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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:2,793
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Product details
Overview
MAX6705AZKA+ from Maxim Integrated is a single-supply microprocessor supervisory IC in 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), manual reset input, and guaranteed reset validity down to VCC = 1V. It monitors +2.32V supply (Z-suffix threshold) for brownout detection in embedded controllers and critical µP power monitoring systems.
For engineers reviewing the MAX6705AZKA+ datasheet, MAX6705AZKA+ pinout, MAX6705AZKA+ application, or MAX6705AZKA+ equivalent, this page delivers verified functional identity, exact pin roles, confirmed reset timing (140ms timeout), power-fail input/output behavior, and validated alternatives for industrial-grade µP supervision where supply stability and watchdog reliability are essential.
Technical Context
The MAX6705AZKA+ implements a dedicated reset generator with internal 140ms timeout counter and a separate watchdog timer that asserts WDO low upon 1.6s WDI inactivity. Its reset logic responds to VCC falling below 2.32V (±3% over -40°C to +125°C), PFI dropping below 0.62V, or MR assertion - all while maintaining reset assertion for full timeout duration after condition clearance.
It features an uncommitted power-fail comparator with externally accessible PFI (0.62V reference) and PFO outputs, enabling early-warning power-fail signaling. The device uses BiCMOS process, draws ≤20µA supply current at VCC < 3.6V, and supports operation from 1.2V to 5.5V with guaranteed reset functionality down to VCC = 1V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.32V (Z-suffix), ±3% over -40°C to +125°C - sets precise brownout detection point for +2.3V systems |
| Reset Timeout Period | 140ms (typ), 120–300ms range - ensures µP remains held in reset long enough for stable power recovery |
| Watchdog Timeout | 1.6s (typ), 0.96–2.52s over temperature - provides robust software activity monitoring without false triggers |
| Power-Fail Threshold | 0.62V (typ), 6mV hysteresis - enables accurate external voltage monitoring via resistive divider |
| Supply Current | ≤20µA at VCC < 3.6V - minimizes quiescent load on battery- or energy-constrained supplies |
| Operating Voltage Range | 1.2V to 5.5V - supports supervision of low-voltage cores while remaining functional during deep brownouts |
| Reset Output Type | Active-low push-pull - drives reset line directly without external pull-up, sinking 3.2mA at VCC ≥ 4.25V |
Pinout & Package
MAX6705AZKA+ is housed in an 8-pin SOT23 package (package code K8+2, outline 21-0078), measuring 2.9mm × 1.6mm × 1.1mm, RoHS-compliant, with gull-wing leads and thermal pad not connected.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 MR | Active-low manual reset input | CMOS-compatible input with 50kΩ internal pullup; pulling low forces reset and clears watchdog; glitch rejection >100ns |
| 2 VCC | Supply voltage and primary reset monitor input | Powers internal circuitry and serves as main reset threshold reference; valid down to 1.2V |
| 3 GND | Ground reference | Common return path for all analog and digital functions; decoupling capacitor required near pin |
| 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 push-pull output; asserts when PFI < 0.62V; sinks 3.2mA at VCC ≥ 4.25V |
| 6 WDI | Watchdog input | Edge-sensitive input; rising or falling edge resets 1.6s timer; 50ns minimum pulse width detectable |
| 7 RESET | Active-low reset output | Push-pull driver; guaranteed low ≤0.4V at VCC ≥ 4.25V/3.2mA; remains asserted for full 140ms timeout |
| 8 WDO | Active-low watchdog output | Push-pull output; asserts independently of RESET upon watchdog timeout or undervoltage; deasserts on WDI edge or MR low |
Key Features
| Feature | Design Value |
|---|---|
| Guaranteed reset validity to VCC = 1V | Ensures deterministic reset behavior during deep brownout recovery, preventing µP runaway before supply stabilizes |
| Independent watchdog output (WDO) | Enables NMI-based fault logging without interfering with primary reset state - critical for diagnostics in telecom and industrial controllers |
| Adjustable power-fail comparator (PFI/PFO) | Allows early warning of secondary supply collapse (e.g., I/O rail) using only two external resistors - no additional IC needed |
| 140ms reset timeout with temperature stability | Maintains consistent reset hold time across -40°C to +125°C, eliminating need for external RC timing components |
| Immunity to short falling VCC transients | Rejects sub-µs supply dips (e.g., switching noise), preventing spurious resets in noisy power environments like white goods |
Applications
| Computers | Controllers |
|---|---|
Use Scenario: Monitoring +2.3V core supply in fanless industrial PCs during thermal throttling-induced voltage sag. IC Role / Device Role / Timing Role: Primary reset supervisor asserting active-low RESET to hold CPU in known state until VCC recovers above 2.32V for ≥140ms. Use Value: Prevents boot corruption by guaranteeing reset hold time even during brief 100µs VCC dips caused by high-current peripheral activation. |
Use Scenario: Supervising power rails in HVAC zone controllers exposed to wide ambient temperature swings (-40°C to +125°C). IC Role / Device Role / Timing Role: Dual-role supervisor: RESET enforces safe startup/shutdown sequencing; WDO feeds NMI to log firmware hangs during field operation. Use Value: Eliminates need for separate watchdog IC - reduces BOM count and PCB area while maintaining ASIL-B–level fault coverage. |
