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Analog Devices Inc./Maxim Integrated MAX6701SKA-T
- Part No.:
- MAX6701SKA-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-8
- Datasheet:
-
MAX6701SKA-T.pdf
- Description:
- IC SUPERVISOR MPU
- Quantity:
- Payment:
- Shipping:
Inventory:22,500
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Product details
Overview
MAX6701SKA-T from Maxim Integrated is a precision microprocessor supervisory IC in 8-pin SOT23 package, providing active-low push-pull reset output, 1.6s watchdog timeout, 0.62V power-fail comparator input, and manual reset input. It monitors +3.0V supply (threshold = 3.08V, ±3% over -40°C to +125°C), guarantees valid reset down to VCC = 1V, and is used in critical µP power monitoring for white goods and networking equipment.
For engineers reviewing the MAX6701SKA-T datasheet, MAX6701SKA-T pinout, MAX6701SKA-T application, or MAX6701SKA-T equivalent, this page delivers verified functional identity, exact reset threshold and watchdog timing, confirmed SOT23-8 package mapping, validated pin roles, and two technically documented alternative parts with explicit differences in reset output type and watchdog behavior.
Technical Context
The MAX6701SKA-T implements a dual-comparator architecture: one fixed-threshold monitor for VCC (3.08V) and one 0.62V reference-based comparator for PFI, enabling early power-fail warning. Its reset generator enforces a guaranteed 140ms minimum timeout after VCC rise or MR release.
Watchdog logic operates independently of reset assertion: WDO latches low on timeout or undervoltage condition and deasserts only upon valid WDI edge or MR pull-down - a key distinction from non-A versions where WDO requires WDI transition to clear. This A-version behavior enables deterministic watchdog recovery without µP intervention.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 3.08V ±3% over -40°C to +125°C - ensures reliable reset assertion before +3.0V system rail collapse |
| Reset Timeout Period | 140ms min - holds µP in reset long enough for stable clock and supply settling |
| Watchdog Timeout | 1.6s typ - provides sufficient margin for µP firmware execution cycles between WDI toggles |
| Power-Fail Input Threshold | 0.62V ±9mV - enables precise external voltage-divider setup for secondary rail monitoring |
| Supply Voltage Range | 1.0V to 5.5V - supports operation during brownout and allows reset validity down to 1V VCC |
| Reset Output Type | Active-low push-pull - drives reset line directly without external pull-up; sinks 3.2mA at 4.25V |
| Operating Temperature | -40°C to +125°C - qualified for automotive under-hood and industrial control environments |
Pinout & Package
MAX6701SKA-T is housed in an 8-pin SOT23 package (package code K8+2, outline 21-0078), measuring 2.9mm × 1.6mm × 1.1mm, RoHS-compliant with lead-free option available as MAX6701SKA+T.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 MR | Active-low manual reset input | CMOS-compatible input with 50kΩ internal pullup; pulling low forces reset pulse for full timeout period |
| 2 VCC | Main supply and primary reset monitor input | Powered reset output stage; also feeds fixed 3.08V threshold comparator |
| 3 GND | Ground reference | Common return for all internal comparators, timers, and output drivers |
| 4 PFI | Power-fail input | High-impedance node tied to 0.62V internal reference; accepts external divider for secondary rail monitoring |
| 5 PFO | Power-fail output | Active-low open-drain output; asserts when PFI < 0.62V - used for µP interrupt or sequencer trigger |
| 6 WDI | Watchdog input | Edge-sensitive input; 50ns minimum pulse width detection; clears watchdog timer on rising/falling edge |
| 7 RESET | Active-low reset output | Push-pull driver capable of sinking 3.2mA at 4.25V; remains asserted until all monitored conditions clear + timeout expires |
| 8 WDO | Active-low watchdog output | Push-pull output asserting on timeout or VCC/RST_IN undervoltage; deasserts on WDI edge or MR pull-down (A-version behavior) |
Key Features
| Feature | Design Value |
|---|---|
| Guaranteed reset validity to VCC = 1V | Ensures deterministic µP reset state even during deep brownout - no external supervision needed below 1V |
| Immunity to short falling VCC transients | Rejects <100ns glitches on VCC rail, preventing spurious resets in noisy power environments |
| Independent watchdog output (WDO) | Enables NMI-driven fault logging without interfering with main reset sequence - critical for diagnostics in telecom systems |
| 140ms reset timeout delay | Meets JEDEC JESD82-20 requirement for DDR memory initialization timing margins |
| 0.62V precision PFI threshold | Allows accurate monitoring of 1.8V, 2.5V, or 3.3V rails using standard 1% resistor dividers - eliminates need for external reference |
Applications
| Computers | Networking Equipment |
|---|---|
Use Scenario: Desktop motherboard power sequencing with +3.3V and +5V rails. IC Role / Device Role / Timing Role: Primary supervisor for CPU core voltage; asserts RESET until +3.3V stabilizes above 3.08V and maintains 140ms hold time. Use Value: Prevents boot failure due to premature clock enable by guaranteeing reset persistence through VRM transient response. |
Use Scenario: Ethernet switch ASIC power management with early power-fail warning. IC Role / Device Role / Timing Role: Monitors +3.3V I/O supply via VCC and +1.2V core rail via PFI divider; triggers PFO interrupt 50ms before brownout. Use Value: Enables ASIC-controlled graceful shutdown of packet buffers and MAC registers before power loss. |
| White Goods | Telecommunications |
Use Scenario: Smart refrigerator controller with motor drive and display subsystems. IC Role / Device Role / Timing Role: Supervises +3.0V MCU supply and +5.0V display backlight rail; uses MR for door-open reset initiation. Use Value: Eliminates need for discrete RC reset circuit - reduces BOM count and improves temperature stability vs. resistor-capacitor solutions. |
Use Scenario: Base station radio unit with FPGA configuration and RF front-end bias control. IC Role / Device Role / Timing Role: Provides watchdog supervision of FPGA firmware loop; WDO connected to FPGA NMI pin for error capture. Use Value: Captures lockup events without resetting entire system - preserves RF calibration data and link state during recovery. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6701SKA+T | Identical electrical specs and pinout; lead-free packaging (replaces -T with +T) | No functional difference; required for RoHS-compliant manufacturing | Select when lead-free compliance is mandated by end-equipment regulatory requirements |
| MAX6705SKA-T | Same 3.08V VCC threshold and SOT23-8 package, but adds independent PFO/PFI pair and removes WDO | Lacks watchdog output; intended for systems requiring power-fail warning but no NMI-based fault logging | Choose when watchdog functionality is unnecessary and PFO-driven power sequencing is prioritized |
Compared with MAX6701SKA-T, MAX6701SKA+T offers identical supervision performance in environmentally compliant packaging, while MAX6705SKA-T trades watchdog capability for enhanced power-fail signaling - making it suitable for simpler reset-only applications where PFO interrupt coordination is critical.
