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Analog Devices Inc./Maxim Integrated MAX6701AZKA+
- Part No.:
- MAX6701AZKA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-8
- Datasheet:
-
MAX6701AZKA+.pdf
- Description:
- POWER SUPPLY MANAGEMENT CIRCUIT,
- Quantity:
- Payment:
- Shipping:
Inventory:3,661
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Product details
Overview
MAX6701AZKA+ from Maxim Integrated is a low-voltage microprocessor supervisory circuit in an 8-pin SOT23 package, providing active-low push-pull reset output, 1.6s watchdog timeout, 0.62V power-fail comparator input, and manual reset input. It monitors +5.0V/+3.3V/+3.0V/+2.5V supply rails and guarantees valid reset down to VCC = 1V for reliable µP startup and brownout recovery in industrial controllers.
For engineers reviewing the MAX6701AZKA+ datasheet, MAX6701AZKA+ pinout, MAX6701AZKA+ application, or MAX6701AZKA+ equivalent, key selection criteria include reset threshold accuracy (±3% over -40°C to +125°C), immunity to short VCC transients, guaranteed 140ms reset timeout delay, and compatibility with triple-voltage supervision via external resistor dividers on RST_IN1/RST_IN2.
Technical Context
The MAX6701AZKA+ implements a dual-threshold supervision architecture: primary VCC monitoring at a fixed 4.63V reset threshold (L-suffix), plus two user-adjustable inputs (RST_IN1/RST_IN2) referenced to an internal 0.62V bandgap. Its watchdog timer triggers WDO assertion after 1.6s of no WDI edge transition, and resets automatically upon VCC/RST_IN1/RST_IN2 recovery or MR assertion.
Reset generation uses an internal 140ms timeout counter that holds RESET low after VCC rises above threshold, ensuring µP initialization stability. The power-fail comparator features 6mV hysteresis and <200nA leakage at -40°C to +125°C, enabling precise early-warning detection of supply droop before critical brownout.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Reset Threshold | 4.63V (L-suffix), ±3% tolerance over full temperature range ensures stable reset point across industrial environments |
| Reset Timeout Period | 140ms typical, 120–300ms min/max - guarantees sufficient µP initialization time after power-up |
| Watchdog Timeout Period | 1.6s typical, 0.96–2.52s min/max - provides robust software activity monitoring without false triggers |
| Power-Fail Input Threshold | 0.62V ±25mV - enables precise secondary voltage monitoring via external resistive divider |
| Supply Current | 9–20µA at VCC < 3.6V - ultra-low quiescent current extends battery life in always-on systems |
| Operating Voltage Range | 1.2V to 5.5V - supports operation during deep brownout and ensures reset validity down to 1V |
| Reset Output Type | Active-low push-pull - eliminates need for external pull-up resistor and drives heavy loads directly |
Pinout & Package
Package: 8-pin SOT23-8 (JEDEC MO-178 variation BA), 2.80mm × 2.90mm footprint, 1.45mm height, RoHS-compliant lead-free finish (+ suffix).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 MR | Manual Reset Input | CMOS-compatible active-low input with 50kΩ internal pullup; forces reset when pulled low, debounced by 140ms timeout |
| 2 VCC | Supply Voltage Input | Primary power rail input (1.2–5.5V); powers internal comparators and push-pull outputs; defines reset threshold reference |
| 3 GND | Ground Reference | Analog and digital ground return path; must be low-impedance connection to ensure comparator accuracy |
| 4 PFI | Power-Fail Input | High-impedance (±200nA leakage) comparator input referenced to 0.62V internal reference; accepts external voltage divider for secondary rail monitoring |
| 5 PFO | Power-Fail Output | Active-low open-drain output asserted when PFI < 0.62V; requires external pullup for interrupt signaling to µP |
| 6 WDI | Watchdog Input | Edge-sensitive input detecting rising/falling transitions; 50ns minimum pulse width; clears watchdog timer on each valid edge |
| 7 RESET | Reset Output | Active-low push-pull output; sinks ≥1.2mA at VCC ≥ 2.55V; remains asserted for full 140ms timeout after fault clearance |
