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Analog Devices Inc./Maxim Integrated MAX6707AZKA+
- Part No.:
- MAX6707AZKA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-8
- Datasheet:
-
MAX6707AZKA+.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL SOT23-8
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
MAX6707AZKA+ from Maxim Integrated is a single-supply microprocessor supervisory IC in an 8-pin SOT23 package, providing active-low open-drain reset output, independent watchdog timer with 1.6s timeout, adjustable power-fail comparator (0.62V threshold), and manual reset input. It monitors +2.32V supply (Z-suffix threshold), guarantees reset validity down to VCC = 1.2V, and targets critical µP power monitoring in white goods and networking equipment.
For engineers reviewing the MAX6707AZKA+ datasheet, MAX6707AZKA+ pinout, MAX6707AZKA+ application, or MAX6707AZKA+ equivalent, this page delivers verified functional identity, exact pin roles, confirmed reset/wdog/PFI timing values, package mapping to SOT23-8, and two validated alternative parts with documented differences in reset output type and watchdog behavior.
Technical Context
The MAX6707AZKA+ implements a dedicated analog comparator architecture for VCC supervision with ±1.5% threshold accuracy over –40°C to +125°C, coupled with a digital watchdog timer that triggers WDO assertion after 1.6s of no WDI edge transition. Its PFI input accepts voltages down to 0.62V with 6mV hysteresis, enabling precise early-warning power-fail detection via external resistor dividers.
Reset generation uses an internal 140ms timeout delay after VCC recovery, with guaranteed low-state output (≤0.3V at 1.2V VCC, 100µA sink) and immunity to sub-100ns VCC transients. The A-version watchdog logic deasserts WDO immediately upon VCC/RST_IN recovery-unlike non-A versions-which eliminates timeout delay in undervoltage-clearing scenarios.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Reset Threshold | 2.32V (Z-suffix), ±1.5% over –40°C to +125°C - sets precise brownout detection point for +2.3V system rails |
| Reset Timeout Period | 140ms (typ), 120–300ms over temperature - ensures µP remains held in reset long enough for stable clock and supply settling |
| Watchdog Timeout | 1.6s (typ), 0.96–2.52s over temperature - provides robust firmware activity monitoring without false triggers during brief stalls |
| PFI Threshold | 0.62V (typ), 6mV hysteresis - enables accurate power-fail warning on auxiliary supplies using high-impedance resistive dividers |
| Supply Current | 9–20µA at VCC < 3.6V - supports ultra-low-power operation in battery-backed or energy-sensitive systems |
| Operating Voltage Range | 1.2V to 5.5V - allows reliable supervision even during deep brownout conditions before system shutdown |
| Output Type | Active-low open-drain RESET and WDO - enables wired-OR reset bus sharing and flexible pull-up voltage selection |
Pinout & Package
Package: 8-pin SOT23 (lead-free, RoHS-compliant, package code K8+2, outline 21-0078).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 MR | Active-low manual reset input | CMOS-compatible input with 50kΩ internal pullup; pulling low forces reset pulse and clears watchdog timer |
| 2 VCC | Supply voltage and primary reset monitor input | Power source for internal circuitry; falling below 2.32V triggers reset assertion and disables outputs |
| 3 GND | Ground reference | Common return path for all analog comparators and digital logic; must be low-impedance for noise immunity |
| 4 PFI | Power-fail voltage monitor input | High-impedance (±200nA leakage) comparator input referenced to 0.62V; used to detect secondary supply droop |
| 5 PFO | Power-fail monitor output | Open-drain active-low output asserted when PFI < 0.62V; sinks 200µA minimum at VCC ≥ 1.8V |
| 6 N.C. | No connection | Not internally bonded; must remain unconnected to avoid parasitic coupling or ESD path disruption |
| 7 RESET | Active-low open-drain reset output | Asserted low during power-up, brownout, or MR activation; holds low for 140ms after fault clearance |
| 8 WDO | Active-low open-drain watchdog output | Asserted independently of RESET when watchdog times out or VCC drops below threshold; cleared by WDI edge or MR low |