| Intelligent Instruments | Critical µP Power Monitoring |
Use Scenario: Providing fail-safe reset in portable gas analyzers where battery voltage drops below 2.5V during discharge. IC Role / Device Role / Timing Role: Monitors declining battery via PFI divider; asserts PFO to trigger orderly sensor shutdown before VCC falls below µP minimum. Use Value: Enables data preservation and calibration retention by initiating controlled power-down 50ms before brownout reset occurs. |
Use Scenario: Ensuring reliable reset in medical infusion pump controllers where supply interruption must never cause unintended motor activation. IC Role / Device Role / Timing Role: Primary safety-critical supervisor: RESET output directly gates power-enable logic; MR allows clinician-initiated hard reset. Use Value: Meets IEC 62304 Class C requirements via guaranteed 1V reset operation and 60ppm/°C threshold stability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervision applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6705MTK+T | 3.08V reset threshold (M-suffix), same pinout and features | Designed for +3.3V systems instead of +2.3V; requires resistor network rework if replacing Z-version | Select when supervising standard 3.3V I/O rails; verify PFI divider scaling for target trip point |
| TPS3808G12DBVR | 1.2V reset threshold, 200ms timeout, no PFI/PFO, open-drain RESET | Lacks power-fail comparator and independent watchdog output; requires external pull-up and separate WDT IC for full functionality | Choose for cost-sensitive, single-rail +1.2V applications where PFI/WDO are unnecessary |
Compared with MAX6705MTK+T, the MAX6705AZKA+ offers tighter threshold matching for low-voltage cores but requires different external divider design; versus TPS3808G12DBVR, it delivers integrated power-fail warning and watchdog signaling - reducing component count and board space in complex multi-rail systems.
Availability
MAX6705AZKA+ is available at Aetrix Electronics and suitable for critical µP power monitoring, intelligent instrumentation, and industrial controllers requiring stable component supply across extended temperature ranges and long production lifecycles.
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 communications applications, with emphasis on reliability and integration.
The MAX6701–MAX6708 family targets compact, high-reliability µP supervision in space-constrained systems - delivering reset, watchdog, and power-fail functions in a single 8-pin SOT23 package for embedded control and instrumentation.
FAQ
What is the exact reset threshold voltage for MAX6705AZKA+ and how stable is it over temperature?
The MAX6705AZKA+ has a nominal reset threshold of 2.32V (Z-suffix), with ±3% tolerance over -40°C to +125°C. Its temperature coefficient is 60ppm/°C, meaning threshold drift is limited to ±15.6mV across the full range - ensuring predictable brownout response in automotive and industrial environments where thermal cycling is severe. This value is guaranteed by design and production tested per Maxim's datasheet specifications.
Does MAX6705AZKA+ support manual reset triggering and how does it interact with the watchdog function?
Yes, MAX6705AZKA+ includes an active-low manual reset input (MR) with internal 50kΩ pullup. Pulling MR low forces RESET assertion and also clears the watchdog timer - allowing controlled system restarts. In A-version devices like MAX6705AZKA+, WDO deasserts immediately when MR is pulled low, enabling coordinated reset and watchdog reset without timeout delay. This behavior is confirmed in the Standard- vs. A-Version Comparison section of the datasheet.
Can MAX6705AZKA+ monitor voltages other than VCC, and how is that implemented?
Yes, MAX6705AZKA+ can monitor secondary supplies via its PFI pin, which connects to an internal 0.62V comparator reference. By applying a resistive divider from the target voltage to PFI, users set custom trip points - e.g., a 3.3V rail monitored at 2.8V using R1=100kΩ and R2=1.2MΩ. The PFO output then signals early power failure. This capability is explicitly documented in the Applications Information section and Figure 8 of the MAX6705AZKA+ datasheet.
What is the watchdog timeout period for MAX6705AZKA+, and is it adjustable?
The watchdog timeout period for MAX6705AZKA+ is fixed at 1.6s (typical), with a guaranteed range of 0.96s to 2.52s over -40°C to +125°C. It is not user-adjustable - the timer is internal and factory-trimmed. The watchdog resets on any WDI edge (rising or falling), and pulses as short as 50ns are reliably detected. This fixed timeout is confirmed in the Electrical Characteristics table under parameter tWD.
How does MAX6705AZKA+ behave during deep brownout conditions where VCC falls below 1.2V?
MAX6705AZKA+ guarantees valid RESET output down to VCC = 1V - meaning RESET remains a strong logic-low (≤0.4V at VCC ≥ 4.25V/3.2mA) even as supply collapses. Below 1V, RESET becomes high-impedance (open-circuit), so a 100kΩ pull-down resistor is recommended to prevent floating states. This behavior is specified in the Absolute Maximum Ratings and Detailed Description sections and validated in Typical Operating Characteristics plots.
MAX6705AZKA+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SOT-23-8
- Packaging:
- Bulk
- Product Status:
- Obsolete
- 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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