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Analog Devices Inc./Maxim Integrated MAX6702SKA-T
- Part No.:
- MAX6702SKA-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-8
- Datasheet:
-
MAX6702SKA-T.pdf
- Description:
- IC SUPERVISOR 3 CHANNEL SOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:7,500
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Product details
Overview
MAX6702SKA-T from Maxim Integrated is an active-high push-pull microprocessor supervisory IC that monitors +3.0V supply voltage (3.08V threshold), provides 140ms reset timeout, independent watchdog output with 1.6s timeout, and power-fail warning via 0.62V comparator input. It ensures reliable µP startup and brownout recovery in white goods and telecom power management systems.
For engineers reviewing the MAX6702SKA-T datasheet, MAX6702SKA-T pinout, MAX6702SKA-T application, or MAX6702SKA-T equivalent, key selection criteria include its active-high reset output, triple-voltage supervision capability (VCC + RST_IN1 + RST_IN2), guaranteed reset validity down to VCC = 1V, immunity to short VCC transients, and SOT23-8 package compatibility with space-constrained embedded designs.
Technical Context
The MAX6702SKA-T implements a dual-comparator architecture: one fixed-threshold monitor for VCC (3.08V) and two high-impedance adjustable inputs (RST_IN1/RST_IN2) referenced to 0.62V, enabling triple-supply supervision. Its reset generator holds RESET high for 140–300ms after all monitored voltages exceed thresholds.
It integrates a watchdog timer that asserts WDO low if WDI remains static beyond 1.6s (typ), with WDO deasserting on valid WDI edge or MR low assertion - a behavior distinguishing the "A" version from standard variants. The PFI/PFO comparator operates independently with <1µs propagation delay and 6mV hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 3.08V (typ) at VCC; ±3% tolerance over -40°C to +125°C ensures stable trip point across industrial temperature range |
| Reset Timeout Period | 140ms (min) to 300ms (max); guarantees µP reset pulse long enough to complete internal initialization |
| Watchdog Timeout | 1.6s (typ); provides sufficient margin for µP firmware execution cycles before fault detection |
| Power-Fail Input Threshold | 0.62V (typ); enables precise early-warning detection of secondary supply collapse using external resistor divider |
| Supply Voltage Range | 1.2V to 5.5V; supports operation during brownout and allows use with low-voltage µPs and regulators |
| Quiescent Current | 9µA (typ) at VCC < 3.6V; minimizes standby power in battery-backed or energy-sensitive systems |
| Reset Output Type | Active-high push-pull; eliminates need for external pull-up resistor and drives CMOS/TTL loads directly |
Pinout & Package
MAX6702SKA-T is housed in an 8-pin SOT23 package (JEDEC MO-178AA), measuring 2.9mm × 1.6mm × 1.1mm, with gull-wing leads and RoHS-compliant lead-free finish (denoted by "+T" ordering 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 | Primary supply voltage input | Monitored at 3.08V threshold; powers internal circuitry and RESET output stage; valid down to 1.2V |
| 3 GND | Ground reference | Common return path for all internal comparators, timers, and output drivers; requires low-impedance PCB connection |
| 4 PFI | Power-fail comparator input | High-impedance (±200nA leakage) node referenced to 0.62V internal bandgap; accepts external voltage divider for secondary supply monitoring |
| 5 PFO | Power-fail comparator output | Active-low push-pull output; asserts when PFI < 0.62V; used to trigger µP interrupt or initiate controlled shutdown |
| 6 WDI | Watchdog timer input | Edge-sensitive input; rising or falling transition resets 1.6s watchdog timer; pulses as short as 50ns are recognized |
| 7 RESET | Active-high reset output | Push-pull driver capable of sourcing 500µA at VCC ≥ 2.7V; guarantees logic-high state down to VCC = 1V |
| 8 WDO | Watchdog output | Active-low push-pull output; asserted on watchdog timeout or undervoltage condition; deasserts on WDI edge or MR low |
Key Features
| Feature | Design Value |
|---|---|
| Triple-supply supervision | Simultaneously monitors VCC (3.08V), RST_IN1, and RST_IN2 via 0.62V reference - enables full-system voltage integrity checking |
| Guaranteed reset validity to 1V | RESET remains functional and well-defined even as VCC collapses to 1.2V, preventing metastability during power-down |
| Immunity to short VCC transients | Rejects glitches ≤10µs duration (at ≥20mV overdrive), eliminating false resets from switching noise or load dumps |
| Independent power-fail comparator | PFI/PFO pair operates without affecting reset or watchdog timing - allows asynchronous early-warning signaling |
| Manual reset debouncing | MR input triggers full reset timeout period regardless of switch bounce duration, removing need for external RC filter |
Applications
| White Goods Control Panel | Telecom Line Card Power Management |
|---|---|
Use Scenario: Microcontroller in washing machine control board must restart reliably after AC line sags or DC rail dips during motor commutation. IC Role / Device Role / Timing Role: MAX6702SKA-T monitors main 3.3V rail and auxiliary 5V/12V rails via RST_IN1/RST_IN2, asserting active-high RESET until all supplies stabilize. Use Value: Prevents corrupted EEPROM writes and erratic motor sequencing by enforcing minimum 140ms reset hold time after brownout recovery. |
Use Scenario: Line card in carrier-grade DSLAM requires fail-safe reboot when primary DC-DC converter output drops below specification. IC Role / Device Role / Timing Role: MAX6702SKA-T's PFI pin monitors -48V-derived 3.3V supply; PFO triggers NMI interrupt while RESET initiates controlled firmware reload. Use Value: Enables graceful service handover and alarm reporting before full system reset, minimizing network downtime. |
| Industrial PLC I/O Module | Networking Switch Management Controller |
