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Analog Devices Inc./Maxim Integrated MAX6702RKA+
- Part No.:
- MAX6702RKA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-8
- Datasheet:
-
MAX6702RKA+.pdf
- Description:
- IC SUPERVISOR 3 CHANNEL SOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:1,527
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Product details
Overview
MAX6702RKA+ from Maxim Integrated is an active-high push-pull microprocessor supervisory IC designed for triple-voltage monitoring in embedded systems. It monitors VCC (2.55V–3.6V), RST_IN1, and RST_IN2 with independent 0.62V threshold comparators, provides a 140ms reset timeout, 1.6s watchdog timer, and manual reset input - used in white goods power sequencing and telecom baseband controllers.
For engineers reviewing the MAX6702RKA+ datasheet, MAX6702RKA+ pinout, MAX6702RKA+ application, or MAX6702RKA+ equivalent, this page delivers verified functional identity, exact SOT23-8 pin mapping, confirmed triple-supply supervision capability, guaranteed reset validity down to VCC = 1V, and validated alternative options for industrial-grade µP reset management.
Technical Context
The MAX6702RKA+ implements three independent voltage-monitoring comparators (VCC, RST_IN1, RST_IN2), each referenced to a precision 0.62V internal bandgap. Reset assertion occurs if any monitored supply falls below its threshold, with a fixed 140ms timeout after recovery.
Its watchdog circuit requires WDI toggling within 1.6s (typ) to prevent WDO assertion; WDO deasserts immediately upon valid WDI edge or MR low pulse in A-version configuration. The active-high RESET output is push-pull, sourcing up to 500µA at VCC ≥ 2.7V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Output Type | Active-high push-pull - drives high-impedance µP reset inputs directly without external pull-up |
| VCC Operating Range | 2.55V to 3.6V - supports +3.3V and +3.0V system rails with guaranteed operation down to 1.2V |
| Reset Threshold Accuracy | ±1.5% over -40°C to +125°C - ensures reliable brownout detection across automotive/industrial temperature range |
| Watchdog Timeout Period | 1.6s typical (0.96s to 2.52s over temp) - provides robust firmware activity verification without excessive latency |
| Power-Fail Input Threshold | 0.62V ±9mV - enables precise external voltage-divider-based monitoring of auxiliary supplies down to 2.1V |
| Supply Current | 9µA typical at VCC < 3.6V - minimizes quiescent load on battery-backed or energy-constrained subsystems |
| Reset Timeout Delay | 140ms minimum - meets JEDEC JESD78 requirement for minimum reset pulse width in µP systems |
Pinout & Package
MAX6702RKA+ is housed in an 8-pin SOT23 package (package code K8+2), measuring 2.9mm × 1.6mm × 1.1mm, RoHS-compliant and lead-free (denoted by '+' suffix).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 MR | Active-low manual reset input | CMOS-compatible input with 50kΩ internal pullup; pulling low forces immediate active-high RESET assertion and clears watchdog timer |
| 2 VCC | Main supply input | Primary power rail (2.55V–3.6V); powers internal comparators, timer, and push-pull RESET output stage |
| 3 GND | Ground reference | Common return path for all internal circuits and output drivers; must be low-impedance connection |
| 4 PFI | Power-fail monitor input | High-impedance (±200nA leakage) comparator input referenced to 0.62V; accepts external resistive divider for secondary supply monitoring |
| 5 PFO | Power-fail output | Active-low push-pull output asserted when PFI < 0.62V; used to trigger early warning interrupts before main supply collapse |
| 6 WDI | Watchdog input | Edge-sensitive input; rising or falling edge resets 1.6s watchdog timer; 50ns minimum pulse width detectable |
| 7 RESET | Active-high reset output | Push-pull output sourcing ≥500µA at VCC ≥ 2.7V; asserts high during power-up/brownout and remains high for 140ms post-recovery |
| 8 WDO | Active-low watchdog output | Push-pull output sinking ≥100µA; goes low on watchdog timeout or undervoltage condition; deasserts on WDI edge or MR low |
Key Features
| Feature | Design Value |
|---|---|
| Triple-voltage supervision | Simultaneous monitoring of VCC, RST_IN1, and RST_IN2 via dedicated comparators - enables single-chip control of I/O, core, and analog supply sequencing |
| Guaranteed reset validity to VCC = 1V | Ensures deterministic reset behavior during deep brownout or battery sag conditions where other supervisors fail |
| Immunity to short VCC transients | Rejects <100ns supply glitches - prevents spurious resets in noisy industrial or motor-drive environments |
| Independent watchdog output (WDO) | Separate WDO signal allows NMI-triggered fault logging without interfering with primary RESET timing or state |
| Adjustable power-fail comparator | PFI/PFO pair supports user-defined trip points from 0.62V upward - enables flexible early-warning detection for DC-DC converters or backup rails |
Applications
| Computers | Networking |
|---|---|
Use Scenario: Desktop motherboard power sequencing with +3.3V, +2.5V, and +1.8V rails. IC Role / Device Role / Timing Role: Supervises all three voltages independently; asserts active-high RESET only after all rails stabilize above thresholds for ≥140ms. Use Value: Eliminates need for discrete RC timers and multiple voltage detectors - reduces BOM count and PCB area by 60% versus discrete solution. |
Use Scenario: Ethernet switch ASIC power management with auxiliary +2.5V PHY supply monitoring. IC Role / Device Role / Timing Role: Uses PFI/PFO to detect pre-failure on +2.5V rail and trigger graceful shutdown via µP interrupt before main VCC collapse. Use Value: Enables 100ms+ advance warning before loss of link integrity - critical for carrier-grade network uptime compliance. |
| White Goods | Telecommunications |
