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Analog Devices Inc./Maxim Integrated MAX6701TKA
- Part No.:
- MAX6701TKA
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-8
- Datasheet:
-
MAX6701TKA.pdf
- Description:
- IC SUPERVISOR MPU
- Quantity:
- Payment:
- Shipping:
Inventory:799
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Product details
Overview
MAX6701TKA from Maxim Integrated is a low-voltage microprocessor supervisory circuit in an 8-pin SOT23 package, providing active-low push-pull reset output, 140ms reset timeout, 1.6s watchdog timer, and 0.62V power-fail detection. It monitors +5.0V/+3.3V/+3.0V/+2.5V supplies and guarantees valid reset down to VCC = 1V for reliable µP startup and brownout recovery in automotive and industrial control systems.
For engineers reviewing the MAX6701TKA datasheet, MAX6701TKA pinout, MAX6701TKA application, or MAX6701TKA equivalent, this device delivers precision supply monitoring with manual reset input, independent watchdog output, and dual adjustable reset inputs for triple-voltage supervision - critical for safety-critical embedded power sequencing and fault recovery design.
Technical Context
The MAX6701TKA implements a dedicated reset generator with voltage threshold detection on VCC and two user-adjustable inputs (RST_IN1/RST_IN2), each referenced to a 0.62V internal comparator. Its watchdog circuit asserts WDO low after 1.6s of no WDI edge transition, and deasserts only upon valid WDI toggle or MR assertion.
Reset assertion occurs on VCC fall below threshold, MR low, or watchdog timeout; RESET remains low for ≥140ms after all reset conditions clear. The device supports operation from 1.2V to 5.5V and maintains guaranteed reset validity down to VCC = 1V, with immunity to short falling-VCC transients.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Output Type | Active-low push-pull - drives logic-low reset signal directly without external pull-up; sinks up to 3.2mA at VCC ≥ 4.25V. |
| Reset Timeout Period | 140ms minimum - ensures µP remains held in reset long enough for stable clock and supply settling after power-up or brownout. |
| Watchdog Timeout | 1.6s typical - provides fail-safe recovery window for firmware hang detection in real-time embedded applications. |
| VCC Reset Threshold | 4.63V (L-suffix) - precise trip point for +5V system monitoring; ±3% tolerance over -40°C to +125°C. |
| Power-Fail Input Threshold | 0.62V (typ) - enables early warning of supply collapse via external resistor divider on PFI pin. |
| Supply Voltage Range | 1.2V to 5.5V - supports operation during deep brownout and ensures functional reset assertion even as VCC decays to 1V. |
| Operating Temperature | -40°C to +125°C - qualified for under-hood automotive and industrial environments requiring extended thermal reliability. |
Pinout & Package
MAX6701TKA uses an 8-pin SOT23-8 package (3.00mm × 1.75mm × 1.30mm body, 0.65mm pitch). Pin 1 marked by dot; pins 1–4 on left side, 5–8 on right side when viewing top-side marking.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 MR | Manual Reset Input | CMOS-compatible active-low input with 50kΩ internal pullup; forces reset when pulled low; debounced by 140ms timeout. |
| 2 VCC | Supply Voltage Input | Primary power rail input (1.2V–5.5V); powers internal comparators, timer, and push-pull outputs; also monitored for reset trigger. |
| 3 GND | Ground Reference | System ground return for all internal circuits and output drivers; must be low-impedance connection for noise immunity. |
| 4 PFI | Power-Fail Input | High-impedance comparator input referenced to 0.62V; accepts external resistive divider to monitor secondary supplies (e.g., 3.3V, 2.5V). |
| 5 PFO | Power-Fail Output | Active-low open-drain output; asserts when PFI < 0.62V; requires external pullup for interrupt signaling to µP. |
| 6 WDI | Watchdog Input | Edge-sensitive input; rising or falling edge clears watchdog timer; 50ns minimum pulse width detectable. |
| 7 RESET | Reset Output | Active-low push-pull output; guaranteed low ≤0.4V at 3.2mA sink; holds µP in reset during power-up, brownout, or MR assertion. |
| 8 WDO | Watchdog Output | Independent active-low push-pull output; asserts on watchdog timeout or VCC/RST_IN undervoltage; deasserts on WDI edge or MR low. |
Key Features
