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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:6,236
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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 telecom power sequencing and embedded system boot integrity.
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 feeding a shared reset timeout timer (210ms min). Its push-pull RST output is referenced to VCC1 and drives high to ≥0.8×VCC1 when deasserted, eliminating external pull-up requirements.
It integrates a 50kΩ internal MR pull-up to VCC1, supports 1µs minimum MR pulse width with 100ns glitch rejection, and guarantees correct reset logic state even when either supply drops to 0.8V - enabling robust brownout detection in battery-backed systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC1 Threshold | 4.625V (factory-trimmed, ±1.5% over -40°C to +85°C) - ensures reliable reset assertion during 5V rail collapse |
| VCC2 Threshold | 3.075V (factory-trimmed, ±1.5% over -40°C to +85°C) - matches common 3.3V I/O supply tolerance bands |
| Reset Timeout | 210ms (minimum) - provides sufficient hold time for FPGA configuration or flash memory initialization |
| Supply Current | 14µA (typical at 3.6V) - enables multi-year operation in always-on IoT sensor nodes |
| Reset Output Type | Push-pull active-low RST - eliminates external pull-up resistor, reduces BOM count and PCB area |
| MR Input Logic | Active-low with 50kΩ internal pull-up to VCC1 - allows direct connection to open-drain GPIO or momentary switch to GND |
| Operating Temp | -40°C to +85°C - qualified for industrial and telecom equipment environments |
Pinout & Package
MAX6718UKSHD3-T uses a 5-pin SOT23-5 package (2.9mm × 1.6mm × 1.1mm height) with gull-wing leads, RoHS-compliant lead-free finish, and thermal pad not electrically connected.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RST | Push-pull active-low reset output referenced to VCC1; sinks up to 3.2mA at VCC1 ≥ 4.5V |
| 2 | GND | Analog/digital ground reference for all comparators and internal logic |
| 3 | MR | Active-low manual reset input with internal 50kΩ pull-up to VCC1; accepts TTL/CMOS levels |
| 4 | VCC2 | Secondary supply input (monitored at 3.075V); powers internal VCC2 comparator and bias circuits |
| 5 | VCC1 | Primary supply input (monitored at 4.625V); powers device core, RST driver, and MR pull-up |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent voltage monitoring | Simultaneous 4.625V/3.075V thresholds with <20µs response delay - prevents false resets during fast rail transitions |
| Guaranteed reset validity down to 0.8V | Ensures deterministic reset assertion even during deep brownout conditions on either supply rail |
| Immunity to short VCC transients | Rejects glitches ≤20µs duration at 100mV overdrive - eliminates spurious resets in noisy power environments |
| Low quiescent current | 14µA typical at 3.6V - extends battery life in portable medical and metering devices |
| Integrated MR pull-up | 50kΩ internal resistor to VCC1 - removes need for external component and simplifies layout |
Applications
| Telecom Power Sequencing | Industrial PLC I/O Modules |
|---|---|
Use Scenario: Sequencing 48V DC-DC converter outputs (5V, 3.3V) in carrier-grade access equipment. IC Role / Device Role / Timing Role: Dual-supply monitor asserting reset until both rails stabilize within 210ms window. Use Value: Prevents firmware execution before power rails settle, avoiding EEPROM corruption during cold start. |
Use Scenario: Ensuring safe startup of analog input channels and digital isolators in DIN-rail mounted controllers. IC Role / Device Role / Timing Role: Supervises 3.3V logic and 24V field-side supplies; MR pin enables field-service reset via front-panel button. Use Value: Eliminates need for discrete reset ICs and RC networks, reducing board space by >30% vs. legacy designs. |
| Portable Medical Sensors | Set-Top Box Boot Integrity |
Use Scenario: Battery-powered glucose monitor with 1.8V MCU core and 3.3V sensor interface rail. IC Role / Device Role / Timing Role: Monitors both rails simultaneously; 14µA ICC enables >5-year shelf life with coin-cell backup. Use Value: Guarantees reset remains asserted if either rail sags below threshold during battery discharge curve knee. |
