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Analog Devices Inc./Maxim Integrated MAX6705ASKA
- Part No.:
- MAX6705ASKA
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-8
- Datasheet:
-
MAX6705ASKA.pdf
- Description:
- IC SUPERVISOR MPU
- Quantity:
- Payment:
- Shipping:
Inventory:840
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Product details
Overview
MAX6705ASKA from Maxim Integrated is a single-supply microprocessor supervisory IC in an 8-pin SOT23 package, providing active-low push-pull reset output, independent watchdog timer with 1.6s timeout, adjustable 0.62V power-fail comparator (PFI/PFO), and manual reset input. It monitors +3.08V supply (S-suffix threshold) and guarantees valid reset down to VCC = 1V for reliable µP startup and brownout protection in embedded control systems.
For engineers reviewing the MAX6705ASKA datasheet, MAX6705ASKA pinout, MAX6705ASKA application, or MAX6705ASKA equivalent, this page delivers verified functional identity, confirmed pin roles, exact reset and watchdog timing values, real-world supervision use cases, and two validated alternative parts with documented technical and application differences.
Technical Context
The MAX6705ASKA integrates a precision voltage monitor for VCC only (not triple-voltage), a dedicated 0.62V reference-based power-fail comparator with externally accessible PFI and PFO pins, and a watchdog timer that asserts WDO low upon 1.6s WDI inactivity - independent of reset assertion. Its reset generator holds RESET low for 140ms after VCC rises above the 3.08V threshold.
Unlike MAX6701–MAX6703 variants, it lacks RST_IN1/RST_IN2 inputs; unlike MAX6704/MAX6708, it includes both independent WDO and RESET outputs. The A-version ensures WDO deasserts immediately when VCC recovers above threshold - no timeout delay - and allows MR-driven WDO deassertion, distinguishing it from non-A counterparts.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Reset Threshold | 3.08V (S-suffix), ±3% over -40°C to +125°C - sets precise brownout detection point for +3.3V systems |
| Reset Timeout Period | 140ms (typ), 120–300ms over temperature - ensures µP remains held in reset long enough for stable clock and supply settling |
| Watchdog Timeout | 1.6s (typ), 0.96–2.52s over temperature - provides sufficient margin for µP firmware execution loops without false triggers |
| Power-Fail Threshold | 0.62V (typ), 6mV hysteresis - enables accurate early-warning detection of secondary supply collapse via external resistor divider |
| Supply Current | 9µA (typ) at VCC < 3.6V, no load - supports ultra-low-power battery-backed or energy-harvesting applications |
| Operating Voltage Range | 1.2V to 5.5V - guarantees functional reset assertion even during deep brownout down to 1.2V, with valid output to 1V |
| Output Type | Active-low push-pull RESET and WDO - eliminates need for external pull-up resistors, reduces BOM count and board space |
Pinout & Package
MAX6705ASKA uses an 8-pin SOT23-8 package (JEDEC MO-178, variation BA), measuring 3.00mm × 1.75mm × 1.30mm, with gull-wing leads and RoHS-compliant lead-free option available (+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 assertion and clears watchdog timer |
| 2 VCC | Main supply voltage input | Primary power source and monitored rail; powers internal circuitry and defines reset threshold reference |
| 3 GND | Ground reference | Common return path for all analog and digital functions; must be low-impedance for noise immunity |
| 4 PFI | Power-fail input | High-impedance comparator input referenced to 0.62V; accepts external voltage divider for secondary supply monitoring |
| 5 PFO | Power-fail output | Active-low open-drain output; signals impending supply failure to µP interrupt or sequencer logic |
| 6 WDI | Watchdog input | Edge-sensitive input; rising or falling edge resets internal 1.6s timer; pulses as short as 50ns are detected |
| 7 RESET | Active-low reset output | Push-pull output asserted low during power-up, brownout, MR activation, or watchdog timeout; guaranteed to VCC = 1V |
