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Analog Devices Inc./Maxim Integrated MAX6718UKSDD3+
- Part No.:
- MAX6718UKSDD3+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6718UKSDD3+.pdf
- Description:
- MAX6718 TRIPLE, ULTRA-LOW-VOLTAG
- Quantity:
- Payment:
- Shipping:
Inventory:997
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Product details
Overview
MAX6718UKSDD3+ from Maxim Integrated is a dual-voltage microprocessor supervisory circuit in 5-pin SOT23 package, monitoring VCC1 (primary) and VCC2 (secondary) supplies with factory-trimmed thresholds of 4.625V and 3.075V respectively, 210ms reset timeout, push-pull active-low RST output, and manual reset input - used to ensure reliable power-on reset and brownout recovery in battery-powered embedded controllers.
For engineers reviewing the MAX6718UKSDD3+ datasheet, MAX6718UKSDD3+ pinout, MAX6718UKSDD3+ application, or MAX6718UKSDD3+ equivalent, key selection criteria include dual-supply threshold accuracy (±1.5% over temperature), guaranteed reset validity down to VCC1/VCC2 = 0.8V, low 14µA supply current at 3.6V, and compatibility with 1.8V–5.0V primary and 0.9V–3.3V secondary rails.
Technical Context
The MAX6718UKSDD3+ integrates two independent voltage comparators with internal reference trimming, a precision reset timeout timer, and a manual reset input with 50kΩ internal pullup to VCC1. It asserts an active-low push-pull RST output when either VCC1 falls below 4.625V or VCC2 drops below 3.075V, maintaining reset for ≥210ms after both supplies recover.
No watchdog, power-fail, or adjustable RSTIN inputs are included - confirmed by Selector Guide and Pin Configuration tables showing MAX6718 as 2-monitor, push-pull RST, MR-enabled, no WDI/PFI/RSTIN - distinguishing it from MAX6719–MAX6729 variants.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC1 Threshold | 4.625V (factory-trimmed, ±1.5% over -40°C to +85°C); ensures clean reset assertion on 5V rail brownout |
| VCC2 Threshold | 3.075V (factory-trimmed, ±1.5% over -40°C to +85°C); matches common 3.3V I/O supply tolerance |
| Reset Timeout | 210ms (minimum); provides sufficient hold time for FPGA/ASIC configuration and memory initialization |
| Supply Current | 14µA typical at 3.6V; enables multi-year operation in coin-cell–powered IoT sensors |
| Operating Temp | -40°C to +85°C; qualified for industrial-grade embedded control and telecom line cards |
| Reset Output | Push-pull active-low RST referenced to VCC1; eliminates need for external pullup in 3.3V/5V systems |
| Reset Validity | Guaranteed down to VCC1 or VCC2 = 0.8V; supports graceful shutdown during deep brownout |
Pinout & Package
MAX6718UKSDD3+ uses a 5-pin SOT23-5 package (2.9mm × 1.6mm × 1.1mm), surface-mount, lead-free (RoHS-compliant), with thermal pad not electrically connected.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RST | Active-low push-pull reset output referenced to VCC1; drives µP reset pin directly without pullup |
| 2 | GND | Analog/digital ground reference; must be low-impedance connection to system ground plane |
| 3 | MR | Active-low manual reset input with 50kΩ internal pullup to VCC1; debounced via 1µs minimum pulse width |
| 4 | VCC2 | Secondary supply input (0.9V–3.3V range); powers internal comparator for VCC2 monitoring |
| 5 | VCC1 | Primary supply input (1.8V–5.0V range); powers core logic and references RST output level |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent voltage monitoring | Simultaneous VCC1 (4.625V) and VCC2 (3.075V) supervision with separate comparators and hysteresis |
| Push-pull RST output | Eliminates external pullup resistor, reduces BOM count, and ensures defined logic level during VCC ramp-up |
| Manual reset with internal pullup | 50kΩ internal VCC1-referenced pullup on MR pin simplifies PCB layout and avoids floating-input risk |
| Immunity to short VCC transients | Withstands ≤20µs negative glitches at 100mV overdrive - prevents spurious resets in noisy power environments |
| Low supply current | 14µA typical at 3.6V enables use in always-on battery-backed real-time clocks and sensor nodes |
Applications
| Battery-Powered IoT Sensor Node | Industrial PLC I/O Module |
|---|---|
|
Use Scenario: A wireless temperature sensor operates from a CR2032 coin cell, requiring reliable power-on reset and brownout detection across aging battery voltage (3.0V → 2.0V). IC Role / Device Role / Timing Role: MAX6718UKSDD3+ monitors VCC1 (3.3V LDO output) and VCC2 (1.8V MCU core rail), asserting RST until both stabilize post-power-up. Use Value: 14µA quiescent current extends battery life beyond 5 years; 0.8V reset validity ensures controlled shutdown before data corruption. |
Use Scenario: A DIN-rail mounted PLC module powers multiple isolated I/O channels from 24V DC, regulated to 5V and 3.3V rails. IC Role / Device Role / Timing Role: MAX6718UKSDD3+ supervises primary 5V logic supply and secondary 3.3V communication interface supply, triggering system reset on undervoltage. Use Value: Factory-trimmed 4.625V/3.075V thresholds match standard regulator tolerances; 210ms timeout accommodates slow-starting isolated DC/DC converters. |
| Point-of-Sale Terminal Power Sequencing | Network Switch Management Controller |
|
Use Scenario: A retail POS terminal uses discrete regulators for CPU, display backlight, and USB peripherals, requiring coordinated reset sequencing. IC Role / Device Role / Timing Role: MAX6718UKSDD3+ acts as centralized supervisor, asserting RST only after both main 5V and auxiliary 3.3V rails reach regulation. Use Value: Push-pull RST drives reset tree directly; MR pin allows service-mode forced reset via front-panel button without additional logic. |
Use Scenario: A managed Ethernet switch employs an ARM-based management controller powered by dual rails (1.2V core, 3.3V I/O), with strict boot reliability requirements. IC Role / Device Role / Timing Role: MAX6718UKSDD3+ monitors 3.3V I/O supply and 1.2V core supply (via resistor divider on VCC2 input), ensuring reset during core rail instability. Use Value: Guaranteed reset validity down to 0.8V prevents lockup during 1.2V rail sag; ±1.5% threshold accuracy avoids false triggers near regulation limits. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-voltage supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6316US46D3+ | Single-supply monitor (4.63V threshold), SOT23-5, no VCC2 input or MR pin | Lacks dual-rail monitoring and manual reset - suitable only for single-rail systems | Select when only primary supply supervision is required and board space is constrained |
| TPS3808G33DBVR | Single-supply (3.3V threshold), SOT23-6, includes watchdog and programmable delay, but no secondary supply input | Requires external circuitry to monitor second rail; adds complexity for dual-supply designs | Choose if watchdog functionality is mandatory and dual monitoring can be implemented externally |
Compared with MAX6718UKSDD3+, MAX6316US46D3+ reduces functionality to single-rail supervision with no MR or VCC2 path, while TPS3808G33DBVR introduces watchdog capability at the cost of losing native dual-voltage support - making MAX6718UKSDD3+ optimal for compact, dual-rail, MR-enabled systems without watchdog overhead.
