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Analog Devices Inc./Maxim Integrated MAX6318LHUK46CY+T
- Part No.:
- MAX6318LHUK46CY+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6318LHUK46CY+T.pdf
- Description:
- IC MPU/RESET CIRC 4.63V SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,450
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Product details
Overview
MAX6318LHUK46CY+T from Maxim Integrated is a 5-pin SOT23 microprocessor supervisory IC with active-low push/pull reset output, 4.63V factory-trimmed reset threshold, 140ms minimum reset timeout, and 1.6s typical watchdog timeout. It monitors VCC supply integrity and provides reset assertion during power-up, brownout, or software lockup in embedded controllers and portable instrumentation.
For engineers reviewing the MAX6318LHUK46CY+T datasheet, MAX6318LHUK46CY+T pinout, MAX6318LHUK46CY+T application, or MAX6318LHUK46CY+T equivalent, key selection criteria include guaranteed reset validity down to VCC = 1V, immunity to short negative VCC transients (<4µs at 100mV under threshold), bidirectional reset compatibility (though not applicable to this variant), and AEC-Q100 qualification for automotive-adjacent industrial use.
Technical Context
The MAX6318LHUK46CY+T implements a precision voltage monitor with laser-trimmed resistive divider setting VRST = 4.63V ±2.5% over –40°C to +125°C, combined with a digital reset timer generating 140ms minimum active-low reset pulse after VCC recovery. Its watchdog circuit requires WDI edge transitions within 1.6s (typ) to prevent reset assertion.
This variant lacks manual reset (MR) input and bidirectional reset capability-confirmed by Selector Guide and Pin Description tables-and uses only VCC, GND, WDI, and RESET pins in its 5-pin SOT23 package. Reset output is CMOS push/pull, sourcing/sinking current with VOL ≤0.3V at ISINK = 1.2mA (VCC ≥2.7V) and VOH ≥0.8×VCC at ISOURCE = 500µA (VCC ≥2.7V).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.63V ±2.5% over –40°C to +125°C - ensures reliable detection of 5V rail brownout before system instability |
| Reset Timeout | 140ms minimum - guarantees sufficient hold time for microcontroller initialization after power recovery |
| Watchdog Timeout | 1.6s typical - provides robust software execution monitoring without excessive false triggers |
| Supply Current | 5µA typ at VCC = 3.6V - enables battery-powered operation with minimal quiescent drain |
| Operating Temp | –40°C to +125°C - supports deployment in automotive engine compartments and industrial control enclosures |
| Reset Output Type | Active-Low Push/Pull - drives reset line directly without external pullup, compatible with standard µP reset inputs |
| VCC Range | 1.0V to 5.5V - maintains valid reset assertion even during deep brownout conditions |
Pinout & Package
MAX6318LHUK46CY+T is housed in a RoHS-compliant 5-pin SOT23 package (package code U5+2A, outline 21-0057), measuring 2.9mm × 1.6mm × 1.1mm with gull-wing leads. Thermal resistance θJA is 255.9°C/W on multilayer board.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Active-low CMOS push/pull output - asserts logic low during fault; sinks 1.2mA @ VCC ≥2.7V, sources 500µA @ VCC ≥2.7V |
| 2 | GND | Ground reference - must be connected to system ground plane for accurate threshold sensing and noise immunity |
| 3 | WDI | Watchdog input - requires rising/falling edge every 1.6s (typ) to prevent reset; internally serviced if left unconnected |
| 4 | NC | No connect - pin 4 is unused and must remain floating per datasheet; no internal connection or bond wire |
| 5 | VCC | Supply input - powers internal circuitry; reset asserted when voltage falls below 4.63V threshold |
Key Features
| Feature | Design Value |
|---|---|
| Factory-trimmed reset threshold | 4.63V with ±2.5% tolerance over full temperature range - eliminates need for external resistor network calibration |
| Guaranteed reset validity to VCC = 1V | Ensures deterministic reset behavior during deep undervoltage events where other supervisors fail |
| Immunity to short VCC transients | Rejects <4µs negative glitches at 100mV below threshold - prevents spurious resets in noisy power environments |
| AEC-Q100 qualified | Validated for automotive-grade reliability (Grade 2: –40°C to +105°C ambient) - suitable for under-hood and infotainment systems |
| No external components required | Integrates voltage reference, comparator, timer, and output driver - reduces BOM count and PCB area vs discrete solutions |
Applications
| Industrial PLC Controller | Portable Medical Monitor |
|---|---|
Use Scenario: Monitors 5V supply in programmable logic controller rack during mains fluctuation or backup battery switchover. IC Role / Device Role / Timing Role: Supervisory IC asserting active-low reset to ARM Cortex-M7 MCU upon VCC dip below 4.63V, holding reset for ≥140ms post-recovery. Use Value: Prevents corrupted I/O register writes during brownout by guaranteeing reset persistence beyond MCU boot ROM timing requirements. | Use Scenario: Ensures safe startup and fault recovery in handheld ECG device powered by single-cell Li-ion battery (3.0–4.2V nominal). IC Role / Device Role / Timing Role: Voltage supervisor triggering reset when battery sags below 4.63V during high-current pulse acquisition, with 1.6s watchdog guarding firmware execution. Use Value: Eliminates risk of sensor data corruption or display freeze by enforcing hard reset before analog front-end ADC enters undefined state. |
| Automotive Body Control Module | Smart Energy Meter |
Use Scenario: Embedded in BCM managing door locks, lighting, and HVAC; exposed to load-dump and cold-crank transients. IC Role / Device Role / Timing Role: AEC-Q100-qualified supervisor asserting reset during cold-crank (VCC dips to 3.2V) and verifying firmware liveness via WDI toggling. Use Value: Meets ISO 16750-2 transient immunity requirements while enabling diagnostic logging of reset cause (power vs. watchdog). | Use Scenario: Used in DIN-rail mounted meter with isolated RS-485 interface and real-time clock, operating continuously for 15+ years. IC Role / Device Role / Timing Role: Provides long-term supply monitoring with 4.63V threshold aligned to 5V LDO output, using 140ms reset timeout to accommodate RTC capacitor recharge delay. Use Value: Guarantees meter firmware restarts cleanly after grid outage without EEPROM write corruption due to insufficient hold-up time. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6318MHUK46CY+T | Bidirectional active-low reset output instead of push/pull; includes internal 4.7kΩ pullup + active P-FET | Required for Motorola 68HC11 or similar µPs needing bidirectional reset bus arbitration | Select only if target MCU has bidirectional reset pin; otherwise MAX6318LHUK46CY+T offers simpler interface and lower cost |
| TLV809K46DBVR | Single-function reset IC (no watchdog); 4.63V threshold; SOT23-3 package; 240ms reset timeout | Lacks WDI input and manual reset - suitable only for basic power-on reset without software supervision | Choose when watchdog functionality is unnecessary and PCB space is constrained (3-pin vs 5-pin) |
Compared with MAX6318MHUK46CY+T, the MAX6318LHUK46CY+T simplifies design by eliminating bidirectional timing constraints and reducing external component count; versus TLV809K46DBVR, it adds critical watchdog protection for safety-critical firmware but requires two additional PCB pads and routing.
