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Analog Devices Inc./Maxim Integrated MAX6718AUKSDD3+T
- Part No.:
- MAX6718AUKSDD3+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6718AUKSDD3+T.pdf
- Description:
- IC SUPERVISOR MPU SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:4,014
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Product details
Overview
MAX6718AUKSDD3+T from Maxim Integrated is a dual-supply ultra-low-voltage microprocessor supervisory circuit in SOT23-6 package, monitoring VCC1 (primary) and VCC2 (secondary) supplies with factory-trimmed reset thresholds of 4.625V (VTH1) and 3.075V (VTH2), 280ms minimum reset timeout, push-pull active-low RST output, and guaranteed reset validity down to VCC1 or VCC2 = 0.8V. It supports telecom power systems requiring reliable brownout detection and controlled reset assertion.
For engineers reviewing the MAX6718AUKSDD3+T datasheet, MAX6718AUKSDD3+T pinout, MAX6718AUKSDD3+T application, or MAX6718AUKSDD3+T equivalent, key selection considerations include its dual-voltage monitoring capability, 280ms reset timeout (D5 suffix), push-pull RST output referenced to VCC1, manual-reset input with internal 50kΩ pullup, and operation across –40°C to +125°C industrial temperature range.
Technical Context
The MAX6718AUKSDD3+T integrates two independent voltage comparators with precision internal references (VTH1 = 4.625V ±125mV, VTH2 = 3.075V ±75mV), a 280ms reset timeout timer, and push-pull reset driver referenced to VCC1. Its reset logic asserts RST low when either supply falls below threshold and holds for the full timeout after recovery.
It features a manual-reset input (MR) with 1µs minimum pulse width and 200ns MR-to-RST delay, operates with supply current as low as 10µA (typ) at 3.6V, and maintains valid reset state even when VCC1 or VCC2 drops to 0.8V - enabling robust operation during deep brownouts.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC1 Reset Threshold | 4.625V (typ), ±125mV tolerance - ensures reliable detection of 5V rail collapse before critical logic failure |
| VCC2 Reset Threshold | 3.075V (typ), ±75mV tolerance - precisely monitors 3.3V auxiliary rails in multivoltage systems |
| Reset Timeout Period | 280ms (min), D5 suffix - provides sufficient hold time for full μP initialization and peripheral stabilization |
| Supply Current | 10µA (typ) at 3.6V - enables use in battery-backed or always-on monitoring circuits without significant drain |
| Operating Temperature | –40°C to +125°C - qualified for under-hood automotive, industrial control, and telecom base station environments |
| Reset Output Type | Push-pull, active-low RST referenced to VCC1 - eliminates need for external pullup and ensures clean, fast rise/fall edges |
| MR Input Pullup | 50kΩ internal resistor to VCC1 - simplifies manual-reset implementation with momentary switch to GND only |
Pinout & Package
SOT23-6 package (package code U6+1), 1.6mm × 2.9mm footprint, 0.95mm height, thermal resistance θJA = 115°C/W (multilayer board).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - RST/RST1 | Active-low reset output | Push-pull driver referenced to VCC1; asserts low on VCC1/VCC2 undervoltage, MR low, or watchdog timeout; holds for 280ms after recovery |
| 2 - GND | Ground reference | Common return path for all internal comparators, timers, and output drivers; must be low-impedance connection |
| 3 - MR | Manual-reset input | Active-low input with internal 50kΩ pullup to VCC1; 1µs minimum pulse width; resets system on falling edge |
| 4 - VCC2 | Secondary supply input | Powers internal circuitry when VCC2 > VCC1; input for secondary voltage monitor (VTH2 = 3.075V) |
| 5 - VCC1 | Primary supply input | Main power source and primary voltage monitor input (VTH1 = 4.625V); powers RST output driver |
| 6 - WDI | Watchdog input | Disables watchdog when left floating (200nA unconnected-state detector); accepts CMOS-level transitions to reset timer |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent voltage monitoring | Simultaneous supervision of VCC1 (4.625V) and VCC2 (3.075V) with separate comparators and hysteresis - prevents false resets from correlated supply noise |
| Guaranteed reset validity to 0.8V | Functional reset assertion and release guaranteed even when VCC1 or VCC2 drops to 0.8V - supports deep brownout recovery in safety-critical systems |
| 280ms minimum reset timeout | Ensures μP and peripherals fully initialize before release; immune to restart loops caused by insufficient hold time |
| Push-pull RST output | Eliminates external pullup resistor, reduces BOM count, improves rise/fall time (<200ns), and avoids weak-drive issues in noisy environments |
| Low 10µA supply current | Enables permanent installation in always-on subsystems (e.g., RTC backup, modem wake logic) without measurable battery load |
Applications
| Telecom Power Management | Industrial PLC I/O Modules |
|---|---|
|
Use Scenario: Monitoring redundant 5V/3.3V DC-DC outputs in LTE base station power distribution units. IC Role / Device Role / Timing Role: Dual-supply supervisor asserting synchronized reset to FPGA and baseband processor upon any rail collapse. Use Value: Prevents partial initialization and metastability by enforcing 280ms reset hold time across both voltage domains. |
Use Scenario: Ensuring deterministic startup of analog I/O conditioning circuits and isolated CAN transceivers in programmable logic controllers. IC Role / Device Role / Timing Role: Supervising primary 5V logic rail and secondary 3.3V sensor interface rail with push-pull RST driving optocoupled reset tree. Use Value: Guarantees reset validity down to 0.8V during brownout conditions common in factory floor power grids. |
| Server BMC Power Sequencing | Automotive Infotainment Head Units |
|
Use Scenario: Coordinating power-up sequence between BMC SoC (1.8V core) and management PHY (3.3V I/O) in rack server management controllers. IC Role / Device Role / Timing Role: Monitoring VCC1 (5V aux) and VCC2 (3.3V) to generate timed reset pulse for BMC boot ROM enable. Use Value: Factory-trimmed thresholds eliminate calibration overhead; 280ms timeout aligns with BMC firmware handshake timing. |
