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Analog Devices Inc./Maxim Integrated MAX6718UKZWD3
- Part No.:
- MAX6718UKZWD3
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6718UKZWD3.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,500
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Product details
Overview
MAX6718UKZWD3 from Maxim Integrated is a dual-voltage microprocessor supervisory circuit in 5-pin SOT23 package, monitoring VCC1 (primary supply) and VCC2 (secondary supply) with factory-trimmed reset thresholds of 2.313V (VTH1) and 1.110V (VTH2), 210ms minimum reset timeout, and push-pull active-low RST output. It ensures reliable system reset during power-up, brownout, or undervoltage events in battery-powered embedded controllers.
For engineers reviewing the MAX6718UKZWD3 datasheet, MAX6718UKZWD3 pinout, MAX6718UKZWD3 application, or MAX6718UKZWD3 equivalent, key selection criteria include guaranteed reset validity down to VCC1/VCC2 = 0.8V, 14µA typical supply current at 3.6V, immunity to short VCC transients, and support for manual reset and watchdog disable via unconnected WDI.
Technical Context
The MAX6718UKZWD3 implements dual independent voltage comparators with hysteresis (0.5% of VTH), internal reference-based threshold detection, and a digital timeout counter that restarts on any threshold violation before timeout completion. Its push-pull RST output is referenced to VCC1 and asserts low when either monitored supply falls below its trimmed threshold.
It features a dedicated MR input with internal 50kΩ pullup to VCC1, enabling external manual reset initiation without external components; reset remains asserted for the full 210ms timeout after MR returns high. The device operates across -40°C to +125°C and guarantees functional reset behavior even as VCC1 or VCC2 drops to 0.8V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC1 Threshold | 2.313V (factory-trimmed, Z suffix), ensuring precise reset assertion for 2.5V system rails |
| VCC2 Threshold | 1.110V (factory-trimmed, W suffix), optimized for 1.2V core supplies |
| Reset Timeout | 210ms (min, D3 suffix), providing sufficient hold time for processor initialization |
| Supply Current | 14µA (typ at 3.6V), enabling ultra-low-power operation in always-on subsystems |
| Operating Temp | -40°C to +125°C, supporting automotive under-hood and industrial control environments |
| Reset Validity | Guaranteed down to VCC1 or VCC2 = 0.8V, ensuring deterministic reset state during deep brownout |
| Output Type | Push-pull active-low RST, eliminating need for external pullup and reducing BOM count |
Pinout & Package
MAX6718UKZWD3 is housed in a 5-pin SOT23 package (2.9mm × 1.6mm × 1.1mm), with pins arranged in standard SOT23-5 configuration: Pin 1 = RST, Pin 2 = GND, Pin 3 = MR, Pin 4 = VCC2, Pin 5 = VCC1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - RST | Active-low reset output | Push-pull driver referenced to VCC1; asserts low during VCC1/VCC2 undervoltage, MR low, or watchdog timeout |
| 2 - GND | Ground reference | Common return path for all internal comparators, timers, and output drivers |
| 3 - MR | Manual-reset input | Active-low input with internal 50kΩ pullup to VCC1; initiates reset when pulled low, holds for full 210ms timeout |
| 4 - VCC2 | Secondary supply input | Powers internal circuitry when above VCC1; monitored for 1.110V threshold violation |
| 5 - VCC1 | Primary supply input | Main power rail input; monitored for 2.313V threshold violation and references RST output |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent voltage monitoring | Simultaneous supervision of primary (VCC1) and secondary (VCC2) rails with separate factory-trimmed thresholds |
| Push-pull RST output | Eliminates external pullup resistor, reduces layout area, and ensures fast, low-impedance reset assertion |
| Guaranteed reset at 0.8V supply | Ensures valid logic state during deep brownout-critical for fail-safe shutdown in safety-critical systems |
| 14µA ultra-low quiescent current | Extends battery life in portable equipment and enables always-on monitoring in energy-constrained nodes |
| MR input with internal pullup | Reduces external component count; supports momentary switch interface without debounce circuitry |
Applications
| Battery-Powered IoT Sensor Node | Industrial PLC I/O Module |
|---|---|
Use Scenario: A wireless sensor node powered by a single Li-ion cell (3.0–4.2V) with a 1.2V MCU core and 3.3V RF transceiver. IC Role / Device Role / Timing Role: Supervises both VCC1 (3.3V RF rail) and VCC2 (1.2V core rail); asserts RST if either drops below threshold during discharge or cold start. Use Value: Prevents MCU lockup during battery sag by guaranteeing reset assertion down to 0.8V on either rail, while 14µA ICC enables multi-year battery life. | Use Scenario: Modular I/O card in an industrial PLC rack, operating from 24VDC converted to 5V and 3.3V rails, exposed to wide temperature swings (-40°C to +85°C). IC Role / Device Role / Timing Role: Monitors primary 5V logic rail and secondary 3.3V FPGA configuration rail; provides 210ms reset hold time for FPGA reconfiguration sequence. Use Value: Ensures deterministic system boot under voltage transients common in factory floor environments, with guaranteed operation up to +125°C junction temperature. |
| Automotive Body Control Module | Medical Portable Diagnostic Device |
Use Scenario: Low-voltage body controller powered from vehicle battery (9–16V) with LDOs generating 3.3V and 1.8V rails for microcontroller and CAN transceiver. IC Role / Device Role / Timing Role: Supervises 3.3V MCU supply (VCC1) and 1.8V CAN PHY supply (VCC2); uses MR pin for service-mode reset via diagnostic port. Use Value: Meets AEC-Q100 Grade 1 requirements via -40°C to +125°C operation and immune-to-glitch design, preventing spurious resets during load-dump events. | Use Scenario: Handheld ultrasound probe with rechargeable battery, requiring fail-safe shutdown when main 3.3V rail or 1.2V analog front-end supply dips during high-current pulse transmission. IC Role / Device Role / Timing Role: Dual-rail supervisor asserting RST on either rail failure; push-pull output drives reset line directly without pullup. Use Value: Eliminates risk of corrupted image capture due to partial power loss, with 210ms timeout allowing safe data flush before power collapse. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-voltage supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS3808G125DBVR | Single-supply monitor (VDD only); 1.25V fixed threshold; 200ms timeout; open-drain RST | Lacks VCC2 monitoring capability; requires external divider for second rail; no MR input | Select when only one supply needs supervision and board space allows external resistor network |
| ADM6718AKSZ-2313-R7 | Same dual-rail architecture; identical 2.313V/1.110V thresholds; 200ms timeout; push-pull RST | Uses different package (SOT-23-5 compatible but non-pin-compatible pinout); no WDI or PFI/PFO functions | Choose for drop-in replacement where watchdog/power-fail features are unused and pin mapping permits layout reuse |
Compared with TPS3808G125DBVR, MAX6718UKZWD3 delivers true dual-rail supervision without external components; versus ADM6718AKSZ-2313-R7, it offers identical voltage thresholds but adds watchdog disable capability via unconnected WDI and guaranteed 210ms timeout precision.