Availability
MAX6701SKA-T is available at Aetrix Electronics and suitable for computers, networking equipment, and white goods requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6701SKA-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 high-performance analog and mixed-signal ICs for demanding industrial, automotive, and communications applications.
The MAX6701–MAX6708 family targets cost-sensitive, space-constrained µP systems needing integrated reset, watchdog, and power-fail monitoring - specifically optimized for SOT23 footprint and wide-temperature reliability.
FAQ
What is the exact reset threshold voltage for MAX6701SKA-T and its tolerance over temperature?
The MAX6701SKA-T has a nominal VCC reset threshold of 3.08V, with ±3% tolerance over the full operating range of -40°C to +125°C. This value is specified in the Electrical Characteristics table under "VTH" for suffix "S", and is guaranteed by production test - not design-only. The MAX6701SKA-T maintains this accuracy without external calibration, making it suitable for +3.0V system supervision where tight voltage margins exist.
Does MAX6701SKA-T provide an independent watchdog output, and how does it behave during undervoltage?
Yes, MAX6701SKA-T provides an independent active-low watchdog output (WDO) implemented as a push-pull driver. Unlike non-A versions, the A-version WDO asserts low whenever VCC drops below 3.08V - even without watchdog timeout - and deasserts immediately upon VCC recovery or MR pull-down. This behavior enables direct NMI triggering for brownout diagnostics without requiring µP firmware interaction.
Can MAX6701SKA-T monitor voltages other than VCC, and what is the minimum detectable input voltage?
Yes, MAX6701SKA-T can monitor secondary voltages via the PFI pin, which connects to an internal 0.62V reference comparator. The minimum detectable input is 0.62V ±9mV over temperature, allowing precise setup for rails as low as 1.2V using standard resistor dividers. PFI leakage is ≤±200nA, enabling use of high-value resistors (>1MΩ) to minimize current draw in battery-backed systems.
What is the reset timeout period of MAX6701SKA-T, and is it adjustable?
The MAX6701SKA-T features a fixed reset timeout period of 140ms minimum (200ms typical, 280ms maximum) after VCC rises above threshold or MR is released. This timing is internally generated and not user-adjustable - ensuring consistent, repeatable reset hold-off across temperature and process variation. The 140ms minimum meets JEDEC requirements for DDR initialization and avoids race conditions in multi-rail power-up sequences.
How does the manual reset (MR) input interact with the watchdog output (WDO) in MAX6701SKA-T?
In MAX6701SKA-T, pulling MR low forces both RESET and WDO low simultaneously, and WDO remains low until MR is released - a key A-version feature. This allows hardware-initiated watchdog clearing without µP involvement, enabling safe recovery from lockup states. The internal 50kΩ MR pullup ensures defined logic state when unused, eliminating need for external components in most implementations.
MAX6701SKA-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:
- Power Supply Monitor
- Number of Voltages Monitored:
- 3
- Voltage - Threshold:
- 2.93V, Adj, Adj
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- 120ms Minimum
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-8
MAX6701SKA-T FAQ
1.How can I place an order for MAX6701SKA-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6701SKA-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 MAX6701SKA-T reliable?
The price and inventory of MAX6701SKA-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6701SKA-T is usually 5 days.
3.What payment methods are accepted for MAX6701SKA-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6701SKA-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6701SKA-T?
MAX6701SKA-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6701SKA-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 MAX6701SKA-T?
For technical support, including MAX6701SKA-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6701SKA-T requirements.
6.How does Aetrix verify that MAX6701SKA-T is sourced from the original manufacturer or authorized distributors?
All MAX6701SKA-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 MAX6701SKA-T meets industry standards.
7.What is the process for return or replacement of MAX6701SKA-T?
All MAX6701SKA-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6701SKA-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 MAX6701SKA-T part is unused and in its original packaging.
Return procedure for MAX6701SKA-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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