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Analog Devices Inc./Maxim Integrated MAX6718UKSHD3+T
- Part No.:
- MAX6718UKSHD3+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6718UKSHD3+T.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:5,638
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Product details
Overview
MAX6718UKSHD3+T from Maxim Integrated is a dual-voltage microprocessor supervisory circuit in 5-pin SOT23 package, monitoring VCC1 (4.625V threshold) and VCC2 (3.075V threshold) with 210ms reset timeout, push-pull active-low RST output, manual reset input, and guaranteed reset validity down to VCC1 or VCC2 = 0.8V - used in multivoltage embedded systems requiring reliable power-on reset and brownout detection.
For engineers reviewing the MAX6718UKSHD3+T datasheet, MAX6718UKSHD3+T pinout, MAX6718UKSHD3+T application, or MAX6718UKSHD3+T equivalent, key selection criteria include dual-supply threshold accuracy (±1.5% over temperature), ultra-low 14µA supply current at 3.6V, immunity to sub-20µs VCC transients, and compatibility with 1.8V/3.3V core-I/O rail architectures.
Technical Context
The MAX6718UKSHD3+T implements two independent voltage comparators with factory-trimmed thresholds (VTH1 = 4.625V, VTH2 = 3.075V), each referenced to a precision internal bandgap. Its reset logic asserts RST low when either supply falls below its threshold and holds for a guaranteed minimum 210ms after both supplies recover.
It features a push-pull RST output referenced to VCC1, an internal 50kΩ pullup on MR, and operates across -40°C to +85°C with reset threshold tempco of 20ppm/°C. No watchdog, RSTIN, PFI, or PFO functions are included - confirmed by Selector Guide and Pin Configuration tables.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC1 Threshold | 4.625V (factory-trimmed, ±1.5% over -40°C to +85°C) - sets precise brownout detection for 5V or 4.8V primary rails |
| VCC2 Threshold | 3.075V (factory-trimmed, ±1.5% over -40°C to +85°C) - enables reliable monitoring of 3.3V I/O or auxiliary supplies |
| Reset Timeout | 210ms (min) - ensures sufficient hold time for full µP initialization and peripheral stabilization |
| Supply Current | 14µA (typ at 3.6V) - minimizes quiescent load in battery-backed or always-on systems |
| Operating Temp | -40°C to +85°C - qualified for industrial and telecom equipment environments |
| Reset Validity | Down to VCC1 or VCC2 = 0.8V - guarantees correct RST state during deep brownout or power ramp-down |
| VCC Transient Immunity | Immune to <20µs negative glitches - prevents spurious resets from switching noise or ESD-induced dips |
Pinout & Package
Package: 5-pin SOT23-5 (2.9mm × 1.6mm × 1.1mm), surface-mount, lead-free (+T suffix).
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RST | Active-low push-pull reset output referenced to VCC1; sinks up to 3.2mA at VCC1 ≥ 4.5V; no external pullup required |
| 2 | GND | Analog/digital ground reference for all comparators and logic; must be low-impedance connection to system ground plane |
| 3 | MR | Active-low manual reset input with internal 50kΩ pullup to VCC1; accepts TTL/CMOS levels; 1µs minimum pulse width |
| 4 | VCC2 | Secondary supply input (0.9V–3.3V range); powers internal VCC2 comparator and sets VTH2 reference point |
| 5 | VCC1 | Primary supply input (1.8V–5.0V range); powers device core, sets VTH1 reference, and sources RST output |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent voltage monitoring | Simultaneous supervision of primary (VCC1) and secondary (VCC2) rails eliminates need for discrete comparators or dual ICs |
| Factory-trimmed precision thresholds | VTH1 = 4.625V / VTH2 = 3.075V with ±1.5% tolerance over full temperature range - reduces BOM count and calibration effort |
| Push-pull RST output | Eliminates external pullup resistor, simplifies layout, and ensures fast, rail-to-rail reset assertion without leakage path concerns |
| Guaranteed reset validity to 0.8V | Enables robust operation during slow power ramps or deep undervoltage conditions where many supervisors fail |
| Ultra-low 14µA supply current | Extends battery life in portable equipment and reduces self-heating in thermally constrained modules |
Applications
| Industrial PLC Controller | Network Router Power Management |
|---|---|
Use Scenario: Monitoring 5V main power and 3.3V FPGA I/O supply in a DIN-rail mounted programmable logic controller exposed to wide ambient temperature swings. IC Role / Device Role / Timing Role: Dual-supply supervisor ensuring deterministic reset assertion during AC line sags, DC-DC converter faults, or cold-start conditions. Use Value: Prevents firmware corruption by holding µP in reset until both rails stabilize above 4.625V and 3.075V respectively, with 210ms timeout guaranteeing FPGA configuration completion. | Use Scenario: Supervising 5V PoE-powered backplane and 3.3V switch ASIC supply in a managed Ethernet router operating 24/7 in telecom cabinets. IC Role / Device Role / Timing Role: Fault-detection interface between power subsystem and ARM-based control processor, asserting reset on any rail collapse. Use Value: 14µA quiescent current minimizes standby loss; 0.8V reset validity ensures clean reset even during gradual brownout caused by failing upstream DC-DC stage. |
| Medical Point-of-Care Device | Automated Test Equipment (ATE) |
Use Scenario: Ensuring safe startup of a battery-operated ultrasound handheld with separate 3.3V analog front-end and 1.8V digital core supplies. IC Role / Device Role / Timing Role: System-level power integrity guardian that blocks processor execution until both critical rails meet precision thresholds. Use Value: Factory-trimmed 4.625V/3.075V thresholds eliminate calibration; push-pull RST avoids pullup resistor placement in space-constrained PCB layout. | Use Scenario: Providing deterministic reset sequencing for multi-rail test instrumentation with 5V control logic, 3.3V interface, and isolated 12V analog sections. IC Role / Device Role / Timing Role: Primary supervisory element verifying stable power before enabling high-precision DACs, ADCs, and relay drivers. Use Value: Immunity to <20µs VCC transients prevents false resets during relay coil switching or high-speed digital bus activity. |
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 | Same 6-pin SOT23 package, identical VTH1/VTH2 (4.625V/3.075V) and 210ms timeout, but open-drain RST output requiring external pullup | Requires additional 10kΩ pullup resistor and board space; less suitable for high-noise or low-impedance reset buses | Select MAX6716UTLTD3-T only if open-drain flexibility (e.g., wired-OR reset busing) is required and layout allows pullup placement |
| TPS3808G33DBVR | Single-supply supervisor (3.3V threshold only), 200ms timeout, 1.5µA IQ, SOT23-5 - lacks dual-monitoring capability and VCC2 input | Cannot replace MAX6718UKSHD3+T in dual-rail systems without adding second supervisor or redesigning power architecture | Use TPS3808G33DBVR only for single-rail 3.3V applications where cost and ultra-low IQ outweigh dual-monitoring need |
Compared with MAX6716UTLTD3-T, MAX6718UKSHD3+T saves one passive component and improves noise immunity via push-pull drive; compared with TPS3808G33DBVR, it provides essential dual-rail coordination unattainable with single-threshold devices.
