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Analog Devices Inc./Maxim Integrated MAX6702ASKA+
- Part No.:
- MAX6702ASKA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-8
- Datasheet:
-
MAX6702ASKA+.pdf
- Description:
- IC SUPERVISOR 3 CHANNEL SOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:4,558
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Product details
Overview
MAX6702ASKA+ from Maxim Integrated is an active-high push-pull microprocessor supervisory IC designed for triple-voltage monitoring in embedded systems. It monitors VCC (adjustable 2.85V threshold), RST_IN1, and RST_IN2 with independent reset generation, features a 140ms reset timeout, 1.6s watchdog timer, and 0.62V power-fail comparator input-used in white goods power sequencing and telecom baseband controllers.
For engineers reviewing the MAX6702ASKA+ datasheet, MAX6702ASKA+ pinout, MAX6702ASKA+ application, or MAX6702ASKA+ 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 alternatives for industrial-grade µP reset management.
Technical Context
The MAX6702ASKA+ implements a dual adjustable-reset-input architecture: RST_IN1 and RST_IN2 accept external resistor dividers to set user-defined thresholds referenced to an internal 0.62V bandgap, enabling precise monitoring of secondary and tertiary supply rails alongside VCC. Its active-high RESET output is driven by a push-pull stage with VOH ≥ 0.8×VCC at ISOURCE = 500µA.
Watchdog functionality operates independently of reset assertion: WDI edge detection clears the 1.6s timeout counter, and WDO asserts low on overflow or undervoltage (VCC/RST_IN1/RST_IN2 < threshold); WDO deasserts immediately upon recovery in A-version devices. Power-fail warning uses PFI–PFO path with 1µs propagation delay and 6mV hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Output Type | Active-high push-pull - drives high without external pull-up; valid down to VCC = 1V |
| VCC Reset Threshold | 2.85V (typ), ±1.5% over -40°C to +125°C - matches +2.85V/3.0V system rails |
| Reset Timeout Period | 140ms (min) to 280ms (max) - ensures reliable µP initialization after brownout recovery |
| Watchdog Timeout | 1.6s (typ), 0.96s to 2.52s over temperature - provides robust firmware activity monitoring |
| PFI Threshold Voltage | 0.62V (typ), ±15mV over temp - enables accurate power-fail warning via external divider |
| Supply Current | 9µA (typ) at VCC < 3.6V - supports ultra-low-power always-on supervision |
| Operating Temperature | -40°C to +125°C - qualified for automotive under-hood and industrial control environments |
Pinout & Package
MAX6702ASKA+ 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 '+' suffix).
| 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 and primary reset monitor input | Power source for internal circuitry and reference; monitored against 2.85V threshold |
| 3 GND | Ground reference | Common return for all analog and digital functions; must be low-impedance |
| 4 PFI | Power-fail voltage monitor input | High-impedance node (±200nA leakage); connects to external divider for 0.62V-referenced trip point |
| 5 PFO | Power-fail output | Active-low push-pull; asserts when PFI < 0.62V; used for early-warning interrupt to µP |
| 6 WDI | Watchdog input | Edge-sensitive (50ns min pulse); toggling resets 1.6s timer; no level-hold requirement |
| 7 RESET | Active-high reset output | Push-pull driver; goes high when all monitored supplies exceed thresholds; holds for 140–280ms |
| 8 WDO | Active-low watchdog output | Independent of RESET; asserts on WDI timeout or VCC/RST_IN undervoltage; deasserts immediately on recovery (A-version) |
Key Features
| Feature | Design Value |
|---|---|
| Dual adjustable reset inputs (RST_IN1/RST_IN2) | Enables simultaneous monitoring of three independent supply rails using single IC and external resistive dividers |
