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Analog Devices Inc./Maxim Integrated MAX6718AUKSHD3+
- Part No.:
- MAX6718AUKSHD3+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6718AUKSHD3+.pdf
- Description:
- MAX6718 TRIPLE, ULTRA-LOW-VOLTAG
- Quantity:
- Payment:
- Shipping:
Inventory:2,172
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Product details
Overview
The MAX6718AUKSHD3+ from Maxim Integrated is a dual-voltage microprocessor supervisory circuit in 5-pin SOT23 package, monitoring primary (VCC1) and secondary (VCC2) supplies with factory-trimmed reset thresholds of 4.625V (VTH1) and 3.075V (VTH2), 210ms minimum reset timeout, and push-pull active-low RST output. It guarantees valid reset assertion down to VCC1 or VCC2 = 0.8V and draws only 14µA typical supply current at 3.6V - used in telecom power sequencing and industrial embedded controllers requiring reliable brownout detection.
For engineers reviewing the MAX6718AUKSHD3+ datasheet, MAX6718AUKSHD3+ pinout, MAX6718AUKSHD3+ application, or MAX6718AUKSHD3+ equivalent, key selection criteria include dual-supply threshold accuracy (±1.5% over -40°C to +125°C), immunity to sub-20µs VCC transients, guaranteed reset validity at ultra-low supply (0.8V), and compatibility with manual-reset and watchdog-free system architectures.
Technical Context
This device implements two independent voltage comparators with internal hysteresis (0.5% of VTH), a precision 210ms reset timeout timer, and logic-controlled reset assertion via VCC1/VCC2 undervoltage, MR input, or external RSTIN (not enabled on this variant). Its push-pull RST output is referenced to VCC1 and sinks up to 3.2mA at 4.5V.
No watchdog or power-fail functionality is integrated in MAX6718AUKSHD3+ - confirmed by pin configuration (no WDI, PFI, or PFO pins) and suffix "SHD3" indicating dual-supply, push-pull RST, and 210ms timeout without auxiliary inputs. Reset assertion occurs when either supply falls below its trimmed threshold and remains asserted for ≥210ms after both recover.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC1 Reset Threshold | 4.625V (typ), ±1.5% over temp - sets precise brownout point for main 5V/4.8V rail |
| VCC2 Reset Threshold | 3.075V (typ), ±1.5% over temp - monitors 3.3V I/O or auxiliary supply with tight tolerance |
| Reset Timeout Period | 210ms (min) - ensures µP completes full boot sequence before releasing reset |
| Supply Current | 14µA (typ) at 3.6V - enables battery-backed or low-power always-on monitoring |
| Operating Temperature | -40°C to +125°C - qualified for under-hood automotive and industrial control environments |
| Reset Output Type | Push-pull active-low RST - eliminates need for external pullup; drives directly into µP reset pin |
| Valid Reset Down To | VCC1 or VCC2 ≥ 0.8V - maintains deterministic reset state during deep brownout or soft-start |
Pinout & Package
MAX6718AUKSHD3+ uses a 5-pin SOT23 package (2.9mm × 1.6mm × 1.1mm height) with gull-wing leads, RoHS-compliant and tape-and-reel packaged.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RST | Active-low push-pull reset output referenced to VCC1; asserts low on VCC1/VCC2 undervoltage and holds ≥210ms |
| 2 | GND | System ground reference for all comparators, timer, and output stage |
| 3 | MR | Active-low manual-reset input with 50kΩ internal pullup to VCC1; forces reset when pulled low |
| 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 device core and references RST output |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent voltage monitoring | Simultaneous supervision of VCC1 (4.625V) and VCC2 (3.075V) with separate comparators and hysteresis |
| Guaranteed reset validity at 0.8V | Ensures deterministic reset behavior during severe brownout - no undefined output state |
| Ultra-low quiescent current | 14µA typical at 3.6V enables >10-year battery life in always-on monitoring applications |
| Immunity to short VCC transients | Rejects glitches <20µs wide (at 100mV overdrive), preventing spurious resets in noisy power environments |
| Push-pull RST output | Direct drive capability eliminates external pullup resistor, reducing BOM count and PCB area |
Applications
| Telecom Power Sequencing | Industrial PLC Controller |
|---|---|
|
Use Scenario: Dual-rail DC-DC converter startup in base station RF module with 4.8V analog and 3.3V digital supplies. IC Role / Device Role / Timing Role: Supervises VCC1 (4.625V) and VCC2 (3.075V) to enforce strict power-up order and hold µP in reset until both rails stabilize. Use Value: Prevents firmware corruption during asymmetric rail ramp-up; 210ms timeout matches typical DC-DC soft-start duration. |
Use Scenario: Embedded controller in motor drive cabinet exposed to wide ambient temperature (-40°C to +85°C). IC Role / Device Role / Timing Role: Monitors main 5V logic supply and isolated 3.3V I/O supply; asserts reset on undervoltage or operator-initiated MR press. Use Value: -40°C to +125°C rating ensures reliability in uncooled enclosures; push-pull RST drives optocoupler input directly. |
| Medical Diagnostic Equipment | Automotive Body Control Module |
|
Use Scenario: Portable ultrasound unit with battery backup and dual LDO-regulated supplies (4.5V analog front-end, 3.3V digital subsystem). IC Role / Device Role / Timing Role: Detects brownout on either rail and holds ARM Cortex-M4 in reset until both supplies recover above thresholds. Use Value: 14µA supply current extends battery runtime; 0.8V reset validity prevents false release during Li-ion discharge tail. |
Use Scenario: BCM powered from vehicle battery (9V–16V) with internal 5V/3.3V regulators subject to load dump and cold-crank transients. IC Role / Device Role / Timing Role: Supervises regulated 5V MCU supply and 3.3V CAN transceiver supply; rejects <20µs transients per ISO 7637-2. Use Value: Immunity to ignition noise avoids unintended resets; guaranteed operation at 0.8V supports cold-crank recovery. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-voltage supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6716AUTLTD3+T | 6-pin SOT23; identical VTH1/VTH2 (4.625V/3.075V), 210ms timeout, but includes RST2 output referenced to VCC2 | Supports independent reset signaling to dual-voltage subsystems (e.g., separate 3.3V FPGA and 5V µP) | Select when discrete reset control for VCC2-domain logic is required; adds one pin and layout complexity |
| TPS3808G33DBVR | Single-supply supervisor (3.3V threshold only); 200ms timeout; open-drain RST; 1.5µA IQ | Lacks VCC2 monitoring - requires second IC for dual-rail systems | Choose only for single-rail designs; lower IQ benefits battery apps, but dual-monitoring gap increases BOM and board space |
Compared with MAX6718AUKSHD3+, MAX6716AUTLTD3+T adds VCC2-referenced RST2 for domain-isolated reset control, while TPS3808G33DBVR reduces supply current but sacrifices dual-supply capability - making MAX6718AUKSHD3+ optimal for compact, cost-sensitive dual-rail systems needing push-pull simplicity and guaranteed 0.8V operation.
