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Analog Devices Inc./Maxim Integrated MAX6706ZKA
- Part No.:
- MAX6706ZKA
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-8
- Datasheet:
-
MAX6706ZKA.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL SOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:819
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Product details
Overview
MAX6706ZKA from Maxim Integrated is an active-high push-pull microprocessor supervisory IC in 8-pin SOT23-8 package, monitoring single-supply voltage with 2.32V reset threshold (Z suffix), 140ms reset timeout, independent power-fail comparator (0.62V reference), and 1.6s watchdog timer with dedicated WDO output. It ensures reliable µP reset during power-up, brownout, and watchdog timeout in embedded control systems.
For engineers reviewing the MAX6706ZKA datasheet, MAX6706ZKA pinout, MAX6706ZKA application, or MAX6706ZKA equivalent, key selection criteria include its active-high reset output, VCC = 1V guaranteed operation, 0.62V PFI threshold for early power-fail warning, and compatibility with +2.5V/+3.3V system rails requiring precise undervoltage supervision.
Technical Context
The MAX6706ZKA implements a dual-comparator architecture: one fixed-threshold monitor for VCC (2.32V) and a separate 0.62V reference-based comparator for PFI, enabling independent power-fail detection. Its watchdog circuit asserts WDO low after 1.6s of no WDI edge transition, and resets automatically upon VCC recovery or MR assertion.
Unlike MAX6704/MAX6708, it provides independent WDO and RESET outputs; unlike MAX6701–MAX6703 variants, it lacks RST_IN1/RST_IN2 inputs and monitors only VCC. The A-version (indicated by 'A' in full part number) enables immediate WDO deassertion on VCC recovery without timeout delay.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.32V (Z suffix), ±3% over -40°C to +125°C - sets precise VCC brownout detection point for +2.5V systems |
| Reset Timeout Delay | 140ms (typ), 120–300ms (min–max) - guarantees µP reset hold time sufficient for stable clock and memory initialization |
| Watchdog Timeout | 1.6s (typ), 0.96–2.52s (min–max) - provides robust software activity monitoring with temperature-stable timing |
| PFI Threshold | 0.62V (typ), 6mV hysteresis - enables accurate early-warning power-fail detection via external resistor divider |
| Supply Voltage Range | 1.2V to 5.5V - supports operation down to 1.2V VCC while maintaining valid reset assertion |
| Output Type | Active-high push-pull RESET, open-drain WDO - eliminates external pull-up for RESET; allows wired-OR for WDO |
| Guaranteed Operation | RESET valid to VCC = 1V - ensures deterministic reset behavior during deep brownout or controlled power-down |
Pinout & Package
MAX6706ZKA uses an 8-pin SOT23-8 package (3.00mm × 1.75mm × 1.30mm body, 0.65mm pitch). Pin 1 marked with dot; pins 1–4 on left side, 5–8 on right side (top view).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 MR | Manual Reset Input | Active-low CMOS input with 50kΩ internal pullup; forces reset when pulled low; used to trigger watchdog-initiated reset via WDO feedback |
| 2 VCC | Supply Voltage Input | Primary power rail input (1.2–5.5V); powers internal comparators, timer, and push-pull RESET output |
| 3 GND | Ground Reference | System ground return for all internal circuits and output drivers |
| 4 PFI | Power-Fail Input | High-impedance comparator input referenced to 0.62V; connects to external divider for secondary supply monitoring |
| 5 PFO | Power-Fail Output | Active-low open-drain output asserted when PFI < 0.62V; used to interrupt µP before main supply collapse |
| 6 WDI | Watchdog Input | Edge-sensitive input; rising/falling transition clears watchdog timer; 50ns minimum pulse width detectable |
| 7 RESET | Reset Output | Active-high push-pull output; goes high when VCC > 2.32V and remains high for 140ms after recovery |
| 8 WDO | Watchdog Output | Active-low open-drain output asserted on watchdog timeout or VCC/RST_IN undervoltage; deasserts on WDI edge or MR low (A-version) |
Key Features
| Feature | Design Value |
|---|---|
| Active-High Push-Pull RESET | Eliminates need for external pull-up resistor; drives µP reset pin directly with rail-to-rail logic levels |
| Independent Power-Fail Comparator | 0.62V internal reference enables configurable early-warning detection of auxiliary supplies (e.g., I/O or analog rails) |
| 1.6s Watchdog Timer with WDO | Dedicated watchdog output allows NMI-triggered error handling without interfering with primary reset state |
| Guaranteed Operation to VCC = 1V | Ensures predictable reset behavior during slow power-down sequences common in battery-backed or energy-harvesting systems |
| Immunity to Short VCC Transients | Rejects sub-100ns supply glitches, preventing spurious resets in electrically noisy industrial environments |
Applications
| Industrial PLC Controller | Automotive Body Control Module |
|---|---|
Use Scenario: Monitors 2.5V core supply and 3.3V I/O rail in programmable logic controller with real-time OS. IC Role / Device Role / Timing Role: Provides active-high RESET to ARM Cortex-M7 processor and independent PFO interrupt for orderly shutdown on 12V battery sag. Use Value: 2.32V threshold matches 2.5V LDO tolerance; 140ms timeout exceeds processor's required reset hold time. | Use Scenario: Supervises 2.5V microcontroller supply in door module exposed to load-dump transients. IC Role / Device Role / Timing Role: Generates clean reset pulse during ignition cycling and triggers watchdog reset if firmware hangs during CAN message processing. Use Value: Immunity to 100ns VCC glitches prevents false resets during alternator switching noise. |
| Medical Infusion Pump | Smart Energy Meter |