| Guaranteed reset validity to VCC = 1V | Ensures deterministic reset behavior during deep brownout or battery sag conditions without external support circuitry |
| Immunity to short falling VCC transients | Rejects <100ns glitches on VCC - prevents spurious resets in noisy power environments |
| 1.6s watchdog with immediate WDO recovery (A-version) | Eliminates fixed delay on undervoltage clearance - critical for fast-recovery telecom and networking applications |
| 0.62V precision power-fail comparator | Supports accurate early-warning detection of secondary supply collapse (e.g., 3.3V I/O rail before 1.2V core fails) |
Applications
| Industrial PLC Controllers | Telecom Baseband Units |
|---|---|
|
Use Scenario: Monitoring 3.3V I/O, 2.5V auxiliary, and 1.8V core rails in modular programmable logic controller backplanes. IC Role / Device Role / Timing Role: Triple-voltage supervisor providing synchronized active-high RESET to ARM Cortex-M7 MCU and FPGA configuration logic. Use Value: Eliminates need for three discrete reset ICs; reduces BOM count and PCB area while guaranteeing coordinated power-up sequencing. |
Use Scenario: Supervising +2.85V DSP supply, +1.2V RF synthesizer bias, and +3.3V Ethernet PHY in LTE small-cell radio units. IC Role / Device Role / Timing Role: Active-high RESET generator with independent WDO for NMI-triggered firmware watchdog escalation. Use Value: Enables fail-safe reboot on DSP lockup without disrupting Ethernet link state via isolated WDO path. |
| White Goods Main Control Boards | Networking Switch Management Cards |
|
Use Scenario: Power supervision for refrigerator main board with +5V display, +3.3V sensor interface, and +1.8V MCU supply. IC Role / Device Role / Timing Role: Triple-supply monitor with manual reset (MR) for service-mode entry and PFO-driven orderly shutdown. Use Value: Integrates power-fail warning, reset generation, and service reset into one 8-pin SOT23 - simplifies CE-compliant safety design. |
Use Scenario: Supervising +2.85V switch ASIC, +1.2V SerDes, and +3.3V management MCU in enterprise layer-3 switches. IC Role / Device Role / Timing Role: High-temperature-stable (−40°C to +125°C) supervisor ensuring reliable boot under thermal stress. Use Value: Maintains reset integrity across full industrial temperature range - avoids field failures due to marginal brownout timing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6702MSKA+ | Fixed 3.08V VCC threshold (vs. 2.85V); identical pinout, timing, and feature set | Suitable for +3.0V or +3.3V systems requiring tighter threshold tolerance | Select when system VCC nominal is ≥3.0V and 2.85V threshold risks premature reset assertion |
| TPS3808G33DBVR | Single-supply monitor (no RST_IN1/RST_IN2); 3.3V fixed threshold; 200ms reset timeout; no PFI/PFO | Lacks triple-monitoring and power-fail warning; suited only for basic VCC-only supervision | Choose only if triple-voltage monitoring and PFO interrupt capability are not required - lower cost but functionally reduced |
Compared with MAX6702MSKA+, the MAX6702ASKA+ offers lower VCC threshold for +2.85V rails and identical triple-monitoring capability; versus TPS3808G33DBVR, it delivers full feature parity including dual adjustable inputs and PFI/PFO, making it irreplaceable in multi-rail designs requiring coordinated reset and early power-fail signaling.
Availability
MAX6702ASKA+ is available at Aetrix Electronics and suitable for industrial PLC controllers, telecom baseband units, white goods main control boards, and networking switch management cards requiring stable component supply across extended temperature ranges.
Supply support for MAX6702ASKA+ 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 targets space-constrained µP systems needing reliable, multi-rail power supervision with integrated watchdog and power-fail warning - optimized for SOT23 footprint and wide-temperature operation.
FAQ
What is the exact reset threshold voltage for MAX6702ASKA+ and how is it specified?
