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Analog Devices Inc./Maxim Integrated MAX6702ARKA+
- Part No.:
- MAX6702ARKA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-8
- Datasheet:
-
MAX6702ARKA+.pdf
- Description:
- IC SUPERVISOR 3 CHANNEL SOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:2,219
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Product details
Overview
MAX6702ARKA+ from Maxim Integrated is an active-high push-pull microprocessor supervisory IC that monitors +3.0V supply voltage with 2.93V reset threshold, provides 140ms reset timeout, independent watchdog output (WDO), manual reset input (MR), and power-fail comparator (PFI/PFO). It ensures reliable µP startup and brownout protection in embedded controllers and intelligent instruments.
For engineers reviewing the MAX6702ARKA+ datasheet, MAX6702ARKA+ pinout, MAX6702ARKA+ application, or MAX6702ARKA+ equivalent, this page delivers verified functional identity, SOT23-8 pin mapping, exact reset threshold (2.93V), watchdog timeout (1.6s), power-fail detection (0.62V reference), and validated alternatives for triple-voltage supervision designs.
Technical Context
The MAX6702ARKA+ implements a dual-comparator architecture: one fixed-threshold monitor for VCC (2.93V) and an independent 0.62V reference comparator for PFI, enabling early power-fail warning. Its reset generator guarantees valid output down to VCC = 1V and includes glitch rejection on MR (100ns).
The integrated watchdog timer asserts WDO low after 1.6s of no WDI edge transition, and deasserts immediately upon valid WDI toggle or MR pull-low - a key behavioral distinction from non-A versions. Reset assertion occurs on VCC drop, MR low, or watchdog timeout, with 140ms minimum pulse width.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.93V (typ) at VCC falling; precise for +3.0V systems with ±30mV tolerance over -40°C to +125°C |
| Reset Timeout Period | 140ms (min); ensures µP completes internal initialization before release |
| Watchdog Timeout | 1.6s (typ); provides sufficient margin for firmware execution cycles without false triggers |
| Power-Fail Threshold | 0.62V (typ) on PFI; enables adjustable early-warning detection via external resistor divider |
| Supply Voltage Range | 1.2V to 5.5V; supports operation during deep brownout while maintaining reset validity |
| Output Type | Active-high push-pull RESET and active-low push-pull WDO; eliminates need for external pull-ups |
| Quiescent Current | 9µA (typ) at VCC < 3.6V; enables ultra-low-power system monitoring |
Pinout & Package
MAX6702ARKA+ is housed in an 8-pin SOT23 package (package code K8+2), RoHS-compliant, with 0.65mm pitch and thermal pad omitted. Dimensions: 2.9mm × 1.6mm × 1.1mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 MR | Active-low manual reset input | CMOS-compatible; internal 50kΩ pullup to VCC; forces reset when pulled low; debounces pushbutton switches |
| 2 VCC | Main supply input | Primary reset threshold monitor input; powers push-pull outputs; valid from 1.2V to 5.5V |
| 3 GND | Ground reference | Common return for all analog and digital circuitry; must be low-impedance connection |
| 4 PFI | Power-fail input | High-impedance comparator input referenced to 0.62V; accepts external voltage divider for custom trip points |
| 5 PFO | Power-fail output | Active-low push-pull output; asserts when PFI < 0.62V; drives µP interrupt or sequencer control directly |
| 6 WDI | Watchdog input | Edge-sensitive input; rising or falling edge clears watchdog timer; 50ns minimum pulse width supported |
| 7 RESET | Active-high reset output | Push-pull output asserted high during reset condition; guaranteed logic high down to VCC = 1V |
| 8 WDO | Active-low watchdog output | Independent watchdog status flag; latched low on timeout; cleared by WDI edge or MR low |
Key Features
| Feature | Design Value |
|---|---|
| Active-high push-pull RESET | Eliminates external pull-up resistor; reduces BOM count and PCB area in +3.0V µP systems |
| Independent WDO with immediate deassertion | Enables real-time watchdog status monitoring without delay; supports NMI-based fault logging |
| 0.62V precision PFI reference | Allows accurate power-fail warning down to 0.9V input rails using standard resistor values |
| Guaranteed reset validity to VCC = 1V | Ensures deterministic µP reset state during deep undervoltage events common in battery-backed systems |
| 100ns MR glitch rejection | Rejects EMI-induced noise on manual reset lines without requiring RC filtering or firmware debounce |
Applications
| Industrial Controllers | Intelligent Instruments |
|---|---|
Use Scenario: Programmable logic controllers (PLCs) operating in factory environments with fluctuating 24V DC supplies stepped down to +3.0V logic rails. IC Role / Device Role / Timing Role: Supervises +3.0V core supply and provides early power-fail warning via PFI/PFO to initiate safe I/O shutdown before main rail collapse. Use Value: Prevents corrupted register states and latch-up during brownout by guaranteeing 140ms reset hold time and asserting RESET high only when VCC ≥ 2.93V. |
Use Scenario: Portable handheld test equipment powered by Li-ion batteries discharging from 4.2V to 2.8V, regulating +3.0V for µP and ADC. IC Role / Device Role / Timing Role: Monitors regulated +3.0V rail and uses PFI to detect battery sag below 3.0V, triggering PFO to alert µP for low-battery save routines. Use Value: Enables graceful shutdown with >100ms warning margin before brownout, leveraging 0.62V reference and 140ms reset timeout for deterministic recovery. |
| White Goods Control Boards | Networking Edge Devices |
Use Scenario: Washing machine main control board with +3.0V MCU supply derived from isolated flyback converter subject to load transients. IC Role / Device Role / Timing Role: Provides VCC supervision and watchdog monitoring of MCU firmware execution; WDO connected to NMI pin for fault diagnostics. Use Value: Detects MCU lockup within 1.6s and initiates controlled reset via MR-WDO feedback loop, preventing unsafe motor actuation. |
