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Analog Devices Inc./Maxim Integrated MAX6705MKA
- Part No.:
- MAX6705MKA
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-8
- Datasheet:
-
MAX6705MKA.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL SOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:508
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Product details
Overview
The MAX6705MKA from Maxim Integrated is a low-voltage, 8-pin SOT23 microprocessor supervisory circuit that monitors a single supply voltage (adjustable reset threshold), provides an independent power-fail comparator (0.62V reference), active-low manual reset input with internal 50kΩ pullup, and a 1.6s watchdog timer with independent active-low watchdog output (WDO). It delivers guaranteed reset validity down to VCC = 1V and is used in embedded controllers and industrial systems requiring reliable power-up/down and brownout protection.
For engineers reviewing the MAX6705MKA datasheet, MAX6705MKA pinout, MAX6705MKA application, or MAX6705MKA equivalent, key selection criteria include its active-low push-pull reset output, 140ms reset timeout, 0.62V PFI threshold, watchdog independence from reset assertion, and compatibility with +2.5V to +5.5V supply rails in harsh-temperature environments.
Technical Context
The MAX6705MKA integrates a precision voltage monitor for primary supply (VCC) with user-selectable reset threshold via suffix (e.g., M = 4.38V), a dedicated 0.62V-referenced power-fail comparator (PFI/PFO), and a self-clearing watchdog timer triggered by WDI edge transitions. Its reset generator holds RESET low for ≥140ms after VCC rises above threshold.
Unlike MAX6704/MAX6708, it features an independent WDO output asserted on watchdog timeout or undervoltage conditions - and unlike MAX6701–MAX6703 variants, it monitors only one supply (VCC), not triple-voltage systems. The A-version (denoted by "A" in part number) enables WDO deassertion upon MR low pulse, distinguishing it from non-A variants.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Output Type | Active-low push-pull - drives low without external pullup; sinks ≥1.2mA at VCC ≥ 2.55V. |
| Reset Timeout Period | 140ms minimum - ensures µP remains held in reset long enough for stable clock and supply settling. |
| VCC Operating Range | +2.1V to +5.5V - supports wide-input systems including +2.5V, +3.3V, and +5.0V rails. |
| Watchdog Timeout | 1.6s typical - detects µP lockup if WDI is not toggled within this window. |
| PFI Threshold | 0.62V ±25mV - fixed internal reference enabling precise early-warning power-fail detection via external divider. |
| Supply Current | 9µA typical at VCC = 3.3V - ultra-low quiescent current suitable for battery-backed or energy-sensitive designs. |
| Temperature Range | −40°C to +125°C - qualified for automotive under-hood and industrial control applications. |
Pinout & Package
MAX6705MKA uses an 8-pin SOT23-8 package (JEDEC MO-178 BA variant), 3.0mm × 1.75mm body, 0.65mm pitch, with gull-wing leads and pin 1 marked by dot. Pin 6 is no-connect (N.C.).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (MR) | Manual Reset Input | Active-low CMOS input with internal 50kΩ pullup to VCC; forces reset when pulled low; also clears WDO in A-version. |
| 2 (VCC) | Supply Voltage Input | Primary power rail input (2.1V–5.5V); powers internal comparators, timer, and push-pull outputs. |
| 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 resistive divider for adjustable trip point. |
| 5 (PFO) | Power-Fail Output | Active-low open-drain output; asserts when PFI < 0.62V; requires external pullup for logic-level interface. |
| 6 (N.C.) | No Connection | Not bonded internally; must be left floating or tied to GND/VCC per layout best practice (no electrical function). |
| 7 (RESET) | Reset Output | Active-low push-pull output; guaranteed low ≤0.4V at 1.2mA sink; valid down to VCC = 1V. |
| 8 (WDO) | Watchdog Output | Active-low push-pull output; asserts on watchdog timeout or VCC/RST_IN undervoltage; cleared by WDI edge or MR low (A-version). |
Key Features
| Feature | Design Value |
|---|---|
| Guaranteed reset validity to VCC = 1V | Ensures deterministic µP reset behavior during deep brownout or controlled power-down sequences. |
| Independent PFI/PFO comparator | Enables early power-fail warning and orderly shutdown initiation without affecting reset timing or watchdog state. |
| 1.6s watchdog with edge-triggered clear | Prevents false timeouts from noise or glitches; supports robust µP activity monitoring with minimal software overhead. |
| Immunity to short falling-VCC transients | Rejects sub-100ns supply dips, avoiding spurious resets in electrically noisy environments (e.g., motor drives). |
| Low 9µA supply current | Minimizes system standby power; critical for always-on or battery-buffered supervisory functions. |
Applications
| Industrial PLC Controller | Automotive Body Control Module |
|---|---|
|
Use Scenario: Monitors main 5V logic rail and 3.3V I/O rail in a programmable logic controller exposed to wide ambient temperature swings and EMI. IC Role / Device Role / Timing Role: Primary supervisory IC providing synchronized reset assertion, brownout detection, and watchdog supervision of firmware execution. Use Value: Prevents erratic operation during cold cranking or load dump events by asserting RESET until VCC stabilizes above 4.38V (M-suffix) and holding for 140ms. |
Use Scenario: Embedded in a BCM managing door locks, lighting, and CAN communication, operating from a switched 12V-to-5V supply. IC Role / Device Role / Timing Role: Single-supply supervisor with PFI monitoring the 5V rail and generating PFO interrupt for graceful CAN bus shutdown before power collapse. Use Value: Uses 0.62V PFI reference with external divider to trigger PFO 50ms before 5V rail drops below 4.5V, enabling safe message flush and EEPROM save. |
| Medical Diagnostic Handheld | Network Edge Router Power Management |
|
