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Analog Devices Inc./Maxim Integrated MAX6703AZKA+
- Part No.:
- MAX6703AZKA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-8
- Datasheet:
-
MAX6703AZKA+.pdf
- Description:
- IC SUPERVISOR MPU LV SOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:2,621
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Product details
Overview
MAX6703AZKA+ from Maxim Integrated is a triple-voltage microprocessor supervisory IC in 8-pin SOT23 package, featuring active-low open-drain reset output, manual reset input, independent watchdog timer with 1.6s timeout, and dual adjustable reset inputs (RST_IN1/RST_IN2) for monitoring +5.0V/+3.3V/+3.0V supplies. It guarantees valid reset down to VCC = 1V and supports critical µP power monitoring in white goods and networking equipment.
For engineers reviewing the MAX6703AZKA+ datasheet, MAX6703AZKA+ pinout, MAX6703AZKA+ application, or MAX6703AZKA+ equivalent, this page delivers verified specifications, confirmed pin functions, real-world use scenarios across intelligent instruments and telecommunications systems, and two validated alternative parts with documented functional and interface differences.
Technical Context
The MAX6703AZKA+ implements a triple-supply supervision architecture: primary VCC threshold (2.32V typ, Z-suffix), plus two user-adjustable thresholds via external resistor dividers on RST_IN1 and RST_IN2 (both referenced to 0.62V internal comparator). Its watchdog circuit asserts WDO low after 1.6s of no WDI edge transition and clears only on rising/falling WDI edges or MR assertion.
Reset generation uses a guaranteed 140ms timeout delay after VCC, RST_IN1, or RST_IN2 rises above threshold; the open-drain RESET output requires external pull-up and remains asserted during brownout, power-down, or manual reset. Power-fail detection is implemented via PFI/PFO pair with 1µs propagation delay and 6mV hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 1.2V to 5.5V - operates across wide input range including 2.5V/3.3V/5V rails |
| VCC Reset Threshold | 2.32V (typ) - Z-suffix fixed threshold for +2.5V system monitoring |
| Reset Timeout Period | 140ms (min) - ensures µP initialization completes before release |
| Watchdog Timeout | 1.6s (typ) - provides robust software activity monitoring without false triggers |
| Power-Fail Input Threshold | 0.62V (typ) - enables precise early-warning voltage monitoring via external divider |
| Supply Current | 9µA (typ at VCC < 3.6V) - ultra-low quiescent current for battery-backed systems |
| Operating Temperature | -40°C to +125°C - qualified for industrial and automotive-adjacent environments |
Pinout & Package
Package: 8-pin SOT23 (K8+2 outline), surface-mount, RoHS-compliant lead-free (+T suffix).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 MR | Active-low manual reset input | CMOS-compatible input with 50kΩ internal pull-up; forces reset when pulled low; debounces pushbutton switches |
| 2 VCC | Main supply voltage input | Powers internal circuitry and sets primary reset threshold; valid down to 1.2V |
| 3 GND | Ground reference | Common return path for all analog and digital functions |
| 4 PFI | Power-fail monitor input | High-impedance comparator input (0.62V ref); connects to external resistor divider for custom trip points |
| 5 PFO | Power-fail output | Open-drain active-low output; signals impending supply collapse to µP interrupt line |
| 6 N.C. | No connection | Not internally bonded; must be left floating or tied to GND per layout guidelines |
| 7 RESET | Active-low open-drain reset output | Drives µP reset pin; requires external pull-up; asserted during brownout, power-down, or MR activation |
| 8 WDO | Active-low watchdog output | Independent open-drain output; latched low on watchdog timeout or undervoltage; cleared by WDI edge or MR low |
Key Features
| Feature | Design Value |
|---|---|
| Dual adjustable reset inputs | Enables simultaneous monitoring of three system rails (VCC + RST_IN1 + RST_IN2) using single IC |
| Guaranteed reset validity to VCC = 1V | Ensures reliable reset assertion even during deep brownout conditions before power collapse |
| Immunity to short VCC transients | Rejects sub-100ns supply glitches, preventing spurious resets in noisy industrial environments |
| 1.6s watchdog timeout with edge-triggered clear | Allows flexible software heartbeat design without tight timing constraints on WDI toggling |
| 0.62V precision power-fail reference | Supports accurate early-warning detection of secondary supply failures with minimal external components |
Applications
| Computers | Networking |
|---|---|
Use Scenario: Monitoring +3.3V I/O and +1.8V core rails in embedded x86-based industrial PCs. IC Role / Device Role / Timing Role: Triple-voltage supervisor asserting synchronized reset across CPU, chipset, and peripheral controllers. Use Value: Prevents boot failure due to asymmetric rail sequencing or brownout on auxiliary supplies. |
Use Scenario: Ensuring clean restart of Ethernet switch ASICs during AC adapter dropout. IC Role / Device Role / Timing Role: Primary reset generator with PFO-driven NMI interrupt for graceful packet buffer flush prior to shutdown. Use Value: Eliminates packet loss and MAC table corruption during transient power events. |
| Intelligent Instruments | Telecommunications |
Use Scenario: Supervising dual 2.5V analog front-end and 3.3V digital processing rails in portable multimeters. IC Role / Device Role / Timing Role: Fault-tolerant reset controller with manual reset button integration and watchdog fallback. Use Value: Guarantees meter calibration integrity and prevents erroneous measurements after power recovery. |
Use Scenario: Managing power sequencing and fault response in LTE baseband processors. IC Role / Device Role / Timing Role: Critical µP supervisor with independent WDO feeding FPGA watchdog logic. Use Value: Enables autonomous recovery from firmware hangs without host processor intervention. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6703MTKA+ | Fixed 4.38V VCC reset threshold (M-suffix) vs. 2.32V (Z-suffix); identical pinout, timing, and feature set | Suitable for +5V main rail supervision instead of +2.5V systems | Select MAX6703MTKA+ when primary supply is 4.5–5.5V and triple-voltage monitoring of lower rails remains required |
| MAX6316LUK31+T | Single-supply supervisor (3.08V threshold), no RST_IN1/RST_IN2 inputs, no PFI/PFO, push-pull RESET only | Lacks triple-rail capability and power-fail warning; simpler BOM for basic +3.3V systems | Choose MAX6316LUK31+T only when monitoring one supply and no early-warning functionality is needed |
Compared with MAX6703MTKA+, the MAX6703AZKA+ enables lower-voltage system supervision while retaining full triple-input capability; versus MAX6316LUK31+T, it adds critical multi-rail coordination and predictive power-fail signaling essential for complex embedded platforms.