Use Scenario: Detecting undervoltage on infotainment SoC's 5V main supply and 3.3V display interface rail during vehicle cranking events. IC Role / Device Role / Timing Role: Dual-rail supervisor triggering hard reset of multimedia processor and audio codec when either rail dips below spec. Use Value: –40°C to +125°C rating ensures operation in dashboard-mounted units exposed to extreme ambient temperatures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-supply supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6717AUKSDD3+T | Open-drain RST output instead of push-pull; same thresholds and 280ms timeout | Requires external pullup resistor; suitable where level-shifting or wired-OR reset buses are needed | Select MAX6717AUKSDD3+T only if system architecture mandates open-drain reset signaling or shared reset bus topology |
| TPS3808G33DBVR | Single-supply (3.3V only), 200ms timeout, different pinout (SOT23-6 but non-compatible), no VCC2 monitoring | Lacks dual-voltage capability; cannot replace MAX6718AUKSDD3+T in systems requiring independent 5V/3.3V supervision | Use TPS3808G33DBVR only for single-rail 3.3V applications where cost is prioritized over dual-monitoring functionality |
Compared with MAX6717AUKSDD3+T and TPS3808G33DBVR, the MAX6718AUKSDD3+T uniquely delivers push-pull reset drive, guaranteed 0.8V operation, and true dual-rail supervision - making it irreplaceable in high-reliability multivoltage systems where reset integrity and layout simplicity are critical.
Availability
MAX6718AUKSDD3+T is available at Aetrix Electronics and suitable for telecom infrastructure, industrial PLCs, and automotive infotainment systems requiring stable component supply, long-term lifecycle support, and AEC-Q100-aligned reliability.
Supply support for MAX6718AUKSDD3+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 demanding industrial, automotive, and communications applications, with emphasis on power management, sensing, and reliability.
The MAX6715A–MAX6729A family was engineered specifically for multivoltage microprocessor systems needing compact, accurate, and fail-safe power supervision across extended temperature ranges.
FAQ
What is the exact reset timeout period of MAX6718AUKSDD3+T?
The MAX6718AUKSDD3+T has a minimum reset timeout period of 280ms, corresponding to the 'D5' suffix in its part number. This value is guaranteed over the full –40°C to +125°C operating temperature range and is implemented via an internal precision timer that holds RST low for the entire duration after any reset trigger event, including VCC1/VCC2 undervoltage, MR assertion, or watchdog timeout.
Does MAX6718AUKSDD3+T support monitoring a third voltage rail?
No, MAX6718AUKSDD3+T does not support a third monitored voltage. It is a dual-supply supervisor with dedicated VCC1 and VCC2 inputs only. Models like MAX6719A/MAX6720A include the RSTIN pin for adjustable third-rail monitoring, but MAX6718AUKSDD3+T lacks this pin and associated internal comparator circuitry per its SOT23-6 pinout and functional description.
What is the function of the WDI pin on MAX6718AUKSDD3+T?
The WDI (Watchdog Input) pin on MAX6718AUKSDD3+T is unused and internally disabled. Unlike MAX6721A–MAX6729A variants, the MAX6718AUKSDD3+T does not incorporate watchdog functionality - confirmed by its absence in the Pin Description table for MAX6717A/MAX6718A and omission from all watchdog-related electrical characteristics. Leaving WDI unconnected has no effect on operation.
Can MAX6718AUKSDD3+T operate with VCC1 = 3.3V and VCC2 = 1.8V?
Yes, MAX6718AUKSDD3+T supports VCC1 from 0.8V to 5.5V and VCC2 from 0.8V to 5.5V independently. However, its factory-trimmed thresholds are fixed at 4.625V (VTH1) and 3.075V (VTH2), so using it with 3.3V/1.8V rails would result in continuous reset assertion since both supplies fall below their respective thresholds. It is intended for 5V/3.3V systems, not lower-voltage combinations.
Is MAX6718AUKSDD3+T RoHS compliant and lead-free?
Yes, MAX6718AUKSDD3+T is RoHS compliant and lead-free. The '+' character in its package code 'U6+1' explicitly indicates RoHS-compliant packaging per Maxim Integrated's package coding convention, and the device meets JEDEC J-STD-020 moisture sensitivity level 1 requirements for reflow soldering.
MAX6718AUKSDD3+T 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:
- 0.788V, 2.925V
- 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-23-5
MAX6718AUKSDD3+T FAQ
1.How can I place an order for MAX6718AUKSDD3+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6718AUKSDD3+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 MAX6718AUKSDD3+T reliable?
The price and inventory of MAX6718AUKSDD3+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6718AUKSDD3+T is usually 5 days.
3.What payment methods are accepted for MAX6718AUKSDD3+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6718AUKSDD3+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6718AUKSDD3+T?
MAX6718AUKSDD3+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6718AUKSDD3+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 MAX6718AUKSDD3+T?
For technical support, including MAX6718AUKSDD3+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6718AUKSDD3+T requirements.
6.How does Aetrix verify that MAX6718AUKSDD3+T is sourced from the original manufacturer or authorized distributors?
All MAX6718AUKSDD3+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 MAX6718AUKSDD3+T meets industry standards.
7.What is the process for return or replacement of MAX6718AUKSDD3+T?
All MAX6718AUKSDD3+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6718AUKSDD3+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 MAX6718AUKSDD3+T part is unused and in its original packaging.
Return procedure for MAX6718AUKSDD3+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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