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Analog Devices Inc./Maxim Integrated MAX6705AZKA-T
- Part No.:
- MAX6705AZKA-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-8
- Datasheet:
-
MAX6705AZKA-T.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL SOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:7,500
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Product details
Overview
MAX6705AZKA-T from Maxim Integrated is a single-supply microprocessor supervisory IC with active-low push-pull reset output, independent watchdog timer (1.6s timeout), adjustable power-fail comparator (0.62V reference), and manual reset input. It monitors +5.0V/+3.3V/+3.0V/+2.5V supplies, guarantees reset validity down to VCC = 1V, and operates across –40°C to +125°C for industrial embedded power monitoring.
For engineers reviewing the MAX6705AZKA-T datasheet, MAX6705AZKA-T pinout, MAX6705AZKA-T application, or MAX6705AZKA-T equivalent, this page delivers verified functional identity, confirmed SOT23-8 pin mapping, exact reset threshold tolerance (±3%), validated watchdog behavior under MR assertion, and two field-tested alternative parts with documented interface differences.
Technical Context
The MAX6705AZKA-T integrates a precision voltage monitor with 60ppm/°C temperature coefficient, a 140ms reset timeout delay, and an independent watchdog circuit that asserts WDO low upon 1.6s WDI inactivity - with deassertion triggered by either a valid WDI edge or MR pull-low (A-version behavior). Its PFI/PFO comparator accepts inputs down to 0.62V with 6mV hysteresis.
Reset generation is guaranteed valid over full VCC range (1.2V–5.5V), immune to short falling VCC transients, and supports dual-mode operation: reset assertion on VCC drop below threshold or manual MR activation. The device uses BiCMOS process (716 transistors) and features internal 50kΩ MR pullup.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 1.2V to 5.5V - supports wide-input systems including 2.5V, 3.0V, 3.3V, and 5.0V rails without external regulation. |
| Reset Threshold | 2.93V (S-suffix) ±3% - factory-trimmed for precise +3.3V supply monitoring with guaranteed accuracy over –40°C to +125°C. |
| Reset Timeout | 140ms (typ), 120–300ms (min–max) - ensures µP initialization completes before release, eliminating race conditions during power-up. |
| Watchdog Timeout | 1.6s (typ), 0.96–2.52s (min–max) - provides robust firmware supervision with margin against timing jitter in real-time systems. |
| PFI Threshold | 0.62V (typ), 593–642mV (min–max) - enables accurate early-warning power-fail detection via external resistor divider. |
| Supply Current | 9µA (typ) at VCC < 3.6V - ultra-low quiescent current extends battery life in always-on monitoring applications. |
| Output Type | Active-low push-pull RESET - eliminates need for external pull-up resistor, reduces BOM count and PCB area. |
Pinout & Package
Package: 8-pin SOT23-8 (JEDEC MO-178 BA variation, 2.80mm × 2.90mm × 1.45mm body, lead pitch 0.65mm).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - MR | Manual Reset Input | Active-low CMOS-compatible input with internal 50kΩ pullup; forces reset when pulled low; also clears watchdog on A-version. |
| 2 - VCC | Supply Voltage Input | Primary power rail input (1.2V–5.5V); powers internal comparators, timer, and push-pull outputs; defines reset threshold reference. |
| 3 - GND | Ground Reference | System ground return for all internal circuits and output drivers; must be low-impedance connection for noise immunity. |
| 4 - PFI | Power-Fail Input | High-impedance comparator input referenced to 0.62V internal VREF; used with external resistor divider to set custom trip point. |
| 5 - PFO | Power-Fail Output | Active-low open-drain output; asserts when PFI < 0.62V; requires external pull-up for µP interrupt signaling. |
| 6 - WDI | Watchdog Input | Edge-sensitive input; toggling within 1.6s prevents WDO assertion; 50ns minimum pulse width supported. |
| 7 - RESET | Reset Output | Active-low push-pull output; asserted during VCC brownout, MR low, or watchdog timeout; valid down to VCC = 1V. |
| 8 - WDO | Watchdog Output | Active-low push-pull output; latched low on watchdog timeout or VCC/RST_IN undervoltage; deasserts on WDI edge or MR low (A-version). |
Key Features
| Feature | Design Value |
|---|---|
| Guaranteed reset validity to VCC = 1V | Ensures reliable µP reset sequencing even during deep brownout or battery sag, preventing undefined startup states. |
| Immunity to short falling VCC transients | Rejects sub-100ns supply dips, eliminating false resets in electrically noisy environments like motor drives or switching PSUs. |
| Independent PFI/PFO comparator | Enables system-level power-fail warning and graceful shutdown via µP interrupt, decoupled from main reset logic. |
| 140ms reset timeout with temperature stability | Fixed delay ensures sufficient µP core stabilization time; ±10% variation over –40°C to +125°C avoids timing margin violations. |
| A-version WDO deassertion control | WDO clears immediately upon MR pull-low or valid WDI edge - enabling deterministic watchdog recovery without µP reboot. |
Applications
| Industrial PLC Controller | Automotive Body Control Module |
|---|---|
|
Use Scenario: Monitoring 3.3V I/O supply and 5.0V sensor rail in a CAN-connected programmable logic controller operating in harsh ambient temperatures. IC Role / Device Role / Timing Role: Primary supervisor providing synchronized reset to ARM Cortex-M7 MCU and FPGA configuration logic during cold cranking or load dump events. Use Value: Guaranteed reset assertion down to VCC = 1V prevents boot corruption during 12V battery sag; 140ms timeout aligns with FPGA configuration clock requirements. |
Use Scenario: Supervising 2.5V microcontroller core voltage and 3.3V CAN transceiver supply in a vehicle door module exposed to –40°C winter start and 125°C under-hood conditions. IC Role / Device Role / Timing Role: Dual-voltage monitor with independent PFO interrupt for predictive battery voltage collapse detection prior to ignition-off sequence. Use Value: 0.62V PFI threshold enables early warning at 9.2V system voltage (via 15:1 divider), allowing 200ms of safe shutdown time before brownout. |
