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Analog Devices Inc./Maxim Integrated MAX6718UKZGD3-T
- Part No.:
- MAX6718UKZGD3-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6718UKZGD3-T.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,500
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Product details
Overview
MAX6718UKZGD3-T from Maxim Integrated is a dual-voltage microprocessor supervisory circuit in 5-pin SOT23 package, monitoring VCC1 (1.8V–5.0V) and VCC2 (0.9V–3.3V) with factory-trimmed reset thresholds (VTH1 = 2.25V, VTH2 = 0.765V), 210ms minimum reset timeout, and push-pull active-low RST output. It ensures reliable system reset during power-up, brownout, or manual intervention in battery-powered embedded controllers.
For engineers reviewing the MAX6718UKZGD3-T datasheet, MAX6718UKZGD3-T pinout, MAX6718UKZGD3-T application, or MAX6718UKZGD3-T equivalent, key selection criteria include dual-supply threshold accuracy (±1.5% over temperature), guaranteed reset validity down to VCC = 0.8V, low 14µA typical supply current at 3.6V, and compatibility with manual reset and watchdog-free designs.
Technical Context
The MAX6718UKZGD3-T implements two independent voltage comparators with internal 20ppm/°C tempco references, driving a single-shot timer that enforces a 210ms (min) reset assertion after any monitored supply recovers above its threshold. Its push-pull RST output is referenced to VCC1 and sinks up to 3.2mA at 4.5V.
No watchdog, power-fail, or RSTIN inputs are integrated - this variant supports only dual-supply monitoring with manual reset (MR) input and fixed reset timeout. The MR pin features a 50kΩ internal pullup to VCC1 and accepts TTL/CMOS logic levels.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC1 Threshold | 2.25V (typ), ±1.5% over -40°C to +85°C - sets primary supply brownout detection point for 2.5V/3.3V systems |
| VCC2 Threshold | 0.765V (typ), ±1.5% over -40°C to +85°C - enables reliable core-voltage supervision down to 0.9V supplies |
| Reset Timeout | 210ms (min) - ensures µP completes full initialization before release from reset |
| Supply Current | 14µA (typ) at 3.6V - minimizes quiescent drain in always-on battery-backed applications |
| Reset Output | Push-pull active-low RST referenced to VCC1 - eliminates need for external pullup and drives directly into µP reset pin |
| MR Input | Internal 50kΩ pullup to VCC1, 1µs minimum pulse width - supports momentary switch interface without external components |
| Operating Temp | -40°C to +85°C - qualified for industrial and extended-temperature embedded deployments |
Pinout & Package
MAX6718UKZGD3-T uses a 5-pin SOT23-5 package (2.9mm × 1.6mm × 1.1mm body, 0.95mm pitch). Pin 1 is marked with dot; pin order is standard SOT23 counterclockwise from mark.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (RST) | Active-Low Reset Output | Push-pull driver referenced to VCC1; asserts low on VCC1/VCC2 undervoltage or MR activation; holds low for 210ms min after recovery |
| 2 (GND) | Ground Reference | Common return path for all internal comparators, timer, and output drivers; must be low-impedance connection |
| 3 (MR) | Manual Reset Input | Active-low input with internal 50kΩ pullup to VCC1; resets system when pulled below 0.3×VCC1 for ≥1µs |
| 4 (VCC2) | Secondary Supply Input | Powers internal VCC2 comparator and sets secondary threshold reference; valid range 0.9V–3.3V |
| 5 (VCC1) | Primary Supply Input | Powers device core and sets primary threshold reference; valid range 1.8V–5.0V; output driver referenced to this rail |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent voltage monitoring | Simultaneous supervision of main I/O rail (VCC1) and low-voltage core rail (VCC2) with separate thresholds and hysteresis |
| Guaranteed reset validity down to 0.8V | Ensures correct RST logic state even during deep brownout - critical for fail-safe shutdown sequencing |
| Immunity to short VCC transients | Rejects glitches <20µs wide (at 100mV overdrive), preventing spurious resets in noisy power environments |
| Low-power operation | 14µA typical ICC at 3.6V enables >10-year battery life in coin-cell–powered IoT endpoints |
| Integrated MR pullup | Eliminates external resistor for pushbutton reset interface - reduces BOM count and PCB area |
Applications
| Portable/Battery-Operated Equipment | Industrial Equipment |
|---|---|
Use Scenario: Supervising dual-rail power in handheld medical monitors with 3.3V I/O and 1.2V ARM Cortex-M core. IC Role / Device Role / Timing Role: Dual-voltage supervisor asserting reset if either rail drops below threshold during battery discharge or load switching. Use Value: Prevents processor lockup during brownout by enforcing 210ms reset hold time, enabling safe state save before shutdown. | Use Scenario: Ensuring deterministic startup in programmable logic controllers with isolated 24V DC input and 3.3V/1.8V internal rails. IC Role / Device Role / Timing Role: Monitoring both primary field-side supply and secondary logic supply to guarantee clean µP boot sequence. Use Value: Push-pull RST output drives µP reset directly without pullup, reducing component count and improving noise immunity in EMI-heavy factory floors. |
| Computers/Servers | Telecom/Networking Equipment |
Use Scenario: Power sequencing validation in compact edge-server management controllers using 5V auxiliary and 3.3V main rails. IC Role / Device Role / Timing Role: Detecting undervoltage on backup power rail (VCC2) while main rail (VCC1) remains stable during AC loss events. Use Value: Factory-trimmed 2.25V/0.765V thresholds match common ATX and PMBus-compliant supply tolerances without calibration. | Use Scenario: Supervising dual supplies in small-form-factor optical line terminals with 12V input and 3.3V/1.2V DC-DC outputs. IC Role / Device Role / Timing Role: Providing fail-safe reset coordination between analog front-end and digital baseband processors during cold start. Use Value: 14µA supply current extends hold-up time of backup capacitors, allowing graceful firmware response to input dropout. |
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 | 6-pin SOT23-6, identical thresholds (2.25V/0.765V) and 210ms timeout, but includes open-drain RST output instead of push-pull | Requires external pullup resistor; suitable where level-shifting or wired-OR reset bus is needed | Select MAX6716UTLTD3-T only if open-drain topology is required for multi-source reset arbitration. |
| TPS3808G33DBVR | Single-supply supervisor (3.3V only), 200ms timeout, 1.8µA IQ, SOT23-5 - lacks VCC2 monitoring capability | Cannot supervise dual rails; limited to single-rail systems where only main supply requires monitoring | Choose TPS3808G33DBVR only for cost-sensitive single-rail applications where core voltage supervision is handled elsewhere. |
Compared with MAX6716UTLTD3-T and TPS3808G33DBVR, the MAX6718UKZGD3-T uniquely delivers dual-rail supervision in a 5-pin push-pull configuration - eliminating external components while maintaining full voltage coverage across I/O and core domains.