Availability
MAX6718UKSHD3+T is available at Aetrix Electronics and suitable for industrial PLC controllers, network router power management, medical point-of-care devices, automated test equipment, and telecom infrastructure requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6718UKSHD3+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, mixed-signal, and power management ICs for demanding industrial, automotive, and communications applications.
The MAX6715–MAX6729 family delivers compact, ultra-low-power supervisory solutions optimized for multivoltage embedded systems where reliability, small footprint, and guaranteed reset behavior under brownout are critical.
FAQ
What is the exact reset threshold voltage for VCC1 and VCC2 on the MAX6718UKSHD3+T?
The MAX6718UKSHD3+T has factory-trimmed reset thresholds of 4.625V for VCC1 and 3.075V for VCC2, as indicated by the "SH" suffix per Maxim's Reset Voltage Threshold Suffix Guide. These values are guaranteed over -40°C to +85°C with ±1.5% tolerance and 20ppm/°C tempco - confirmed in the Electrical Characteristics table.
Does the MAX6718UKSHD3+T include a watchdog timer or power-fail functionality?
No, the MAX6718UKSHD3+T does not include watchdog timer, RSTIN, PFI, or PFO functionality. Per the Selector Guide and Pin Configuration tables, it is a dual-supply supervisor with only VCC1, VCC2, MR, RST, and GND pins. Watchdog and power-fail features appear only in MAX6721–MAX6729 variants.
What is the reset timeout period for the MAX6718UKSHD3+T, and is it adjustable?
The MAX6718UKSHD3+T has a fixed minimum reset timeout period of 210ms, denoted by the "D3" suffix in its part number. This value is factory-set and non-adjustable; no external capacitor or resistor modifies the timeout. The actual timeout may vary slightly with temperature but remains ≥210ms across the full operating range.
Can the MAX6718UKSHD3+T operate with VCC1 = 1.8V and VCC2 = 1.2V?
No - the MAX6718UKSHD3+T is specified for VCC1 = 1.8V to 5.0V and VCC2 = 0.9V to 3.3V, but its factory-trimmed thresholds (4.625V/3.075V) require VCC1 ≥ 4.625V and VCC2 ≥ 3.075V to function as intended. At 1.8V/1.2V, the comparators cannot assert reset because both supplies fall far below their thresholds; the device remains in permanent reset state.
Is the RST output of the MAX6718UKSHD3+T push-pull or open-drain, and what are its drive capabilities?
The MAX6718UKSHD3+T features a push-pull RST output (confirmed by Selector Guide and Pin Description). It drives actively high (to VCC1) and low (to GND) without external components. At VCC1 ≥ 4.5V, it sinks 3.2mA with VOL ≤ 0.4V and sources 800µA with VOH ≥ 0.8×VCC1 - enabling direct connection to µP reset pins without pullup resistors.
MAX6718UKSHD3+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:
- Active
- Programmable:
- Not Verified
- Type:
- Multi-Voltage Supervisor
- Number of Voltages Monitored:
- 2
- Voltage - Threshold:
- 1.313V, 2.925V
- 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
MAX6718UKSHD3+T FAQ
1.How can I place an order for MAX6718UKSHD3+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6718UKSHD3+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 MAX6718UKSHD3+T reliable?
The price and inventory of MAX6718UKSHD3+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6718UKSHD3+T is usually 5 days.
3.What payment methods are accepted for MAX6718UKSHD3+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6718UKSHD3+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6718UKSHD3+T?
MAX6718UKSHD3+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6718UKSHD3+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 MAX6718UKSHD3+T?
For technical support, including MAX6718UKSHD3+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6718UKSHD3+T requirements.
6.How does Aetrix verify that MAX6718UKSHD3+T is sourced from the original manufacturer or authorized distributors?
All MAX6718UKSHD3+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 MAX6718UKSHD3+T meets industry standards.
7.What is the process for return or replacement of MAX6718UKSHD3+T?
All MAX6718UKSHD3+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6718UKSHD3+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 MAX6718UKSHD3+T part is unused and in its original packaging.
Return procedure for MAX6718UKSHD3+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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