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Analog Devices Inc./Maxim Integrated MAX6318LHUK29CY+T
- Part No.:
- MAX6318LHUK29CY+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6318LHUK29CY+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,488
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Product details
Overview
MAX6318LHUK29CY+T from Maxim Integrated is a 5-pin SOT23 microprocessor supervisory circuit with active-high push/pull reset output, 2.93V 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 hang conditions in embedded control systems.
For engineers reviewing the MAX6318LHUK29CY+T datasheet, MAX6318LHUK29CY+T pinout, MAX6318LHUK29CY+T application, or MAX6318LHUK29CY+T equivalent, key selection criteria include its AEC-Q100 qualification, guaranteed reset validity down to VCC = 1V, immunity to short negative VCC transients, and integrated bidirectional-compatible reset architecture without external components.
Technical Context
The MAX6318LHUK29CY+T implements a precision voltage monitor with laser-trimmed resistor divider setting VRST = 2.93V ±2.5% over -40°C to +125°C. Its reset generator asserts RESET high for ≥140ms after VCC rises above threshold, with propagation delay <200µs during VCC fall.
It features a watchdog timer cleared by rising/falling edges on WDI (pulse width ≥50ns), with internal servicing if WDI is unconnected. The active-high push/pull RESET output sources/sinks current and remains valid down to VCC = 1V, supporting robust reset signaling in low-voltage microcontroller systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.93V ±2.5% (factory-trimmed; ensures reliable detection of 3.3V rail brownout) |
| Reset Timeout Period | 140ms minimum (guarantees sufficient hold time for μP initialization) |
| Watchdog Timeout | 1.6s typical (enables monitoring of longer firmware execution loops) |
| Supply Current | 5–12µA at VCC = 3.6V (ultra-low quiescent current for battery-powered operation) |
| Operating Temperature | -40°C to +125°C (supports automotive and industrial ambient environments) |
| Reset Output Type | Active-high push/pull (drives high/low directly; no external pullup required) |
| AEC-Q100 Qualified | Yes (meets automotive reliability and stress testing requirements) |
Pinout & Package
MAX6318LHUK29CY+T is housed in a RoHS-compliant 5-pin SOT23 package (package code U5+2A, outline 21-0057), with 0.95mm pitch, 2.9mm × 1.6mm footprint, and thermal resistance θJA = 255.9°C/W on multilayer board.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Active-high push/pull reset output; drives high to VCC or low to GND; valid down to VCC = 1V |
| 2 | GND | Ground reference for all internal circuitry and reset timing accuracy |
| 3 | MR | Active-low manual reset input; internally pulled up to VCC via 52kΩ; asserts reset when pulled low |
| 4 | WDI | Watchdog input; reset triggered if no edge occurs within 1.6s; disabled when left floating |
| 5 | VCC | Supply input (1.0V–5.5V); reset asserted when VCC falls below 2.93V |
Key Features
| Feature | Design Value |
|---|---|
| No external components required | Integrated voltage reference, reset timer, and watchdog logic eliminate discrete RC networks and reduce BOM count |
| Guaranteed reset validity to VCC = 1V | Ensures deterministic reset behavior during deep brownout or ultra-low-power wake-up sequences |
| Immunity to short negative VCC transients | Rejects ≤4µs, 100mV-under-threshold glitches-prevents spurious resets in noisy power environments |
| AEC-Q100 qualified | Validated for automotive applications including engine control, body electronics, and ADAS subsystems |
| Factory-trimmed precision threshold | 2.93V ±2.5% over full temperature range eliminates calibration overhead in production test |
Applications
| Automotive Engine Control Unit (ECU) | Industrial PLC I/O Module |
|---|---|
|
Use Scenario: Monitors 3.3V microcontroller supply in diesel ECU exposed to load-dump and cold-crank transients. IC Role / Device Role / Timing Role: Supervisory circuit asserting active-high reset to ARM Cortex-M7 core during VCC dip below 2.93V. Use Value: Prevents corrupted flash writes or register misconfiguration during 12V system voltage sag; 140ms timeout ensures full MCU boot sequence completion. |
Use Scenario: Embedded controller in DIN-rail mounted PLC managing analog sensor inputs and relay outputs. IC Role / Device Role / Timing Role: Resets TI MSP430F5xx MCU upon brownout or watchdog timeout caused by electromagnetic interference. Use Value: 1.6s watchdog period accommodates long sensor acquisition cycles; AEC-Q100 qualification supports extended field life in harsh factory environments. |
| Medical Infusion Pump Controller | Smart Energy Meter MCU |
|
Use Scenario: Battery-backed main controller in Class II medical device requiring fail-safe restart on power anomaly. IC Role / Device Role / Timing Role: Provides deterministic reset to Renesas RL78G13 during Li-ion battery voltage decay below 2.93V. Use Value: 5–12µA supply current extends battery runtime; guaranteed reset down to VCC = 1V enables safe shutdown before complete depletion. |
Use Scenario: Metrology SoC in ANSI C12.20-certified electricity meter operating in wide-temperature outdoor enclosures. IC Role / Device Role / Timing Role: Supervises STMicro STM32L4 MCU supply and detects firmware lockup via WDI toggling. Use Value: -40°C to +125°C operation ensures reliability across desert and arctic deployments; 2.93V threshold matches 3.3V LDO tolerance stack-up. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6318MHUK29CY+T | Bidirectional active-low reset output instead of active-high push/pull; includes internal 4.7kΩ pullup + active P-FET | Required for Motorola 68HC11 or other µPs with bidirectional reset pins needing fast rise-time under capacitive load | Select MAX6318MHUK29CY+T only when interfacing with legacy bidirectional-reset microcontrollers; otherwise MAX6318LHUK29CY+T simplifies design with direct drive. |
| TLV809E29DBVR | Single-function reset IC with 2.93V threshold and 200ms timeout; no watchdog or manual reset; SOT23-3 package | Suitable for cost-sensitive applications where watchdog and MR features are unnecessary | Choose TLV809E29DBVR only when watchdog monitoring and manual reset are omitted from system requirements; MAX6318LHUK29CY+T adds functional safety coverage. |
Compared with MAX6318MHUK29CY+T, MAX6318LHUK29CY+T offers simpler interface for modern push/pull-reset MCUs and eliminates need for external pullup; versus TLV809E29DBVR, it delivers critical watchdog supervision and MR flexibility essential for safety-critical embedded systems.
