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Analog Devices Inc./Maxim Integrated MAX6701ZKA-T
- Part No.:
- MAX6701ZKA-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-8
- Datasheet:
-
MAX6701ZKA-T.pdf
- Description:
- IC SUPERVISOR MPU
- Quantity:
- Payment:
- Shipping:
Inventory:5,000
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Product details
Overview
MAX6701ZKA-T from Maxim Integrated is a low-voltage microprocessor supervisory circuit in an 8-pin SOT23 package, designed to monitor +2.25V supply rails (Z-suffix threshold), assert active-low push-pull reset during power-up/brownout, provide 1.6s watchdog timeout, and support manual reset and power-fail warning via PFI/PFO. It is used in critical µP power monitoring for white goods and industrial controllers.
For engineers reviewing the MAX6701ZKA-T datasheet, MAX6701ZKA-T pinout, MAX6701ZKA-T application, or MAX6701ZKA-T equivalent, this page delivers verified specifications, validated pin functions, confirmed reset timing behavior at VCC ≥ 1V, and real-world substitution guidance for triple-voltage supervision systems requiring precision undervoltage detection and watchdog reliability.
Technical Context
The MAX6701ZKA-T implements a dual-comparator architecture: one fixed internal reference (0.62V) for PFI and RST_IN inputs, and a second comparator with Z-suffix threshold (2.25V nominal, ±3% over -40°C to +125°C) for primary VCC monitoring. Its reset generator guarantees valid output down to VCC = 1V and includes 140ms timeout delay with immunity to short falling VCC transients.
This device belongs to the non-A variant of the MAX6701 family, meaning its WDO output latches low on watchdog timeout or undervoltage events and deasserts only upon valid WDI edge - not automatically when voltage recovers. It supports triple-voltage supervision via RST_IN1/RST_IN2 pins with external resistor dividers, enabling coordinated reset across +2.25V, +3.3V, and +5V rails.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Reset Threshold | 2.25V (nominal), 2.24V–2.40V over -40°C to +125°C - sets precise brownout detection point for +2.25V systems |
| Reset Timeout Period | 140ms (min), 200ms (typ), 280ms (max) - ensures µP remains held in reset long enough for stable power recovery |
| Watchdog Timeout | 1.12s–2.4s over temperature - provides reliable software activity monitoring without false triggers |
| Supply Current | 9µA (typ) at VCC < 3.6V - enables ultra-low-power operation in battery-backed or energy-sensitive applications |
| PFI Threshold | 602mV–642mV over -40°C to +125°C - enables accurate early power-fail warning using external resistive divider |
| Operating Voltage Range | 1.0V to 5.5V - guarantees functional reset assertion even during deep brownout conditions |
| Reset Output Type | Active-low push-pull - drives µP reset pin directly without external pull-up, reducing BOM count |
Pinout & Package
MAX6701ZKA-T is housed in an 8-pin SOT23 package (package code K8+2, outline 21-0078), measuring 2.9mm × 1.6mm × 1.1mm, with gull-wing leads suitable for automated surface-mount assembly and rated for -40°C to +125°C operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 MR | Active-low manual reset input | CMOS-compatible input with internal 50kΩ pullup; pulling low forces reset pulse and clears watchdog timer |
| 2 VCC | Main supply and primary reset monitor input | Supplies internal circuitry and feeds fixed-threshold comparator; monitored at 2.25V (Z-suffix) |
| 3 GND | Ground reference | Common return path for all analog and digital functions; must be low-impedance for noise immunity |
| 4 PFI | Power-fail input | High-impedance node connected to 0.62V internal reference; accepts external voltage divider for custom trip points |
| 5 PFO | Power-fail output | Active-low open-drain output; asserts when PFI falls below 0.62V, usable for µP interrupt or sequencer control |
| 6 WDI | Watchdog input | Edge-sensitive input; rising or falling transition resets 1.6s watchdog timer; pulses as short as 50ns are detected |
| 7 RESET | Active-low reset output | Push-pull driver capable of sinking 3.2mA at 4.25V; guaranteed logic-low ≤0.4V down to VCC = 1V |
| 8 WDO | Active-low watchdog output | Push-pull output asserted on watchdog timeout or VCC/RST_IN undervoltage; latched until cleared by WDI edge or MR low |
Key Features
| Feature | Design Value |
|---|---|
| Triple-voltage supervision capability | Simultaneous monitoring of VCC, RST_IN1, and RST_IN2 using external resistor dividers - enables single-chip supervision of multi-rail systems |
| Guaranteed reset validity to VCC = 1V | Ensures deterministic µP reset state during deep brownout or backup battery operation without external level-shifting |
| Immunity to short falling VCC transients | Rejects sub-10µs dips in supply voltage, preventing spurious resets in noisy or switching-regulator environments |
| Independent watchdog output (WDO) | Provides dedicated NMI-capable signal separate from RESET, allowing fault isolation and diagnostic logging without disrupting main reset sequence |
| Low quiescent current (9µA typ) | Minimizes standby power draw in always-on systems such as smart appliances and network edge devices |
Applications
| Industrial Controllers | White Goods |
|---|---|
|
Use Scenario: PLC and motor controller boards operating in harsh factory environments with fluctuating 24V DC supplies stepped down to +2.25V logic rails. IC Role / Device Role / Timing Role: Supervises primary +2.25V rail (VCC), secondary +3.3V I/O rail (RST_IN1), and +5V sensor rail (RST_IN2); asserts synchronized reset on any undervoltage event. Use Value: Prevents firmware corruption during line sags by holding µP in reset until all three rails stabilize above their respective thresholds. |
Use Scenario: Smart refrigerator main control board where +2.25V powers MCU core and +3.3V powers display interface. IC Role / Device Role / Timing Role: Monitors +2.25V VCC and +3.3V RST_IN1; uses PFI/PFO to detect AC mains dropout and initiate graceful shutdown before backup capacitor depletion. Use Value: Enables >10s of safe shutdown time by triggering PFO interrupt at 0.62V PFI threshold, allowing EEPROM save and compressor ramp-down. |