| 8 WDO | Active-low watchdog output | Independent push-pull output asserted low on watchdog timeout or VCC undervoltage; deasserts immediately on recovery (A-version) |
Key Features
| Feature | Design Value |
|---|---|
| Single-supply supervision with 3.08V threshold | Optimized for +3.3V systems with tight tolerance (±3%) and low tempco (60ppm/°C) - avoids under- or over-reset in industrial temperature range |
| Independent watchdog output (WDO) | Enables NMI-based fault logging without interfering with primary reset state - critical for diagnostics in safety-critical controllers |
| Adjustable power-fail comparator (PFI/PFO) | Allows early warning of auxiliary supply collapse (e.g., I/O rail) using simple resistor divider - supports orderly shutdown before core failure |
| Guaranteed reset validity to VCC = 1V | Ensures deterministic µP behavior during deep brownout or backup-battery switchover - prevents undefined states or code runaway |
| A-version WDO recovery behavior | WDO deasserts instantly when VCC recovers above threshold - eliminates unnecessary system interruption during transient dips |
Applications
| Industrial PLC Controller | Automotive Body Control Module |
|---|---|
Use Scenario: Monitors main 3.3V microcontroller supply and 5V I/O rail in programmable logic controller cabinets exposed to wide ambient temperature swings and EMI. IC Role / Device Role / Timing Role: Provides synchronized power-on reset, brownout detection, and watchdog supervision for ARM Cortex-M4 host MCU. Use Value: Prevents spurious reboots during voltage sags caused by relay switching transients; PFI/PFO enables graceful I/O shutdown before core reset. |
Use Scenario: Supervises 3.3V domain powering CAN transceiver and sensor interface ICs in vehicle door modules subject to load-dump and cold-crank conditions. IC Role / Device Role / Timing Role: Delivers 140ms reset pulse aligned with automotive power sequencing requirements and detects pre-failure of 5V sensor supply via PFI. Use Value: Ensures CAN communication remains stable during battery voltage dips; WDO alerts ECU of firmware hang before safety-critical function loss. |
| Medical Infusion Pump | Smart Energy Meter |
Use Scenario: Secures microcontroller operation in battery-powered infusion pumps where supply integrity directly impacts patient safety. IC Role / Device Role / Timing Role: Generates fail-safe reset during Li-ion battery discharge below 3.0V and monitors pump motor driver supply via PFI. Use Value: Guarantees controlled shutdown before dose delivery error; MR input enables hardware-initiated recalibration sequence. |
Use Scenario: Supervises metrology SoC and isolated RS-485 transceiver in utility-grade meters operating continuously for 15+ years. IC Role / Device Role / Timing Role: Detects AC/DC converter brownout and asserts RESET/WDO to preserve flash data integrity during grid instability. Use Value: Eliminates meter firmware corruption during lightning-induced surges; low 9µA ICC extends supercapacitor hold-up time. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervision applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6705MTA+ | Same SOT23-8 package and A-version logic, but M-suffix = 4.38V reset threshold; otherwise identical electrical specs and pinout | Designed for +5.0V systems instead of +3.3V; unsuitable where 3.08V trip point is required for accurate brownout detection | Select MAX6705MTA+ only when supervising 5V rails; MAX6705ASKA is mandatory for 3.3V systems requiring S-threshold accuracy |
| TPS3808G33DBVR | TI part with 3.3V reset threshold, 200ms timeout, open-drain RESET, no PFI/PFO, no WDO - only RESET and MR functions | Lacks power-fail warning and independent watchdog output; requires external components for PFI-like functionality | Choose TPS3808G33DBVR only if PFI/PFO and WDO are unnecessary; MAX6705ASKA provides full feature set in same footprint |
Compared with MAX6705MTA+, MAX6705ASKA offers correct 3.08V threshold for 3.3V systems and identical A-version WDO behavior; compared with TPS3808G33DBVR, it delivers integrated PFI/PFO and WDO - eliminating three external components and enabling advanced fault response.
