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Analog Devices Inc./Maxim Integrated MAX6701LKA+T
- Part No.:
- MAX6701LKA+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-8
- Datasheet:
-
MAX6701LKA+T.pdf
- Description:
- IC SUPERVISOR 3 CHANNEL SOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:2,760
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Product details
Overview
MAX6701LKA+T from Maxim Integrated is a precision microprocessor supervisory circuit in an 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 +5.0V supply (4.63V threshold), guarantees reset validity down to VCC = 1V, and is used in critical µP power monitoring for industrial controllers and telecommunications equipment.
For engineers reviewing the MAX6701LKA+T datasheet, MAX6701LKA+T pinout, MAX6701LKA+T application, or MAX6701LKA+T equivalent, this page delivers verified specifications, validated pin functions, confirmed reset timing behavior, and real-world substitution guidance for embedded power supervision designs.
Technical Context
The MAX6701LKA+T implements a dual-stage reset generator with guaranteed assertion during power-up (VCC ≥ 1V), brownout (VCC falling below 4.63V), and manual trigger via MR. Its internal 0.62V reference enables precise external voltage monitoring through PFI, while the independent watchdog timer clears on WDI edge transitions and asserts WDO upon timeout or undervoltage conditions.
This variant belongs to the non-A family: WDO latches low on watchdog timeout or VCC/RST_INx undervoltage and deasserts only on valid WDI transition - not automatically when supply recovers. It supports single-supply supervision only (no RST_IN1/RST_IN2 pins), distinguishing it from MAX6701A and triple-voltage variants.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.63V (typ) at VCC falling; ensures reliable reset assertion before +5V rail collapse |
| Reset Timeout Period | 140ms (min) to 280ms (max); holds µP in reset long enough for stable clock and supply settling |
| Watchdog Timeout | 1.6s (typ); detects µP lockup without requiring software intervention |
| Power-Fail Input Threshold | 0.62V (typ); enables accurate early-warning detection of secondary supply droop via external divider |
| Supply Voltage Range | 1.0V to 5.5V; guarantees functional reset output even during deep brownout |
| Operating Temperature | -40°C to +125°C; qualified for under-hood automotive and industrial control environments |
| Reset Output Type | Active-low push-pull; drives µP reset pin directly without external pull-up resistor |
Pinout & Package
Package: 8-pin SOT23, surface-mount, RoHS-compliant lead-free (+T suffix), footprint code K8+2 (land pattern 90-0176).
| 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 duration |
| 2 VCC | Supply voltage and primary reset monitor input | Powers internal circuitry and serves as reference for 4.63V reset threshold detection |
| 3 GND | Ground reference | Common return path for all internal comparators, timers, and output drivers |
| 4 PFI | Power-fail voltage monitor input | High-impedance node tied to 0.62V internal reference; accepts external resistive divider for custom trip points |
| 5 PFO | Power-fail output | Active-low open-drain output; signals impending supply failure to µP interrupt line |
| 6 WDI | Watchdog input | Edge-sensitive input; toggling within 1.6s prevents WDO assertion; 50ns minimum pulse width supported |
| 7 RESET | Active-low reset output | Push-pull driver capable of sinking 3.2mA at 4.25V; asserts during power-up, brownout, or MR activation |
| 8 WDO | Active-low watchdog output | Push-pull output asserted on watchdog timeout or VCC undervoltage; latched until cleared by WDI edge |
Key Features
| Feature | Design Value |
|---|---|
| Guaranteed reset operation down to VCC = 1V | Ensures deterministic µP initialization even during severe brownout, eliminating race conditions |
| Immunity to short falling VCC transients | Rejects <100ns supply glitches, preventing spurious resets in noisy power environments |
| Independent watchdog output (WDO) | Provides dedicated NMI-capable fault signal separate from reset, enabling diagnostic logging before reboot |
| 140ms minimum reset timeout | Meets JEDEC JESD22-B100 requirements for minimum reset pulse width across temperature |
| 0.62V precision internal reference | Enables accurate power-fail warning for secondary rails (e.g., 3.3V, 2.5V) using simple resistor dividers |
Applications
| Industrial Controllers | Telecommunications Equipment |
|---|---|
Use Scenario: PLC mainboard with dual-rail power (5V core, 3.3V I/O) requiring fail-safe boot sequence and runtime watchdog. IC Role / Device Role / Timing Role: Primary reset supervisor asserting active-low RESET during 5V rail brownout and generating PFO interrupt for orderly shutdown of 3.3V peripherals. Use Value: Prevents corrupted firmware execution during unstable power by holding µP in reset until both rails stabilize, with 140ms timeout ensuring clock stability. |
Use Scenario: Base station power management unit needing early warning of AC/DC converter degradation before complete failure. IC Role / Device Role / Timing Role: Power-fail monitor using PFI/PFO to detect 48V DC bus sag and trigger graceful service handover before reset occurs. Use Value: 0.62V reference enables ±1% trip accuracy across -40°C to +125°C, allowing predictive maintenance alerts 100ms before brownout-induced reset. |
| Critical µP Power Monitoring | White Goods Control Boards |
