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Analog Devices Inc./Maxim Integrated MAX6718UKVDD3+
- Part No.:
- MAX6718UKVDD3+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6718UKVDD3+.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,206
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Product details
Overview
MAX6718UKVDD3+ from Maxim Integrated is a dual-voltage microprocessor supervisory circuit in 5-pin SOT23 package, monitoring VCC1 (primary) and VCC2 (secondary) supplies with factory-trimmed reset thresholds of 4.625V (VTH1) and 3.075V (VTH2), 210ms minimum reset timeout, push-pull active-low RST output, and guaranteed reset validity down to VCC1 or VCC2 = 0.8V - used in telecom power sequencing and server board management.
For engineers reviewing the MAX6718UKVDD3+ datasheet, MAX6718UKVDD3+ pinout, MAX6718UKVDD3+ application, or MAX6718UKVDD3+ equivalent, key selection criteria include dual-supply threshold accuracy, push-pull reset drive capability, low 14µA typical supply current at 3.6V, immunity to sub-20µs VCC transients, and operation across –40°C to +85°C industrial temperature range.
Technical Context
The MAX6718UKVDD3+ integrates two independent voltage comparators with 20ppm/°C tempco and 0.5% hysteresis referenced to VTH typical, driving a single-shot reset timeout timer with fixed 210ms (min) delay. Its push-pull RST output is referenced to VCC1 and sinks up to 3.2mA at 4.5V while maintaining VOL ≤ 0.4V.
It features an internal 50kΩ pullup on MR input, supports manual reset assertion with ≥1µs pulse width and 100ns glitch rejection, and guarantees correct reset logic state when either VCC1 or VCC2 remains >0.8V - enabling reliable brownout detection in multirail embedded systems without external biasing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC1 Reset Threshold | 4.625V (typ), factory-trimmed for precise primary supply monitoring in 5V/3.3V systems |
| VCC2 Reset Threshold | 3.075V (typ), factory-trimmed for accurate secondary supply validation in I/O rail supervision |
| Reset Timeout Period | 210ms (min), ensures µP reset hold time meets boot initialization requirements |
| Supply Current | 14µA (typ) at 3.6V, enables ultra-low-power operation in battery-backed or always-on subsystems |
| Operating Temperature | –40°C to +85°C, qualified for industrial and telecom equipment deployment |
| Reset Output Type | Push-pull active-low RST, eliminates need for external pullup and drives directly into µP reset pin |
| VCC Transient Immunity | Immune to VCC glitches <20µs duration, prevents spurious resets during switching noise events |
Pinout & Package
MAX6718UKVDD3+ uses a 5-pin SOT23-5 package (2.9mm × 1.6mm × 1.1mm) with gull-wing leads, JEDEC MO-178AA compliant, lead-free (+T suffix), and rated for reflow per J-STD-020.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RST | Active-low push-pull reset output referenced to VCC1; asserts low on VCC1/VCC2 undervoltage or MR low |
| 2 | GND | Ground reference for all internal comparators, timer, and output driver |
| 3 | MR | Active-low manual reset input with internal 50kΩ pullup to VCC1; ≥1µs pulse forces reset |
| 4 | VCC2 | Secondary supply input powering comparator for VCC2 threshold detection and RST2 (not present) |
| 5 | VCC1 | Primary supply input powering core logic, VCC1 comparator, and RST output driver |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent voltage monitoring | Simultaneous VCC1 (1.58–4.63V) and VCC2 (0.79–3.08V) supervision with separate thresholds and hysteresis |
| Guaranteed reset validity down to 0.8V | Ensures deterministic reset behavior during deep brownout, eliminating need for external voltage translators |
| Push-pull RST output | Drives µP reset pin directly without external pullup resistor, reducing BOM count and layout area |
| Low 14µA supply current | Minimizes standby power draw in always-on supervisory functions for portable and energy-sensitive designs |
| 20µs VCC transient immunity | Rejects high-frequency noise on power rails without false triggering, improving system robustness in noisy environments |
Applications
| Telecom Power Sequencing | Server Board Management |
|---|---|
Use Scenario: Sequencing startup of FPGA, PHY, and CPU rails in 48V DC-powered telecom line cards. IC Role / Device Role / Timing Role: Dual-supply supervisor asserting reset until both 3.3V I/O and 1.2V core rails stabilize above 3.075V and 4.625V respectively. Use Value: Prevents metastability and latch-up by enforcing strict voltage-ordering before release of processor reset. |
Use Scenario: Monitoring redundant 5V and 3.3V backup supplies in enterprise server baseboard management controllers (BMC). IC Role / Device Role / Timing Role: Providing fail-safe reset hold during AC loss or PSU fault, with 210ms timeout ensuring firmware-initiated recovery window. Use Value: Enables graceful shutdown and state preservation via BMC interrupt before main CPU reset assertion. |
| Industrial PLC I/O Modules | Portable Medical Device Power Control |
Use Scenario: Supervising isolated 24V field bus and 5V logic rails in programmable logic controller (PLC) digital I/O modules. IC Role / Device Role / Timing Role: Detecting undervoltage on both rails and holding reset until both exceed thresholds, with MR input supporting field-service reset. Use Value: Eliminates need for discrete comparator + timer circuits, reducing footprint and qualification effort for safety-critical I/O stages. |
Use Scenario: Managing battery-backed real-time clock (RTC) and sensor interface rails in handheld diagnostic devices. IC Role / Device Role / Timing Role: Monitoring main Li-ion (4.2V) and regulated 3.3V sensor supply, asserting reset if either drops below threshold during discharge. Use Value: Extends usable battery life by enabling clean shutdown before brownout-induced data corruption. |
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 4.625V/3.075V thresholds and 210ms timeout, but 6-pin SOT23-6 with open-drain RST output | Requires external pullup resistor; unsuitable where direct-drive reset is needed | Select MAX6716UTLTD3-T only when open-drain flexibility (e.g., wired-OR reset buses) is required |
| TPS3808G33DBVR | Single-supply monitor (3.3V threshold only), 200ms timeout, 1.6µA quiescent current, SOT23-5 | Lacks VCC2 monitoring; cannot replace dual-rail supervision without adding second IC | Choose TPS3808G33DBVR only for cost-sensitive single-rail applications where secondary supply is inherently stable |
Compared with MAX6718UKVDD3+, MAX6716UTLTD3-T offers identical voltage thresholds and timing but requires external pullup due to open-drain RST, while TPS3808G33DBVR reduces supply current by 90% but sacrifices dual-supply capability - making MAX6718UKVDD3+ optimal for space-constrained dual-rail systems needing push-pull drive.
