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Analog Devices Inc./Maxim Integrated MAX6318LHUK49BX+T
- Part No.:
- MAX6318LHUK49BX+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6318LHUK49BX+T.pdf
- Description:
- IC MPU/RESET CIRC 4.90V SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,500
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Product details
Overview
MAX6318LHUK49BX+T from Maxim Integrated is a 5-pin SOT23 microprocessor supervisory circuit with active-low push/pull reset output, 4.9V factory-trimmed reset threshold (±2.5% over -40°C to +125°C), 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 MAX6318LHUK49BX+T datasheet, MAX6318LHUK49BX+T pinout, MAX6318LHUK49BX+T application, or MAX6318LHUK49BX+T equivalent, key selection criteria include its guaranteed reset validity down to VCC = 1V, immunity to short negative VCC transients (<4µs at 100mV under threshold), bidirectional reset compatibility support (via internal active pullup), and AEC-Q100 qualification for automotive-adjacent industrial use.
Technical Context
The MAX6318LHUK49BX+T integrates a precision voltage detector, programmable reset timer, and watchdog timer with edge-triggered WDI input. Its reset generator asserts active-low RESET when VCC falls below 4.9V (±2.5%), after MR deassertion, or upon WDI timeout - holding RESET low for ≥140ms after VCC recovery.
It features a push/pull output stage capable of sourcing/sinking ≥500µA at VCC ≥ 2.7V (VOH ≥ 0.8×VCC, VOL ≤ 0.3V), with guaranteed logic-level validity down to VCC = 1V. The watchdog circuit clears on any WDI edge (≥50ns pulse width) and times out after 1.6s if unserviced.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.9V nominal (±2.5% over -40°C to +125°C); ensures reliable detection of 4.9V supply brownout |
| Reset Timeout Period | 140ms minimum; guarantees processor remains held in reset long enough for stable power rail recovery |
| Watchdog Timeout | 1.6s typical; provides robust software hang detection without excessive system interruption |
| Supply Current | 5–12µA at VCC = 3.6V; enables ultra-low-power operation in battery-backed or portable systems |
| Operating Temperature | -40°C to +125°C; supports deployment in automotive engine compartments and industrial control enclosures |
| VCC Range | 1.0V to 5.5V; allows valid reset signaling even during deep brownout or partial power loss |
| Reset Output Type | Active-low, push/pull; eliminates need for external pullup and drives standard CMOS inputs directly |
Pinout & Package
MAX6318LHUK49BX+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-low push/pull reset output; sinks ≥1.2mA at VCC ≥ 2.7V, sources ≥500µA; 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; accepts TTL/CMOS logic levels |
| 4 | WDI | Watchdog input; edge-sensitive (rising/falling); resets watchdog timer on each transition; disable by leaving floating |
| 5 | VCC | Supply input; monitored for reset threshold violation; absolute max rating = +6V |
Key Features
| Feature | Design Value |
|---|---|
| No external components required | Integrated voltage reference, timing capacitors, and pullup resistors eliminate BOM cost and layout area |
| Guaranteed reset validity to VCC = 1V | Ensures deterministic reset behavior during severe brownout, preventing undefined MCU states |
| Immunity to short negative VCC transients | Rejects <4µs glitches at 100mV below threshold - avoids spurious resets from switching noise or ESD |
| AEC-Q100 qualified | Validated for automotive-grade reliability (Grade 1: -40°C to +125°C junction) |
| Factory-trimmed precision | 4.9V threshold tolerance ±2.5% across full temperature range - no calibration needed in production |
Applications
| Industrial PLC Controller | Automotive Body Control Module |
|---|---|
|
Use Scenario: Monitors 5V system rail in programmable logic controller during cold-cranking and load-dump events. IC Role / Device Role / Timing Role: Primary VCC supervisor asserting active-low reset to ARM Cortex-M7 MCU during brownout. Use Value: 140ms reset hold time prevents partial firmware execution; AEC-Q100 qualification ensures field reliability in under-hood environments. |
Use Scenario: Provides fail-safe reset to microcontroller managing door locks, lighting, and window motors. IC Role / Device Role / Timing Role: Dual-function supervisor: detects 4.9V battery rail collapse and monitors software liveness via WDI. Use Value: 1.6s watchdog timeout catches firmware hangs without compromising response to critical safety events. |
| Portable Medical Monitor | Smart Energy Meter |
|
Use Scenario: Ensures clean boot sequence in battery-powered ECG monitor with dual 3.3V/5V rails. IC Role / Device Role / Timing Role: Resets main application MCU on VCC undervoltage and validates software health via WDI polling. Use Value: 5–12µA supply current extends battery life; 4.9V threshold matches Li-ion charger output regulation point. |
Use Scenario: Supervises metrology SoC in ANSI C12.20-certified electricity meter exposed to grid transients. IC Role / Device Role / Timing Role: Detects AC/DC converter output collapse and provides glitch-immune reset during lightning-induced surges. Use Value: Immunity to <4µs VCC transients prevents false resets during high-energy line disturbances. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6318MHUK49BX+T | Bidirectional active-low RESET output (not push/pull); includes internal 4.7kΩ pullup + active P-FET | Required for Motorola 68HC11-style bidirectional reset buses; not drop-in compatible with push/pull designs | Select only when interfacing with µPs requiring bidirectional reset handshaking (e.g., legacy HC11 derivatives) |
| TPS3808G33DBVR | 3.3V fixed reset threshold; 200ms reset timeout; no watchdog function; SOT23-6 package | Lacks watchdog monitoring; suitable only for basic power-on reset where software supervision is handled externally | Choose when watchdog capability is unnecessary and 3.3V threshold aligns with system rail; requires PCB redesign (6-pin vs 5-pin) |
Compared with MAX6318MHUK49BX+T, the MAX6318LHUK49BX+T offers direct push/pull drive without bus contention concerns; versus TPS3808G33DBVR, it adds watchdog supervision and tighter 4.9V threshold matching for 5V-system brownout detection - at the cost of higher design complexity for non-watchdog use cases.