Use Scenario: Programmable logic controller module experiences transient ESD events on field I/O lines, causing localized supply droop. IC Role / Device Role / Timing Role: MAX6702SKA-T's immunity to sub-10µs VCC transients prevents spurious resets, while watchdog monitors firmware liveliness via WDI polling. Use Value: Maintains deterministic real-time response without unintended reboots during harsh electromagnetic environments. |
Use Scenario: Management ASIC in 10G Ethernet switch must recover from firmware hang without requiring physical intervention. IC Role / Device Role / Timing Role: MAX6702SKA-T watches WDI signal from ASIC; 1.6s timeout triggers WDO → MR loopback to force hardware reset pulse. Use Value: Achieves autonomous recovery within 200ms total (reset timeout + watchdog period), meeting carrier-grade availability SLAs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6702MKA-T | Fixed 4.38V reset threshold; same pinout, timing, and feature set | Designed for +5V systems instead of +3.3V/+3.0V rails | Select when supervising 5V logic supplies; no change to PCB layout or firmware interface |
| MAX6706SKA-T | Identical 3.08V threshold and SOT23-8 package, but active-high push-pull RESET with integrated power-fail comparator only (no RST_IN1/RST_IN2) | Lacks triple-supply monitoring capability; simplified dual-voltage supervision | Choose for cost-sensitive designs where only VCC + one auxiliary rail require monitoring |
Compared with MAX6702SKA-T, MAX6702MKA-T shifts reset threshold upward for 5V systems but retains identical supervision logic and watchdog behavior, while MAX6706SKA-T reduces pin count and complexity by omitting adjustable reset inputs - making it suitable for single-rail or dual-rail applications where triple-voltage coverage is unnecessary.
Availability
MAX6702SKA-T is available at Aetrix Electronics and suitable for white goods control panels, telecom line cards, industrial PLC modules, networking switch controllers, and intelligent instrumentation requiring stable component supply across extended temperature ranges.
Supply support for MAX6702SKA-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 industrial, communications, and computing applications, with expertise in power management and reliability-critical supervision functions.
The MAX6701–MAX6708 family was engineered specifically for robust microprocessor supervision in harsh environments - delivering guaranteed reset timing, multi-rail monitoring, and watchdog safety features in minimal SOT23 footprint.
FAQ
What is the exact reset threshold voltage of the MAX6702SKA-T?
The MAX6702SKA-T has a nominal VCC reset threshold of 3.08V, with guaranteed limits of 3.00V (min) and 3.15V (max) over -40°C to +85°C, and 2.97V (min) to 3.17V (max) over -40°C to +125°C. This threshold is factory-trimmed and applies specifically to the "S" suffix variant, confirmed in the Electrical Characteristics table of the official MAX6701–MAX6708 datasheet.
Does the MAX6702SKA-T support monitoring of multiple supply rails?
Yes, the MAX6702SKA-T supports triple-supply supervision: its primary VCC input (3.08V threshold), plus two user-adjustable inputs - RST_IN1 and RST_IN2 - each referenced to an internal 0.62V comparator. These allow independent monitoring of secondary rails like 1.8V or 2.5V using external resistor dividers, with reset asserted if any rail falls below its configured threshold.
How does the watchdog function behave on the MAX6702SKA-T?
The MAX6702SKA-T watchdog timer has a 1.6s typical timeout period. It asserts WDO low if WDI remains static beyond this interval. Unlike non-A versions, the "A" variant deasserts WDO immediately upon valid WDI edge or MR low - not requiring a timeout delay for recovery. This behavior is explicitly documented in the Standard- vs. A-Version Comparison section of the datasheet.
What is the purpose of the PFI and PFO pins on the MAX6702SKA-T?
PFI is a high-impedance input referenced to an internal 0.62V bandgap voltage; connecting it to a resistor divider from a secondary supply enables early power-fail detection. PFO is its complementary active-low push-pull output, asserting when PFI voltage drops below 0.62V. This pair operates independently of reset timing and can trigger µP interrupts for orderly shutdown before VCC collapse.
Is the MAX6702SKA-T compatible with 1.8V or 2.5V logic interfaces?
Yes - the MAX6702SKA-T's MR, WDI, and PFI inputs accept logic levels defined as VIL = 0.3×VCC and VIH = 0.7×VCC, and its RESET/WDO/PFO outputs drive to 0.8×VCC when sourcing current. With VCC ≥ 2.55V, it fully supports 1.8V and 2.5V logic families. Its 1.2V minimum operating voltage also permits operation during deep brownout conditions.
MAX6702SKA-T 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:
- 2.93V, Adj, Adj
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active High
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-8
MAX6702SKA-T FAQ
1.How can I place an order for MAX6702SKA-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6702SKA-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 MAX6702SKA-T reliable?
The price and inventory of MAX6702SKA-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6702SKA-T is usually 5 days.
3.What payment methods are accepted for MAX6702SKA-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6702SKA-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6702SKA-T?
MAX6702SKA-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6702SKA-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 MAX6702SKA-T?
For technical support, including MAX6702SKA-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6702SKA-T requirements.
6.How does Aetrix verify that MAX6702SKA-T is sourced from the original manufacturer or authorized distributors?
All MAX6702SKA-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 MAX6702SKA-T meets industry standards.
7.What is the process for return or replacement of MAX6702SKA-T?
All MAX6702SKA-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6702SKA-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 MAX6702SKA-T part is unused and in its original packaging.
Return procedure for MAX6702SKA-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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