Availability
MAX6718AUKSHD3+ is available at Aetrix Electronics and suitable for telecom power sequencing, industrial PLC controllers, and automotive body control modules requiring stable component supply across extended temperature and long-lifecycle production.
Supply support for MAX6718AUKSHD3+ 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.
The MAX6715A–MAX6729A family delivers ultra-low-voltage, multi-rail supervision in miniature SOT23 packages - engineered for space-constrained systems where dual-supply integrity and deterministic reset timing are critical.
FAQ
What is the exact reset threshold voltage for VCC1 and VCC2 on the MAX6718AUKSHD3+?
The MAX6718AUKSHD3+ has factory-trimmed reset thresholds of 4.625V (VTH1) for VCC1 and 3.075V (VTH2) for VCC2, with ±1.5% tolerance over -40°C to +125°C. These values are fixed by the "SH" suffix per Maxim's Reset Voltage Threshold Suffix Guide and do not require external resistor programming. The MAX6718AUKSHD3+ does not support adjustable RSTIN monitoring.
Does the MAX6718AUKSHD3+ include a watchdog timer or power-fail detection feature?
No, the MAX6718AUKSHD3+ does not include watchdog timer (WDI) or power-fail input/output (PFI/PFO) functionality. Its pinout (5-pin SOT23) and suffix "SHD3" confirm it is a dual-supply-only variant with push-pull RST, manual reset (MR), and no auxiliary inputs. Watchdog capability requires variants like MAX6721A or MAX6729A with dedicated WDI and PFI pins.
What is the minimum supply voltage at which MAX6718AUKSHD3+ guarantees correct reset output logic?
The MAX6718AUKSHD3+ guarantees valid reset output logic when either VCC1 or VCC2 remains ≥ 0.8V - verified across -40°C to +125°C. Below 0.8V, reset behavior is not specified. This ensures robust operation during deep brownout events, unlike many supervisors that fail below 1.0V or require external pulldown resistors.
Can the MAX6718AUKSHD3+ be used with a microprocessor that has a bidirectional reset pin?
Yes, the MAX6718AUKSHD3+ push-pull RST output can interface directly with most µP bidirectional reset pins. To prevent contention during µP-driven reset assertion, place a 4.7kΩ series resistor between RST and the µP pin - as documented in Maxim's Application Note 4331. This limits current and allows safe bidirectional control without logic conflict.
What is the reset timeout period for MAX6718AUKSHD3+, and is it adjustable?
The MAX6718AUKSHD3+ has a fixed minimum reset timeout period of 210ms, indicated by the "D3" suffix in its part number. This value is factory-trimmed and non-adjustable via external components. The timeout begins when VCC1 and VCC2 rise above their respective thresholds and ensures sufficient hold time for full µP initialization before release.
MAX6718AUKSHD3+ 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:
- 1.313V, 2.925V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
MAX6718AUKSHD3+ FAQ
1.How can I place an order for MAX6718AUKSHD3+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6718AUKSHD3+ 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 MAX6718AUKSHD3+ reliable?
The price and inventory of MAX6718AUKSHD3+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6718AUKSHD3+ is usually 5 days.
3.What payment methods are accepted for MAX6718AUKSHD3+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6718AUKSHD3+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6718AUKSHD3+?
MAX6718AUKSHD3+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6718AUKSHD3+ 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 MAX6718AUKSHD3+?
For technical support, including MAX6718AUKSHD3+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6718AUKSHD3+ requirements.
6.How does Aetrix verify that MAX6718AUKSHD3+ is sourced from the original manufacturer or authorized distributors?
All MAX6718AUKSHD3+ 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 MAX6718AUKSHD3+ meets industry standards.
7.What is the process for return or replacement of MAX6718AUKSHD3+?
All MAX6718AUKSHD3+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6718AUKSHD3+, 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 MAX6718AUKSHD3+ part is unused and in its original packaging.
Return procedure for MAX6718AUKSHD3+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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