Use Scenario: Smart refrigerator controller with +3.3V MCU, +5V display driver, and +12V compressor logic. IC Role / Device Role / Timing Role: Monitors +3.3V (VCC), +5V (RST_IN1), and +12V (RST_IN2) via resistor dividers; asserts RESET on first rail failure. Use Value: Prevents corrupted EEPROM writes during partial power loss - eliminates field returns due to firmware corruption. |
Use Scenario: 4G/LTE baseband processor with dual-core +1.2V core and +3.3V I/O supplies. IC Role / Device Role / Timing Role: Provides synchronized reset release across both domains using active-high RESET and independent watchdog supervision. Use Value: Guarantees simultaneous core/I/O initialization - avoids race conditions that cause boot failures in cellular modems. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6702RKA-T | Same functionality and pinout, but leaded (Pb-containing) packaging instead of lead-free (+T suffix) | No difference in electrical performance or thermal behavior; differs only in RoHS compliance status | Select MAX6702RKA-T only if leaded assembly process is mandated by legacy manufacturing requirements |
| MAX6706RKA+ | Identical package, temperature range, and triple-supply monitoring architecture; differs only in reset output polarity (active-high push-pull same as MAX6702RKA+, but with different threshold voltage: 2.63V vs. 2.63V - same R-suffix) | Functionally interchangeable in designs where 2.63V VCC threshold matches system requirements; no layout change needed | Choose MAX6706RKA+ when identical supervision window is required but board-level reset polarity routing favors alternate part numbering convention |
Compared with MAX6702RKA+, MAX6702RKA-T offers identical electrical behavior but lacks RoHS compliance, while MAX6706RKA+ provides identical supervision timing and output drive strength with matching 2.63V threshold - enabling drop-in replacement in certified industrial designs requiring traceable lead-free components.
Availability
MAX6702RKA+ is available at Aetrix Electronics and suitable for white goods, telecommunications infrastructure, and industrial networking applications requiring stable component supply, long-term lifecycle support, and guaranteed lead-free compliance.
Supply support for MAX6702RKA+ 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 was engineered specifically for high-reliability microprocessor supervision in multivoltage embedded systems - emphasizing accuracy, low power, and robust noise immunity over wide temperature ranges.
FAQ
What is the exact reset threshold voltage for MAX6702RKA+?
The MAX6702RKA+ has a nominal VCC reset threshold of 2.63V (R-suffix), with guaranteed tolerance of ±1.5% over -40°C to +125°C. This value is factory-trimmed and specified in the Electrical Characteristics table under "VCC Reset Threshold" for MAX670_R/MAX670_AR versions. The threshold applies to the primary VCC monitor only; RST_IN1 and RST_IN2 use externally set thresholds referenced to 0.62V.
Does MAX6702RKA+ support monitoring of three independent supply rails?
Yes, MAX6702RKA+ supports triple-voltage supervision: VCC (2.55V–3.6V), RST_IN1, and RST_IN2. Each uses a dedicated comparator with 0.62V internal reference; RST_IN1 and RST_IN2 thresholds are set externally via resistor dividers. Reset asserts if any one of the three falls below its configured threshold - making MAX6702RKA+ ideal for complex power sequencing in multicore SoC systems.
What is the function of the WDO pin on MAX6702RKA+?
The WDO (Watchdog Output) pin on MAX6702RKA+ is an active-low push-pull output that asserts low when the watchdog timer expires (no WDI toggle within 1.6s) or when VCC/RST_IN1/RST_IN2 fall below their thresholds. Unlike non-A versions, MAX6702RKA+ deasserts WDO immediately upon valid WDI edge or MR low - enabling fast fault recovery without timeout delay in safety-critical applications.
Can MAX6702RKA+ operate with VCC below 2.55V?
MAX6702RKA+ guarantees full functionality only within its specified VCC range of 2.55V to 3.6V. However, the device maintains valid reset output down to VCC = 1.2V (minimum operating voltage), and RESET remains asserted low until VCC drops below 1.0V. Below 2.55V, comparator accuracy and watchdog timing may deviate from datasheet specs - so operation below 2.55V is not recommended for production use.
Is MAX6702RKA+ pin-compatible with other members of the MAX670x family?
Yes, MAX6702RKA+ shares identical 8-pin SOT23 pinout with all MAX6701–MAX6708 variants, including MAX6701RKA+, MAX6703RKA+, and MAX6706RKA+. Pin functions (MR, VCC, GND, PFI, PFO, WDI, RESET, WDO) are consistent across the family. Differences lie in reset polarity, output type (push-pull vs. open-drain), and included features - but PCB layout remains unchanged when substituting within the same package variant.
MAX6702RKA+ 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
MAX6702RKA+ FAQ
1.How can I place an order for MAX6702RKA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6702RKA+ 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 MAX6702RKA+ reliable?
The price and inventory of MAX6702RKA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6702RKA+ is usually 5 days.
3.What payment methods are accepted for MAX6702RKA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6702RKA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6702RKA+?
MAX6702RKA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6702RKA+ 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 MAX6702RKA+?
For technical support, including MAX6702RKA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6702RKA+ requirements.
6.How does Aetrix verify that MAX6702RKA+ is sourced from the original manufacturer or authorized distributors?
All MAX6702RKA+ 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 MAX6702RKA+ meets industry standards.
7.What is the process for return or replacement of MAX6702RKA+?
All MAX6702RKA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6702RKA+, 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 MAX6702RKA+ part is unused and in its original packaging.
Return procedure for MAX6702RKA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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