My Inquiry
My Account
Analog Devices Inc./Maxim Integrated MAX6705SKA+T
- Part No.:
- MAX6705SKA+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-8
- Datasheet:
-
MAX6705SKA+T.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL SOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:10,454
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
MAX6705SKA+T 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 +3.3V systems (3.00V–3.15V reset threshold), guarantees reset validity down to VCC = 1V, and is used in critical µP power monitoring for industrial controllers and networking equipment.
For engineers reviewing the MAX6705SKA+T datasheet, MAX6705SKA+T pinout, MAX6705SKA+T application, or MAX6705SKA+T equivalent, this page delivers verified specifications, functional context, real-world use cases, and validated alternative options - all grounded in Maxim's official documentation for the MAX6705A family with S (3.08V) threshold and +T lead-free SOT23 packaging.
Technical Context
The MAX6705SKA+T implements a dedicated reset generator with internal 140ms timeout delay, a separate watchdog circuit that asserts WDO low upon 1.6s WDI inactivity, and an uncommitted comparator with 0.62V reference for flexible power-fail warning. Its reset logic responds to VCC falling below the 3.08V threshold (±3% over –40°C to +125°C), MR assertion, or watchdog timeout - with no dependency on external timing components.
All outputs (RESET, WDO, PFO) are push-pull active-low; RESET remains asserted for ≥140ms after VCC recovery, and the device draws only 9–20µA supply current across its 1.2V–5.5V operating range. The A-version ensures WDO deasserts immediately when undervoltage clears - unlike non-A versions where WDO latches until WDI toggles.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 3.08V nominal (S-suffix), ±3% over –40°C to +125°C - sets precise brownout detection point for +3.3V rails |
| Reset Timeout Delay | 140ms minimum - ensures µP reset pulse meets minimum duration requirements for reliable boot initialization |
| Watchdog Timeout | 1.6s typical - provides sufficient window for firmware watchdog servicing without false triggers |
| Power-Fail Threshold | 0.62V internal reference - enables accurate early-warning detection of secondary supply collapse via external resistor divider |
| Supply Voltage Range | 1.2V to 5.5V - supports operation during deep brownout while maintaining guaranteed reset assertion down to VCC = 1V |
| Supply Current | 9µA typical at VCC < 3.6V - enables ultra-low-power supervision in battery-backed or energy-sensitive systems |
| Output Type | Active-low push-pull RESET and WDO - eliminates need for external pull-up resistors and ensures fast, rail-to-rail drive capability |
Pinout & Package
MAX6705SKA+T is housed in an 8-pin SOT23 package (package code K8+2), with 0.65mm pitch, 2.9mm × 1.6mm footprint, and thermal pad option. Pin functions are electrically validated per Maxim's MAX6705A-07A datasheet Rev 4 (2014).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 MR | Active-low manual reset input | CMOS-compatible input with 50kΩ internal pullup; pulling low forces full reset sequence including WDO assertion (A-version) |
| 2 VCC | Supply voltage and primary reset monitor input | Powers all internal circuitry and serves as main reset trigger source; valid operation starts at VCC = 1.2V |
| 3 GND | Ground reference | Common return path for all analog and digital functions; must be low-impedance for noise immunity |
| 4 PFI | Power-fail voltage monitor input | High-impedance node referenced to 0.62V internal comparator; accepts external divider for custom trip points |
| 5 PFO | Power-fail output | Active-low push-pull output asserting when PFI < 0.62V - directly drives µP interrupt or secondary supervisor |
| 6 WDI | Watchdog input | Edge-sensitive input; rising or falling edge resets 1.6s watchdog timer - pulses as short as 50ns are detected |
| 7 RESET | Active-low reset output | Push-pull driver asserting low during power-up, brownout, MR activation, or watchdog timeout (A-version only) |
| 8 WDO | Active-low watchdog output | Independent push-pull output asserting low on watchdog timeout or VCC/RST_IN undervoltage - deasserts immediately when condition clears (A-version) |
Key Features
| Feature | Design Value |
|---|---|
| Guaranteed reset validity to VCC = 1V | Ensures deterministic reset behavior even during severe brownout conditions before system power collapse |
| 140ms reset timeout with temperature stability | Provides consistent, production-tested reset pulse width across –40°C to +125°C without external RC components |
| Independent watchdog output (WDO) | Enables NMI-based fault handling separate from reset domain - critical for real-time diagnostics and safe shutdown |
| Adjustable 0.62V power-fail comparator | Allows precise early-warning detection of auxiliary supply failure using only two external resistors - no additional ICs required |
| Immunity to short VCC transients | Rejects sub-10µs supply dips (e.g., switching noise), preventing spurious resets in electrically noisy environments |
| Lead-free +T packaging | RoHS-compliant SOT23 construction with matte tin finish - qualified for industrial temperature range (–40°C to +125°C) |
Applications
| Industrial Controllers | Networking Equipment |
|---|---|
Use Scenario: PLCs and remote I/O modules require reliable power sequencing and fault recovery during unstable AC line conditions or backup battery switchover. IC Role / Device Role / Timing Role: MAX6705SKA+T acts as primary power supervisor - monitoring main 3.3V rail, generating reset pulse, and signaling impending power loss via PFO to initiate graceful shutdown. Use Value: Prevents firmware corruption and state machine lockup by enforcing minimum reset pulse width and detecting brownout 100ms before VCC dropout. |
Use Scenario: Ethernet switches and routers use multiple voltage rails; secondary supplies (e.g., PHY bias) may fail independently of main 3.3V. IC Role / Device Role / Timing Role: MAX6705SKA+T monitors both VCC and secondary supply via PFI divider, asserting PFO to trigger µP interrupt before communication link loss. Use Value: Enables proactive packet buffering and port disablement - reducing packet loss and improving network resilience during partial power faults. |
