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Analog Devices Inc./Maxim Integrated MAX6701ZKA+
- Part No.:
- MAX6701ZKA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-8
- Datasheet:
-
MAX6701ZKA+.pdf
- Description:
- IC SUPERVISOR 3 CHANNEL SOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:1,832
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Product details
Overview
MAX6701ZKA+ from Maxim Integrated is a low-voltage 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 +2.32V supply (Z-suffix threshold), asserts reset down to VCC = 1V, and supports brownout detection in automotive and industrial control systems.
For engineers reviewing the MAX6701ZKA+ datasheet, MAX6701ZKA+ pinout, MAX6701ZKA+ application, or MAX6701ZKA+ equivalent, this device delivers precision voltage supervision with integrated watchdog, power-fail warning, and manual reset - critical for reliable µP startup, fault recovery, and orderly shutdown in embedded systems.
Technical Context
The MAX6701ZKA+ implements a dual-comparator architecture: one fixed-threshold monitor for VCC (2.32V ±3%, Z-suffix) and a separate 0.62V reference-based comparator for PFI. Its reset generator guarantees valid logic-low output (≤0.4V) at VCC ≥1V and holds reset for 140ms–300ms after threshold violation.
The integrated watchdog timer resets on WDI edge transitions within 1.6s (typ), with independent WDO assertion on timeout or undervoltage; MR input provides debounced manual reset with 50kΩ internal pullup and 200ns delay to RESET assertion.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.32V (Z-suffix), ±3% over -40°C to +125°C - sets precise brownout detection point for +2.3V–+2.5V supply rails |
| Reset Timeout Period | 140ms (min), 300ms (max) - ensures µP remains held in reset long enough to stabilize clocks and peripherals |
| Watchdog Timeout | 1.6s (typ), 0.96s–2.52s (min–max) - provides robust software activity monitoring without false triggers from transient noise |
| Power-Fail Input Threshold | 0.62V (typ), ±25mV hysteresis - enables early warning of supply collapse using external resistor divider |
| Supply Current | 9µA (typ) at VCC = 3.3V - minimizes quiescent load in battery-backed or low-power systems |
| Operating Voltage Range | 1.2V to 5.5V - supports operation during deep brownout and ensures reset validity even as VCC falls to 1V |
| Output Type | Active-low push-pull RESET - eliminates need for external pullup resistor and drives CMOS/TTL loads directly |
Pinout & Package
MAX6701ZKA+ 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 with marking dot upper-left.
| 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; glitch rejection >100ns |
| 2 VCC | Supply Voltage Input | Primary power rail input (1.2V–5.5V); powers internal comparators, timer, and push-pull outputs |
| 3 GND | Ground Reference | System ground return for all internal circuits and output drivers |
| 4 PFI | Power-Fail Input | High-impedance (±200nA leakage) comparator input referenced to 0.62V; accepts external voltage divider for secondary supply monitoring |
| 5 PFO | Power-Fail Output | Active-low open-drain output asserted when PFI < 0.62V; requires external pullup for interrupt signaling |
| 6 WDI | Watchdog Input | Edge-sensitive input; rising or falling transition clears watchdog timer; 50ns minimum pulse width detectable |
| 7 RESET | Reset Output | Active-low push-pull output; guaranteed ≤0.4V at ISINK = 1.2mA; remains asserted for full timeout after VCC recovery |
| 8 WDO | Watchdog Output | Active-low push-pull output; asserted on watchdog timeout or VCC/RST_IN undervoltage; deasserts on valid WDI edge or MR low (A-version) |
Key Features
| Feature | Design Value |
|---|---|
| Guaranteed reset validity to VCC = 1V | Ensures deterministic µP reset behavior during deep brownout, eliminating race conditions in low-VCC states |
| Immunity to short falling VCC transients | Rejects <100ns supply dips, preventing spurious resets in electrically noisy environments like automotive power nets |
| Independent power-fail comparator with external PFI/PFO | Enables early-warning power-fail detection on secondary rails (e.g., I/O supply) without additional ICs |
| 140ms minimum reset timeout | Meets JEDEC JESD78 requirements for minimum reset pulse width across full temperature range |
| Low 9µA supply current | Extends battery life in always-on supervisory applications such as smart sensors and backup controllers |
Applications
| Automotive Engine Control Unit (ECU) | Industrial PLC I/O Module |
|---|---|
Use Scenario: Monitors 2.32V core supply and 3.3V I/O rail in engine management system under wide temperature (-40°C to +125°C) and high EMI conditions. IC Role / Device Role / Timing Role: Primary supervisor asserting RESET during cold-crank brownout and generating NMI via WDO on software hang. Use Value: Prevents corrupted flash writes and invalid sensor reads by guaranteeing µP reset until both supplies stabilize above 2.32V and 3.3V thresholds. |
Use Scenario: Supervises 2.32V FPGA configuration supply and 5V backplane interface in modular automation controller. IC Role / Device Role / Timing Role: Dual-role supervisor: RESET output holds FPGA in configuration reset; PFI/PFO pair triggers graceful I/O shutdown before main supply collapse. Use Value: Eliminates need for discrete comparators and RC timers, reducing BOM count by 4 components while improving timing accuracy to ±3%. |
| White Goods Main Control Board | Telecom Remote Radio Unit (RRU) |
Use Scenario: Provides fail-safe reset for 2.32V MCU in washing machine control board exposed to line surges and motor-induced transients. IC Role / Device Role / Timing Role: Brownout detector and watchdog co-processor: MR input tied to door-lock switch; WDO connected to MCU NMI for firmware crash recovery. Use Value: Enables certified Class B EMC compliance by rejecting sub-100ns VCC glitches common during brushless motor commutation. |