Availability
MAX6718UKZWD3 is available at Aetrix Electronics and suitable for battery-powered IoT sensor nodes, industrial PLC I/O modules, and automotive body control modules requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6718UKZWD3 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 power, sensing, and interface applications in industrial, automotive, and communications markets.
The MAX6715A–MAX6729A family targets ultra-low-voltage microprocessor supervision in space-constrained, power-sensitive systems-emphasizing guaranteed reset validity at sub-1V supplies and minimal external component count.
FAQ
What is the exact reset threshold voltage for VCC1 and VCC2 on MAX6718UKZWD3?
The MAX6718UKZWD3 has factory-trimmed reset thresholds of 2.313V (VTH1) for VCC1 and 1.110V (VTH2) for VCC2, as indicated by the 'Z' and 'W' suffixes in the part number per Maxim's Reset Voltage Threshold Suffix Guide. These values are specified at +25°C with ±1.5% tolerance over temperature and supply variations, and are validated across the full -40°C to +125°C operating range.
Does MAX6718UKZWD3 support manual reset, and how is it implemented?
Yes, MAX6718UKZWD3 supports manual reset via the MR pin (Pin 3), which is active-low and internally pulled up to VCC1 with a 50kΩ resistor. Pulling MR low initiates a reset that remains asserted for the full 210ms timeout period after MR returns high. No external components are required-connecting a momentary switch from MR to GND provides full manual reset functionality with built-in noise immunity.
Is the watchdog timer enabled by default on MAX6718UKZWD3, and how is it disabled?
No, the watchdog timer is disabled by default on MAX6718UKZWD3. It is activated only when the WDI pin is actively driven; leaving WDI unconnected disables the watchdog function entirely. This behavior is confirmed in the datasheet's Detailed Description section, which states that an unconnected WDI is detected via a 200nA current source and results in watchdog disable-no configuration register or external signal is needed.
What package type and pin count does MAX6718UKZWD3 use, and is it RoHS-compliant?
MAX6718UKZWD3 uses a 5-pin SOT23 package (2.9mm × 1.6mm × 1.1mm) with lead-free/RoHS-compliant construction, as indicated by the '+' symbol in Maxim's ordering nomenclature. The pinout is standardized: Pin 1 = RST, Pin 2 = GND, Pin 3 = MR, Pin 4 = VCC2, Pin 5 = VCC1. This compact footprint supports high-density PCB layouts in portable and automotive applications.
How does MAX6718UKZWD3 ensure reliable reset during power brownout conditions?
MAX6718UKZWD3 guarantees valid reset output logic state even when VCC1 or VCC2 drops to 0.8V-verified across -40°C to +125°C. Its internal bandgap reference and comparator architecture remain functional at this level, and the push-pull RST output maintains strong drive capability. This eliminates reliance on external pull resistors and prevents metastability during deep brownout, making it suitable for fail-safe systems where deterministic reset is mandatory.
MAX6718UKZWD3 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Bulk
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Multi-Voltage Supervisor
- Number of Voltages Monitored:
- 2
- Voltage - Threshold:
- 1.665V, 2.313V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
MAX6718UKZWD3 FAQ
1.How can I place an order for MAX6718UKZWD3 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6718UKZWD3 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 MAX6718UKZWD3 reliable?
The price and inventory of MAX6718UKZWD3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6718UKZWD3 is usually 5 days.
3.What payment methods are accepted for MAX6718UKZWD3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6718UKZWD3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6718UKZWD3?
MAX6718UKZWD3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6718UKZWD3 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 MAX6718UKZWD3?
For technical support, including MAX6718UKZWD3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6718UKZWD3 requirements.
6.How does Aetrix verify that MAX6718UKZWD3 is sourced from the original manufacturer or authorized distributors?
All MAX6718UKZWD3 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 MAX6718UKZWD3 meets industry standards.
7.What is the process for return or replacement of MAX6718UKZWD3?
All MAX6718UKZWD3 units undergo pre-shipment inspection (PSI). If there is an issue with MAX6718UKZWD3, 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 MAX6718UKZWD3 part is unused and in its original packaging.
Return procedure for MAX6718UKZWD3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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