| 8 WDO | Watchdog Output | Active-low push-pull watchdog status output; asserts independently of RESET during timeout or undervoltage events |
Key Features
| Feature | Design Value |
|---|---|
| Triple-voltage supervision capability | Simultaneous monitoring of VCC + two adjustable supplies (RST_IN1/RST_IN2) via external dividers enables comprehensive system-level power integrity checking |
| Guaranteed reset validity to VCC = 1V | Ensures deterministic µP reset state even during severe brownout conditions where other supervisors lose functionality |
| Immunity to short falling VCC transients | Rejects <100ns glitches on VCC line, preventing spurious resets in electrically noisy industrial environments |
| Independent watchdog output (WDO) | Provides dedicated NMI-capable fault signal separate from main reset, enabling differentiated error handling in safety-critical firmware |
| 0.62V precision power-fail comparator | Enables accurate early-warning detection of secondary supply collapse (e.g., I/O rail) with minimal external components |
Applications
| Industrial PLC Controllers | Automotive Body Control Modules |
|---|---|
Use Scenario: Monitoring 5V system rail and 3.3V microcontroller core supply in programmable logic controllers operating in factory-floor environments with wide temperature swings and EMI. IC Role / Device Role / Timing Role: Primary supervisory IC providing synchronized reset assertion, brownout protection, and watchdog-triggered fail-safe shutdown. Use Value: Prevents corrupted firmware execution during voltage sags by guaranteeing 140ms reset hold time and validating reset down to 1V VCC. | Use Scenario: Supervising 12V-to-5V DC-DC converter output and 3.3V MCU supply in automotive body control units exposed to load-dump transients and cold-crank conditions. IC Role / Device Role / Timing Role: Dual-rail supervisor with independent power-fail warning (PFI/PFO) for predictive battery voltage monitoring prior to ignition cutoff. Use Value: Enables orderly EEPROM save operations before power loss using 0.62V comparator threshold set for 9.5V battery warning level. |
| Medical Diagnostic Equipment | Networking Edge Routers |
Use Scenario: Ensuring reliable boot sequence and runtime supervision of ARM-based processing modules in portable ultrasound devices powered by Li-ion batteries. IC Role / Device Role / Timing Role: Low-quiescent-current (9µA) supervisor maintaining µP reset integrity during battery discharge from 4.2V to 3.0V while supporting manual reset via tactile switch. Use Value: Extends operational runtime by minimizing supply current while guaranteeing reset assertion at 3.08V (T-suffix variant) during battery depletion. | Use Scenario: Monitoring primary 3.3V switching regulator and auxiliary 1.8V PHY supply in enterprise-grade Ethernet switches requiring continuous uptime. IC Role / Device Role / Timing Role: Triple-supply supervisor using RST_IN1/RST_IN2 to track secondary rails, with watchdog timer enforcing software health checks every 1.6s. Use Value: Detects firmware hangs or memory corruption via WDI timeout and forces controlled reboot without requiring host CPU intervention. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6701ALKA | Same functionality and pinout, but leaded (non-RoHS) packaging; identical electrical specs and temperature range (-40°C to +125°C) | No difference in circuit design or performance; only packaging compliance differs | Select MAX6701ALKA only if leaded assembly process is required and RoHS exemption applies |
| MAX6705AZKA+ | Same package and RoHS compliance, but single-supply supervision only (no RST_IN1/RST_IN2); includes PFO with push-pull output | Lacks triple-voltage monitoring capability; optimized for simpler systems with one primary rail + power-fail warning | Choose MAX6705AZKA+ when monitoring only VCC and a secondary rail via PFI, not three independent supplies |
Compared with MAX6701ALKA and MAX6705AZKA+, the MAX6701AZKA+ uniquely supports triple-supply monitoring with adjustable thresholds while maintaining RoHS compliance and identical timing parameters-making it optimal for complex embedded systems requiring comprehensive power integrity validation.