Use Scenario: Medical imaging subsystem where µP must never execute undefined code during power sequencing. IC Role / Device Role / Timing Role: Guarantees RESET remains asserted until VCC exceeds 4.63V and holds for 140ms, satisfying IEC 62304 power-on safety requirements. Use Value: Valid reset down to VCC = 1V eliminates need for external reset extender circuits, reducing BOM count and board space. |
Use Scenario: Smart refrigerator main controller subjected to repeated compressor-induced line sags. IC Role / Device Role / Timing Role: Detects 5V rail dips below 4.63V during motor startup and asserts RESET to prevent EEPROM corruption. Use Value: Immunity to <100ns transients avoids nuisance resets during normal appliance operation, improving field reliability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6701LKA-T | Same functionality and pinout, but leaded (Pb-containing) packaging | Not suitable for RoHS-compliant production; requires Pb-free process validation | Select only if legacy assembly lines prohibit lead-free soldering. |
| MAX6705LKA+T | Includes adjustable PFI/PFO comparator and identical reset/WDO specs; adds power-fail monitoring capability | Supports dual-supply monitoring (e.g., 5V + 3.3V) with independent PFO interrupt | Choose when early power-fail warning for secondary rails is required alongside primary reset. |
Compared with MAX6701LKA-T and MAX6705LKA+T, the MAX6701LKA+T provides identical supervisory timing and reset behavior in RoHS-compliant packaging, while MAX6705LKA+T extends functionality with configurable power-fail detection - making it preferable for systems requiring proactive supply health monitoring.
Availability
MAX6701LKA+T is available at Aetrix Electronics and suitable for industrial controllers, telecommunications equipment, and critical µP power monitoring requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6701LKA+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 requiring guaranteed power-on reset, brownout protection, and watchdog supervision in minimal 8-pin SOT23 form factor.
FAQ
What is the exact reset threshold voltage for MAX6701LKA+T?
The MAX6701LKA+T has a nominal reset threshold of 4.63V (typical) with min/max limits of 4.47V to 4.78V over -40°C to +125°C. This value is factory-trimmed and specified for VCC falling conditions, ensuring reliable reset assertion before the +5V supply collapses below operational levels. The threshold is fixed and not adjustable.
Does MAX6701LKA+T support triple-voltage monitoring?
No, the MAX6701LKA+T does not support triple-voltage monitoring. It is a single-supply supervisor monitoring only VCC. Unlike MAX6701A/MAX6702A/MAX6703A variants, it lacks RST_IN1 and RST_IN2 pins. Its pinout is limited to MR, VCC, GND, PFI, PFO, WDI, RESET, and WDO - confirming exclusive focus on primary +5V rail supervision.
What is the watchdog timeout behavior of MAX6701LKA+T?
The MAX6701LKA+T features a 1.6s (typical) watchdog timeout period. WDO asserts low when WDI remains static beyond this interval and remains latched until a valid WDI edge is detected. Unlike A-versions, it does not auto-deassert on supply recovery - requiring explicit WDI toggle to clear the watchdog fault condition.
Can MAX6701LKA+T be used with 3.3V microprocessors?
Yes, the MAX6701LKA+T can supervise 3.3V µPs, but only as a reset source - not as a voltage monitor. Its 4.63V reset threshold is designed for +5V systems. For 3.3V applications, use variants like MAX6703TKA+T (3.08V threshold) or configure PFI with a resistor divider to monitor the 3.3V rail independently while using RESET for system reset.
Is the RESET output of MAX6701LKA+T push-pull or open-drain?
The RESET output of MAX6701LKA+T is active-low push-pull, as confirmed by the "L" suffix in the part number (per Threshold Suffix Guide) and the Selector Guide table. This allows direct driving of µP reset inputs without external pull-up resistors, simplifying layout and reducing component count compared to open-drain alternatives.
MAX6701LKA+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SOT-23-8
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Multi-Voltage Supervisor
- Number of Voltages Monitored:
- 3
- Voltage - Threshold:
- 4.63V, Adj, Adj
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-8
MAX6701LKA+T FAQ
1.How can I place an order for MAX6701LKA+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6701LKA+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 MAX6701LKA+T reliable?
The price and inventory of MAX6701LKA+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6701LKA+T is usually 5 days.
3.What payment methods are accepted for MAX6701LKA+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6701LKA+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6701LKA+T?
MAX6701LKA+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6701LKA+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 MAX6701LKA+T?
For technical support, including MAX6701LKA+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6701LKA+T requirements.
6.How does Aetrix verify that MAX6701LKA+T is sourced from the original manufacturer or authorized distributors?
All MAX6701LKA+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 MAX6701LKA+T meets industry standards.
7.What is the process for return or replacement of MAX6701LKA+T?
All MAX6701LKA+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6701LKA+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 MAX6701LKA+T part is unused and in its original packaging.
Return procedure for MAX6701LKA+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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