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Analog Devices Inc./Maxim Integrated MAX6718UKLTD3+T
- Part No.:
- MAX6718UKLTD3+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6718UKLTD3+T.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
MAX6718UKLTD3+T from Maxim Integrated is a dual-voltage microprocessor supervisory IC in 5-pin SOT23 package, monitoring VCC1 (primary supply) and VCC2 (secondary supply) with factory-trimmed reset thresholds of 4.625V (VTH1) and 3.075V (VTH2), 210ms minimum 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 systems.
For engineers reviewing the MAX6718UKLTD3+T datasheet, MAX6718UKLTD3+T pinout, MAX6718UKLTD3+T application, or MAX6718UKLTD3+T equivalent, key selection criteria include guaranteed reset validity down to VCC1/VCC2 = 0.8V, 14µA typical supply current at 3.6V, immunity to short VCC transients, and compatibility with low-voltage core/I/O rail sequencing in portable equipment.
Technical Context
The MAX6718UKLTD3+T implements dual independent voltage comparators with precision internal references (±1.5% threshold accuracy), a programmable reset timeout timer (210ms min), and a push-pull RST output referenced to VCC1. It asserts reset when either VCC1 falls below 4.625V or VCC2 drops below 3.075V, and holds reset for the full timeout after both supplies recover.
No watchdog, RSTIN, PFI/PFO, or RST2 functionality is included - confirmed by Selector Guide and Pin Configuration tables showing MAX6718 as 2-monitor, push-pull RST-only, MR-enabled, no auxiliary inputs. Its 5-pin SOT23-5 footprint supports space-constrained PCB layouts while maintaining full reset supervision integrity across -40°C to +85°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC1 Reset Threshold | 4.625V (factory-trimmed, ±1.5% max tolerance) - ensures clean reset assertion before 5V or 4.8V logic rails collapse. |
| VCC2 Reset Threshold | 3.075V (factory-trimmed, ±1.5% max tolerance) - matches common 3.3V I/O supply margin for safe deassertion. |
| Reset Timeout Period | 210ms (minimum) - provides sufficient hold time for slow-start DC/DC converters and firmware initialization. |
| Supply Current | 14µA (typical at 3.6V) - enables multi-year operation in coin-cell–powered devices without compromising supervision reliability. |
| Operating Temperature | -40°C to +85°C - qualified for industrial and extended commercial environments without derating. |
| Reset Output Type | Push-pull active-low RST - eliminates need for external pullup resistor and drives directly into µP reset pin. |
| Minimum Valid VCC | 0.8V (VCC1 or VCC2) - guarantees correct reset logic state during deep brownout, critical for nonvolatile memory write protection. |
Pinout & Package
MAX6718UKLTD3+T is housed in a 5-pin SOT23-5 package (2.9mm × 1.6mm × 1.1mm), surface-mount, lead-free (+T suffix), with gull-wing leads and standard JEDEC MO-178AC outline.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RST | Active-low push-pull reset output referenced to VCC1; sinks 3.2mA at VCC1 ≥ 4.5V; drives µP reset pin directly without pullup. |
| 2 | GND | System ground reference for all internal comparators, timers, and output drivers; must be low-impedance connection. |
| 3 | MR | Active-low manual reset input with 50kΩ internal pullup to VCC1; 1µs minimum pulse width; immune to <100ns glitches. |
| 4 | VCC2 | Secondary supply input (0.9V–3.3V range); powers internal VCC2 comparator and sets VTH2 = 3.075V threshold. |
| 5 | VCC1 | Primary supply input (1.8V–5.0V range); powers device core, sets VTH1 = 4.625V threshold, and references RST output. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent voltage monitoring | Simultaneous supervision of primary (VCC1) and secondary (VCC2) rails with separate, factory-trimmed thresholds avoids single-point failure in multirail systems. |
| Guaranteed reset validity down to 0.8V | Ensures deterministic reset behavior even during severe brownout - critical for preventing flash corruption or state machine lockup. |
| Push-pull RST output | Eliminates external pullup resistor, reduces BOM count, improves noise immunity, and supports direct interface to bidirectional µP reset pins via 4.7kΩ series resistor. |
| Low 14µA supply current | Enables always-on supervision in energy-harvesting and battery-backed applications without measurable impact on system runtime. |
| Immunity to short VCC transients | Withstands ≤20µs negative-going glitches below threshold (per Typical Operating Characteristics), preventing spurious resets in noisy power environments. |
Applications
| Portable Medical Sensors | Industrial PLC I/O Modules |
|---|---|
Use Scenario: Battery-powered glucose meters and pulse oximeters requiring fail-safe boot sequence and brownout protection during intermittent alkaline cell discharge. IC Role / Device Role / Timing Role: Dual-rail supervisor ensuring µP reset remains asserted until both 3.3V analog front-end and 1.8V digital core stabilize post-battery insertion. Use Value: Prevents corrupted ADC calibration and EEPROM writes during marginal battery voltage (down to 0.8V per rail), extending usable battery life by 12–18%. |
Use Scenario: DIN-rail mounted remote I/O modules operating from 24VDC industrial supplies with local 5V/3.3V regulation. IC Role / Device Role / Timing Role: Monitors 5V logic rail (VCC1) and 3.3V FPGA configuration rail (VCC2) to guarantee FPGA reconfiguration completes before µP release from reset. Use Value: Eliminates field failures caused by partial FPGA bitstream loading due to premature reset deassertion during cold-start voltage ramp. |
| Smart Energy Meters | Automotive Body Control Modules |
Use Scenario: ANSI C12.20-compliant electricity meters with isolated RS-485 and metrology SoC powered from split-rail DC/DC. IC Role / Device Role / Timing Role: Supervises 3.3V metrology SoC supply and 5V communication interface supply to enforce synchronized reset across domains. Use Value: Ensures time-critical metrology sampling resumes only after both supplies meet stability criteria, meeting ±0.1% accuracy requirements under transient line conditions. |
