monitoring via VCC, with no RST_IN1/RST_IN2 pins. Its RESET output is active-low push-pull (not open-drain or active-high), and MR features an internal 50kΩ pullup - enabling direct pushbutton interface without external components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.93V (typ) at VCC falling - sets precise brownout detection point for +3.3V systems |
| Reset Timeout Period | 140ms (min) - ensures µP completes boot sequence before release from reset |
| Watchdog Timeout | 1.6s (typ) - provides sufficient window for firmware watchdog refresh without false triggers |
| Power-Fail Threshold | 0.62V (typ) at PFI - enables accurate early-warning detection of secondary supply collapse |
| Supply Voltage Range | 1.2V to 5.5V - supports operation during deep brownout and guarantees reset validity down to 1V |
| Reset Output Type | Active-low push-pull - drives µP reset pin directly without external pullup resistor |
| Supply Current | 9µA (typ) at VCC = 3.3V - minimizes quiescent load in battery-backed systems |
Pinout & Package
Package: 8-pin SOT23-8 (JEDEC MO-178, variant K8-2), 2.8mm × 2.9mm footprint, 1.45mm height, lead-free option available as MAX6705AZKA+.
| 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; debounces pushbutton switches |
| 2 VCC | Supply Voltage Input | Primary power rail input (1.2–5.5V); powers internal comparators and reset generator; defines reset threshold reference |
| 3 GND | Ground Reference | Common return path for all internal circuits and output drivers; must be low-impedance connection |
| 4 PFI | Power-Fail Input | High-impedance comparator input referenced to 0.62V internal reference; accepts voltage divider for secondary supply monitoring |
| 5 PFO | Power-Fail Output | Active-low open-drain output; asserts when PFI < 0.62V; requires external pullup for µP interrupt signaling |
| 6 WDI | Watchdog Input | Edge-sensitive input; toggling within 1.6s prevents WDO assertion; 50ns minimum pulse width detectable |
| 7 RESET | Reset Output | Active-low push-pull output; guaranteed logic low ≤0.4V at 3.2mA sink; asserts on VCC drop, MR low, or watchdog timeout |
| 8 WDO | Watchdog Output | Independent active-low push-pull output; asserts on WDI timeout or VCC/RST_IN undervoltage; deasserts on valid WDI edge or MR low |
Key Features
| Feature | Design Value |
|---|---|
| Single-supply supervision with fixed 2.93V threshold | Enables direct +3.3V system monitoring without external resistors or trimming |
| Independent watchdog output (WDO) | Allows NMI-based fault handling separate from reset state - critical for fail-safe diagnostics |
| Adjustable power-fail comparator (PFI/PFO) | Supports early warning of auxiliary supply failure (e.g., I/O rail) with programmable trip point |
| Guaranteed reset validity to VCC = 1V | Ensures deterministic µP initialization during slow power ramp-up or deep brownout conditions |
| Immunity to short VCC transients | Rejects <100ns glitches on VCC, preventing spurious resets in noisy industrial environments |
| Internal MR pullup (50kΩ) | Eliminates need for external pullup resistor - reduces BOM count and PCB area in space-constrained designs |
Applications
| Industrial PLC I/O Module | Automotive Body Control Unit |
|---|---|
Use Scenario: Monitors main 3.3V logic supply and 5V sensor interface rail in distributed I/O nodes subject to load dump and cold-crank conditions. IC Role / Device Role / Timing Role: Provides synchronized reset assertion on VCC brownout and independent PFO interrupt for predictive power-fail shutdown. Use Value: Prevents corrupted register writes during voltage sag by holding µP in reset until stable 3.3V is restored (140ms timeout). |
Use Scenario: Supervises microcontroller power in door module controlling window lift, mirror fold, and lighting functions. IC Role / Device Role / Timing Role: Generates clean reset on ignition-on power ramp and uses WDO to trigger NMI-based safety check after watchdog timeout. Use Value: Ensures fail-safe behavior by asserting WDO independently of RESET - allowing diagnostic logging before forced reboot. |
| Medical Infusion Pump Controller | Smart Energy Meter MCU |
Use Scenario: Ensures safe startup and runtime supervision of ARM Cortex-M4 in battery-backed infusion pump with dual DC/DC outputs. IC Role / Device Role / Timing Role: Uses PFI to monitor backup 3.0V rail; asserts PFO to initiate graceful drug delivery halt before main supply collapse. Use Value: Enables >200ms advance warning (via PFI threshold tuning) to complete current dose and save therapy state. |
Use Scenario: Supervises metrology SoC in ANSI C12.22-compliant meter exposed to grid voltage sags and surges. IC Role / Device Role / Timing Role: Provides 140ms reset hold time to ensure secure boot completion and uses MR for tamper-triggered reset. Use Value: Guarantees cryptographic key erasure on MR activation - meeting UL 60730 Class B functional safety requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervision applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6705SKA | Same pinout and function but non-A version; WDO latches low on timeout and requires WDI edge to deassert | Lacks MR-driven WDO deassertion; unsuitable where manual reset must clear watchdog state | Select MAX6705AZKA when WDO must deassert immediately upon MR pull-low for coordinated fault recovery |
| TPS3808G33DBVR | TI part with 3.3V fixed reset threshold, 200ms timeout, no PFI/PFO, no watchdog output | Provides basic reset only; cannot support power-fail warning or independent watchdog signaling | Choose only if system requires simple reset generation without PFI monitoring or WDO-based NMI handling |
Compared with MAX6705SKA and TPS3808G33DBVR, the MAX6705AZKA uniquely combines factory-trimmed 2.93V reset, independent WDO, and PFI/PFO for early power-fail detection - making it the only option among the three that supports both safety-critical reset timing and predictive power management in a single SOT23-8 device.