Availability
MAX6701AZKA+ is available at Aetrix Electronics and suitable for industrial controllers, automotive body electronics, medical diagnostic equipment, and networking edge routers requiring stable component supply with guaranteed long-term availability.
Supply support for MAX6701AZKA+ 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 industrial, automotive, and communications applications, emphasizing high reliability and extended temperature operation.
The MAX6701–MAX6708 family was engineered specifically for robust microprocessor supervision in harsh environments, integrating reset generation, watchdog timing, power-fail warning, and manual reset in ultra-small SOT23 packages.
FAQ
What is the exact reset threshold voltage for MAX6701AZKA+?
The MAX6701AZKA+ has a nominal VCC reset threshold of 4.63V (L-suffix), with ±3% tolerance over the full -40°C to +125°C operating temperature range. This value is specified in the Electrical Characteristics table under "VCC Reset Threshold (VTH)" and is guaranteed by production testing-not just design simulation.
Does MAX6701AZKA+ support monitoring of three independent supply voltages?
Yes, the MAX6701AZKA+ supports triple-voltage supervision: primary VCC (4.63V threshold), plus two user-adjustable supplies via RST_IN1 and RST_IN2 pins. Each uses the internal 0.62V reference with external resistor dividers, allowing independent reset assertion if any monitored rail falls below its configured threshold.
What is the function of the WDO pin on MAX6701AZKA+?
The WDO (Watchdog Output) pin on MAX6701AZKA+ is an active-low push-pull output that asserts independently of the main RESET signal. It goes low upon watchdog timeout (1.6s), VCC undervoltage, or MR assertion-and deasserts only after a valid WDI edge or MR release, enabling dedicated NMI-based fault handling in firmware.
Can MAX6701AZKA+ operate reliably during severe brownout conditions?
Yes, MAX6701AZKA+ guarantees valid reset output down to VCC = 1V, and its internal circuitry remains functional even as supply voltage collapses. The device continues asserting RESET until VCC drops below 1V, and its immunity to short falling transients (<100ns) prevents spurious resets during rapid voltage sags common in industrial power systems.
Is MAX6701AZKA+ pin-compatible with other members of the MAX6701–MAX6708 family?
Yes, all MAX6701–MAX6708 variants-including MAX6701AZKA+-share identical 8-pin SOT23-8 pinout and footprint. However, functional differences exist: MAX6701AZKA+ provides active-low push-pull RESET and WDO, while MAX6704/MAX6708 offer complementary reset outputs, and MAX6703/MAX6707 use open-drain configurations.
MAX6701AZKA+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SOT-23-8
- Packaging:
- Bulk
- Product Status:
- Active
- Programmable:
- -
- Type:
- Multi-Voltage Supervisor
- Number of Voltages Monitored:
- 3
- Voltage - Threshold:
- 2.32V, Adj, 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
MAX6701AZKA+ FAQ
1.How can I place an order for MAX6701AZKA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6701AZKA+ 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 MAX6701AZKA+ reliable?
The price and inventory of MAX6701AZKA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6701AZKA+ is usually 5 days.
3.What payment methods are accepted for MAX6701AZKA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6701AZKA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6701AZKA+?
MAX6701AZKA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6701AZKA+ 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 MAX6701AZKA+?
For technical support, including MAX6701AZKA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6701AZKA+ requirements.
6.How does Aetrix verify that MAX6701AZKA+ is sourced from the original manufacturer or authorized distributors?
All MAX6701AZKA+ 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 MAX6701AZKA+ meets industry standards.
7.What is the process for return or replacement of MAX6701AZKA+?
All MAX6701AZKA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6701AZKA+, 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 MAX6701AZKA+ part is unused and in its original packaging.
Return procedure for MAX6701AZKA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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