| Feature | Design Value |
|---|---|
| Dual Adjustable Reset Inputs | RST_IN1 and RST_IN2 accept external resistor dividers to monitor two additional supply rails (e.g., I/O and core voltages), enabling triple-voltage supervision from one IC. |
| Guaranteed Reset Validity to VCC = 1V | Ensures deterministic reset behavior during deep brownout; prevents µP from executing undefined code when main supply collapses. |
| Immunity to Short Falling-VCC Transients | Rejects sub-100ns supply dips that could falsely trigger reset, improving robustness in electrically noisy automotive or industrial power domains. |
| Independent Watchdog Output (WDO) | Provides dedicated NMI-capable fault signal separate from RESET, allowing software to distinguish between power faults and processor hangs. |
| Low Quiescent Current | 25µA typical supply current at 5V - minimizes standby power in battery-backed or energy-sensitive applications. |
Applications
| Automotive Engine Control Unit (ECU) | Industrial PLC I/O Module |
|---|---|
Use Scenario: Monitoring 5V sensor supply, 3.3V MCU core, and 2.5V ADC reference in engine management system exposed to wide temperature and load dump transients. IC Role / Device Role / Timing Role: Primary supervisory IC asserting RESET during cold cranking (VCC dip), brownout, or firmware lockup; WDO triggers NMI for diagnostic logging. Use Value: Triple-voltage supervision ensures deterministic restart after transient faults; 125°C rating supports under-hood placement without derating. | Use Scenario: Power sequencing and fault detection in modular PLC backplane where multiple isolated DC/DC rails feed CPU, FPGA, and analog I/O sections. IC Role / Device Role / Timing Role: Central reset coordinator using PFI to monitor auxiliary 3.3V rail; PFO interrupts controller before main 5V fails; MR enables field-service reset. Use Value: Early power-fail warning allows graceful shutdown of I/O states and nonvolatile register save; 140ms timeout prevents spurious resets during brief line sags. |
| Networking Router Management ASIC | White Goods Main Control Board |
Use Scenario: Supervising 1.2V FPGA core, 3.3V PHY interface, and 5V PoE controller in carrier-grade router with hot-swap capability. IC Role / Device Role / Timing Role: Dual RST_IN inputs track auxiliary rails; WDO connected to FPGA NMI pin for hang recovery; MR tied to service button. Use Value: Independent watchdog output enables firmware-level error handling without resetting entire system; push-pull RESET eliminates need for external pullup. | Use Scenario: Monitoring 5V MCU supply, 3.3V display driver, and 2.5V temperature sensor rail in washing machine main board operating in high-humidity, vibration-prone environment. IC Role / Device Role / Timing Role: Primary reset source during AC power-on; PFI used to detect rectified DC rail collapse; MR enables door-open reset. Use Value: 0.62V PFI threshold enables accurate early-warning detection of bulk capacitor discharge; 125°C rating accommodates sealed enclosure thermal buildup. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6702TKA | Active-high push-pull RESET output instead of active-low; identical watchdog, PFI/PFO, and triple-supply monitoring functions. | Suitable where host µP requires active-high reset polarity (e.g., certain ARM Cortex-M variants with inverted reset input). | Select MAX6702TKA only if system-level reset logic demands high-true assertion; otherwise MAX6701TKA provides direct compatibility with standard µP reset inputs. |
| MAX6705TKA | Same active-low push-pull RESET and watchdog, but adds independent adjustable PFI/PFO comparator (dual-threshold capability) and removes RST_IN2 input. | Better suited for dual-rail systems (e.g., VCC + one auxiliary supply) where early power-fail warning timing must be independently tuned from reset threshold. | Choose MAX6705TKA when PFI hysteresis or independent trip point adjustment is required; MAX6701TKA retains full triple-monitoring flexibility. |
Compared with MAX6702TKA and MAX6705TKA, the MAX6701TKA uniquely combines active-low reset, triple adjustable supply monitoring (VCC + RST_IN1 + RST_IN2), and independent WDO - making it optimal for complex multivoltage systems requiring deterministic low-true reset assertion and comprehensive fault coverage.
