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Analog Devices Inc./Maxim Integrated MAX6705ZKA
- Part No.:
- MAX6705ZKA
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-8
- Datasheet:
-
MAX6705ZKA.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL SOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:111
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Product details
Overview
The MAX6705ZKA from Maxim Integrated is a low-voltage, single-supply microprocessor supervisory circuit in an 8-pin SOT23 package, featuring 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 during power-up/brownout/down, and supports critical µP power monitoring in automotive and industrial control systems.
For engineers reviewing the MAX6705ZKA datasheet, MAX6705ZKA pinout, MAX6705ZKA application, or MAX6705ZKA equivalent, this device delivers guaranteed reset validity down to VCC = 1V, immunity to short VCC transients, and independent watchdog output-key selection criteria for reliable embedded system supervision.
Technical Context
The MAX6705ZKA integrates a precision voltage monitor with fixed 2.32V reset threshold (Z-suffix), a 0.62V reference-based power-fail comparator (PFI/PFO), and a 1.6s watchdog timer with independent WDO output. Its reset generator holds RESET low for 140ms–300ms after VCC, PFI, or MR events.
Unlike triple-voltage variants (e.g., MAX6701–MAX6703), the MAX6705ZKA monitors only VCC and provides dedicated PFI/PFO for secondary supply warning. Its push-pull RESET output sinks ≤0.4V at 3.2mA (VCC ≥ 4.25V) and sources ≥0.8×VCC at 800µA, enabling direct interface with CMOS µP reset inputs.
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 +2.32V nominal supplies |
| Reset Timeout Period | 140ms (typ), 120–300ms (min–max) - ensures µP remains held in reset long enough for stable power rail recovery |
| Watchdog Timeout | 1.6s (typ), 0.96–2.52s (min–max) - provides robust software activity monitoring without false triggers |
| Power-Fail Input Threshold | 0.62V (typ), ±6mV hysteresis - enables accurate early-warning detection of secondary supply collapse via external resistor divider |
| Supply Voltage Range | 1.2V to 5.5V - guarantees operation across wide input range, including deep brownout conditions down to 1.2V |
| Reset Output Type | Active-low push-pull - eliminates need for external pull-up resistor and ensures fast, low-impedance reset assertion |
| Quiescent Current | 9µA (typ) at VCC < 3.6V - minimizes standby power in battery-backed or energy-sensitive applications |
Pinout & Package
Package: 8-pin SOT23-8 (JEDEC MO-178 BA), 3.00mm × 1.75mm × 1.30mm body, lead-free compatible.
| 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, deasserts WDO in A-version |
| 2 VCC | Supply Voltage Input | Primary power rail input (1.2–5.5V); powers internal comparators and push-pull outputs; reset threshold referenced to this pin |
| 3 GND | Ground Reference | System ground return for all internal circuits and output drivers; must be low-impedance connection |
| 4 PFI | Power-Fail Input | High-impedance comparator input (≤200nA leakage); connects to external resistive divider to set custom power-fail trip point |
| 5 PFO | Power-Fail Output | Active-low open-drain output; asserts when PFI < 0.62V; requires external pullup for µP interrupt signaling |
| 6 WDI | Watchdog Input | Edge-triggered watchdog enable; rising/falling edge clears timer; 50ns minimum pulse width detectable |
| 7 RESET | Reset Output | Active-low push-pull output; guaranteed logic low ≤0.4V at 3.2mA sink; valid down to VCC = 1V |
| 8 WDO | Watchdog Output | Active-low push-pull output; asserts on watchdog timeout or VCC undervoltage; deasserts on WDI edge or MR low (A-version) |
Key Features
| Feature | Design Value |
|---|---|
| Guaranteed reset validity to VCC = 1V | Ensures deterministic µP reset behavior even during deep brownout, eliminating risk of undefined state entry |
| Immunity to short falling VCC transients | Rejects sub-100ns supply glitches, preventing spurious resets in electrically noisy environments like automotive ECUs |
| Independent PFI/PFO comparator | Enables early-warning power-fail detection on secondary rails (e.g., I/O supply) without affecting primary reset timing |
| 140ms minimum reset timeout | Meets JEDEC JESD22-B102 reliability requirements for µP initialization, ensuring sufficient hold time for clock stabilization |
| Low 9µA quiescent current | Reduces standby power consumption by >50% vs. legacy supervisors, critical for always-on industrial sensors |
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 MCU under harsh temperature cycling (-40°C to +125°C). IC Role / Device Role / Timing Role: Primary supervisor asserting RESET during cold cranking voltage sag; PFI senses I/O rail collapse to trigger orderly shutdown via PFO interrupt. Use Value: Prevents ECU firmware corruption during 12V battery dip to 6.5V by holding µP in reset until both supplies stabilize above 2.32V and 3.3V thresholds. |
Use Scenario: Supervises 2.32V FPGA configuration supply and 5V analog front-end in modular PLC base unit. IC Role / Device Role / Timing Role: Generates clean, glitch-immune reset pulse on power-up; WDO monitors FPGA configuration state via WDI toggling during boot sequence. Use Value: Eliminates need for discrete RC reset circuit and external watchdog IC, reducing BOM count by 3 components while improving MTBF. |
| Smart Energy Meter | Medical Infusion Pump Controller |
|
Use Scenario: Ensures reliable startup and brownout recovery of metrology SoC powered from 2.32V LDO in utility-grade electricity meter. IC Role / Device Role / Timing Role: Provides tamper-resistant reset generation with MR input tied to secure switch; PFO signals AC mains failure to backup battery manager. Use Value: Meets IEC 62053-21 accuracy requirements by guaranteeing µP reset assertion within 10µs of VCC crossing 2.32V threshold. |