Availability
MAX6718UKZGD3-T is available at Aetrix Electronics and suitable for portable/battery-operated equipment, industrial equipment, and telecom/networking equipment requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6718UKZGD3-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, sensing, and connectivity applications in industrial, automotive, and computing markets.
The MAX6715–MAX6729 family was engineered specifically for ultra-low-voltage multirail systems requiring high-accuracy, low-quiescent-current supervision with minimal board space - targeting battery-constrained and thermally sensitive embedded platforms.
FAQ
What is the exact reset threshold voltage for VCC1 on the MAX6718UKZGD3-T?
The MAX6718UKZGD3-T has a factory-trimmed VCC1 reset threshold of 2.25V (typical), with guaranteed limits of 2.250V (min) to 2.375V (max) over -40°C to +85°C. This value is encoded in the "ZG" suffix per Maxim's Reset Voltage Threshold Suffix Guide and applies specifically to the MAX6718UKZGD3-T - not the broader MAX6715–MAX6729 family.
Does the MAX6718UKZGD3-T support watchdog functionality?
No, the MAX6718UKZGD3-T does not include a watchdog timer. Per Maxim's Selector Guide, only MAX6721 through MAX6729 variants integrate WDI. The MAX6718UKZGD3-T is a dual-supply supervisor with manual reset (MR) input and fixed 210ms reset timeout - no watchdog input or related timing circuitry is present.
What is the function of Pin 4 (VCC2) on the MAX6718UKZGD3-T?
Pin 4 (VCC2) on the MAX6718UKZGD3-T is the secondary supply input, powering the internal comparator for VCC2 monitoring and setting the 0.765V (typ) reset threshold. It accepts voltages from 0.9V to 3.3V and must be connected to the system's core or auxiliary rail - it is not optional or bypassable, as the device requires both VCC1 and VCC2 to operate correctly.
Can the MAX6718UKZGD3-T monitor a third voltage rail?
No, the MAX6718UKZGD3-T is a dual-voltage supervisor and does not support triple-voltage monitoring. Variants like MAX6719/MAX6720 include RSTIN for adjustable third-rail supervision, but the MAX6718UKZGD3-T lacks the RSTIN pin and associated comparator - its pinout and internal architecture are strictly limited to VCC1 and VCC2 inputs.
What is the maximum sink current capability of the RST output on the MAX6718UKZGD3-T?
The RST output on the MAX6718UKZGD3-T is a push-pull driver referenced to VCC1 and can sink up to 3.2mA when VCC1 ≥ 4.5V (VOL ≤ 0.4V), or 1.2mA when VCC1 ≥ 2.7V (VOL ≤ 0.3V). This allows direct interfacing with most µP reset inputs without external pullup resistors - a key design advantage over open-drain alternatives like the MAX6716UTLTD3-T.
MAX6718UKZGD3-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:
- 1.11V, 2.313V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
MAX6718UKZGD3-T FAQ
1.How can I place an order for MAX6718UKZGD3-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6718UKZGD3-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 MAX6718UKZGD3-T reliable?
The price and inventory of MAX6718UKZGD3-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6718UKZGD3-T is usually 5 days.
3.What payment methods are accepted for MAX6718UKZGD3-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6718UKZGD3-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6718UKZGD3-T?
MAX6718UKZGD3-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6718UKZGD3-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 MAX6718UKZGD3-T?
For technical support, including MAX6718UKZGD3-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6718UKZGD3-T requirements.
6.How does Aetrix verify that MAX6718UKZGD3-T is sourced from the original manufacturer or authorized distributors?
All MAX6718UKZGD3-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 MAX6718UKZGD3-T meets industry standards.
7.What is the process for return or replacement of MAX6718UKZGD3-T?
All MAX6718UKZGD3-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6718UKZGD3-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 MAX6718UKZGD3-T part is unused and in its original packaging.
Return procedure for MAX6718UKZGD3-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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