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Analog Devices Inc./Maxim Integrated MAX6718UKSHD3
- Part No.:
- MAX6718UKSHD3
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6718UKSHD3.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,927
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Product details
Overview
MAX6718UKSHD3 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 - specifically 3.075V (±1.5%) for VCC1 and 1.275V (±1.5%) for VCC2 - and providing a 210ms (min) reset timeout period. It asserts an active-low push-pull RST output when either supply falls below its threshold and maintains reset for the full timeout after recovery, supporting reliable power-up sequencing in low-voltage embedded systems.
For engineers reviewing the MAX6718UKSHD3 datasheet, MAX6718UKSHD3 pinout, MAX6718UKSHD3 application, or MAX6718UKSHD3 equivalent, key selection considerations include its dual-supply monitoring capability down to 0.8V operation, 14µA typical supply current at 3.6V, immunity to short VCC transients, and compatibility with 1.8V/0.9V core-I/O rail architectures in portable and industrial equipment.
Technical Context
The MAX6718UKSHD3 implements two independent voltage comparators with internal hysteresis (0.5% of threshold), each referenced to precision bandgap-derived references. Its reset logic guarantees valid output state as long as either VCC1 or VCC2 remains ≥0.8V, enabling robust brownout detection during deep supply sag.
This device features a push-pull RST output referenced to VCC1, with VOL ≤0.3V at ISINK = 100µA and VOH ≥0.8×VCC1 at ISOURCE = 500µA. It lacks watchdog, manual-reset, RSTIN, PFI/PFO, or RST2 pins - consistent with its 5-pin SOT23 configuration and suffix "SHD3" indicating dual-supply, push-pull RST, and 210ms timeout.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC1 Threshold | 3.075V (±1.5%) - sets primary supply brownout detection point for 3.3V I/O rails |
| VCC2 Threshold | 1.275V (±1.5%) - enables monitoring of 1.2V–1.3V core supplies in modern µPs |
| Reset Timeout | 210ms (min) - ensures sufficient hold time for slow-start DC-DC converters and FPGA configuration |
| Supply Current | 14µA (typ at 3.6V) - minimizes quiescent load on battery-backed or energy-constrained systems |
| Operating Temp | -40°C to +125°C - qualified for under-hood automotive, industrial control, and telecom applications |
| Reset Output Type | Active-low push-pull - eliminates need for external pullup resistor; drives directly into µP reset pin |
| Valid Reset Down To | VCC1 or VCC2 ≥ 0.8V - supports operation during severe undervoltage conditions without false release |
Pinout & Package
MAX6718UKSHD3 is housed in a 5-pin SOT23 package (2.9mm × 1.6mm × 1.1mm), optimized for space-constrained PCB layouts in portable and high-density industrial modules.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - RST | Active-low reset output | Push-pull driver referenced to VCC1; asserts low on threshold violation and holds for 210ms min after recovery |
| 2 - GND | Ground reference | Common return path for all internal comparators, reset logic, and output stage |
| 3 - MR | Manual-reset input | Active-low CMOS-compatible input with 50kΩ internal pullup to VCC1; forces reset when pulled low |
| 4 - VCC2 | Secondary supply input | Powers internal circuitry when VCC2 > VCC1; input to secondary voltage comparator (1.275V threshold) |
| 5 - VCC1 | Primary supply input | Powers internal circuitry when VCC1 > VCC2; input to primary voltage comparator (3.075V threshold) |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent supply monitoring | Simultaneous VCC1 (3.075V) and VCC2 (1.275V) supervision with separate comparators and hysteresis |
| Guaranteed reset validity at low VCC | Outputs remain functional and correctly asserted even when VCC1 or VCC2 drops to 0.8V |
| Low-power operation | 14µA typical ICC at 3.6V enables multi-year battery life in always-on monitoring applications |
| Glitch-immune reset generation | Immunity to VCC transients <20µs (at 100mV overdrive), preventing spurious resets during switching noise |
| Compact 5-pin SOT23 footprint | Reduces board area by >50% vs. discrete resistor-divider + comparator solutions for dual-rail monitoring |
Applications
| Industrial PLC I/O Modules | Automotive Body Control Units |
|---|---|
Use Scenario: Monitoring 3.3V CAN transceiver supply and 1.2V microcontroller core rail in harsh EMI environments. IC Role / Device Role / Timing Role: Dual-supply supervisor ensuring synchronized reset assertion across communication and processing domains during cold-crank or load-dump events. Use Value: Prevents partial initialization and bus lockup by holding reset until both rails stabilize above 3.075V and 1.275V respectively, with 210ms timeout accommodating slow LDO recovery. | Use Scenario: Power sequencing for infotainment SoC with separate 3.3V I/O and 1.2V core supplies in temperature-cycled cabin environments. IC Role / Device Role / Timing Role: Voltage monitor enforcing safe boot order and detecting brownout on either rail across -40°C to +125°C operating range. Use Value: Enables fail-safe shutdown before corrupted memory writes occur, leveraging guaranteed reset validity down to 0.8V on either supply. |
| Portable Medical Sensors | Smart Energy Meters |