Use Scenario: Ensures fail-safe reset of safety-critical MCU during battery switchover in portable infusion device. IC Role / Device Role / Timing Role: Uses PFI to monitor backup coin-cell voltage and assert PFO to initiate graceful drug delivery stop before power loss. Use Value: 0.62V PFI threshold enables detection of CR2032 end-of-life (2.0V → 1.8V drop) with margin. | Use Scenario: Supervises 3.3V metrology SoC and 2.5V ADC reference in DIN-rail meter with HPLC communication. IC Role / Device Role / Timing Role: Delivers active-high RESET synchronized to AC zero-crossing startup and watchdog monitors firmware execution in isolation amplifier loop. Use Value: VCC = 1V operation guarantees reset validity during capacitor-held brownout between AC half-cycles. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervision applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6706AKA-T | A-version: WDO deasserts immediately on VCC recovery (no timeout delay); same 2.32V threshold and pinout | Better suited for systems requiring rapid watchdog recovery after transient brownout without waiting for timeout expiration | Select MAX6706AKA-T if immediate WDO release on VCC rise is required; otherwise MAX6706ZKA provides standard latched WDO behavior |
| TPS3808G33DBVR | TI part with 3.3V fixed threshold, 200ms reset timeout, no PFI/PFO, no watchdog output - only RESET and MR | Lacks power-fail warning and independent watchdog output; suitable only for basic reset-only applications | Choose TPS3808G33DBVR only when PFI/PFO and WDO functions are unnecessary and 3.3V threshold suffices |
Compared with MAX6706AKA-T, MAX6706ZKA offers standard watchdog latching behavior ideal for fault-locked systems, while TPS3808G33DBVR omits critical supervision features like PFI monitoring and independent WDO, limiting use to simple reset-only designs.
Availability
MAX6706ZKA is available at Aetrix Electronics and suitable for industrial PLC controllers, automotive body control modules, medical infusion pumps, and smart energy meters requiring stable component supply across extended temperature ranges.
Supply support for MAX6706ZKA 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 industrial, automotive, and computing applications, emphasizing reliability and integration.
The MAX6701–MAX6708 family delivers compact, low-power µP supervision with multi-function integration-specifically engineered for space-constrained embedded systems needing coordinated reset, watchdog, and power-fail response.
FAQ
What is the reset threshold voltage for MAX6706ZKA and how is it determined?
The MAX6706ZKA has a nominal reset threshold of 2.32V, defined by the 'Z' suffix per Maxim's Threshold Suffix Guide. This value is factory-trimmed and specified over -40°C to +125°C with ±3% tolerance. It applies exclusively to the VCC supply monitoring function and is not adjustable. The threshold is internally generated and does not require external components.
Does MAX6706ZKA support active-high reset output and what are its drive capabilities?
Yes, MAX6706ZKA provides an active-high push-pull RESET output. When asserted, it sources up to 800µA at VCC ≥ 4.75V while maintaining VOH ≥ 0.8 × VCC; when deasserted, it sinks up to 3.2mA at VCC ≥ 4.75V with VOL ≤ 0.4V. This eliminates external pull-up resistors and ensures robust driving of modern µP reset inputs.
How does the power-fail comparator in MAX6706ZKA function and what is its reference voltage?
The MAX6706ZKA includes a dedicated power-fail comparator with a precise 0.62V internal reference. The PFI pin connects to an external resistor divider to set the trip point for auxiliary supplies; PFO asserts low when PFI falls below 0.62V. Hysteresis is 6mV, and input leakage is ±200nA over temperature, enabling high-impedance, low-power monitoring.
What is the watchdog timeout period for MAX6706ZKA and how is it cleared?
The MAX6706ZKA watchdog timeout is 1.6s typical (0.96–2.52s min–max). It is cleared by any rising or falling edge on WDI, assertion of MR, or VCC reset event. WDO remains low until cleared and does not auto-deassert on VCC recovery unless the part is an A-version (MAX6706AKA-T), which differs from MAX6706ZKA.
Can MAX6706ZKA operate reliably at very low supply voltages, and down to what level?
Yes, MAX6706ZKA guarantees valid RESET output down to VCC = 1V. Below 1V, the RESET output becomes high-impedance (open circuit), but above 1V, it maintains specified VOH/VOL performance. This enables safe operation during controlled brownout conditions and battery-powered systems with gradual discharge profiles.
MAX6706ZKA 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:
- 2
- Voltage - Threshold:
- 2.32V, Adj
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active High
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-8
MAX6706ZKA FAQ
1.How can I place an order for MAX6706ZKA through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6706ZKA 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 MAX6706ZKA reliable?
The price and inventory of MAX6706ZKA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6706ZKA is usually 5 days.
3.What payment methods are accepted for MAX6706ZKA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6706ZKA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6706ZKA?
MAX6706ZKA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6706ZKA 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 MAX6706ZKA?
For technical support, including MAX6706ZKA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6706ZKA requirements.
6.How does Aetrix verify that MAX6706ZKA is sourced from the original manufacturer or authorized distributors?
All MAX6706ZKA 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 MAX6706ZKA meets industry standards.
7.What is the process for return or replacement of MAX6706ZKA?
All MAX6706ZKA units undergo pre-shipment inspection (PSI). If there is an issue with MAX6706ZKA, 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 MAX6706ZKA part is unused and in its original packaging.
Return procedure for MAX6706ZKA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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