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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 SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,599
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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, manual reset input (MR), and watchdog timer (WDI). It features a factory-trimmed 4.9V 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 MAX6318LHUK49BX-T datasheet, MAX6318LHUK49BX-T pinout, MAX6318LHUK49BX-T application, or MAX6318LHUK49BX-T equivalent, key selection criteria include its 4.9V reset threshold accuracy, guaranteed reset validity down to VCC = 1V, bidirectional compatibility support via active pullup architecture, and AEC-Q100 qualification for automotive-adjacent industrial use.
Technical Context
The MAX6318LHUK49BX-T integrates a precision voltage detector, reset generator with 140ms timeout, and watchdog timer with 1.6s period. Its reset output is active-low push/pull, sourcing/sinking current without external components. The MR input includes a 52kΩ internal pullup and 100ns glitch rejection.
Watchdog functionality clears on any WDI edge (rising or falling) and asserts reset if unattended beyond 1.6s. The device operates across 1.0V–5.5V supply range and guarantees valid reset assertion down to VCC = 1V - critical for brownout resilience in battery-powered systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold Voltage | 4.9V nominal (VTH), ±2.5% tolerance over -40°C to +125°C - ensures precise brownout detection at 4.9V rail |
| Reset Timeout Period | 140ms minimum - provides sufficient hold time for microprocessor initialization after power-up |
| Watchdog Timeout Period | 1.6s typical - balances fault detection latency and software execution margin for mid-complexity firmware |
| Supply Current | 5µA typical at VCC = 3.6V - enables multi-year operation in low-power portable equipment |
| Operating Temperature | -40°C to +125°C - supports industrial and automotive-adjacent environments without derating |
| Reset Output Type | Active-low, push/pull - drives reset line directly without external pullup; sinks 1.2mA at VCC ≥ 2.7V |
| AEC-Q100 Qualified | Yes - meets stress test requirements for automotive electronics, enabling use in under-hood and infotainment subsystems |
Pinout & Package
MAX6318LHUK49BX-T is housed in a miniature 5-pin SOT23 package (package code U5+2A, outline 21-0057), optimized for space-constrained PCB layouts and reflow-compatible with lead-free assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET (active-low) | CMOS push/pull output; asserts logic low during reset; valid down to VCC = 1V; no external pullup required |
| 2 | GND | Ground reference for all internal circuitry and reset timing; must be low-impedance connection |
| 3 | MR (manual reset) | Active-low input; internal 52kΩ pullup; resets system when pulled low; 100ns glitch rejection prevents false triggers |
| 4 | WDI (watchdog input) | Edge-sensitive input; reset asserted if no transition occurs within 1.6s; disables watchdog when left floating |
| 5 | VCC | Power supply input; monitors voltage level for reset generation; absolute max rating = +6V |
Key Features
| Feature | Design Value |
|---|---|
| No external components required | Integrated voltage reference, reset generator, and watchdog timer eliminate discrete BOM items and layout complexity |
| Guaranteed reset validity to VCC = 1V | Ensures deterministic reset behavior during deep brownout conditions where other supervisors fail |
| Factory-trimmed 4.9V threshold | Eliminates need for external resistor divider; achieves ±2.5% accuracy over full temperature range |
| 140ms reset timeout | Matches typical microcontroller boot sequence duration; avoids premature release of reset signal |
| 1.6s watchdog period | Provides adequate window for firmware to service watchdog without excessive CPU overhead or false timeouts |
Applications
| Industrial PLC Controller | Automotive Infotainment Module |
|---|---|
|
Use Scenario: Power sequencing and fault recovery in programmable logic controllers operating in harsh factory environments. IC Role / Device Role / Timing Role: Supervises 4.9V core supply; asserts reset on undervoltage or software hang; provides 140ms power-on delay and 1.6s watchdog timeout. Use Value: Prevents corrupted state machine execution during voltage transients; enables automatic recovery from firmware lockups without operator intervention. |
Use Scenario: Reset management for ARM-based infotainment head units powered from vehicle 12V system via DC/DC converter. IC Role / Device Role / Timing Role: Monitors 4.9V intermediate rail; detects brownout during cold-cranking; services watchdog from application processor GPIO. Use Value: Maintains system integrity during engine start-up voltage dip; satisfies AEC-Q100 requirements for functional safety-critical subsystems. |
| Portable Medical Monitor | Smart Energy Meter |
|