Availability
MAX6705ASKA is available at Aetrix Electronics and suitable for industrial PLC controllers, automotive body control modules, medical infusion pumps, and smart energy meters requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6705ASKA 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 semiconductor solutions for industrial, automotive, and computing markets.
The MAX6701–MAX6708 family was engineered specifically for robust, low-component-count microprocessor supervision - delivering precision reset, watchdog, power-fail warning, and manual reset in miniature SOT23 packages for space-constrained embedded systems.
FAQ
What is the exact reset threshold voltage for MAX6705ASKA and how is it specified?
The MAX6705ASKA has a nominal VCC reset threshold of 3.08V, denoted by the 'S' suffix in its part number. This value is guaranteed over the full operating temperature range (-40°C to +125°C) with ±3% tolerance and a temperature coefficient of 60ppm/°C. The threshold is factory-trimmed and tested - not dependent on external components - ensuring consistent brownout detection for +3.3V systems without calibration.
Does MAX6705ASKA support monitoring of multiple supply voltages like VCC, VIO, and VCORE?
No, MAX6705ASKA monitors only the VCC supply voltage. Unlike MAX6701(A)/MAX6702(A)/MAX6703(A) variants, it does not include RST_IN1 or RST_IN2 inputs for dual or triple-voltage supervision. Its design focuses on single-rail +3.3V systems with added PFI capability for one auxiliary supply - making it ideal for applications where only main supply and one secondary rail require supervision.
How does the watchdog behavior differ between MAX6705ASKA and non-A versions like MAX6705SKA?
MAX6705ASKA (A-version) deasserts WDO immediately when VCC recovers above the 3.08V threshold - no timeout delay - and allows MR to deassert WDO. In contrast, MAX6705SKA holds WDO low until a valid WDI edge is detected, even after VCC recovery. This makes the A-version more responsive to transient brownouts and better suited for systems requiring rapid watchdog recovery without software intervention.
Can MAX6705ASKA's PFI input be used to monitor a 5V supply, and what resistor values are needed?
Yes, MAX6705ASKA's PFI input can monitor any supply voltage by using an external resistor divider to scale it down to the 0.62V internal reference. For a 5V supply, a common solution uses R1 = 7.05kΩ and R2 = 1.0kΩ (or ratio ~7.05:1), yielding 0.62V at PFI when Vin = 5V. The high-impedance input (leakage < ±200nA) permits large resistor values to minimize current draw - critical in battery-powered designs.
Is MAX6705ASKA pin-compatible with other devices in the MAX670x family, and which ones share the same pinout?
Yes, MAX6705ASKA shares identical pinout and package (8-pin SOT23-8) with MAX6701–MAX6708 family members including MAX6705SKA, MAX6705MTA+, MAX6704KA, and MAX6708KA. All use the same MR/VCC/GND/PFI/PFO/WDI/RESET/WDO assignment. However, functional differences exist - e.g., MAX6704 lacks WDO, MAX6708 lacks WDI - so pin compatibility does not imply functional interchangeability without circuit review.
MAX6705ASKA 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:
- 2.93V
- 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
MAX6705ASKA FAQ
1.How can I place an order for MAX6705ASKA through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6705ASKA 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 reliable?
The price and inventory of MAX6705ASKA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6705ASKA is usually 5 days.
3.What payment methods are accepted for MAX6705ASKA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6705ASKA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6705ASKA?
MAX6705ASKA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6705ASKA 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?
For technical support, including MAX6705ASKA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6705ASKA requirements.
6.How does Aetrix verify that MAX6705ASKA is sourced from the original manufacturer or authorized distributors?
All MAX6705ASKA 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 meets industry standards.
7.What is the process for return or replacement of MAX6705ASKA?
All MAX6705ASKA units undergo pre-shipment inspection (PSI). If there is an issue with MAX6705ASKA, 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 part is unused and in its original packaging.
Return procedure for MAX6705ASKA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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