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Analog Devices Inc./Maxim Integrated MAX6318LHUK31CY-T
- Part No.:
- MAX6318LHUK31CY-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6318LHUK31CY-T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,588
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Product details
Overview
MAX6318LHUK31CY-T from Maxim Integrated is a 5-pin SOT23 microprocessor supervisory circuit with active-low push/pull reset output, manual reset input, and watchdog timer. It features a factory-trimmed 3.08V reset threshold (±2.5% over -40°C to +125°C), 140ms minimum reset timeout, and 1.6s typical watchdog timeout. Used in embedded control systems to prevent code-execution errors during power-up, brownout, or software lockup.
For engineers reviewing the MAX6318LHUK31CY-T datasheet, MAX6318LHUK31CY-T pinout, MAX6318LHUK31CY-T application, or MAX6318LHUK31CY-T equivalent, key selection criteria include reset threshold accuracy at temperature extremes, guaranteed reset validity down to VCC = 1V, bidirectional compatibility with legacy μP reset protocols, and AEC-Q100 qualification for automotive-adjacent industrial use.
Technical Context
The MAX6318LHUK31CY-T integrates a precision voltage detector, programmable reset timer, and edge-triggered watchdog circuit. Its reset generator asserts active-low RESET when VCC falls below 3.08V, after MR low-to-high transition, or upon WDI timeout - holding output active for ≥140ms after recovery. The watchdog clears on any WDI edge (≥50ns pulse width) and supports timeout periods of 6.3ms–25.6s.
This variant belongs to the LH suffix group: it combines active-low push/pull RESET output with manual reset (MR) input but excludes watchdog functionality (WDI pin present but unused per Selector Guide). Its internal 52kΩ MR pullup and guaranteed RESET validity to VCC = 1V enable robust operation in battery-powered and low-voltage systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 3.08V nominal (2.5% tolerance over -40°C to +125°C); ensures reliable reset assertion during 3.3V supply brownout. |
| Reset Timeout Period | 140ms minimum; guarantees sufficient hold time for μP initialization before release. |
| Supply Current | 5µA typical at VCC = 3.6V; enables multi-year operation in coin-cell–powered portable instruments. |
| Operating Voltage Range | 1.0V to 5.5V; supports valid reset signaling even during deep brownout or partial power loss. |
| Reset Output Type | Active-low, push/pull CMOS; drives high/low without external components and sinks ≥1.2mA at VCC ≥ 2.7V. |
| Temperature Range | -40°C to +125°C; qualified for under-hood automotive electronics and industrial control environments. |
| AEC-Q100 Grade | Qualified per AEC-Q100 Rev H; meets stress testing requirements for automotive-grade reliability. |
Pinout & Package
MAX6318LHUK31CY-T is housed in a 5-pin SOT23 package (package code U5+2A, outline 21-0057), measuring 2.9mm × 1.6mm × 1.1mm with gull-wing leads. This RoHS-compliant, surface-mount package enables high-density PCB layouts and reflow-compatible assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Active-low push/pull reset output; asserts logic low during fault conditions and releases cleanly after timeout. |
| 2 | GND | Ground reference for all internal comparators and timing circuits; must be low-impedance connection. |
| 3 | MR | Manual reset input; active-low signal forces reset for full timeout period; internally pulled up to VCC via 52kΩ. |
| 4 | WDI | Watchdog input pin; unused in LH variants but electrically present; must be left open or tied to VCC/GND per design. |
| 5 | VCC | Supply voltage input; powers all internal circuitry and defines reset threshold reference point. |
Key Features
| Feature | Design Value |
|---|---|
| No external components required | Integrated voltage reference, timing capacitor, and pullup resistors eliminate BOM cost and layout area. |
| Guaranteed reset validity to VCC = 1V | Ensures deterministic reset behavior during severe brownout-critical for data integrity in flash memory writes. |
| Immunity to short negative VCC transients | Rejects ≤4µs, 100mV-under-threshold glitches-prevents spurious resets in noisy power environments. |
| Factory-trimmed precision threshold | 3.08V ±2.5% over full temperature range eliminates need for calibration or trimming in production. |
| SOT23-5 footprint compatibility | Standardized 5-pin layout allows drop-in replacement across MAX6316–MAX6322 family variants. |
Applications
| Portable/Battery-Powered Equipment | Embedded Control Systems |
|---|---|
Use Scenario: Long-life handheld meter with lithium coin-cell supply subject to gradual voltage decay. IC Role / Device Role / Timing Role: Supervisory IC monitors VCC and asserts RESET before supply drops below μP operational minimum. Use Value: Prevents corrupted EEPROM writes and undefined state during undervoltage; extends usable battery life by 12–18%. |
Use Scenario: Industrial PLC module requiring deterministic boot sequence after power interruption. IC Role / Device Role / Timing Role: Generates clean, timed reset pulse synchronized to VCC recovery and MR deassertion. Use Value: Eliminates race conditions between FPGA configuration and microcontroller startup; reduces field failure rate by >90%. |
| Intelligent Instruments | Controllers |
Use Scenario: Portable oscilloscope with real-time waveform capture and nonvolatile settings storage. IC Role / Device Role / Timing Role: Ensures μP remains held in reset until analog front-end biasing stabilizes post-power-on. Use Value: Avoids ADC offset drift and DAC calibration errors during power ramp; improves measurement repeatability to ±0.05%. |
Use Scenario: HVAC zone controller operating in unconditioned attic space with wide ambient temperature swings. IC Role / Device Role / Timing Role: Provides temperature-stable reset assertion across -40°C to +125°C junction range. Use Value: Guarantees firmware reload on cold start; prevents lockup during summer thermal cycling events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6318MHUK31CY-T | Bidirectional active-low RESET output instead of push/pull; includes internal 4.7kΩ pullup + active P-FET. | Required for Motorola 68HC11–class μPs with bidirectional reset I/O; not compatible with standard push/pull-only reset inputs. | Select MH variant only when interfacing with legacy bidirectional-reset microcontrollers; otherwise, LH provides simpler interface. |
| TLV803EB30DBZR | Single-function reset IC with 3.0V threshold, no MR or WDI; SOT23-3 package (3 pins, no WDI/MR). | Lacks manual reset and watchdog features; suitable only for basic power-monitoring applications without system-level fault recovery. | Choose TLV803EB30DBZR for cost-sensitive, space-constrained designs where MR and watchdog are unnecessary. |
Compared with MAX6318MHUK31CY-T, the MAX6318LHUK31CY-T offers simpler push/pull drive and lower system-level timing uncertainty, while TLV803EB30DBZR sacrifices configurability for minimal footprint and bill-of-materials reduction-making each appropriate for distinct architecture tiers.
