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Analog Devices Inc./Maxim Integrated MAX6702SKA
- Part No.:
- MAX6702SKA
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-8
- Datasheet:
-
MAX6702SKA.pdf
- Description:
- MAX6702 LOW-VOLTAGE, MICROPROCES
- Quantity:
- Payment:
- Shipping:
Inventory:2,375
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Product details
Overview
MAX6702SKA from Maxim Integrated is an active-high push-pull microprocessor supervisory IC in 8-pin SOT23 package, monitoring +3.3V supply (3.08V reset threshold), providing 140ms reset timeout, independent watchdog output (WDO), and manual reset input (MR). It asserts RESET high during VCC brownout or power-down and supports power-fail warning via PFI/PFO comparator with 0.62V reference for early system shutdown in industrial controllers.
For engineers reviewing the MAX6702SKA datasheet, MAX6702SKA pinout, MAX6702SKA application, or MAX6702SKA equivalent, key selection criteria include active-high reset polarity, guaranteed operation down to VCC = 1V, immunity to short VCC transients, and compatibility with triple-voltage supervision when paired with external resistor dividers on RST_IN1/RST_IN2.
Technical Context
The MAX6702SKA implements a precision voltage-monitoring architecture with three internal comparators: one fixed-threshold monitor for VCC (3.08V), and two adjustable inputs (RST_IN1, RST_IN2) referenced to 0.62V, enabling triple-supply supervision. Its reset generator guarantees valid output down to VCC = 1V and includes 140ms timeout with hysteresis to prevent chatter during slow-rising/falling supplies.
The integrated watchdog timer monitors WDI transitions with 1.6s timeout (typ), asserting WDO low on overflow; WDO deasserts immediately upon valid WDI edge or MR pull-low in A-version. The PFI/PFO comparator operates independently, supporting early power-fail detection without affecting reset timing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 3.08V (VCC falling), ±3% tolerance over -40°C to +125°C - ensures reliable assertion before +3.3V rail collapse. |
| Reset Timeout Period | 140ms (typ), 120–300ms range - provides sufficient hold time for µP initialization after power stabilization. |
| Watchdog Timeout | 1.6s (typ), 0.96–2.52s range - balances fault detection latency against false triggers in noisy environments. |
| Supply Voltage Range | 1.2V to 5.5V - enables operation across brownout conditions while maintaining reset validity down to 1V. |
| PFI Threshold | 0.62V (typ), ±5mV hysteresis - allows precise external voltage-divider-based monitoring of secondary rails. |
| Output Type | Active-high push-pull RESET, open-drain WDO - eliminates need for external pull-up on RESET; supports NMI interrupt via WDO. |
| Quiescent Current | 9µA (typ) at VCC = 3.3V - minimizes standby power in battery-backed or energy-sensitive systems. |
Pinout & Package
MAX6702SKA uses an 8-pin SOT23-8 package (JEDEC MO-178 BA compliant), 2.80mm × 2.90mm footprint, 1.45mm height, with gull-wing leads and coplanarity ≤ 0.1mm. Pin 1 marked by dot; lead finish available in SnPb or lead-free (specify +T).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 MR | Active-low manual reset input | CMOS-compatible input with 50kΩ internal pullup; forces RESET high when pulled low; debounces pushbutton switches. |
| 2 VCC | Main supply input | Power source for internal circuitry and push-pull outputs; monitored for reset assertion; valid down to 1V. |
| 3 GND | Ground reference | Common return path for all analog and digital functions; must be low-impedance for accurate threshold sensing. |
| 4 PFI | Power-fail input | High-impedance comparator input referenced to 0.62V; accepts external divider for secondary rail monitoring. |
| 5 PFO | Power-fail output | Open-drain output asserted low when PFI < 0.62V; used to trigger µP interrupt prior to main supply failure. |
| 6 WDI | Watchdog input | Edge-sensitive input; toggling within 1.6s prevents WDO assertion; 50ns minimum pulse width detectable. |
| 7 RESET | Active-high reset output | Push-pull output driven high during reset condition; guaranteed VOH ≥ 0.8×VCC at ISOURCE = 500µA. |
| 8 WDO | Watchdog output | Open-drain output asserted low on watchdog timeout or undervoltage; deasserts on WDI edge or MR low (A-version). |
