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Analog Devices Inc./Maxim Integrated MAX6702ARKA+T
- Part No.:
- MAX6702ARKA+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-8
- Datasheet:
-
MAX6702ARKA+T.pdf
- Description:
- IC SUPERVISOR 3 CHANNEL SOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:2,500
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Product details
Overview
MAX6702ARKA+T from Maxim Integrated is an active-high push-pull microprocessor supervisory IC designed for triple-voltage monitoring in embedded systems. It monitors VCC, RST_IN1, and RST_IN2 with a 2.93V fixed VCC reset threshold (suffix 'R'), provides 140ms reset timeout, 1.6s watchdog timeout, and independent power-fail detection via PFI/PFO. It serves critical µP power monitoring in white goods and telecom infrastructure.
For engineers reviewing the MAX6702ARKA+T datasheet, MAX6702ARKA+T pinout, MAX6702ARKA+T application, or MAX6702ARKA+T equivalent, key selection factors include its active-high reset output, dual adjustable reset inputs for multivoltage supervision, guaranteed reset validity down to VCC = 1V, immunity to short VCC transients, and lead-free SOT23-8 packaging.
Technical Context
The MAX6702ARKA+T implements a triple-threshold supervision architecture: one fixed internal comparator for VCC (2.93V), plus two high-impedance adjustable inputs (RST_IN1/RST_IN2) referenced to a 0.62V internal bandgap. Reset assertion occurs if any monitored voltage falls below its threshold, with a 140–300ms timeout period after recovery.
Its watchdog timer requires WDI toggling within 1.6s (typ) to prevent WDO assertion; WDO is push-pull active-low and latches on timeout but deasserts immediately upon valid WDI edge or MR low in A-version. The power-fail comparator (PFI→PFO) operates independently with 1µs propagation delay and 6mV hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Reset Threshold | 2.93V (fixed, ±3% over -40°C to +125°C) - sets primary supply brownout detection point |
| Reset Timeout Period | 140ms (min) to 300ms (max) - ensures µP remains held in reset long enough for stable power recovery |
| Watchdog Timeout | 1.6s (typ), 0.96–2.52s (range) - defines maximum allowed µP activity gap before system-level intervention |
| PFI Threshold | 0.62V (typ), ±9mV over temp - enables precise external voltage-divider-based power-fail warning at custom supply rails |
| Supply Current | 9–20µA (VCC < 3.6V) - ultra-low quiescent draw suitable for battery-backed or energy-sensitive systems |
| Operating Voltage Range | 1.2V to 5.5V - supports supervision of modern low-voltage µPs and legacy 5V logic |
| Reset Output Type | Active-high push-pull - eliminates need for external pull-up resistor; drives µP reset input directly |
Pinout & Package
MAX6702ARKA+T is housed in an 8-pin SOT23 package (package code K8+2), measuring 2.9mm × 1.6mm × 1.1mm, RoHS-compliant and lead-free (indicated by '+T' suffix).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 MR | Active-low manual reset input | CMOS-compatible input with 50kΩ internal pullup; forces reset when pulled low; debounces pushbutton switches |
| 2 VCC | Main supply input | Power source for internal circuitry and reset output driver; also primary voltage monitor input |
| 3 GND | Ground reference | Common return path for all internal comparators, timers, and output drivers |
| 4 PFI | Power-fail input | High-impedance node for external resistive divider; triggers PFO when voltage drops below 0.62V |
| 5 PFO | Power-fail output | Active-low push-pull output; signals impending supply collapse to µP interrupt or sequencer |
| 6 WDI | Watchdog input | Edge-sensitive input; must toggle within 1.6s to prevent WDO assertion; 50ns minimum pulse width |
| 7 RESET | Active-high reset output | Push-pull output asserted high during reset condition; valid down to VCC = 1V |
| 8 WDO | Active-low watchdog output | Independent push-pull output asserted on watchdog timeout or undervoltage; deasserts on WDI edge or MR low |
Key Features
| Feature | Design Value |
|---|---|
| Triple-voltage supervision | Simultaneously monitors VCC + two user-adjustable supplies (RST_IN1/RST_IN2) using single IC |
| Guaranteed reset validity to 1V | Ensures reliable µP reset assertion even during deep brownout or battery depletion scenarios |
| Immunity to short VCC transients | Rejects sub-100ns supply dips, preventing false resets in noisy power environments |
| Independent power-fail comparator | Enables early-warning shutdown sequencing without affecting main reset timing or watchdog behavior |
| Manual reset with internal pullup | Reduces BOM count by eliminating external pullup resistor; simplifies pushbutton interface design |
Applications
| Industrial Motor Control | Smart Energy Metering |
|---|---|
Use Scenario: Real-time motor drive firmware executing safety-critical routines under variable AC line conditions. IC Role / Device Role / Timing Role: Supervises 3.3V logic rail, 2.5V ADC reference, and 5V gate driver supply; asserts active-high RESET to halt execution on any rail collapse. Use Value: Prevents erratic gate drive signals during brownout, avoiding shoot-through and IGBT failure. |
Use Scenario: Battery-backed metrology SoC sampling grid voltage/current while maintaining RTC and flash integrity. IC Role / Device Role / Timing Role: Monitors main 3.3V supply and backup 1.8V rail; uses PFI/PFO to trigger orderly data save before main power loss. Use Value: Enables >99.9% data retention reliability during grid interruptions lasting up to 500ms. |
| Telecom Base Station PSU | White Goods MCU Subsystem |
Use Scenario: Distributed power management across RF, baseband, and control modules in 4G/5G remote radio units. IC Role / Device Role / Timing Role: Provides synchronized reset to multiple voltage domains (12V DC-DC bias, 3.3V FPGA, 1.2V core); WDO feeds FPGA watchdog logic. Use Value: Eliminates need for discrete reset generators per rail, reducing PCB area by 35% and improving timing correlation. |