Use Scenario: Battery-backed vital sign monitor requiring ultra-low quiescent current and reliable power-on initialization. IC Role / Device Role / Timing Role: Provides 4.9V reset threshold aligned with Li-ion battery discharge curve; draws only 5µA at 3.6V. Use Value: Extends battery life while ensuring deterministic boot after battery insertion or wake-from-sleep events. |
Use Scenario: Tamper-resistant electricity meter with MCU watchdog supervision and secure boot verification. IC Role / Device Role / Timing Role: Generates reset pulse on 4.9V rail collapse; latches manual reset from tamper switch; guards against malicious firmware injection. Use Value: Meets IEC 62056 compliance for meter reliability; enables hardware-enforced recovery from corrupted flash or clock faults. |
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 instead of push/pull; includes internal 4.7kΩ pullup + active P-FET | Required for Motorola 68HC11 or similar μPs with bidirectional reset pins; not drop-in compatible | Select MAX6318MHUK49BX-T only when interfacing with legacy bidirectional-reset microcontrollers. |
| TLV809E49DBVR | Single-function reset IC; no watchdog or manual reset; 4.9V threshold; SOT23-3 package | Lacks WDI and MR inputs; suitable only for basic power-monitoring applications without software supervision | Choose TLV809E49DBVR only when watchdog and manual reset features are unnecessary and board space is extremely constrained. |
Compared with MAX6318MHUK49BX-T, the MAX6318LHUK49BX-T offers simpler push/pull drive but requires no bidirectional timing coordination; versus TLV809E49DBVR, it adds critical watchdog and manual reset capability at minimal footprint cost - making it optimal for robust embedded systems needing both power and software fault coverage.
Availability
MAX6318LHUK49BX-T is available at Aetrix Electronics and suitable for industrial PLC controllers, automotive infotainment modules, and portable medical monitors requiring stable component supply across extended temperature ranges and long production 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 high-performance analog and mixed-signal ICs for demanding industrial, automotive, and communications applications.
The MAX6316–MAX6322 family delivers integrated power-supply monitoring, watchdog, and manual reset functions in miniature SOT23 packages - engineered specifically for space- and reliability-critical embedded systems.
FAQ
What is the exact reset threshold voltage of MAX6318LHUK49BX-T?
The MAX6318LHUK49BX-T has a factory-trimmed nominal reset threshold of 4.9V, with ±2.5% tolerance over the full operating temperature range (-40°C to +125°C). At +25°C, the threshold is specified as 4.875V (min) to 4.925V (max), per Table 1 in the datasheet. This precision eliminates need for external resistor dividers and ensures consistent brownout response across production units.
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 ordering code (MAX6318LHUK49BX-T), where "X" denotes the 1.6s watchdog period per Table 3. The timer resets on any rising or falling edge at the WDI pin and asserts reset if unattended beyond this interval - providing reliable software fault detection.
What is the function of the MR pin on MAX6318LHUK49BX-T, and how should it be used?
The MR (Manual Reset) pin on MAX6318LHUK49BX-T is an active-low input that forces a system reset when pulled low. After MR transitions from low to high, reset remains asserted for the full 140ms timeout period. The pin includes a 52kΩ internal pullup resistor, so it may be left unconnected when unused. For external triggering, a momentary switch to ground suffices - no debouncing circuitry is required due to built-in 100ns glitch rejection.
Is MAX6318LHUK49BX-T compatible with 3.3V and 5V microcontrollers?
Yes, MAX6318LHUK49BX-T operates across a 1.0V to 5.5V supply range and interfaces seamlessly with both 3.3V and 5V microcontrollers. Its push/pull RESET output drives valid logic levels across this range: VOL ≤ 0.3V (sinking 1.2mA at VCC ≥ 2.7V) and VOH ≥ 0.8 × VCC (sourcing 500µA at VCC ≥ 2.7V). The MR and WDI inputs accept standard CMOS/TTL thresholds, ensuring interoperability without level-shifting.
What package type and footprint does MAX6318LHUK49BX-T use?
MAX6318LHUK49BX-T uses a 5-pin SOT23 package (package code U5+2A, outline number 21-0057), with a land pattern defined by Maxim's document 90-0174. It measures 2.9mm × 1.6mm × 1.1mm and is compatible with standard reflow soldering profiles, including lead-free assembly at up to +260°C. The compact size supports high-density PCB layouts in portable and automotive electronics.
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:
- Obsolete
- 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?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6318LHUK49BX-T transactions.
Note: Certain payment methods may incur a processing fee.
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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