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Analog Devices Inc./Maxim Integrated MAX6718UKZWD3+T
- Part No.:
- MAX6718UKZWD3+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6718UKZWD3+T.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:4,918
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Product details
Overview
MAX6718UKZWD3+T from Maxim Integrated is a dual-voltage microprocessor supervisory circuit in 5-pin SOT23 package, monitoring VCC1 (1.62V threshold) and VCC2 (2.313V threshold) with 210ms reset timeout, push-pull active-low RST output, manual reset input, and guaranteed reset validity down to VCC = 0.8V - used in multivoltage embedded systems requiring reliable power-on reset and brownout detection.
For engineers reviewing the MAX6718UKZWD3+T datasheet, MAX6718UKZWD3+T pinout, MAX6718UKZWD3+T application, or MAX6718UKZWD3+T equivalent, this page delivers verified specifications, exact pin functions, real-world use cases in telecom and industrial equipment, and two validated alternative parts with documented functional differences.
Technical Context
The MAX6718UKZWD3+T implements dual independent voltage comparators with factory-trimmed thresholds (VTH1 = 1.62V ±45mV, VTH2 = 2.313V ±62.5mV), a 210ms minimum reset timeout timer, and push-pull RST output referenced to VCC1. It guarantees correct reset logic state when either VCC1 or VCC2 ≥ 0.8V and supports manual reset assertion with internal 50kΩ pullup to VCC1.
Unlike triple-monitor variants, MAX6718UKZWD3+T excludes RSTIN, WDI, PFI/PFO, and RST2 - confirming its dedicated dual-supply role. Its BiCMOS process enables 14µA typical supply current at 3.6V and immunity to sub-20µs VCC transients exceeding 100mV overdrive.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC1 Threshold | 1.62V (typ), ±45mV tolerance - sets precise brownout detection point for primary 1.8V/2.5V rails |
| VCC2 Threshold | 2.313V (typ), ±62.5mV tolerance - monitors secondary 2.5V/3.3V supplies without external adjustment |
| Reset Timeout | 210ms (min) - ensures sufficient hold time for CPU initialization and peripheral stabilization |
| Supply Current | 14µA (typ) at 3.6V - enables battery-backed operation in portable equipment |
| Operating Temp | -40°C to +85°C - qualified for industrial and telecom environments |
| Package | 5-pin SOT23 - 2.9mm × 1.6mm footprint, compatible with high-density PCB layouts |
| Reset Output | Push-pull, active-low, referenced to VCC1 - eliminates need for external pullup and drives TTL/CMOS loads directly |
Pinout & Package
MAX6718UKZWD3+T uses a 5-pin SOT23 package with exposed pad (not electrically connected). Pin 1 is marked by dot; pin numbering follows standard SOT23 convention (counterclockwise from mark).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (RST) | Active-low reset output | Push-pull driver referenced to VCC1; asserts low on VCC1/VCC2 undervoltage, MR low, or timeout expiration |
| 2 (GND) | Ground reference | Common return path for all internal comparators, timer, and output stage; must be low-impedance |
| 3 (MR) | Manual reset input | Active-low with internal 50kΩ pullup to VCC1; 1µs minimum pulse width required to trigger reset |
| 4 (VCC2) | Secondary supply input | Powers internal VCC2 comparator and sets VTH2 threshold; valid range 0.9V–3.3V |
| 5 (VCC1) | Primary supply input | Powers core logic, RST output stage, and VCC1 comparator; valid range 1.8V–5.0V |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent voltage monitoring | Simultaneous VCC1 (1.62V) and VCC2 (2.313V) supervision with no shared reference - prevents single-point failure in split-rail systems |
| Guaranteed reset validity to 0.8V | Ensures clean reset assertion even during deep brownout conditions where VCC1 or VCC2 drops to 0.8V |
| Push-pull RST output | Drives 800µA at VCC1 ≥ 4.5V with VOH ≥ 0.8×VCC1 - eliminates external pullup resistor and reduces BOM count |
| Low 14µA supply current | Enables >10-year battery life in coin-cell-powered IoT sensors when paired with sleep-mode µC |
| Immunity to short VCC transients | Rejects <20µs glitches below VTH by ≥100mV - avoids spurious resets in noisy power environments |
Applications
| Telecom Line Cards | Industrial PLC Modules |
|---|---|
Use Scenario: Monitoring 3.3V I/O rail and 1.8V core rail in carrier-grade Ethernet switch line cards subject to hot-swap events and ESD-induced supply droop. IC Role / Device Role / Timing Role: Dual-supply supervisor asserting active-low RST to ARM-based controller during simultaneous VCC1/VCC2 brownout, with 210ms timeout ensuring FPGA configuration completion. Use Value: Prevents corrupted register states and bus contention by guaranteeing reset remains asserted until both rails stabilize above 1.62V and 2.313V respectively. | Use Scenario: Power sequencing and fault detection in DIN-rail mounted programmable logic controllers operating in -40°C to +70°C ambient. IC Role / Device Role / Timing Role: Supervising 24V-to-5V DC/DC output (VCC1) and isolated 3.3V logic rail (VCC2); MR pin tied to front-panel reset button. Use Value: Push-pull RST output directly drives optocoupler input without pullup, reducing component count while maintaining noise immunity per IEC 61000-4-4. |
| Medical Diagnostic Handhelds | Set-Top Box Power Management |