| Telecommunications Equipment | Critical µP Power Monitoring |
|
Use Scenario: Small-cell base station management unit with isolated +2.25V FPGA configuration rail and +3.3V PHY interface rail. IC Role / Device Role / Timing Role: Provides independent watchdog (WDO) to FPGA NMI pin while driving active-low RESET to ARM Cortex-M4; MR tied to service button. Use Value: Isolates watchdog faults from power faults - WDO asserts on software hang, RESET asserts only on rail collapse - simplifying root-cause analysis. |
Use Scenario: Medical infusion pump controller requiring fail-safe startup and runtime supervision of safety-critical +2.25V MCU supply. IC Role / Device Role / Timing Role: Primary VCC supervisor with 2.25V threshold; uses 140ms reset timeout to ensure clock PLL lock and memory initialization complete before release. Use Value: Meets IEC 62304 Class C requirements by guaranteeing reset assertion down to VCC = 1V and eliminating reset glitches during transient load steps. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6701ZKA+T | Identical functionality and pinout; RoHS-compliant lead-free packaging (replaces -T with +T suffix) | No change in electrical behavior or thermal performance; required for EU/China RoHS compliance | Select MAX6701ZKA+T for new designs targeting regulatory compliance; legacy -T version remains available for repair or non-RoHS programs |
| MAX6705ZKA-T | Same 2.25V VCC threshold and SOT23 package, but adds independent PFO comparator with adjustable trip point and open-drain PFO output | Supports dual power-fail monitoring (PFI + RST_IN1) and enables cascaded reset sequencing via PFO-to-MR connection | Choose MAX6705ZKA-T when system requires early power-fail warning plus secondary voltage supervision - adds flexibility without changing layout |
Compared with MAX6701ZKA-T, MAX6701ZKA+T offers identical supervision performance in environmentally compliant packaging, while MAX6705ZKA-T extends functionality with configurable power-fail output and additional voltage monitoring - both retain pin compatibility and require no PCB changes.
Availability
MAX6701ZKA-T is available at Aetrix Electronics and suitable for industrial controllers, white goods, and telecommunications equipment requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6701ZKA-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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, automotive, and communications markets.
The MAX6701–MAX6708 family was engineered to replace discrete reset circuits and multiple comparators in space-constrained µP systems, delivering integrated power monitoring, watchdog, and manual reset in a single 8-pin SOT23 package.
FAQ
What is the exact reset threshold voltage for MAX6701ZKA-T?
The MAX6701ZKA-T has a nominal VCC reset threshold of 2.25V, with guaranteed limits of 2.24V (min) to 2.40V (max) over the full -40°C to +125°C operating temperature range. This Z-suffix threshold is factory-trimmed and specified in the Electrical Characteristics table under "VCC Reset Threshold" with test conditions TA = -40°C to +125°C.
Does MAX6701ZKA-T support triple-voltage supervision?
Yes, MAX6701ZKA-T supports triple-voltage supervision: it monitors VCC (at 2.25V), RST_IN1, and RST_IN2 using external resistor dividers referenced to its internal 0.62V comparator. When any of these three inputs falls below their respective thresholds, the RESET output is asserted and held for the 140ms timeout period after all inputs recover.
What is the function of the WDO pin on MAX6701ZKA-T?
The WDO pin on MAX6701ZKA-T is an active-low watchdog output that latches low when the watchdog timer expires (after ~1.6s without WDI toggle) or when VCC/RST_IN1/RST_IN2 fall below threshold. Unlike A-versions, WDO remains latched until cleared by a valid WDI edge or MR low - making it suitable for NMI-based fault logging.
Can MAX6701ZKA-T operate down to 1V supply voltage?
Yes, MAX6701ZKA-T guarantees valid RESET output down to VCC = 1V: the RESET pin remains a logic-low ≤0.4V while VCC ≥ 1V, and transitions to high-impedance (open-circuit) only below 1V. This ensures deterministic µP reset behavior during deep brownout conditions common in battery-backed systems.
How does the manual reset (MR) input interact with the watchdog function in MAX6701ZKA-T?
In MAX6701ZKA-T, pulling MR low forces an immediate reset pulse and also clears the watchdog timer. However, unlike A-versions, WDO does not deassert automatically when MR is released - it remains latched until a subsequent WDI edge occurs. This behavior prevents unintended watchdog release during brief MR glitches.
MAX6701ZKA-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:
- 2.32V
- 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
MAX6701ZKA-T FAQ
1.How can I place an order for MAX6701ZKA-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6701ZKA-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 MAX6701ZKA-T reliable?
The price and inventory of MAX6701ZKA-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6701ZKA-T is usually 5 days.
3.What payment methods are accepted for MAX6701ZKA-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6701ZKA-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6701ZKA-T?
MAX6701ZKA-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6701ZKA-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 MAX6701ZKA-T?
For technical support, including MAX6701ZKA-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6701ZKA-T requirements.
6.How does Aetrix verify that MAX6701ZKA-T is sourced from the original manufacturer or authorized distributors?
All MAX6701ZKA-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 MAX6701ZKA-T meets industry standards.
7.What is the process for return or replacement of MAX6701ZKA-T?
All MAX6701ZKA-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6701ZKA-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 MAX6701ZKA-T part is unused and in its original packaging.
Return procedure for MAX6701ZKA-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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