Availability
MAX6318LHUK29CY+T is available at Aetrix Electronics and suitable for automotive ECUs, industrial PLCs, medical infusion pumps, and smart energy meters requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for MAX6318LHUK29CY+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, mixed-signal, and power management ICs for demanding industrial, automotive, and communications applications.
The MAX6316–MAX6322 family was engineered specifically for microprocessor supervision in space-constrained, high-reliability systems-delivering factory-trimmed thresholds, multiple timeout options, and AEC-Q100 compliance in miniature SOT23 packages.
FAQ
What is the exact reset threshold voltage of MAX6318LHUK29CY+T and how tightly is it specified?
The MAX6318LHUK29CY+T has a factory-trimmed reset threshold of 2.93V, with tolerance of ±2.5% over the full operating temperature range (-40°C to +125°C). At +25°C, the specification tightens to ±1.5%, ensuring precise brownout detection for 3.3V systems without external calibration. This value is laser-trimmed during manufacturing and documented in Table 1 of the datasheet.
Does MAX6318LHUK29CY+T include a watchdog timer, and what is its timeout period?
Yes, MAX6318LHUK29CY+T includes a watchdog timer with a typical timeout period of 1.6 seconds. This value corresponds to the "Y" suffix in the ordering code and is factory-programmed. The timer resets on any rising or falling edge at the WDI pin and remains cleared while RESET is asserted. If WDI is left unconnected, the internal counter services the watchdog automatically.
What type of reset output does MAX6318LHUK29CY+T provide, and what are its drive capabilities?
MAX6318LHUK29CY+T provides an active-high push/pull reset output (pin 1). It sources current when driving high (VOH ≥ 0.8×VCC at ISOURCE = 500µA) and sinks current when driving low (VOL ≤ 0.3V at ISINK = 1.2mA for VCC ≥ 2.7V). This eliminates the need for external pullup resistors and ensures clean, rail-to-rail signaling compatible with most modern microcontrollers.
Is MAX6318LHUK29CY+T qualified for automotive applications?
Yes, MAX6318LHUK29CY+T is AEC-Q100 qualified (Grade 1: -40°C to +125°C), meeting the stress testing, reliability, and failure rate requirements for automotive electronic systems. Its qualification covers temperature cycling, humidity testing, and ESD robustness-making it suitable for engine control, body electronics, and ADAS modules where functional safety is critical.
How does the manual reset (MR) input function on MAX6318LHUK29CY+T?
The MR input on MAX6318LHUK29CY+T is active-low and internally pulled up to VCC via a 52kΩ resistor. Pulling MR low forces an immediate reset assertion, which remains active for the full 140ms reset timeout period after MR returns high. It accepts TTL/CMOS logic levels and rejects transients ≤100ns, enabling direct connection to momentary switches or GPIOs without external debouncing circuitry.
MAX6318LHUK29CY+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:
- 2.93V
- 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
MAX6318LHUK29CY+T FAQ
1.How can I place an order for MAX6318LHUK29CY+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6318LHUK29CY+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 MAX6318LHUK29CY+T reliable?
The price and inventory of MAX6318LHUK29CY+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6318LHUK29CY+T is usually 5 days.
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MAX6318LHUK29CY+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6318LHUK29CY+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 MAX6318LHUK29CY+T?
For technical support, including MAX6318LHUK29CY+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6318LHUK29CY+T requirements.
6.How does Aetrix verify that MAX6318LHUK29CY+T is sourced from the original manufacturer or authorized distributors?
All MAX6318LHUK29CY+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 MAX6318LHUK29CY+T meets industry standards.
7.What is the process for return or replacement of MAX6318LHUK29CY+T?
All MAX6318LHUK29CY+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6318LHUK29CY+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 MAX6318LHUK29CY+T part is unused and in its original packaging.
Return procedure for MAX6318LHUK29CY+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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