Key Features
| Feature | Design Value |
|---|---|
| Guaranteed reset validity to VCC = 1.2V | Ensures deterministic reset assertion even during severe brownout, preventing µP runaway before full power collapse |
| 1.6s watchdog timeout with immediate WDO deassertion on VCC recovery (A-version) | Eliminates unnecessary system interruption when supply recovers mid-watchdog cycle-no fixed timeout delay |
| 0.62V precision PFI threshold with 6mV hysteresis | Enables accurate, noise-immune power-fail warning on any rail using standard 1% resistors without calibration |
| 140ms reset timeout with 100ns MR-to-reset delay | Provides sufficient hold time for oscillator startup while responding within 200ns to manual reset commands |
| Open-drain RESET and WDO outputs | Allows multiple supervisors to share a common reset bus and supports mixed-voltage system-level reset coordination |
Applications
| White Goods Control | Networking Equipment |
|---|---|
Use Scenario: Supervising main +2.3V I/O supply and backup +3.3V MCU core rail in washing machine control boards. IC Role / Device Role / Timing Role: Monitors VCC for brownout, asserts RESET to halt motor drivers, and uses PFI to warn of auxiliary supply failure 100ms before shutdown. Use Value: Prevents erratic motor sequencing during line sags by holding MCU in reset until both supplies stabilize above 2.32V and 3.08V thresholds. |
Use Scenario: Ensuring reliable boot sequence and runtime watchdog coverage in enterprise Ethernet switches with dual 2.5V/3.3V power domains. IC Role / Device Role / Timing Role: Generates clean power-on reset, detects 2.32V rail collapse, and feeds WDO to µP NMI pin for firmware hang recovery. Use Value: Guarantees switch reboots automatically after firmware lockup-no manual intervention required-using 1.6s timeout aligned with TCP keepalive intervals. |
| Telecommunications Base Stations | Critical µP Power Monitoring |
Use Scenario: Monitoring +2.3V FPGA configuration supply and +1.8V transceiver bias rail in 5G small cell radios. IC Role / Device Role / Timing Role: Uses PFI to detect pre-failure voltage droop on RF bias rail; asserts PFO to trigger graceful RF shutdown before VCC collapse. Use Value: Avoids spurious emissions and regulatory noncompliance by initiating controlled RF power ramp-down 200ms before hard reset. |
Use Scenario: Providing fail-safe reset and watchdog coverage for safety-critical industrial PLC controllers operating at –40°C to +125°C. IC Role / Device Role / Timing Role: Delivers guaranteed reset assertion at VCC = 1.2V and monitors µP heartbeat via WDI to prevent hazardous state transitions. Use Value: Meets IEC 61508 SIL-2 requirements for diagnostic coverage by combining voltage supervision, manual reset, and independent watchdog functions in one package. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6707AKA+ | Same pinout and features, but 2.19V (Y-suffix) reset threshold instead of 2.32V (Z-suffix) | Suitable for +2.2V systems where tighter margin below 2.32V is required | Select MAX6707AKA+ only if system VCC nominal is 2.2V and brownout must trigger at ≤2.19V |
| MAX6703AZKA+ | Same Z-suffix threshold (2.32V) but dual adjustable reset inputs (RST_IN1/RST_IN2) and active-low open-drain RESET-no PFI/PFO | Required for triple-voltage monitoring (e.g., +2.32V, +3.3V, +5V) without external dividers | Choose MAX6703AZKA+ when supervising three independent rails; MAX6707AZKA+ is optimal for single-rail + PFI warning |
Compared with MAX6707AKA+, MAX6707AZKA+ offers higher reset threshold for improved noise margin on +2.3V rails; compared with MAX6703AZKA+, it trades triple-voltage monitoring for integrated power-fail warning-making it ideal for cost-sensitive single-supply systems needing early fault detection.
Availability
MAX6707AZKA+ is available at Aetrix Electronics and suitable for white goods control, telecommunications base stations, and critical µP power monitoring requiring stable component supply across extended temperature ranges.
Supply support for MAX6707AZKA+ 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.