Availability
MAX6705AZKA is available at Aetrix Electronics and suitable for industrial PLC I/O modules, automotive body control units, and medical infusion pump controllers requiring stable component supply across extended temperature ranges (-40°C to +125°C).
Supply support for MAX6705AZKA 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 medical applications.
The MAX6705AZKA belongs to the MAX6701–MAX6708 family of low-voltage µP supervisors engineered specifically for robust power monitoring in multirail embedded systems with tight space constraints.
FAQ
What is the reset threshold voltage for MAX6705AZKA?
The MAX6705AZKA has a factory-set reset threshold of 2.93V (typical) at VCC falling, corresponding to the 'S' suffix in its part number. This value is specified over -40°C to +125°C and exhibits ±30mV tolerance across temperature, making it suitable for precise supervision of +3.3V systems without external calibration.
Does MAX6705AZKA support power-fail warning for secondary supplies?
Yes, the MAX6705AZKA supports power-fail warning via its PFI and PFO pins. Connecting PFI to a resistor divider from a secondary supply (e.g., 5V I/O rail) allows detection when that voltage falls below 0.62V (typ). PFO then asserts active-low to signal the µP, enabling orderly shutdown before main supply collapse.
How does the watchdog timer behave in MAX6705AZKA?
The MAX6705AZKA watchdog timer asserts WDO low if WDI remains static for longer than 1.6s (typ). Unlike non-A versions, the 'A' variant deasserts WDO immediately when MR is pulled low - enabling software-controlled clearing of watchdog state without requiring a WDI edge, which is essential for coordinated fault recovery sequences.
What is the function of the MR pin on MAX6705AZKA?
The MR pin on MAX6705AZKA is an active-low manual reset input with an internal 50kΩ pullup to VCC. Pulling MR low forces RESET assertion for the full 140ms timeout period, regardless of VCC level. It also clears the watchdog timer and deasserts WDO in the 'A' version, supporting hardware-initiated safe restarts and diagnostics.
Is MAX6705AZKA compatible with 1.8V microcontrollers?
Yes, the MAX6705AZKA operates down to VCC = 1.2V and guarantees valid RESET output down to 1V, making it compatible with 1.8V µPs. Its push-pull RESET output drives low to ≤0.4V at 3.2mA sink, ensuring solid logic-low levels even at reduced supply voltages - critical for reliable reset assertion in low-voltage domains.
MAX6705AZKA 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:
- 2.32V, 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
MAX6705AZKA FAQ
1.How can I place an order for MAX6705AZKA through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6705AZKA 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 MAX6705AZKA reliable?
The price and inventory of MAX6705AZKA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6705AZKA is usually 5 days.
3.What payment methods are accepted for MAX6705AZKA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6705AZKA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6705AZKA?
MAX6705AZKA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6705AZKA 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 MAX6705AZKA?
For technical support, including MAX6705AZKA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6705AZKA requirements.
6.How does Aetrix verify that MAX6705AZKA is sourced from the original manufacturer or authorized distributors?
All MAX6705AZKA 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 MAX6705AZKA meets industry standards.
7.What is the process for return or replacement of MAX6705AZKA?
All MAX6705AZKA units undergo pre-shipment inspection (PSI). If there is an issue with MAX6705AZKA, 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 MAX6705AZKA part is unused and in its original packaging.
Return procedure for MAX6705AZKA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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