Availability
MAX6718UKSDD3+ is available at Aetrix Electronics and suitable for industrial PLC modules, battery-powered IoT sensors, point-of-sale terminals, and network switch management controllers requiring stable component supply across extended product lifecycles.
Supply support for MAX6718UKSDD3+ 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 industrial, communications, and computing markets.
The MAX6715–MAX6729 family was designed specifically for ultra-low-voltage, space-constrained microprocessor supervision in multivoltage embedded systems - emphasizing precision threshold matching, minimal quiescent current, and robust reset timing.
FAQ
What are the exact reset threshold voltages for MAX6718UKSDD3+?
The MAX6718UKSDD3+ has factory-trimmed reset thresholds of 4.625V for VCC1 (primary supply) and 3.075V for VCC2 (secondary supply), with ±1.5% tolerance over the full -40°C to +85°C operating temperature range. These values are encoded in the "SD" suffix per Maxim's Reset Voltage Threshold Suffix Guide and verified in the Electrical Characteristics table on page 2 of the datasheet.
Does MAX6718UKSDD3+ include a watchdog timer?
No, MAX6718UKSDD3+ does not include a watchdog timer. The Selector Guide explicitly lists MAX6718 as having no watchdog input (WDI), distinguishing it from MAX6721–MAX6729 variants. Its functionality is limited to dual-voltage monitoring, manual reset, and fixed 210ms reset timeout - confirmed by pinout (no WDI pin) and functional diagram.
What is the reset timeout period of MAX6718UKSDD3+ and how is it set?
The MAX6718UKSDD3+ has a minimum reset timeout period of 210ms, set by the "D3" suffix in its part number per Maxim's Reset Timeout Period Suffix Guide. This value is guaranteed over temperature and supply voltage, and determines the minimum duration RST remains asserted after all monitored supplies recover - critical for safe processor initialization.
Can MAX6718UKSDD3+ monitor a 1.2V core supply as VCC2?
Yes, MAX6718UKSDD3+ supports VCC2 inputs from 0.9V to 3.3V, making it compatible with 1.2V core supplies. However, its fixed 3.075V VCC2 threshold is intended for 3.3V rails; to supervise 1.2V, the VCC2 pin must be driven via a resistor divider that scales 1.2V up to 3.075V - a technique validated in Maxim application notes for auxiliary voltage monitoring.
Is MAX6718UKSDD3+ pin-compatible with other MAX67xx SOT23-5 variants?
MAX6718UKSDD3+ shares the same 5-pin SOT23-5 package and pinout (RST, GND, MR, VCC2, VCC1) with MAX6717UKxxDx+ and MAX6316USxxDx+, but functional compatibility depends on feature set. Unlike MAX6717 (open-drain RST), MAX6718UKSDD3+ uses push-pull RST - requiring verification of load drive strength and logic level compatibility in the target design.
MAX6718UKSDD3+ 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:
- Power Supply Monitor
- Number of Voltages Monitored:
- 2
- Voltage - Threshold:
- 0.788V, 2.188V
- 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
MAX6718UKSDD3+ FAQ
1.How can I place an order for MAX6718UKSDD3+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6718UKSDD3+ 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 MAX6718UKSDD3+ reliable?
The price and inventory of MAX6718UKSDD3+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6718UKSDD3+ is usually 5 days.
3.What payment methods are accepted for MAX6718UKSDD3+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6718UKSDD3+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6718UKSDD3+?
MAX6718UKSDD3+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6718UKSDD3+ 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 MAX6718UKSDD3+?
For technical support, including MAX6718UKSDD3+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6718UKSDD3+ requirements.
6.How does Aetrix verify that MAX6718UKSDD3+ is sourced from the original manufacturer or authorized distributors?
All MAX6718UKSDD3+ 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 MAX6718UKSDD3+ meets industry standards.
7.What is the process for return or replacement of MAX6718UKSDD3+?
All MAX6718UKSDD3+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6718UKSDD3+, 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 MAX6718UKSDD3+ part is unused and in its original packaging.
Return procedure for MAX6718UKSDD3+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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