Availability
MAX6318LHUK46CY+T is available at Aetrix Electronics and suitable for industrial PLC controllers, portable medical monitors, automotive body control modules, and smart energy meters requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6318LHUK46CY+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 computing applications, emphasizing high reliability and low-power operation.
The MAX6316–MAX6322 family delivers integrated power-supply monitoring and watchdog supervision for microcontrollers in harsh environments, targeting applications where deterministic reset behavior and long-term stability are non-negotiable.
FAQ
What is the exact reset threshold voltage of the MAX6318LHUK46CY+T and how does it vary with temperature?
The MAX6318LHUK46CY+T has a factory-trimmed nominal reset threshold of 4.63V, specified as ±2.5% over the full operating temperature range of –40°C to +125°C. At +25°C, the threshold is tighter: 4.561V (min) to 4.699V (max). Temperature coefficient is 40ppm/°C, meaning drift is linear and predictable - critical for systems operating near the 5V rail margin.
Does the MAX6318LHUK46CY+T include a manual reset (MR) input?
No, the MAX6318LHUK46CY+T does not feature a manual reset input. Per the Selector Guide and Pin Description tables, MR is absent in all MAX6318 variants - only MAX6316, MAX6317, MAX6319, MAX6320, and MAX6322 include MR. This simplifies layout but requires external hardware or firmware mechanisms for user-initiated reset.
How does the watchdog function behave if the WDI pin is left unconnected on the MAX6318LHUK46CY+T?
When WDI is unconnected, the MAX6318LHUK46CY+T internally services the watchdog timer at intervals equal to 7/8 of the nominal timeout period (i.e., ~1.4s for the 1.6s variant), preventing unintended reset assertion. This allows safe watchdog disablement without adding external pullup/down components - verified in Electrical Characteristics section Note 6.
What is the maximum supply voltage the MAX6318LHUK46CY+T can tolerate on its VCC pin?
The MAX6318LHUK46CY+T has an absolute maximum VCC rating of +6V, as stated in Absolute Maximum Ratings. However, functional operation is guaranteed only from 1.0V to 5.5V. Exceeding 5.5V risks permanent damage, and operation above 5.5V is neither characterized nor recommended - especially important in systems with transient-prone 5V rails.
Is the MAX6318LHUK46CY+T pin-compatible with other devices in the MAX6316–MAX6322 family?
Yes, all MAX6316–MAX6322 devices share identical 5-pin SOT23 pinouts, including MAX6318LHUK46CY+T. Pin 1 is RESET, Pin 2 is GND, Pin 3 is WDI, Pin 4 is NC (no connect), and Pin 5 is VCC. This allows direct substitution between variants - e.g., upgrading to MAX6318MHUK46CY+T requires only firmware and schematic updates, not PCB redesign.
MAX6318LHUK46CY+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:
- Active
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 4.63V
- 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
MAX6318LHUK46CY+T FAQ
1.How can I place an order for MAX6318LHUK46CY+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6318LHUK46CY+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 MAX6318LHUK46CY+T reliable?
The price and inventory of MAX6318LHUK46CY+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6318LHUK46CY+T is usually 5 days.
3.What payment methods are accepted for MAX6318LHUK46CY+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6318LHUK46CY+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6318LHUK46CY+T?
MAX6318LHUK46CY+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6318LHUK46CY+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 MAX6318LHUK46CY+T?
For technical support, including MAX6318LHUK46CY+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6318LHUK46CY+T requirements.
6.How does Aetrix verify that MAX6318LHUK46CY+T is sourced from the original manufacturer or authorized distributors?
All MAX6318LHUK46CY+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 MAX6318LHUK46CY+T meets industry standards.
7.What is the process for return or replacement of MAX6318LHUK46CY+T?
All MAX6318LHUK46CY+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6318LHUK46CY+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 MAX6318LHUK46CY+T part is unused and in its original packaging.
Return procedure for MAX6318LHUK46CY+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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