Use Scenario: Supervises safety-critical ARM Cortex-M4 MCU in infusion pump, where power integrity directly impacts patient safety. IC Role / Device Role / Timing Role: Dual-role supervisor: RESET ensures deterministic boot; WDO detects firmware lockup and forces hardware reset without software intervention. Use Value: Achieves SIL-2 compliance per IEC 62304 by providing independent hardware-level watchdog with <1.6s timeout and no single-point failure path. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervision applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6705AKA | A-version: WDO deasserts immediately upon VCC recovery (no timeout delay); standard version latches WDO low until WDI toggle | Better suited for systems requiring rapid watchdog recovery after transient undervoltage, e.g., real-time motion controllers | Select MAX6705AKA if immediate WDO release on VCC restoration is required; otherwise MAX6705ZKA provides stricter fault containment |
| TPS3808G33DBVR | TI part: 3.3V fixed threshold, 200ms reset timeout, no PFI/PFO, no watchdog output - simpler function set | Limited to single-rail 3.3V supervision; lacks power-fail warning and independent watchdog, unsuitable for dual-rail monitoring | Choose TPS3808G33DBVR only for cost-sensitive 3.3V-only designs where PFI/PFO and WDO are unnecessary |
Compared with MAX6705AKA and TPS3808G33DBVR, the MAX6705ZKA uniquely combines Z-suffix 2.32V precision threshold, integrated PFI/PFO for secondary rail monitoring, and independent WDO - making it optimal for compact, multi-rail embedded systems demanding full supervision capability in SOT23-8.
Availability
MAX6705ZKA is available at Aetrix Electronics and suitable for automotive engine control units, industrial PLC I/O modules, and smart energy meters requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6705ZKA 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 was engineered specifically for reliable, low-power microprocessor supervision in space-constrained, thermally harsh environments-emphasizing precision threshold accuracy, glitch immunity, and integrated power-fail warning.
FAQ
What is the exact reset threshold voltage for MAX6705ZKA?
The MAX6705ZKA has a factory-trimmed reset threshold of 2.32V (Z-suffix), with ±3% tolerance over -40°C to +125°C. This value is specified in the Electrical Characteristics table under "VCC Reset Threshold (VCC falling)" and applies to the primary VCC monitor. The 0.62V power-fail comparator threshold is separate and used for PFI input sensing.
Does MAX6705ZKA support manual reset functionality?
Yes, the MAX6705ZKA includes an active-low manual reset input (MR) on Pin 1, with an internal 50kΩ pullup to VCC. Pulling MR low forces a reset pulse for the full timeout period (140–300ms), and the reset remains active as long as MR is held low. This allows pushbutton-initiated reset or external logic control without additional components.
How does the watchdog timer in MAX6705ZKA operate?
The MAX6705ZKA watchdog timer has a nominal timeout of 1.6s. It clears on any rising or falling edge at WDI (Pin 6) and asserts WDO (Pin 8) low if no edge occurs within the timeout window. WDO deasserts immediately upon a valid WDI transition. Unlike MAX6704, MAX6705ZKA provides an independent WDO output not tied to the main RESET signal.
Can MAX6705ZKA monitor voltages other than VCC?
Yes, the MAX6705ZKA features a dedicated power-fail input (PFI, Pin 4) with a 0.62V internal reference. By connecting PFI to a resistor divider from a secondary supply (e.g., 5V or 3.3V rail), users can configure early-warning detection at any voltage above ~0.65V. The corresponding PFO output (Pin 5) signals the condition as an active-low open-drain interrupt.
What package type and dimensions does MAX6705ZKA use?
The MAX6705ZKA uses an 8-pin SOT23-8 package (JEDEC MO-178 BA variant), measuring 3.00mm × 1.75mm × 1.30mm with 0.65mm pitch. Pin 1 is marked by a dot; the package supports both leaded and lead-free assembly (replace "-T" with "+T" for RoHS-compliant ordering). Thermal performance is rated for 714mW dissipation at +70°C.
MAX6705ZKA 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 Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-8
MAX6705ZKA FAQ
1.How can I place an order for MAX6705ZKA through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6705ZKA 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 MAX6705ZKA reliable?
The price and inventory of MAX6705ZKA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6705ZKA is usually 5 days.
3.What payment methods are accepted for MAX6705ZKA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6705ZKA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6705ZKA?
MAX6705ZKA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6705ZKA 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 MAX6705ZKA?
For technical support, including MAX6705ZKA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6705ZKA requirements.
6.How does Aetrix verify that MAX6705ZKA is sourced from the original manufacturer or authorized distributors?
All MAX6705ZKA 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 MAX6705ZKA meets industry standards.
7.What is the process for return or replacement of MAX6705ZKA?
All MAX6705ZKA units undergo pre-shipment inspection (PSI). If there is an issue with MAX6705ZKA, 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 MAX6705ZKA part is unused and in its original packaging.
Return procedure for MAX6705ZKA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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