Availability
MAX6318LHUK31CY-T is available at Aetrix Electronics and suitable for portable/battery-powered equipment, embedded control systems, and intelligent instruments requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6318LHUK31CY-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, and communications applications, emphasizing high reliability and low-power operation.
The MAX6316–MAX6322 family targets microprocessor supervision in resource-constrained, safety-critical systems-delivering factory-trimmed accuracy, wide temperature operation, and integrated fault-recovery features in miniature packages.
FAQ
What is the exact reset threshold voltage of MAX6318LHUK31CY-T and how does it vary with temperature?
The MAX6318LHUK31CY-T has a factory-trimmed nominal reset threshold of 3.08V, with tolerance of ±2.5% over the full operating range of -40°C to +125°C. Its temperature coefficient is 40ppm/°C, meaning drift is limited to ±0.012V across the entire range. This precision eliminates need for external calibration and ensures consistent brownout detection in thermally demanding applications like automotive engine control modules.
Does MAX6318LHUK31CY-T include watchdog functionality, and how is the WDI pin used?
No, the MAX6318LHUK31CY-T does not implement watchdog functionality-the "LH" suffix indicates active-low push/pull RESET with manual reset (MR) but no watchdog timer. The WDI pin is physically present but unused; it may be left floating, tied to VCC, or grounded without affecting operation. This distinguishes it from "LW", "LX", "LY", or "LZ" variants which activate the watchdog with corresponding timeout periods.
Can MAX6318LHUK31CY-T operate reliably below 2.5V supply voltage?
Yes, MAX6318LHUK31CY-T is guaranteed to assert and maintain valid RESET output down to VCC = 1.0V, per Absolute Maximum Ratings and Electrical Characteristics. Its internal circuitry remains functional and monotonic throughout this range, enabling safe shutdown sequencing and data retention in ultra-low-power systems such as energy-harvesting sensors and backup power domains.
What is the purpose of the MR pin on MAX6318LHUK31CY-T and how should it be interfaced?
The MR pin on MAX6318LHUK31CY-T is an active-low manual reset input that forces RESET assertion for the full 140ms timeout period upon low-to-high transition. It features an internal 52kΩ pullup to VCC, allowing direct connection to a momentary switch (to GND) without external components. MR accepts TTL- or CMOS-level signals and rejects <100ns noise pulses-making it ideal for front-panel reset buttons and system-level fault recovery triggers.
Is MAX6318LHUK31CY-T qualified for automotive applications?
Yes, MAX6318LHUK31CY-T is AEC-Q100 qualified (Grade 1: -40°C to +125°C), meeting stress test requirements for automotive electronic components. While not designated with "/V" suffix (which denotes full automotive PPAP compliance), its qualification covers thermal cycling, humidity, ESD, and accelerated life testing-making it suitable for under-dash infotainment, ADAS auxiliary modules, and body electronics where extended temperature and reliability are mandatory.
MAX6318LHUK31CY-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:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 3.08V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active High/Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
MAX6318LHUK31CY-T FAQ
1.How can I place an order for MAX6318LHUK31CY-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6318LHUK31CY-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 MAX6318LHUK31CY-T reliable?
The price and inventory of MAX6318LHUK31CY-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6318LHUK31CY-T is usually 5 days.
3.What payment methods are accepted for MAX6318LHUK31CY-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6318LHUK31CY-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6318LHUK31CY-T?
MAX6318LHUK31CY-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6318LHUK31CY-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 MAX6318LHUK31CY-T?
For technical support, including MAX6318LHUK31CY-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6318LHUK31CY-T requirements.
6.How does Aetrix verify that MAX6318LHUK31CY-T is sourced from the original manufacturer or authorized distributors?
All MAX6318LHUK31CY-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 MAX6318LHUK31CY-T meets industry standards.
7.What is the process for return or replacement of MAX6318LHUK31CY-T?
All MAX6318LHUK31CY-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6318LHUK31CY-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 MAX6318LHUK31CY-T part is unused and in its original packaging.
Return procedure for MAX6318LHUK31CY-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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