Use Scenario: 12V automotive body control unit with LDO-regulated 5V MCU rail and 3.3V sensor interface rail exposed to load-dump and cold-crank events. IC Role / Device Role / Timing Role: Provides robust reset hold-off during cold-crank (battery dip to 6V) by asserting reset until both rails exceed their precise thresholds (4.625V/3.075V). Use Value: Reduces ECU restart failures by >99.7% compared to generic reset ICs lacking sub-1V valid-reset capability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-voltage supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS3808G33DBVR | Single-supply monitor (3.3V only), open-drain RST, 200ms timeout, 1.6µA IQ - lacks VCC2 monitoring and push-pull drive. | Requires external circuitry to supervise dual rails; unsuitable where VCC1/VCC2 sequencing independence is required. | Select only if supervising one rail and ultra-low quiescent current (<2µA) is mandatory over dual-rail coverage. |
| ADM6718AKSZ-RL | Same dual-threshold (4.63V/3.08V), same 210ms timeout, same SOT23-5, but open-drain RST and 25µA IQ - no internal pullup on MR. | Needs external RST pullup; MR requires explicit tie-high or driver; higher supply current reduces battery life in portable use. | Choose only if open-drain flexibility (e.g., wired-OR reset bus) outweighs the benefit of push-pull simplicity and lower IQ. |
Compared with TPS3808G33DBVR and ADM6718AKSZ-RL, the MAX6718UKLTD3+T uniquely delivers integrated dual-rail supervision with push-pull RST and 14µA IQ in identical SOT23-5 packaging - enabling simpler layout, lower component count, and longer battery runtime without sacrificing threshold accuracy or temperature stability.
Availability
MAX6718UKLTD3+T is available at Aetrix Electronics and suitable for portable medical sensors, industrial PLC I/O modules, smart energy meters, and automotive body control modules requiring stable component supply with guaranteed long-term availability and traceable sourcing.
Supply support for MAX6718UKLTD3+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 industrial, automotive, communications, and computing markets, with emphasis on high-reliability, low-power, and small-footprint solutions.
The MAX6715–MAX6729 family was engineered specifically for multivoltage embedded systems needing compact, accurate, and robust power-supply supervision - delivering dual/triple rail monitoring, flexible reset timing, and extended voltage-range operation in SOT23 packages.
FAQ
What is the exact reset threshold voltage for VCC1 on the MAX6718UKLTD3+T?
The MAX6718UKLTD3+T has a factory-trimmed VCC1 reset threshold of 4.625V (minimum 4.500V, maximum 4.750V), as defined by the "LT" suffix per Maxim's Reset Voltage Threshold Suffix Guide - this value is laser-trimmed during production and does not require external adjustment.
Does the MAX6718UKLTD3+T support watchdog timer functionality?
No, the MAX6718UKLTD3+T does not include a watchdog timer. Per Maxim's Selector Guide and Pin Configuration table, only MAX6721–MAX6729 variants support WDI; the MAX6718 is explicitly designated as a dual-supply supervisor with MR and push-pull RST only.
Can the MAX6718UKLTD3+T monitor a 1.2V supply as VCC2?
No - the MAX6718UKLTD3+T's VCC2 input is specified for 0.9V to 3.3V, but its factory-set VCC2 threshold is fixed at 3.075V. A 1.2V supply would never cross that threshold, so it cannot be monitored as VCC2; use RSTIN-capable variants (e.g., MAX6719) for sub-3V auxiliary monitoring.
What is the reset output type and drive strength of the MAX6718UKLTD3+T?
The MAX6718UKLTD3+T features a push-pull active-low RST output referenced to VCC1, capable of sinking 3.2mA at VCC1 ≥ 4.5V (VOL ≤ 0.4V) and sourcing 800µA (VOH ≥ 0.8 × VCC1) - enabling direct connection to most µP reset pins without external components.
Is the MAX6718UKLTD3+T compatible with lead-free PCB assembly processes?
Yes - the "+T" suffix in MAX6718UKLTD3+T explicitly denotes lead-free packaging compliant with RoHS and JEDEC J-STD-020 moisture sensitivity level 1 (MSL1), qualified for standard reflow profiles including peak temperatures up to 260°C.
MAX6718UKLTD3+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:
- 3.075V, 4.625V
- 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
MAX6718UKLTD3+T FAQ
1.How can I place an order for MAX6718UKLTD3+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6718UKLTD3+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 MAX6718UKLTD3+T reliable?
The price and inventory of MAX6718UKLTD3+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6718UKLTD3+T is usually 5 days.
3.What payment methods are accepted for MAX6718UKLTD3+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6718UKLTD3+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6718UKLTD3+T?
MAX6718UKLTD3+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6718UKLTD3+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 MAX6718UKLTD3+T?
For technical support, including MAX6718UKLTD3+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6718UKLTD3+T requirements.
6.How does Aetrix verify that MAX6718UKLTD3+T is sourced from the original manufacturer or authorized distributors?
All MAX6718UKLTD3+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 MAX6718UKLTD3+T meets industry standards.
7.What is the process for return or replacement of MAX6718UKLTD3+T?
All MAX6718UKLTD3+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6718UKLTD3+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 MAX6718UKLTD3+T part is unused and in its original packaging.
Return procedure for MAX6718UKLTD3+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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