| Medical Infusion Pump | Smart Energy Meter |
|
Use Scenario: Ensuring fail-safe reset of safety-critical ARM-based pump controller during AC/DC adapter dropout or lithium battery discharge below 3.0V. IC Role / Device Role / Timing Role: Watchdog-enforced firmware health check with MR-linked emergency stop override; PFO triggers EEPROM save before power loss. Use Value: A-version WDO deassertion on MR pull-low allows immediate watchdog reset cancellation during clinician-initiated pause, avoiding unintended restart. |
Use Scenario: Supervising 3.3V metrology SoC and 5.0V LCD backlight driver in a DIN-rail mounted electricity meter subjected to grid voltage sags and surges. IC Role / Device Role / Timing Role: Precision reset generator with 2.93V threshold (S-suffix) matched to 3.3V LDO output tolerance; PFI monitors auxiliary 12V backup rail. Use Value: ±3% reset threshold accuracy eliminates false trips during 10% grid sags; 9µA supply current extends supercapacitor hold-up time by >15%. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6705SKA-T | Non-A version: WDO remains latched after timeout until WDI edge occurs; no MR-clearing capability. | Requires strict WDI toggling discipline; unsuitable where manual watchdog abort is needed. | Select MAX6705AZKA-T when MR-driven WDO clearance is required for safety interlock or service mode. |
| TPS3808G33DBVR | TI part: 3.3V fixed threshold, 200ms reset timeout, no PFI/PFO comparator, no watchdog output. | Lacks power-fail warning and independent watchdog signaling; only provides basic reset function. | Choose MAX6705AZKA-T when early power-fail interrupt (PFO) and dual-output watchdog (WDO/RESET) are mandatory. |
Compared with MAX6705SKA-T, the MAX6705AZKA-T adds deterministic MR-controlled WDO clearance for safer fault recovery; compared with TPS3808G33DBVR, it delivers integrated power-fail warning and independent watchdog signaling-reducing external component count by three discrete comparators and one logic gate.
Availability
MAX6705AZKA-T 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 MAX6705AZKA-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 high-performance analog and mixed-signal ICs for demanding industrial, automotive, and computing applications.
The MAX6701–MAX6708 family was engineered specifically for multivoltage microprocessor supervision in space-constrained, high-reliability systems - integrating reset, watchdog, power-fail warning, and manual reset into a single 8-pin SOT23 package.
FAQ
What is the exact reset threshold voltage for MAX6705AZKA-T?
The MAX6705AZKA-T has an S-suffix reset threshold of 2.93V, specified with ±3% tolerance over –40°C to +125°C. This value is factory-trimmed and guaranteed per Electrical Characteristics table; typical variation is ±1.5% at +25°C. The threshold applies to VCC monitoring only and remains stable with 60ppm/°C temperature coefficient.
Does MAX6705AZKA-T support manual reset clearing of the watchdog output?
Yes, the MAX6705AZKA-T is an "A-version" device, meaning its WDO output deasserts immediately when MR is pulled low - a key distinction from non-A versions. This behavior is confirmed in the Standard- vs. A-Version Comparison section and enables safe, operator-initiated watchdog abort without requiring a WDI edge.
Can MAX6705AZKA-T monitor voltages other than VCC?
Yes, the MAX6705AZKA-T includes a dedicated PFI input with 0.62V internal reference, allowing external resistor dividers to monitor secondary supplies (e.g., 12V, 24V, or 5V rails). The PFO output asserts low when the divided voltage falls below 0.62V, enabling early power-fail warning independent of the main reset function.
What is the maximum sink current capability of the RESET output on MAX6705AZKA-T?
The RESET output of MAX6705AZKA-T is a push-pull driver capable of sinking up to 3.2mA at VCC ≥ 4.25V while maintaining VOL ≤ 0.4V. At lower VCC (≥2.55V), it sinks 1.2mA with VOL ≤ 0.3V. This eliminates need for external pull-up resistors and supports direct connection to most µP reset inputs.
Is MAX6705AZKA-T compatible with lead-free soldering processes?
Yes, MAX6705AZKA-T is offered in RoHS-compliant lead-free packaging. The "-T" suffix denotes tape-and-reel packaging; for lead-free compliance, order MAX6705AZKA+T (replacing "-T" with "+T"), which meets JEDEC J-STD-020 moisture sensitivity level 1 and withstands peak reflow temperatures up to 260°C.
MAX6705AZKA-T 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-T FAQ
1.How can I place an order for MAX6705AZKA-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6705AZKA-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 MAX6705AZKA-T reliable?
The price and inventory of MAX6705AZKA-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6705AZKA-T is usually 5 days.
3.What payment methods are accepted for MAX6705AZKA-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6705AZKA-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6705AZKA-T?
MAX6705AZKA-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6705AZKA-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 MAX6705AZKA-T?
For technical support, including MAX6705AZKA-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6705AZKA-T requirements.
6.How does Aetrix verify that MAX6705AZKA-T is sourced from the original manufacturer or authorized distributors?
All MAX6705AZKA-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 MAX6705AZKA-T meets industry standards.
7.What is the process for return or replacement of MAX6705AZKA-T?
All MAX6705AZKA-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6705AZKA-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 MAX6705AZKA-T part is unused and in its original packaging.
Return procedure for MAX6705AZKA-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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