Availability
MAX6718UKVDD3+ is available at Aetrix Electronics and suitable for telecom power sequencing, server board management, and industrial PLC I/O modules requiring stable component supply with full lifecycle support.
Supply support for MAX6718UKVDD3+ 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, and communications markets, with expertise in power management and reliability-critical supervision.
The MAX6715–MAX6729 family delivers ultra-low-voltage dual/triple supervisory circuits optimized for multirail embedded systems demanding guaranteed reset validity, low quiescent current, and compact SOT23 packaging.
FAQ
What is the exact reset threshold voltage for VCC1 on the MAX6718UKVDD3+?
The MAX6718UKVDD3+ has a factory-trimmed VCC1 reset threshold of 4.625V (typical), with min/max values of 4.500V and 4.750V over temperature. This value is encoded in the "V" suffix per Maxim's Reset Voltage Threshold Suffix Guide and applies specifically to the MAX6718UKVDD3+ variant - not the broader MAX6715–MAX6729 family.
Does the MAX6718UKVDD3+ support monitoring a third voltage rail?
No, the MAX6718UKVDD3+ is a dual-voltage supervisor and does not include RSTIN or PFI inputs. It monitors only VCC1 and VCC2. For triple-voltage monitoring, consider MAX6719UKVDD3+ (with RSTIN) or MAX6728KA-VDD3+ (with PFI/PFO), both of which add auxiliary rail supervision capability absent in MAX6718UKVDD3+.
What is the function of Pin 3 (MR) on the MAX6718UKVDD3+?
Pin 3 (MR) is the active-low manual reset input with an internal 50kΩ pullup to VCC1. Driving MR low for ≥1µs forces the RST output low for the full 210ms timeout period, regardless of VCC1/VCC2 status. Leaving MR unconnected or tied to VCC1 disables manual reset - a feature used for field service or debug-triggered system restarts in the MAX6718UKVDD3+.
Can the MAX6718UKVDD3+ operate with VCC1 = 2.5V?
No - the MAX6718UKVDD3+ VCC1 threshold is fixed at 4.625V (typ), so it is intended for systems where the primary supply is ≥4.5V. Operation at 2.5V violates the specified VCC1 range (minimum 4.500V per datasheet) and will not assert reset correctly. For 2.5V primary rails, select a variant with "W" (1.665V) or "I" (1.388V) VCC1 suffix instead of "V".
What is the maximum sink current capability of the RST output on the MAX6718UKVDD3+?
The MAX6718UKVDD3+ RST output can sink up to 3.2mA while maintaining VOL ≤ 0.4V when VCC1 ≥ 4.5V. At lower VCC1 voltages, sink capability scales: 100µA at VCC1 ≥ 1.2V (VOL ≤ 0.3V), 50µA at VCC1 ≥ 1.0V, and 1µA at VCC1 ≥ 0.8V - ensuring interoperability with diverse µP reset input impedance profiles across its full operating range.
MAX6718UKVDD3+ 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:
- 788mV, 1.575V
- 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
MAX6718UKVDD3+ FAQ
1.How can I place an order for MAX6718UKVDD3+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6718UKVDD3+ 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 MAX6718UKVDD3+ reliable?
The price and inventory of MAX6718UKVDD3+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6718UKVDD3+ is usually 5 days.
3.What payment methods are accepted for MAX6718UKVDD3+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6718UKVDD3+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6718UKVDD3+?
MAX6718UKVDD3+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6718UKVDD3+ 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 MAX6718UKVDD3+?
For technical support, including MAX6718UKVDD3+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6718UKVDD3+ requirements.
6.How does Aetrix verify that MAX6718UKVDD3+ is sourced from the original manufacturer or authorized distributors?
All MAX6718UKVDD3+ 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 MAX6718UKVDD3+ meets industry standards.
7.What is the process for return or replacement of MAX6718UKVDD3+?
All MAX6718UKVDD3+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6718UKVDD3+, 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 MAX6718UKVDD3+ part is unused and in its original packaging.
Return procedure for MAX6718UKVDD3+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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