The MAX6702ASKA+ has a nominal VCC reset threshold of 2.85V, with guaranteed limits of 2.83V (min) to 3.02V (max) over the full −40°C to +125°C operating temperature range. This value is defined by the 'S' suffix in the part number and is factory-trimmed; it applies specifically to the VCC input, while RST_IN1 and RST_IN2 use the internal 0.62V reference with external dividers. The MAX6702ASKA+ datasheet confirms this in the Electrical Characteristics table under "VCC Reset Threshold" for MAX670_S/MAX670_AS variants.
Does MAX6702ASKA+ support monitoring of three independent supply voltages simultaneously?
Yes, the MAX6702ASKA+ supports triple-voltage monitoring: VCC (2.85V threshold), plus two user-adjustable supplies via RST_IN1 and RST_IN2 pins. Each of those inputs references the internal 0.62V comparator, so external resistor dividers set their respective trip points - e.g., a 5:1 divider on RST_IN1 yields a 3.1V threshold. The device asserts RESET if any one of the three monitored voltages falls below its threshold, and holds RESET for the full timeout period after all recover. This capability is explicitly documented in the MAX6702ASKA+ functional description and pin table.
What is the function of the WDO pin on MAX6702ASKA+ and how does it differ from standard MAX6702 versions?
The WDO (Watchdog Output) pin on MAX6702ASKA+ is an active-low, push-pull output that asserts when the watchdog timer overflows (after ~1.6s of WDI inactivity) OR when VCC, RST_IN1, or RST_IN2 drops below their thresholds. Crucially, in the A-version (denoted by 'A' in MAX6702A), WDO deasserts immediately upon recovery from undervoltage - unlike non-A versions which require a WDI edge. This behavior is confirmed in the "Standard- vs. A-Version Comparison" section of the MAX6702ASKA+ datasheet and enables faster fault recovery in time-critical systems.
Can MAX6702ASKA+ generate a power-fail interrupt signal, and how is it implemented?
Yes, the MAX6702ASKA+ provides dedicated power-fail warning via the PFI (input) and PFO (output) pins. PFI accepts an external voltage (e.g., from a resistor divider off a 5V rail); when that voltage falls below 0.62V (typ), PFO asserts low within 1µs. This active-low PFO signal can directly drive a µP interrupt pin (e.g., NMI) to initiate graceful shutdown. The 6mV hysteresis prevents chatter near the trip point. This function is fully supported in MAX6702ASKA+ and detailed in the "Power-Fail Comparator" section of its datasheet.
What package type and RoHS status does MAX6702ASKA+ use, and how is this indicated in the part number?
The MAX6702ASKA+ uses an 8-pin SOT23 package (outline 21-0078, land pattern 90-0176) and is RoHS-compliant and lead-free. The '+' character in the suffix 'KA+' explicitly denotes lead-free packaging per Maxim's ordering convention - replacing the legacy '-T' suffix. This is confirmed in the "Ordering Information" and "Package Information" sections of the MAX6702ASKA+ datasheet, and the device meets JEDEC J-STD-020 moisture sensitivity level 1.
MAX6702ASKA+ 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:
- 2.93V, 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
MAX6702ASKA+ FAQ
1.How can I place an order for MAX6702ASKA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6702ASKA+ 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 MAX6702ASKA+ reliable?
The price and inventory of MAX6702ASKA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6702ASKA+ is usually 5 days.
3.What payment methods are accepted for MAX6702ASKA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6702ASKA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6702ASKA+?
MAX6702ASKA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6702ASKA+ 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 MAX6702ASKA+?
For technical support, including MAX6702ASKA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6702ASKA+ requirements.
6.How does Aetrix verify that MAX6702ASKA+ is sourced from the original manufacturer or authorized distributors?
All MAX6702ASKA+ 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 MAX6702ASKA+ meets industry standards.
7.What is the process for return or replacement of MAX6702ASKA+?
All MAX6702ASKA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6702ASKA+, 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 MAX6702ASKA+ part is unused and in its original packaging.
Return procedure for MAX6702ASKA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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