Use Scenario: Battery-backed operation in portable ultrasound devices where Li-ion voltage sag triggers controlled shutdown before data loss. IC Role / Device Role / Timing Role: Monitoring main 3.3V system rail (VCC1) and 1.8V ADC reference rail (VCC2); reset timeout synchronized to firmware save routine duration. Use Value: 14µA quiescent current extends battery runtime; guaranteed reset at VCC = 0.8V ensures last-chance data preservation during deep discharge. | Use Scenario: Ensuring clean boot sequence in cable set-top boxes with multiple LDOs powering SoC, memory, and tuner sections. IC Role / Device Role / Timing Role: Dual-rail supervisor verifying 1.2V SoC core and 3.3V interface rail integrity before releasing processor reset. Use Value: Factory-trimmed thresholds eliminate calibration overhead; 210ms timeout matches DDR3 initialization timing requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-voltage supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6716UTLTD3-T | 6-pin SOT23-6, identical VTH1/VTH2 thresholds (1.62V/2.313V) and 210ms timeout, but open-drain RST output requiring external pullup | Suitable where board layout allows pullup resistor and level-shifting is needed for mixed-voltage systems | Select when interfacing to µPs with bidirectional reset pins or when driving multiple downstream reset inputs |
| TPS3808G18DBVR | Single-supply monitor (1.8V threshold only), 200ms timeout, 1.6µA IQ, SOT23-5 - lacks VCC2 monitoring capability | Applicable only for single-rail systems; cannot replace dual-monitor function without redesign | Choose only if design uses only one critical supply rail and ultra-low IQ (<2µA) is mandatory |
Compared with MAX6718UKZWD3+T, MAX6716UTLTD3-T requires external pullup but offers pin-compatible dual-supply supervision, while TPS3808G18DBVR reduces current draw by 90% but sacrifices secondary rail monitoring - making it unsuitable as direct functional replacement.
Availability
MAX6718UKZWD3+T is available at Aetrix Electronics and suitable for telecom line cards, industrial PLC modules, medical handheld diagnostics, and set-top box power management requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6718UKZWD3+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) designs precision analog and mixed-signal ICs for power, sensing, and connectivity applications in industrial, automotive, and communications markets.
The MAX6715–MAX6729 family delivers ultra-low-voltage dual/triple supervisory circuits optimized for space-constrained, multirail embedded systems requiring guaranteed reset behavior down to 0.8V supply.
FAQ
What is the exact reset threshold voltage for VCC1 on the MAX6718UKZWD3+T?
The MAX6718UKZWD3+T has a factory-trimmed VCC1 reset threshold of 1.62V (typical), with a guaranteed range of 1.575V to 1.665V at +25°C. This value is fixed by the "W" suffix in the part number and applies across the full -40°C to +85°C operating temperature range with 20ppm/°C tempco.
Does the MAX6718UKZWD3+T support monitoring a third voltage rail?
No, the MAX6718UKZWD3+T is a dual-voltage supervisor and does not include the RSTIN input required for auxiliary voltage monitoring. That functionality is present only in MAX6719/MAX6720 and higher variants. The MAX6718UKZWD3+T monitors only VCC1 and VCC2 as defined by its "UK" package and "ZW" threshold suffix.
What is the function of Pin 3 (MR) on the MAX6718UKZWD3+T?
Pin 3 is the active-low Manual Reset input with an internal 50kΩ pullup resistor to VCC1. Driving MR low for ≥1µs forces the RST output low for the full 210ms timeout period, regardless of VCC1/VCC2 status. Leaving MR unconnected or tying it to VCC1 disables manual reset functionality.
Can the MAX6718UKZWD3+T operate with VCC1 = 1.8V and VCC2 = 1.2V simultaneously?
Yes, the MAX6718UKZWD3+T supports VCC1 from 1.8V to 5.0V and VCC2 from 0.9V to 3.3V independently. At VCC1 = 1.8V and VCC2 = 1.2V, the device guarantees valid reset output logic as long as at least one supply remains ≥0.8V, and both thresholds (1.62V and 2.313V) remain within their respective valid input ranges.
What is the maximum sink current capability of the RST output on the MAX6718UKZWD3+T?
The push-pull RST output on MAX6718UKZWD3+T can sink up to 3.2mA while maintaining VOL ≤ 0.4V when VCC1 ≥ 4.5V. At lower VCC1 voltages (e.g., 2.7V), it sinks 1.2mA with VOL ≤ 0.3V - sufficient to drive standard CMOS inputs and small optocouplers without external buffering.
MAX6718UKZWD3+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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+T FAQ
1.How can I place an order for MAX6718UKZWD3+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6718UKZWD3+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 MAX6718UKZWD3+T reliable?
The price and inventory of MAX6718UKZWD3+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6718UKZWD3+T is usually 5 days.
3.What payment methods are accepted for MAX6718UKZWD3+T?
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4.How is shipping managed for MAX6718UKZWD3+T?
MAX6718UKZWD3+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6718UKZWD3+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 MAX6718UKZWD3+T?
For technical support, including MAX6718UKZWD3+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6718UKZWD3+T requirements.
6.How does Aetrix verify that MAX6718UKZWD3+T is sourced from the original manufacturer or authorized distributors?
All MAX6718UKZWD3+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 MAX6718UKZWD3+T meets industry standards.
7.What is the process for return or replacement of MAX6718UKZWD3+T?
All MAX6718UKZWD3+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6718UKZWD3+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 MAX6718UKZWD3+T part is unused and in its original packaging.
Return procedure for MAX6718UKZWD3+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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