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Analog Devices Inc./Maxim Integrated MAX6318LHUK31AY-T
- Part No.:
- MAX6318LHUK31AY-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6318LHUK31AY-T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,289
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Product details
Overview
MAX6318LHUK31AY-T from Maxim Integrated is a 5-pin SOT23 microprocessor supervisory circuit with active-low push/pull reset output, manual reset input (MR), and watchdog timer (WDI). 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. Designed for embedded control systems requiring reliable power-on reset and software fault recovery.
For engineers reviewing the MAX6318LHUK31AY-T datasheet, MAX6318LHUK31AY-T pinout, MAX6318LHUK31AY-T application, or MAX6318LHUK31AY-T equivalent, key selection criteria include reset threshold accuracy at temperature extremes, guaranteed reset validity down to VCC = 1V, bidirectional reset compatibility (not applicable-this part uses push/pull), and AEC-Q100 qualification for automotive-adjacent industrial use.
Technical Context
The MAX6318LHUK31AY-T integrates a precision voltage detector, 140ms reset timeout counter, and 1.6s watchdog timer with edge-triggered WDI input. Its reset generator asserts active-low RESET when VCC falls below 3.08V, after MR low-to-high transition, or upon WDI timeout - holding RESET low for ≥140ms after VCC recovery.
It employs laser-trimmed internal resistors for ±2.5% reset threshold tolerance across -40°C to +125°C and guarantees valid reset output down to VCC = 1V. The push/pull output drives high/low actively (VOH ≥ 0.8×VCC at ISOURCE = 500µA; VOL ≤ 0.4V at ISINK = 3.2mA), eliminating need for external pullups.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 3.08V nominal (factory-trimmed), ±2.5% over -40°C to +125°C - ensures deterministic brownout detection across automotive/industrial temperature range |
| Reset Timeout Period | 140ms minimum - guarantees sufficient hold time for microprocessor initialization before release |
| Watchdog Timeout | 1.6s typical - provides robust software execution monitoring without excessive false triggers |
| Supply Current | 5µA typical at VCC = 3.6V - enables ultra-low-power operation in battery-backed systems |
| Operating Voltage Range | 1.0V to 5.5V - supports valid reset assertion even during deep brownout conditions |
| Reset Output Type | Active-low, push/pull - eliminates external components and ensures fast, rail-to-rail drive capability |
| Package | SOT23-5 (U5+2A) - 2.9mm × 1.6mm footprint ideal for space-constrained PCB layouts |
Pinout & Package
MAX6318LHUK31AY-T is housed in a RoHS-compliant 5-pin SOT23 package (package code U5+2A, outline 21-0057), with thermal resistance θJA = 255.9°C/W on multilayer board.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Active-low push/pull reset output - sinks up to 3.2mA and sources up to 800µA; asserts low during power failure, MR activation, or watchdog timeout |
| 2 | GND | Ground reference - common return path for all internal circuits and reset output |
| 3 | MR | Active-low manual reset input - pulled high internally via 52kΩ resistor; low pulse ≥1.5µs at -40°C to +125°C forces reset |
| 4 | WDI | Watchdog input - edge-sensitive (rising/falling); must be toggled within 1.6s to prevent reset; left unconnected to disable watchdog |
| 5 | VCC | Supply voltage input - monitored for reset threshold violation; operates from 1.0V to 5.5V |
Key Features
| Feature | Design Value |
|---|---|
| No external components required | Integrated voltage reference, timing capacitors, and pullup/pulldown circuitry eliminate BOM cost and layout area |
| Guaranteed reset validity to VCC = 1V | Ensures deterministic system behavior during deep undervoltage events, critical for fail-safe embedded control |
| AEC-Q100 qualified | Validated for automotive-grade reliability (Grade 2: -40°C to +105°C ambient), supporting industrial and transportation applications |
| Immunity to short negative VCC transients | Rejects <4µs, 100mV-under-threshold glitches - prevents spurious resets in electrically noisy environments |
| Factory-trimmed precision threshold | 3.08V ±2.5% over full temperature range - removes need for calibration or trimming in production |
Applications
| Industrial PLC Controller | Automotive Body Control Module |
|---|---|
Use Scenario: Monitors 3.3V supply in programmable logic controller with ARM Cortex-M7 MCU and CAN interface. IC Role / Device Role / Timing Role: Provides power-on reset, manual reset via front-panel button, and software watchdog supervision of firmware execution. Use Value: Prevents corrupted state machine startup during cold crank; 140ms timeout matches MCU boot ROM requirements; AEC-Q100 rating supports under-hood deployment. |
Use Scenario: Supervises 5V domain powering door lock actuators, window lift drivers, and LIN transceivers. IC Role / Device Role / Timing Role: Generates clean reset signal during battery voltage sag (e.g., starter motor engagement), with MR for service mode entry. Use Value: 3.08V threshold aligns with automotive 12V system brownout profile; immunity to 200ns VCC glitches avoids false resets during load dump transients. |
| Medical Infusion Pump | Smart Energy Meter |
Use Scenario: Ensures safe restart of safety-critical dosing controller after AC power interruption or battery switchover. IC Role / Device Role / Timing Role: Delivers fail-safe reset with 140ms hold time and watchdog supervision of motor control loop. Use Value: Valid reset down to VCC = 1V guarantees controlled shutdown during gradual battery depletion; low 5µA ICC extends backup runtime. |
Use Scenario: Supervises metrology SoC and secure element in ANSI C12.22-compliant electricity meter with supercapacitor backup. IC Role / Device Role / Timing Role: Detects 3.3V rail collapse during grid outage and initiates graceful data save before power loss. Use Value: Factory-trimmed 3.08V threshold provides precise margin above 3.0V brownout level; SOT23-5 footprint fits tight meter PCB real estate. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6318MHUK31AY-T | Bidirectional (not push/pull) reset output; includes internal 4.7kΩ pullup + active P-FET for fast rise time on shared reset bus | Required for Motorola 68HC11 or other µPs with bidirectional reset I/O; incompatible with standard push/pull-only reset inputs | Select MAX6318MHUK31AY-T only when interfacing with bidirectional-reset microcontrollers; otherwise MAX6318LHUK31AY-T is preferred for simplicity and lower drive complexity |
| TPS3808G33DBVR | 3.3V fixed reset threshold (not 3.08V); 200ms reset timeout; no manual reset input; 3.5µA ICC at 3.6V | Lacks MR pin and adjustable threshold - suitable only for fixed-voltage systems without field-service reset capability | Choose TPS3808G33DBVR for cost-sensitive, single-threshold designs where MR functionality is unnecessary and 3.3V alignment is acceptable |
Compared with MAX6318MHUK31AY-T, MAX6318LHUK31AY-T offers simpler push/pull drive and eliminates bidirectional timing constraints; versus TPS3808G33DBVR, it provides manual reset flexibility and tighter 3.08V threshold for systems requiring margin below 3.3V rails.