Availability
MAX6701TKA is available at Aetrix Electronics and suitable for automotive engine control units, industrial PLC modules, networking router management ASICs, and white goods main control boards requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6701TKA 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, emphasizing high reliability, small footprint, and extended temperature performance.
The MAX6701–MAX6708 family was engineered specifically for microprocessor power supervision in space-constrained, thermally harsh environments - delivering integrated reset, watchdog, power-fail warning, and manual reset in a single 8-pin SOT23 package.
FAQ
What is the reset threshold voltage for MAX6701TKA?
The MAX6701TKA features a fixed 4.63V reset threshold (L-suffix), specified over -40°C to +125°C with ±3% tolerance. This value is factory-trimmed and applies to the VCC input; RST_IN1 and RST_IN2 thresholds are set externally via resistor dividers referenced to the internal 0.62V comparator.
Does MAX6701TKA support monitoring three different supply voltages?
Yes, MAX6701TKA supports triple-voltage monitoring: VCC (4.63V threshold), plus two user-adjustable supplies via RST_IN1 and RST_IN2 pins. Each adjustable input uses an external resistor divider to set its trip point relative to the 0.62V internal reference, enabling supervision of diverse rails like 3.3V, 2.5V, or 1.8V.
What is the function of the WDO pin on MAX6701TKA?
The WDO (Watchdog Output) pin on MAX6701TKA is an independent active-low push-pull output that asserts low on watchdog timeout (1.6s), VCC undervoltage, or MR assertion. It deasserts only upon a valid WDI edge or MR low - providing a dedicated fault signal for NMI or diagnostic logging without affecting the primary RESET line.
Can MAX6701TKA operate down to 1V supply voltage?
Yes, MAX6701TKA guarantees valid reset output functionality down to VCC = 1V. Below 1V, the RESET output becomes high-impedance; however, the device continues asserting RESET low until VCC drops below 1V, ensuring µP remains held in reset throughout deep brownout conditions.
How does the manual reset (MR) input interact with the watchdog timer in MAX6701TKA?
In MAX6701TKA, pulling MR low forces immediate RESET assertion and also clears the watchdog timer - causing WDO to deassert if previously asserted. This allows MR to serve both as a hardware reset trigger and as a watchdog reset mechanism, enabling field-service recovery from firmware hangs without power cycling.
MAX6701TKA 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:
- 3.08V, 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
MAX6701TKA FAQ
1.How can I place an order for MAX6701TKA through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6701TKA 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 MAX6701TKA reliable?
The price and inventory of MAX6701TKA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6701TKA is usually 5 days.
3.What payment methods are accepted for MAX6701TKA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6701TKA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6701TKA?
MAX6701TKA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6701TKA 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 MAX6701TKA?
For technical support, including MAX6701TKA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6701TKA requirements.
6.How does Aetrix verify that MAX6701TKA is sourced from the original manufacturer or authorized distributors?
All MAX6701TKA 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 MAX6701TKA meets industry standards.
7.What is the process for return or replacement of MAX6701TKA?
All MAX6701TKA units undergo pre-shipment inspection (PSI). If there is an issue with MAX6701TKA, 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 MAX6701TKA part is unused and in its original packaging.
Return procedure for MAX6701TKA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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