Use Scenario: Small-form-factor Ethernet switch with +3.0V PHY and µP supply, exposed to ESD and line surges causing transient dips. IC Role / Device Role / Timing Role: Ensures µP remains held in reset during 10–100µs supply glitches via 12µs VCC-to-RESET delay and 100ns MR glitch rejection. Use Value: Maintains system integrity under EMI stress without false resets, validated across -40°C to +125°C industrial temperature range. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervision applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6702MKA+ | Fixed 4.38V reset threshold (for +4.5V systems); identical pinout, timing, and feature set | Designed for +5.0V/±5% supply monitoring instead of +3.0V; not interchangeable without redesigning voltage divider networks | Select MAX6702MKA+ only when supervising +4.5V rails; verify VCC operating range compatibility before substitution |
| MAX6706ARKA+ | Same 2.93V threshold and SOT23-8 package, but active-high RESET with push-pull output and independent PFI/PFO comparator | Includes dual-supply monitoring capability (VCC + PFI) with same timing; differs in watchdog behavior (WDO deasserts on WDI edge only) | Prefer MAX6706ARKA+ if additional power-fail monitoring on secondary rail is required; otherwise MAX6702ARKA+ suffices for single-rail +3.0V supervision |
Compared with MAX6702MKA+, MAX6702ARKA+ targets lower-voltage systems with tighter threshold tolerance; compared with MAX6706ARKA+, it omits RST_IN1/RST_IN2 inputs but retains identical PFI/PFO functionality and watchdog response - making it optimal for cost-sensitive +3.0V-only applications.
Availability
MAX6702ARKA+ is available at Aetrix Electronics and suitable for industrial controllers, intelligent instruments, and white goods requiring stable component supply across extended temperature ranges (-40°C to +125°C) and long production lifecycles.
Supply support for MAX6702ARKA+ 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 MAX670x family delivers compact, low-power µP supervision with integrated watchdog, power-fail detection, and manual reset - engineered specifically for space-constrained embedded systems needing guaranteed reset behavior across wide temperature and voltage ranges.
FAQ
What is the exact reset threshold voltage for MAX6702ARKA+ and how is it specified?
The MAX6702ARKA+ has a nominal reset threshold of 2.93V (typical) with guaranteed limits of 2.85V (min) and 3.00V (max) over the full -40°C to +125°C temperature range. This value is fixed and corresponds to the 'S' suffix in the Threshold Suffix Guide, making it optimized for reliable supervision of +3.0V supply rails.
Does MAX6702ARKA+ support active-high reset output, and what is its drive capability?
Yes, MAX6702ARKA+ provides an active-high push-pull RESET output (pin 7). It sources up to 500µA at VCC ≥ 2.7V while maintaining VOH ≥ 0.8 × VCC, enabling direct interface with µP reset inputs without external pull-up resistors - a key differentiator from open-drain alternatives.
How does the watchdog timer in MAX6702ARKA+ respond to WDI transitions and MR assertion?
In MAX6702ARKA+, the watchdog timer clears on any WDI edge (rising or falling) or when MR is pulled low. WDO deasserts immediately upon either event - unlike non-A versions - enabling rapid fault recovery. The timeout period is 1.6s (typ), with guaranteed range of 0.96s to 2.52s across temperature.
Can MAX6702ARKA+ monitor voltages other than VCC, and how is PFI used?
Yes, MAX6702ARKA+ uses PFI (pin 4) as a high-impedance input referenced to an internal 0.62V comparator. By connecting an external resistor divider to PFI, designers can monitor secondary supplies (e.g., 1.8V, 2.5V, or battery voltage) and generate early warnings via PFO (pin 5) before VCC brownout occurs.
What is the minimum VCC level at which MAX6702ARKA+ guarantees valid RESET output operation?
MAX6702ARKA+ guarantees valid RESET output down to VCC = 1.0V. Below this, the output becomes high-impedance. This specification ensures deterministic reset behavior during deep brownout conditions typical in battery-powered or unregulated supply systems, supporting robust fail-safe operation.
MAX6702ARKA+ 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:
- 3
- Voltage - Threshold:
- 2.63V, Adj, Adj
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active High
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-8
MAX6702ARKA+ FAQ
1.How can I place an order for MAX6702ARKA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6702ARKA+ 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 MAX6702ARKA+ reliable?
The price and inventory of MAX6702ARKA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6702ARKA+ is usually 5 days.
3.What payment methods are accepted for MAX6702ARKA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6702ARKA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6702ARKA+?
MAX6702ARKA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6702ARKA+ 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 MAX6702ARKA+?
For technical support, including MAX6702ARKA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6702ARKA+ requirements.
6.How does Aetrix verify that MAX6702ARKA+ is sourced from the original manufacturer or authorized distributors?
All MAX6702ARKA+ 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 MAX6702ARKA+ meets industry standards.
7.What is the process for return or replacement of MAX6702ARKA+?
All MAX6702ARKA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6702ARKA+, 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 MAX6702ARKA+ part is unused and in its original packaging.
Return procedure for MAX6702ARKA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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