Availability
MAX6318LHUK31AY-T is available at Aetrix Electronics and suitable for industrial PLC controllers, automotive body control modules, medical infusion pumps, and smart energy meters requiring stable component supply with AEC-Q100 traceability and long-term lifecycle support.
Supply support for MAX6318LHUK31AY-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 reliability, integration, and low-power operation.
The MAX6316–MAX6322 family delivers highly configurable µP supervisory functions - including selectable reset thresholds, timeout periods, and output types - specifically for embedded systems demanding robust power monitoring and fault recovery.
FAQ
What is the exact reset threshold voltage of MAX6318LHUK31AY-T and how does it vary with temperature?
The MAX6318LHUK31AY-T has a factory-trimmed nominal reset threshold of 3.08V, with tolerance of ±2.5% over the full operating temperature range (-40°C to +125°C). At +25°C, the threshold is guaranteed between 3.003V and 3.157V. Temperature coefficient is 40ppm/°C, contributing to predictable drift across thermal extremes without requiring external compensation.
Does MAX6318LHUK31AY-T include a manual reset input, and what are its electrical requirements?
Yes, MAX6318LHUK31AY-T includes an active-low manual reset (MR) input. It features an internal 52kΩ pullup resistor, allowing MR to be left unconnected when unused. A low pulse ≥1.5µs (at -40°C to +125°C) forces reset assertion for the full 140ms timeout period. MR accepts TTL/CMOS logic levels and rejects transients <100ns.
Can the watchdog function of MAX6318LHUK31AY-T be disabled, and how is this accomplished?
Yes, the watchdog function of MAX6318LHUK31AY-T can be disabled by leaving the WDI pin unconnected. When open, the internal watchdog timer is automatically serviced at intervals equal to 7/8 of the nominal timeout period (i.e., ~1.4s), preventing unintended reset assertion. No external pullup or pulldown is required.
What is the maximum supply voltage the MAX6318LHUK31AY-T can tolerate on its VCC pin?
The MAX6318LHUK31AY-T supports an absolute maximum VCC of +6V, though its functional operating range is specified from 1.0V to 5.5V. Operation above 5.5V risks permanent damage per Absolute Maximum Ratings. For systems with transient overvoltage risk, a series resistor or TVS diode is recommended on the VCC line.
Is MAX6318LHUK31AY-T compatible with microcontrollers that require an active-high reset signal?
No, MAX6318LHUK31AY-T provides only an active-low push/pull reset output. For active-high reset requirements, consider the pin-compatible MAX6318HHUK31AY-T (active-high variant) or use an external inverter. The "H" suffix in the part number denotes active-high output; "LH" explicitly indicates active-low with manual reset and watchdog.
MAX6318LHUK31AY-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:
- 1ms Minimum
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
MAX6318LHUK31AY-T FAQ
1.How can I place an order for MAX6318LHUK31AY-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6318LHUK31AY-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 MAX6318LHUK31AY-T reliable?
The price and inventory of MAX6318LHUK31AY-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6318LHUK31AY-T is usually 5 days.
3.What payment methods are accepted for MAX6318LHUK31AY-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6318LHUK31AY-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6318LHUK31AY-T?
MAX6318LHUK31AY-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6318LHUK31AY-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 MAX6318LHUK31AY-T?
For technical support, including MAX6318LHUK31AY-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6318LHUK31AY-T requirements.
6.How does Aetrix verify that MAX6318LHUK31AY-T is sourced from the original manufacturer or authorized distributors?
All MAX6318LHUK31AY-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 MAX6318LHUK31AY-T meets industry standards.
7.What is the process for return or replacement of MAX6318LHUK31AY-T?
All MAX6318LHUK31AY-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6318LHUK31AY-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 MAX6318LHUK31AY-T part is unused and in its original packaging.
Return procedure for MAX6318LHUK31AY-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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