Key Features
| Feature | Design Value |
|---|---|
| Triple-voltage supervision capability | Supports monitoring of VCC + two additional rails (RST_IN1/RST_IN2) using external resistive dividers referenced to 0.62V. |
| Guaranteed reset validity to VCC = 1V | Ensures deterministic behavior during deep brownout; RESET remains high until VCC drops below 1V, then floats high-impedance. |
| Immunity to short VCC transients | Rejects glitches ≤ 100ns duration, preventing spurious resets in electrically noisy industrial environments. |
| Independent power-fail comparator | Uncommitted PFI/PFO pair enables flexible early-warning schemes without interfering with primary reset timing. |
| Manual reset with internal pullup | 50kΩ internal MR pullup eliminates external component; simplifies pushbutton interface and reduces BOM count. |
Applications
| Industrial PLC Controller | Automotive Body Control Module |
|---|---|
|
Use Scenario: Monitoring +3.3V I/O supply and +5V MCU core rail in programmable logic controller with watchdog-triggered safe state entry. IC Role / Device Role / Timing Role: MAX6702SKA provides active-high RESET to enable clean boot sequence and WDO-driven NMI for immediate firmware recovery on processor hang. Use Value: 140ms reset timeout ensures full µP initialization; PFI/PFO detects pre-failure on auxiliary 12V-to-5V converter, allowing graceful I/O shutdown before main rail collapse. |
Use Scenario: Supervising dual power domains (+3.3V infotainment SoC and +5V sensor interface) in vehicle body electronics with thermal derating. IC Role / Device Role / Timing Role: MAX6702SKA monitors VCC and RST_IN1 (via divider) to assert RESET high during cold-cranking voltage dip; WDO signals watchdog fault to CAN transceiver. Use Value: Operation down to VCC = 1V maintains supervision during engine start; 60ppm/°C threshold drift ensures stable trip point across -40°C to +125°C automotive temperature range. |
| Network Router Power Management | White Goods Main Control Board |
|
Use Scenario: Ensuring reliable reboot after PoE power interruption in enterprise Ethernet switch with multiple voltage rails. IC Role / Device Role / Timing Role: MAX6702SKA supervises primary +3.3V switcher output and secondary +1.8V PHY supply (via RST_IN2), asserting unified RESET high on any fault. Use Value: Dual adjustable inputs eliminate need for separate supervisors; 9µA quiescent current minimizes standby loss in always-on network infrastructure. |
Use Scenario: Monitoring +3.3V microcontroller supply and +5V motor driver rail in washing machine control board exposed to ESD and load dump. IC Role / Device Role / Timing Role: MAX6702SKA provides MR-driven reset for service mode entry and PFO-triggered emergency stop on AC line sag detection. Use Value: Open-drain WDO and PFO tolerate 6V transients per Absolute Maximum Ratings; MR glitch rejection (100ns) prevents false resets from relay coil kickback. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervision applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6702TKA | Same pinout and function, but 3.00V reset threshold (vs. 3.08V); tighter initial accuracy (±2.5% vs. ±3%). | Suitable where exact 3.00V trip is required for legacy +3.3V regulator tolerance stack-up. | Select MAX6702TKA if design uses older LDOs with wider output tolerance; otherwise MAX6702SKA matches modern +3.3V rails. |
| MAX6316US31D2+ | 3.08V threshold, SOT23-5 package, no PFI/PFO or WDI/WDO; only basic reset with 140ms timeout. | Lacks watchdog and power-fail features; intended for cost-sensitive single-rail applications. | Choose MAX6316US31D2+ only if watchdog and early-warning functions are unnecessary and PCB space is constrained. |
Compared with MAX6702TKA, MAX6702SKA offers marginally higher threshold for improved noise immunity on noisy +3.3V lines; compared with MAX6316US31D2+, it delivers full feature set (watchdog, PFI/PFO, triple-supply support) in same footprint with no layout change.
Availability
MAX6702SKA is available at Aetrix Electronics and suitable for industrial PLC controllers, automotive body control modules, and network router power management requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6702SKA 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, with emphasis on reliability, low power, and integration.