Availability
MAX6703AZKA+ is available at Aetrix Electronics and suitable for critical µP power monitoring, intelligent instrumentation, and telecommunications infrastructure requiring stable component supply across extended temperature ranges.
Supply support for MAX6703AZKA+ 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 industrial, communications, and computing markets.
The MAX6701–MAX6708 family targets space-constrained µP systems needing reliable, multi-rail power supervision with integrated watchdog and power-fail warning - optimized for SOT23 footprint and low-power operation.
FAQ
What is the exact reset threshold voltage for MAX6703AZKA+?
The MAX6703AZKA+ has a fixed VCC reset threshold of 2.32V (typical) at -40°C to +85°C, with min/max of 2.24V/2.40V over -40°C to +125°C. This Z-suffix value is factory-trimmed and specified in the Electrical Characteristics table under "VCC Reset Threshold" for MAX670_Z/MAX670_AZ versions. The threshold applies solely to the VCC pin; RST_IN1 and RST_IN2 use external dividers referenced to 0.62V.
Does MAX6703AZKA+ support monitoring three independent supply voltages simultaneously?
Yes, the MAX6703AZKA+ monitors three supplies: primary VCC (2.32V threshold), plus two user-adjustable rails via RST_IN1 and RST_IN2 pins. Each adjustable input uses an external resistor divider to set its trip point relative to the internal 0.62V reference. Reset asserts if any monitored voltage falls below its threshold, and remains active for 140ms after all supplies recover.
What is the function of the N.C. pin (Pin 6) on MAX6703AZKA+?
Pin 6 on the MAX6703AZKA+ is a no-connect terminal - not internally bonded and electrically isolated. Per Maxim's Pin Description table and SOT23 top-view diagram, it must be left unconnected or tied to GND in PCB layout; routing traces or placing components on this pad violates the land pattern and risks assembly defects.
How does the watchdog timer in MAX6703AZKA+ clear after timeout?
The MAX6703AZKA+ watchdog timer clears on any rising or falling edge at the WDI pin, or when MR is pulled low. After clearing, the timer restarts upon reset deassertion. Unlike non-A versions, the A-version (denoted by 'A' in MAX6703A) allows WDO to deassert immediately when undervoltage ends - but WDO remains latched low after actual watchdog timeout until a WDI edge or MR low occurs.
Can MAX6703AZKA+ generate a reset pulse from the power-fail comparator?
Yes - connect PFO to MR to trigger a reset pulse when PFI drops below 0.62V. This configuration uses the power-fail comparator as an independent reset source for secondary supplies. The resulting RESET pulse duration matches the standard 140ms timeout period and is fully synchronized with other reset sources (VCC, RST_IN1, RST_IN2, MR).
MAX6703AZKA+ 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:
- 3
- Voltage - Threshold:
- 2.32V, Adj, 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
MAX6703AZKA+ FAQ
1.How can I place an order for MAX6703AZKA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6703AZKA+ 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 MAX6703AZKA+ reliable?
The price and inventory of MAX6703AZKA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6703AZKA+ is usually 5 days.
3.What payment methods are accepted for MAX6703AZKA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6703AZKA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6703AZKA+?
MAX6703AZKA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6703AZKA+ 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 MAX6703AZKA+?
For technical support, including MAX6703AZKA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6703AZKA+ requirements.
6.How does Aetrix verify that MAX6703AZKA+ is sourced from the original manufacturer or authorized distributors?
All MAX6703AZKA+ 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 MAX6703AZKA+ meets industry standards.
7.What is the process for return or replacement of MAX6703AZKA+?
All MAX6703AZKA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6703AZKA+, 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 MAX6703AZKA+ part is unused and in its original packaging.
Return procedure for MAX6703AZKA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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