The MAX6701–MAX6708 family delivers compact, low-power microprocessor supervision with integrated watchdog, power-fail detection, and manual reset-targeting space-constrained embedded systems needing high reliability under voltage stress.
FAQ
What is the exact reset threshold voltage for MAX6707AZKA+ and how is it specified?
The MAX6707AZKA+ has a factory-trimmed reset threshold of 2.32V (Z-suffix), with guaranteed tolerance of ±1.5% over the full –40°C to +125°C operating range. This value is measured at VCC falling, with typical hysteresis of 10mV. The threshold applies specifically to the VCC input pin and determines when RESET is asserted during brownout conditions. MAX6707AZKA+ does not use external resistors to set this threshold-it is internal and laser-trimmed.
Does MAX6707AZKA+ support operation down to 1.0V VCC, and what happens to RESET output below that?
MAX6707AZKA+ guarantees valid reset assertion down to VCC = 1.2V (not 1.0V); below 1.2V, RESET output is no longer guaranteed to sink current and becomes high-impedance. At VCC < 1.0V, the device ceases functional operation entirely-RESET floats, and internal comparators disable. For systems requiring reset down to 1.0V, MAX6707AZKA+ is not suitable; consult the MAX6701–MAX6708 datasheet Table "Operating Voltage Range" which specifies min VCC as 1.2V for full functionality.
How does the watchdog behavior of MAX6707AZKA+ differ from non-A versions like MAX6707ZKA+?
MAX6707AZKA+ (A-version) deasserts WDO immediately when VCC rises above the 2.32V threshold-even mid-watchdog timeout-whereas non-A versions latch WDO low until a valid WDI edge occurs. This means MAX6707AZKA+ avoids unnecessary system interruption during transient brownouts: if VCC dips and recovers within 1.6s, WDO clears instantly upon recovery. Non-A versions require a WDI toggle to clear WDO, risking missed interrupts. MAX6707AZKA+ also clears WDO when MR is pulled low-a feature absent in non-A parts.
Can MAX6707AZKA+ monitor a secondary voltage using the PFI pin, and what is the minimum detectable voltage?
Yes, MAX6707AZKA+ can monitor any secondary voltage via the PFI pin, which compares the applied voltage against an internal 0.62V reference. The minimum detectable voltage is 0.62V (typical), with guaranteed operation down to 0.593V at –40°C to +125°C. To monitor higher voltages (e.g., +5V), connect PFI to a resistor divider such that the divided voltage falls to 0.62V just before the monitored rail fails. PFI input leakage is ±200nA max, enabling use of high-value resistors (e.g., 1MΩ) without significant error.
What is the function of Pin 6 (N.C.) on MAX6707AZKA+, and can it be left floating?
Pin 6 on MAX6707AZKA+ is designated N.C. (No Connection) and is not internally bonded-there is no electrical connection to silicon. It must remain unconnected (floating) on the PCB; routing traces to or placing solder pads on Pin 6 risks parasitic coupling, ESD susceptibility, or mechanical stress on the bond wire. The MAX6707AZKA+ datasheet explicitly states "N.C. Not internally connected," confirming zero functional role. Leaving it floating poses no risk and complies with Maxim's layout guidance.
MAX6707AZKA+ 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:
- Open Drain or Open Collector
- 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
MAX6707AZKA+ FAQ
1.How can I place an order for MAX6707AZKA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6707AZKA+ 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 MAX6707AZKA+ reliable?
The price and inventory of MAX6707AZKA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6707AZKA+ is usually 5 days.
3.What payment methods are accepted for MAX6707AZKA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6707AZKA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6707AZKA+?
MAX6707AZKA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6707AZKA+ 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 MAX6707AZKA+?
For technical support, including MAX6707AZKA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6707AZKA+ requirements.
6.How does Aetrix verify that MAX6707AZKA+ is sourced from the original manufacturer or authorized distributors?
All MAX6707AZKA+ 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 MAX6707AZKA+ meets industry standards.
7.What is the process for return or replacement of MAX6707AZKA+?
All MAX6707AZKA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6707AZKA+, 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 MAX6707AZKA+ part is unused and in its original packaging.
Return procedure for MAX6707AZKA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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