Use Scenario: Powers up a Cortex-M4-based diagnostic device with dual LDOs (3.3V core, 1.8V analog) and battery backup. IC Role / Device Role / Timing Role: Supervises the 3.3V main rail and provides manual reset via tactile switch; WDO connected to NMI for firmware hang recovery. Use Value: Guarantees RESET remains valid down to VCC = 1V, ensuring safe shutdown during battery depletion while preserving SRAM contents. |
Use Scenario: Manages power sequencing and fault response in a fanless enterprise router with multiple DC-DC converters. IC Role / Device Role / Timing Role: Resets the main SoC on 12V input brownout; PFO triggers FPGA-based power sequencer to disable non-critical subsystems. Use Value: Leverages independent PFO output to initiate staged power-down - disabling PHYs first, then CPU, then memory - reducing inrush and thermal stress. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6705AKA | A-version: WDO deasserts immediately when MR is pulled low; non-A version (MAX6705MKA) requires WDI toggle to clear WDO. | Preferred where manual reset must also force watchdog recovery (e.g., field-service reset button). | Select MAX6705AKA if WDO latching behavior must be overridden by MR; otherwise MAX6705MKA offers simpler watchdog-only timeout response. |
| TPS3808G33DBVR | TI part with 3.3V fixed reset threshold, 200ms timeout, no PFI/PFO comparator, no watchdog output - only reset + MR. | Lacks power-fail warning and independent watchdog signaling; suitable only for basic reset-only use cases. | Choose TPS3808G33DBVR only if PFI/PFO and WDO functionality are unnecessary and 3.3V fixed threshold suffices. |
Compared with MAX6705AKA, MAX6705MKA provides stricter watchdog isolation (WDO unaffected by MR), making it preferable for safety-critical monitoring where manual intervention should not interfere with timeout diagnostics; versus TPS3808G33DBVR, MAX6705MKA adds essential power-fail warning and dual-output supervision at the cost of higher design complexity.
Availability
MAX6705MKA is available at Aetrix Electronics and suitable for industrial PLC controllers, automotive body control modules, medical handheld diagnostics, and network edge routers requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6705MKA 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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, automotive, and communications markets.
The MAX6701–MAX6708 family was designed to replace discrete reset circuits and multiple comparators in µP-based systems, delivering integrated supervision with configurable thresholds, watchdog, and power-fail warning in space-constrained SOT23 packages.
FAQ
What is the reset threshold voltage for MAX6705MKA?
The "M" suffix in MAX6705MKA specifies a nominal VCC reset threshold of 4.38V (min 4.22V, max 4.53V over −40°C to +125°C). This value is factory-trimmed and applies to the primary VCC monitor; the PFI comparator uses a separate fixed 0.62V internal reference. The threshold is not adjustable post-manufacture.
Does MAX6705MKA support dual-supply or triple-supply monitoring?
No. MAX6705MKA monitors only a single supply voltage (VCC) - unlike MAX6701(A)/MAX6702(A)/MAX6703(A) variants which support dual adjustable inputs (RST_IN1/RST_IN2) for triple-voltage supervision. MAX6705MKA's RST_IN1 and RST_IN2 pins are not present; its functional diagram confirms single-supply architecture with dedicated PFI for auxiliary monitoring.
How does the watchdog timer in MAX6705MKA clear?
The MAX6705MKA watchdog timer clears on any rising or falling edge at the WDI pin. It does not clear on MR assertion alone (unlike the A-version MAX6705AKA). If WDI remains static beyond 1.6s, WDO asserts low and remains latched until a valid WDI transition occurs - even if VCC recovers or MR is pulsed.
Can MAX6705MKA's PFO output drive a microcontroller interrupt directly?
Yes, but only with an external pullup resistor. PFO is an open-drain output; it requires a pullup (typically 4.7kΩ to VCC) to generate a clean logic-high level when inactive. When PFI falls below 0.62V, PFO pulls low and can directly assert an active-low interrupt (e.g., INT pin) on most µCs without additional buffering.
Is MAX6705MKA pin-compatible with other devices in the MAX670x family?
MAX6705MKA shares the same 8-pin SOT23-8 footprint and pinout as MAX6705AKA, MAX6706MKA, and MAX6707MKA. However, it is not pin-compatible with MAX6701–MAX6704 or MAX6708 due to differing pin functions (e.g., RST_IN1/RST_IN2 presence, N.C. location, WDO vs. dual RESET assignment).
MAX6705MKA 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:
- 4.38V, Adj
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-8
MAX6705MKA FAQ
1.How can I place an order for MAX6705MKA through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6705MKA 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 MAX6705MKA reliable?
The price and inventory of MAX6705MKA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6705MKA is usually 5 days.
3.What payment methods are accepted for MAX6705MKA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6705MKA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6705MKA?
MAX6705MKA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6705MKA 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 MAX6705MKA?
For technical support, including MAX6705MKA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6705MKA requirements.
6.How does Aetrix verify that MAX6705MKA is sourced from the original manufacturer or authorized distributors?
All MAX6705MKA 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 MAX6705MKA meets industry standards.
7.What is the process for return or replacement of MAX6705MKA?
All MAX6705MKA units undergo pre-shipment inspection (PSI). If there is an issue with MAX6705MKA, 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 MAX6705MKA part is unused and in its original packaging.
Return procedure for MAX6705MKA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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