The MAX670x family targets microprocessor supervision in space-constrained, high-reliability systems, combining reset, watchdog, power-fail warning, and manual reset in a single SOT23-8 device to reduce component count and improve system robustness.
FAQ
What is the reset output polarity and drive type of the MAX6702SKA?
The MAX6702SKA features an active-high push-pull RESET output. When asserted (during power-up, brownout, or manual reset), RESET is driven high to a voltage ≥ 0.8×VCC with 500µA source capability. This eliminates the need for an external pull-up resistor and ensures fast, low-impedance signaling to the microprocessor's active-high reset input. The MAX6702SKA does not provide active-low or open-drain reset variants - those are implemented in other members of the MAX670x family like MAX6703SKA.
How does the MAX6702SKA handle power-fail detection, and what is the role of PFI and PFO?
The MAX6702SKA uses its PFI (Power-Fail Input) pin - internally referenced to a precise 0.62V comparator - to monitor secondary voltage rails via an external resistor divider. When the divided voltage falls below 0.62V, the PFO (Power-Fail Output) pin goes low (open-drain), signaling imminent supply failure. This allows the host µP to execute an orderly shutdown before the main VCC collapses. Unlike the reset function, PFI/PFO operates independently and does not affect RESET timing or assertion, making it ideal for predictive power management in MAX6702SKA-based systems.
Can the MAX6702SKA supervise more than one supply voltage, and how is that configured?
Yes, the MAX6702SKA can supervise up to three supply voltages: VCC (fixed 3.08V threshold), plus two additional rails via RST_IN1 and RST_IN2 pins. Each of these inputs connects to the same 0.62V internal reference, so external resistor dividers set their individual trip points (e.g., 5.0V rail → 10:1 divider yields 0.62V at 6.2V). Reset is asserted if *any* of the three monitored supplies falls below its threshold, and remains asserted for the full 140ms timeout after all supplies recover - a critical capability for multi-rail systems using MAX6702SKA.
What is the watchdog behavior of the MAX6702SKA, and how does it differ from non-A versions?
The MAX6702SKA is an "A-version" device: its WDO (Watchdog Output) deasserts immediately when VCC, RST_IN1, or RST_IN2 rises above threshold - no timeout delay. In contrast, non-A versions latch WDO low until a valid WDI edge occurs. Additionally, pulling MR low deasserts WDO in the MAX6702SKA, enabling software-controlled watchdog clearing. This makes the MAX6702SKA more responsive in recovery scenarios and avoids the locked condition possible with non-A parts when WDO is fed back to MR.
Is the MAX6702SKA suitable for operation at very low VCC levels, and what happens below 1V?
Yes, the MAX6702SKA guarantees valid RESET output down to VCC = 1V - meaning RESET remains a well-defined logic high (≥ 0.8×VCC) until VCC drops below that level. Below 1V, the RESET output enters high-impedance (Hi-Z) state and no longer actively drives. To maintain a defined low state in such deep brownout conditions, a 100kΩ external pull-down resistor on the RESET line is recommended - a standard practice documented in Maxim's application notes for MAX6702SKA and confirmed in the device's absolute maximum ratings and operating characteristics.
MAX6702SKA 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:
- 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
MAX6702SKA FAQ
1.How can I place an order for MAX6702SKA through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6702SKA 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 MAX6702SKA reliable?
The price and inventory of MAX6702SKA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6702SKA is usually 5 days.
3.What payment methods are accepted for MAX6702SKA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6702SKA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6702SKA?
MAX6702SKA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6702SKA 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 MAX6702SKA?
For technical support, including MAX6702SKA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6702SKA requirements.
6.How does Aetrix verify that MAX6702SKA is sourced from the original manufacturer or authorized distributors?
All MAX6702SKA 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 MAX6702SKA meets industry standards.
7.What is the process for return or replacement of MAX6702SKA?
All MAX6702SKA units undergo pre-shipment inspection (PSI). If there is an issue with MAX6702SKA, 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 MAX6702SKA part is unused and in its original packaging.
Return procedure for MAX6702SKA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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