Use Scenario: Supervises 2.32V transceiver ASIC supply in outdoor 5G RRU operating at -40°C ambient with rapid thermal cycling. IC Role / Device Role / Timing Role: High-reliability supervisor with extended temperature rating: RESET output qualified for 1000+ power cycles without parameter drift. Use Value: Reduces field failure rate by 62% vs. discrete solutions due to matched temperature coefficients across internal comparators and reference. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervision applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6701TCA+ | 3.08V reset threshold (T-suffix), same pinout and features | Designed for +3.3V systems; not suitable for 2.3V rails without external scaling | Select when supervising standard 3.3V µP cores where 3.08V trip point matches regulator tolerance |
| TPS3808G12DBVR | 1.2V reset threshold, 200ms fixed timeout, no PFI/PFO, SOT23-6 package | Lacks power-fail warning and watchdog output; smaller footprint but reduced feature set | Choose for cost-sensitive, space-constrained designs where only basic reset is required |
Compared with MAX6701TCA+, MAX6701ZKA+ enables tighter brownout detection on 2.3V supplies while retaining full watchdog and PFI functionality; versus TPS3808G12DBVR, it adds critical power-fail warning and independent watchdog output at the cost of two extra pins and higher integration.
Availability
MAX6701ZKA+ is available at Aetrix Electronics and suitable for automotive engine control units, industrial PLC modules, white goods main boards, and telecom remote radio units requiring stable component supply across extended temperature ranges.
Supply support for MAX6701ZKA+ 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 demanding industrial, automotive, and communications applications.
The MAX6701–MAX6708 family was designed to replace discrete reset circuits in µP-based systems, integrating reset generation, watchdog timing, and power-fail warning into a single 8-pin SOT23 package for space- and cost-constrained embedded designs.
FAQ
What is the exact reset threshold voltage for MAX6701ZKA+?
The MAX6701ZKA+ has a factory-trimmed reset threshold of 2.32V (Z-suffix), with ±3% tolerance over the full operating temperature range of -40°C to +125°C. This value is specified in the Electrical Characteristics table under "VCC Reset Threshold (VCC falling)" and applies directly to the VCC input pin without external components.
Does MAX6701ZKA+ support manual reset triggering, and how is it implemented?
Yes, MAX6701ZKA+ supports manual reset via the MR pin (Pin 1), which is an active-low CMOS input with a 50kΩ internal pullup to VCC. Pulling MR low forces RESET assertion for the full timeout period (140–300ms) after MR returns high. The device includes 100ns glitch rejection and 200ns MR-to-RESET delay, making it suitable for pushbutton interfaces without external debounce circuitry.
Can MAX6701ZKA+ monitor a secondary supply voltage besides VCC?
Yes, MAX6701ZKA+ can monitor secondary supplies using its PFI pin (Pin 4), which connects to an internal 0.62V comparator. By applying a resistive divider from the secondary supply to PFI, users can configure early power-fail warning at any voltage above ~0.62V. The corresponding PFO output (Pin 5) goes active-low when the divided voltage drops below threshold, enabling µP interrupt-driven shutdown sequences.
What is the watchdog timeout behavior of MAX6701ZKA+, and how does it interact with reset?
MAX6701ZKA+ features a 1.6s (typ) watchdog timer that asserts WDO low if WDI (Pin 6) receives no edge transition within that period. Unlike some supervisors, the watchdog timer remains cleared during RESET assertion and only starts counting after RESET deasserts. WDO is independent of RESET - it asserts on timeout or VCC undervoltage, and deasserts on valid WDI edge or MR low (A-version behavior confirmed for MAX6701ZKA+).
Is MAX6701ZKA+ compatible with lead-free PCB assembly processes?
Yes, MAX6701ZKA+ is supplied in lead-free packaging compliant with RoHS and JEDEC J-STD-020 reflow profiles. The "+" suffix in the part number explicitly denotes lead-free finish. It supports peak reflow temperatures up to +260°C (per JEDEC Level 3 moisture sensitivity) and is qualified for standard Pb-free soldering processes without derating or special handling requirements.
MAX6701ZKA+ 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+ FAQ
1.How can I place an order for MAX6701ZKA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6701ZKA+ 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+ reliable?
The price and inventory of MAX6701ZKA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6701ZKA+ is usually 5 days.
3.What payment methods are accepted for MAX6701ZKA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6701ZKA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6701ZKA+?
MAX6701ZKA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6701ZKA+ 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+?
For technical support, including MAX6701ZKA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6701ZKA+ requirements.
6.How does Aetrix verify that MAX6701ZKA+ is sourced from the original manufacturer or authorized distributors?
All MAX6701ZKA+ 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+ meets industry standards.
7.What is the process for return or replacement of MAX6701ZKA+?
All MAX6701ZKA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6701ZKA+, 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+ part is unused and in its original packaging.
Return procedure for MAX6701ZKA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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