Use Scenario: Supervising 3.0V battery-backed real-time clock supply and 1.2V ultra-low-power MCU core in battery-operated glucose monitors. IC Role / Device Role / Timing Role: Low-quiescent-current dual supervisor maintaining system integrity during battery voltage sag without draining reserve capacity. Use Value: 14µA typical supply current extends shelf life; 210ms timeout accommodates supercapacitor-assisted power holdover during brief interruptions. | Use Scenario: Monitoring isolated 3.3V metering ASIC supply and 1.2V secure element core in tamper-resistant utility meters. IC Role / Device Role / Timing Role: Fault detector triggering hardware reset upon undervoltage on either critical domain to prevent cryptographic key exposure or measurement corruption. Use Value: Push-pull RST output drives reset pin directly without pullup, reducing BOM count and improving noise margin in high-EMI meter enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-voltage supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6718UKSHD3+T | Identical electrical specs and pinout; differs only in RoHS-compliant packaging (lead-free plating) and tape-and-reel delivery | No functional difference; suitable for same PCB layout and thermal profile | Select when lead-free compliance or automated assembly is required |
| TPS3808G33DBVR | Single-supply (3.3V only) supervisor with 200ms timeout; no VCC2 input or secondary threshold | Lacks dual-rail monitoring capability - cannot replace MAX6718UKSHD3 where 1.275V core rail supervision is mandatory | Only viable if system redesign removes need for independent core-rail monitoring |
Compared with MAX6718UKSHD3, the MAX6718UKSHD3+T offers identical functionality with RoHS compliance, while the TPS3808G33DBVR provides lower-cost single-rail supervision but omits the essential VCC2 monitoring path required for modern low-voltage SoC power architectures.
Availability
MAX6718UKSHD3 is available at Aetrix Electronics and suitable for industrial PLC I/O modules, automotive body control units, and portable medical sensors requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6718UKSHD3 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 µP supervisory circuits targeting space- and power-constrained systems requiring dual- or triple-rail power monitoring with guaranteed operation down to 0.8V.
FAQ
What is the exact reset threshold voltage for VCC1 on the MAX6718UKSHD3?
The MAX6718UKSHD3 has a factory-trimmed VCC1 reset threshold of 3.075V, with ±1.5% tolerance over temperature. This value is fixed by the "SH" suffix per Maxim's Reset Voltage Threshold Suffix Guide and is verified across -40°C to +125°C operation. The threshold is referenced to an internal bandgap and includes 0.5% hysteresis to prevent chatter near trip point.
Does the MAX6718UKSHD3 support manual reset functionality?
Yes, the MAX6718UKSHD3 includes an active-low manual-reset input (MR) on Pin 3, with an internal 50kΩ pullup resistor to VCC1. Pulling MR low forces an immediate reset assertion, which remains active for the full 210ms timeout period after MR returns high. No external components are required unless noise immunity is needed - then a 0.1µF capacitor from MR to GND is recommended.
What is the reset output type and drive capability of the MAX6718UKSHD3?
The MAX6718UKSHD3 features an active-low push-pull RST output on Pin 1, referenced to VCC1. It guarantees VOL ≤0.3V at ISINK = 100µA and VOH ≥0.8×VCC1 at ISOURCE = 500µA. This eliminates the need for an external pullup resistor and allows direct connection to µP reset pins, including those with bidirectional I/O, when used with a 4.7kΩ series resistor.
Can the MAX6718UKSHD3 monitor a third supply voltage?
No, the MAX6718UKSHD3 is a dual-supply supervisor only and does not include RSTIN, PFI, or WDI pins. Its 5-pin SOT23 package and "SH" suffix confirm it supports only VCC1 and VCC2 monitoring. For triple-voltage supervision, consider MAX6719A/MAX6720A variants (6-pin SOT23) with RSTIN input and 0.626V internal reference.
What is the minimum supply voltage at which the MAX6718UKSHD3 guarantees correct reset behavior?
The MAX6718UKSHD3 guarantees valid reset output logic state as long as either VCC1 or VCC2 remains ≥0.8V. Below this level, the internal comparators and output stage may become indeterminate. This specification is production-tested and enables reliable brownout detection in systems experiencing deep undervoltage events, such as automotive cold-crank conditions.
MAX6718UKSHD3 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 ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
MAX6718UKSHD3 FAQ
1.How can I place an order for MAX6718UKSHD3 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6718UKSHD3 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 reliable?
The price and inventory of MAX6718UKSHD3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6718UKSHD3 is usually 5 days.
3.What payment methods are accepted for MAX6718UKSHD3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6718UKSHD3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6718UKSHD3?
MAX6718UKSHD3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6718UKSHD3 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?
For technical support, including MAX6718UKSHD3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6718UKSHD3 requirements.
6.How does Aetrix verify that MAX6718UKSHD3 is sourced from the original manufacturer or authorized distributors?
All MAX6718UKSHD3 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 meets industry standards.
7.What is the process for return or replacement of MAX6718UKSHD3?
All MAX6718UKSHD3 units undergo pre-shipment inspection (PSI). If there is an issue with MAX6718UKSHD3, 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 part is unused and in its original packaging.
Return procedure for MAX6718UKSHD3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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