| Critical µP Power Monitoring | White Goods Control Boards |
Use Scenario: Medical diagnostic devices and test equipment demand zero-reset-failure operation during power transitions. IC Role / Device Role / Timing Role: MAX6705SKA+T provides dual-redundant supervision: RESET ensures clean boot, while WDO feeds NMI to log watchdog timeouts for post-failure analysis. Use Value: Meets IEC 62304 Class C software safety requirements by decoupling reset and fault reporting paths. |
Use Scenario: Refrigerators and washing machines operate in thermally stressed environments with wide ambient temperature swings. IC Role / Device Role / Timing Role: MAX6705SKA+T supervises 3.3V MCU supply and detects compressor driver supply sag via PFI, triggering thermal derating before motor stall. Use Value: Extends appliance lifetime by preventing repeated MCU resets during high-current motor startup events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6705TKA+T | Higher reset threshold (3.30V nominal); otherwise identical pinout, features, and timing | Better suited for +3.3V systems with tighter tolerance margins or higher VCC ripple | Select when system VCC nominal is 3.3V ±0.1V and brownout margin must exceed 220mV |
| TPS3808G33DBVR | TI part with 3.08V threshold, 200ms reset timeout, open-drain RESET, no PFI/PFO comparator | Lacks power-fail warning capability; requires external pull-up; no independent watchdog output | Choose only if PFI/PFO functionality is unused and longer reset timeout is acceptable |
Compared with MAX6705TKA+T and TPS3808G33DBVR, the MAX6705SKA+T uniquely combines 3.08V precision reset, integrated power-fail warning with push-pull PFO, and independent WDO - enabling compact, feature-complete supervision without external components or timing compromises.
Availability
MAX6705SKA+T is available at Aetrix Electronics and suitable for industrial controllers, networking equipment, and critical µP power monitoring requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6705SKA+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 performance under extreme conditions.
The MAX6701–MAX6708 family targets space-constrained µP systems needing robust, low-power supervision with multi-function integration - specifically addressing reset accuracy, watchdog independence, and power-fail predictability in harsh environments.
FAQ
What is the exact reset threshold voltage for MAX6705SKA+T?
The MAX6705SKA+T has a nominal reset threshold of 3.08V (S-suffix), with guaranteed limits of 3.00V (min) and 3.15V (max) over the full –40°C to +125°C temperature range. This value is factory-trimmed and specified in the Electrical Characteristics table of the MAX6705A-07A datasheet Rev 4.
Does MAX6705SKA+T support power-fail warning for voltages other than VCC?
Yes. The MAX6705SKA+T includes a dedicated PFI input referenced to an internal 0.62V comparator. By connecting an external resistor divider from any monitored voltage (e.g., 5V, 12V, or analog sensor supply) to PFI, designers can configure precise early-warning thresholds - enabling power-fail detection on secondary rails independent of VCC.
How does the watchdog behavior differ between MAX6705SKA+T and non-A versions?
The MAX6705SKA+T (A-version) deasserts WDO immediately when VCC recovers above threshold, whereas non-A versions latch WDO low until a valid WDI edge occurs. This makes MAX6705SKA+T more responsive in transient brownout scenarios and simplifies watchdog recovery logic in firmware.
Can MAX6705SKA+T drive a reset input directly without external pull-up resistors?
Yes. The MAX6705SKA+T features a push-pull active-low RESET output capable of sinking ≥1.2mA at VCC ≥ 2.55V while maintaining VOL ≤ 0.3V. This eliminates the need for external pull-up resistors - reducing BOM count and ensuring fast, rail-to-rail reset assertion and release.
Is MAX6705SKA+T qualified for automotive applications?
No. MAX6705SKA+T is rated for industrial temperature range (–40°C to +125°C) and is not AEC-Q100 qualified. While it operates reliably in demanding industrial environments, it lacks automotive-specific qualification, stress testing, and failure-in-time (FIT) data required for automotive ECUs or ADAS systems.
MAX6705SKA+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:
- Multi-Voltage Supervisor
- 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
MAX6705SKA+T FAQ
1.How can I place an order for MAX6705SKA+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6705SKA+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 MAX6705SKA+T reliable?
The price and inventory of MAX6705SKA+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6705SKA+T is usually 5 days.
3.What payment methods are accepted for MAX6705SKA+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6705SKA+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6705SKA+T?
MAX6705SKA+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6705SKA+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 MAX6705SKA+T?
For technical support, including MAX6705SKA+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6705SKA+T requirements.
6.How does Aetrix verify that MAX6705SKA+T is sourced from the original manufacturer or authorized distributors?
All MAX6705SKA+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 MAX6705SKA+T meets industry standards.
7.What is the process for return or replacement of MAX6705SKA+T?
All MAX6705SKA+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6705SKA+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 MAX6705SKA+T part is unused and in its original packaging.
Return procedure for MAX6705SKA+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX6705SKA+T Tags
-
MIC826SYMT-TR
Microchip Technology
-
APX803S-31SA-7
Diodes Incorporated
-
APX803L20-29SA-7
Diodes Incorporated
-
TPS3828-33DBVR
Texas Instruments
-
V6340RSP3B+
EM Microelectronic
-
EM6325CXSP5B-2.9+
EM Microelectronic
-
MCP120T-300I/TT
Microchip Technology
-
MCP130T-315I/TT
Microchip Technology
-
MCP120T-475I/TT
Microchip Technology
-
MCP111T-300E/TT
Microchip Technology
-
MCP120T-315I/TT
Microchip Technology
-
MCP809T-315I/TT
Microchip Technology
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