Use Scenario: Washing machine main controller managing motor, heater, and display under fluctuating household AC input. IC Role / Device Role / Timing Role: Supervises 5V system rail, 3.3V MCU core, and 2.5V sensor interface; MR tied to door latch switch for safety reset. Use Value: Guarantees safe state entry on power interruption or mechanical fault, meeting IEC 60335-1 Class II requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervision applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6702MKA+T | 4.38V VCC reset threshold (suffix 'M') vs. 2.93V ('R'); identical pinout, timing, and feature set | Designed for +5V legacy systems rather than +3.3V/+2.5V modern MCUs | Select when supervising 5V logic rails where higher threshold prevents nuisance resets during nominal ripple |
| MAX6706ARKA+T | Same 2.93V threshold and triple-supply monitoring, but adds open-drain PFO and RST_IN2 support; differs in RESET polarity (active-high push-pull retained) | Offers enhanced flexibility for mixed-signal systems requiring isolated power-fail signaling or third-rail monitoring | Choose when PFO must drive optocouplers or level-shifted interfaces, or when third adjustable supply monitoring is required beyond RST_IN1 |
Compared with MAX6702ARKA+T, MAX6702MKA+T shifts reset activation to higher supply levels for robustness in noisy 5V environments, while MAX6706ARKA+T extends functionality with open-drain PFO and full RST_IN2 support-both retain identical footprint and core supervision timing but serve distinct voltage architecture needs.
Availability
MAX6702ARKA+T is available at Aetrix Electronics and suitable for industrial motor control, smart energy metering, telecom base station power supplies, and white goods MCU subsystems requiring stable component supply across extended temperature ranges (-40°C to +125°C).
Supply support for MAX6702ARKA+T 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 multivoltage monitoring for space-constrained embedded systems.
FAQ
What is the reset output polarity and drive type of MAX6702ARKA+T?
The MAX6702ARKA+T features an active-high push-pull reset output (RESET pin). This means it drives high during normal operation and pulls low only during reset assertion. Unlike open-drain variants, it requires no external pull-up resistor and guarantees valid logic levels down to VCC = 1V, making it ideal for direct connection to µP reset inputs in low-voltage systems.
How does the watchdog function behave in MAX6702ARKA+T during power-up and reset events?
In MAX6702ARKA+T, the watchdog timer remains cleared while RESET is asserted and begins counting only after RESET deasserts. If WDI is not toggled within 1.6s (typ), WDO goes low. Critically, WDO deasserts immediately upon a valid WDI edge or MR low-no timeout delay-enabling rapid recovery from transient faults without waiting for full watchdog period expiration.
Can MAX6702ARKA+T monitor voltages other than VCC, and how is that configured?
Yes, MAX6702ARKA+T monitors two additional supplies via RST_IN1 and RST_IN2 pins, each referenced to an internal 0.62V comparator. To supervise a 5V rail, for example, connect a resistor divider between that rail and GND such that the divider midpoint equals 0.62V at the trip point. The device asserts reset if any of VCC, RST_IN1, or RST_IN2 falls below its respective threshold.
What is the significance of the 'R' suffix in MAX6702ARKA+T, and how does it affect system design?
The 'R' suffix in MAX6702ARKA+T specifies a 2.55V to 2.70V VCC reset threshold range (2.63V typical), optimized for +2.5V and +3.3V logic supplies. This ensures reliable brownout detection before critical MCU peripherals lose functionality, unlike higher-threshold versions (e.g., 'M' = 4.38V) suited for 5V systems. Selecting 'R' avoids premature resets in modern low-voltage designs.
Does MAX6702ARKA+T support operation at temperatures beyond commercial grade?
Yes, MAX6702ARKA+T is rated for continuous operation from -40°C to +125°C ambient temperature, qualified per automotive and industrial standards. Its electrical parameters-including reset threshold accuracy (±3%), watchdog timeout (0.96–2.52s), and supply current (9–20µA)-are fully specified across this extended range, enabling deployment in engine control units, outdoor telecom gear, and industrial PLCs without derating.
MAX6702ARKA+T 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+T FAQ
1.How can I place an order for MAX6702ARKA+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6702ARKA+T 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+T reliable?
The price and inventory of MAX6702ARKA+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6702ARKA+T is usually 5 days.
3.What payment methods are accepted for MAX6702ARKA+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6702ARKA+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6702ARKA+T?
MAX6702ARKA+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6702ARKA+T 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+T?
For technical support, including MAX6702ARKA+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6702ARKA+T requirements.
6.How does Aetrix verify that MAX6702ARKA+T is sourced from the original manufacturer or authorized distributors?
All MAX6702ARKA+T 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+T meets industry standards.
7.What is the process for return or replacement of MAX6702ARKA+T?
All MAX6702ARKA+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6702ARKA+T, 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+T part is unused and in its original packaging.
Return procedure for MAX6702ARKA+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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