Use Scenario: Validating stable 1.2V SoC core and 3.3V HDMI PHY supplies before Linux kernel decompression. IC Role / Device Role / Timing Role: Push-pull RST directly drives SoC reset pin without pull-up; 210ms timeout covers DDR initialization. Use Value: Removes risk of partial boot failure due to marginal power delivery, improving first-boot success rate to >99.99%. |
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 | 3.3V fixed VDD threshold only; no secondary supply monitor; 200ms timeout; open-drain RST | Requires external resistor divider to monitor second rail; needs pull-up resistor on RST | Select when only single-rail supervision is needed and cost sensitivity outweighs dual-monitoring capability |
| ADM6718ARJZ-RL7 | 4.63V/3.08V thresholds; 200ms timeout; open-drain RST; no internal MR pull-up | Requires external 100kΩ MR pull-up; higher 25µA ICC increases battery drain | Choose when open-drain output is mandatory for wired-OR reset bus topologies |
Compared with MAX6718UKSHD3-T, TPS3808G33DBVR lacks dual-supply monitoring and requires external components for MR and RST, while ADM6718ARJZ-RL7 offers matching thresholds but higher current draw and no integrated MR pull-up - making MAX6718UKSHD3-T optimal for compact, low-power dual-rail systems requiring minimal external parts.
Availability
MAX6718UKSHD3-T is available at Aetrix Electronics and suitable for telecom infrastructure, industrial PLCs, and portable medical devices requiring stable component supply across extended product 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 and mixed-signal ICs for power management, sensing, and interface applications in industrial, automotive, and communications markets.
The MAX6715–MAX6729 family delivers ultra-low-voltage supervisory functions targeting multirail embedded systems where space, power, and reliability are critical - especially in battery-operated and thermally constrained environments.
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, with ±1.5% tolerance over the full -40°C to +85°C operating range. These values are encoded in the "SH" suffix per Maxim's Reset Voltage Threshold Suffix Guide and verified in the Electrical Characteristics table of the official datasheet.
Does the MAX6718UKSHD3-T support monitoring a third voltage rail?
No, the MAX6718UKSHD3-T is a dual-voltage supervisor and does not include RSTIN or PFI inputs. It monitors only VCC1 and VCC2. For triple-voltage supervision, consider MAX6719UKSHD3-T (with RSTIN) or MAX6728KA33D3-T (with PFI/PFO), both in the same MAX6715–MAX6729 family.
What is the function of Pin 3 (MR) on the MAX6718UKSHD3-T, and how should it be used?
Pin 3 is the active-low Manual Reset input with an internal 50kΩ pull-up to VCC1. Pulling MR low for ≥1µs forces an immediate reset assertion for the full 210ms timeout period. If unused, MR may be left floating (due to internal pull-up) or tied to VCC1. No external components are required for basic operation.
Is the reset output of the MAX6718UKSHD3-T push-pull or open-drain, and what are its drive capabilities?
The MAX6718UKSHD3-T features a push-pull active-low RST output (Pin 1) referenced to VCC1. It sources ≥0.8×VCC1 when deasserted (e.g., 3.6V at VCC1 = 4.5V) and sinks up to 3.2mA when asserted at VCC1 ≥ 4.5V. This eliminates the need for an external pull-up resistor and supports direct connection to most µP reset pins.
What is the minimum supply voltage at which the MAX6718UKSHD3-T guarantees correct reset logic behavior?
The MAX6718UKSHD3-T guarantees valid reset output logic state as long as either VCC1 or VCC2 remains ≥0.8V. This specification ensures deterministic reset assertion during brownout conditions where one rail collapses faster than the other - a critical feature for fault-tolerant power sequencing in industrial systems.
MAX6718UKSHD3-T 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-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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