Availability
MAX6318LHUK49BX+T is available at Aetrix Electronics and suitable for industrial PLC controllers, automotive body control modules, portable medical monitors, and smart energy meters requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for MAX6318LHUK49BX+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 extended temperature performance.
The MAX6316–MAX6322 family delivers compact, factory-trimmed supervisory circuits for microprocessor reset and watchdog functions in space-constrained, mission-critical embedded systems.
FAQ
What is the exact reset threshold voltage of MAX6318LHUK49BX+T and how tightly is it specified?
The MAX6318LHUK49BX+T has a factory-trimmed nominal reset threshold of 4.900V, with tolerance of ±2.5% over the full operating temperature range (-40°C to +125°C). At +25°C, the threshold is specified as 4.874V (min) to 4.974V (max), per Table 1 in the datasheet. This precision eliminates need for external resistor dividers or calibration.
Does MAX6318LHUK49BX+T include a watchdog timer, and what is its timeout period?
Yes, MAX6318LHUK49BX+T includes a watchdog timer with a typical timeout period of 1.6 seconds. This value corresponds to the "Y" suffix in the part number (MAX6318LHUK49BX+T → X = watchdog Y = 1.6s). The timer clears on any rising or falling edge at the WDI pin and asserts reset if unserviced for the full timeout duration.
Can MAX6318LHUK49BX+T operate reliably during deep brownout conditions?
Yes, MAX6318LHUK49BX+T guarantees valid reset output down to VCC = 1.0V. Its push/pull RESET output maintains logic-low and logic-high levels (VOL ≤ 0.3V, VOH ≥ 0.8×VCC) even at this low supply voltage, ensuring deterministic MCU reset behavior during severe undervoltage events before complete power loss.
What is the function of the WDI pin on MAX6318LHUK49BX+T, and how should it be driven?
The WDI (Watchdog Input) pin on MAX6318LHUK49BX+T is edge-sensitive: any rising or falling transition resets the 1.6s watchdog timer. It must be toggled periodically by firmware - typically via GPIO - with pulse width ≥50ns. Leaving WDI unconnected disables the watchdog feature, causing internal servicing at ~7/8 of the timeout period.
Is MAX6318LHUK49BX+T compatible with bidirectional reset microcontrollers like the Motorola 68HC11?
No, MAX6318LHUK49BX+T features an active-low push/pull RESET output, not a bidirectional one. For 68HC11 compatibility, use MAX6318MHUK49BX+T instead, which implements bidirectional reset with integrated active pullup. Swapping these parts requires PCB layout change and firmware reset-handshake validation.
MAX6318LHUK49BX+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:
- 4.9V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active High/Active Low
- Reset Timeout:
- 20ms Minimum
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
MAX6318LHUK49BX+T FAQ
1.How can I place an order for MAX6318LHUK49BX+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6318LHUK49BX+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 MAX6318LHUK49BX+T reliable?
The price and inventory of MAX6318LHUK49BX+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6318LHUK49BX+T is usually 5 days.
3.What payment methods are accepted for MAX6318LHUK49BX+T?
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4.How is shipping managed for MAX6318LHUK49BX+T?
MAX6318LHUK49BX+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6318LHUK49BX+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 MAX6318LHUK49BX+T?
For technical support, including MAX6318LHUK49BX+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6318LHUK49BX+T requirements.
6.How does Aetrix verify that MAX6318LHUK49BX+T is sourced from the original manufacturer or authorized distributors?
All MAX6318LHUK49BX+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 MAX6318LHUK49BX+T meets industry standards.
7.What is the process for return or replacement of MAX6318LHUK49BX+T?
All MAX6318LHUK49BX+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6318LHUK49BX+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 MAX6318LHUK49BX+T part is unused and in its original packaging.
Return procedure for MAX6318LHUK49BX+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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