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Analog Devices Inc./Maxim Integrated MAX6318MHUK46CY-T
- Part No.:
- MAX6318MHUK46CY-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6318MHUK46CY-T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:4,479
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Product details
Overview
The MAX6318MHUK46CY-T from Maxim Integrated is a 5-pin SOT23 microprocessor supervisory circuit with active-low bidirectional reset output, 4.63V factory-trimmed reset threshold, 140ms minimum reset timeout, and 1.6s typical watchdog timeout. It interfaces directly with Motorola 68HC11-style bidirectional reset pins and supports brownout detection, manual reset, and watchdog monitoring in embedded control systems.
For engineers reviewing the MAX6318MHUK46CY-T datasheet, MAX6318MHUK46CY-T pinout, MAX6318MHUK46CY-T application, or MAX6318MHUK46CY-T equivalent, key selection criteria include bidirectional reset compatibility, guaranteed reset validity down to VCC = 1V, immunity to short negative VCC transients, and AEC-Q100 qualification for automotive-grade reliability.
Technical Context
This device implements a dual-stage reset generator with integrated watchdog timer and bidirectional reset interface logic. Its active pullup FET (in parallel with 4.7kΩ resistor) ensures RESET rises above 0.85×VCC within two external clock cycles-even with multiple devices and stray capacitance on the bus-enabling correct source-detection in Motorola 68HC11-class microcontrollers.
The internal voltage reference uses laser-trimmed resistors to achieve ±1.5% reset threshold accuracy at +25°C and ±2.5% over –40°C to +125°C. Watchdog timeout is factory-set to 1.6s (Y-suffix), cleared by any WDI edge, and disabled when WDI is left unconnected or three-stated.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.63V nominal (±1.5% at +25°C); enables reliable brownout detection for 5V systems with margin |
| Reset Timeout Period | 140ms minimum; ensures sufficient hold time for μP initialization after power-up or recovery |
| Watchdog Timeout | 1.6s typical (Y-suffix); provides robust software execution monitoring without excessive latency |
| Supply Current | 5–12µA at VCC = 3.6V; supports ultra-low-power battery-operated applications |
| Operating Temperature | –40°C to +125°C; qualified per AEC-Q100 Grade 1 for automotive under-hood use |
| Reset Output Type | Active-low bidirectional; integrates 4.7kΩ pullup + P-channel active pullup for fast rise-time compliance |
| VCC Range | 1.0V to 5.5V; guarantees valid reset assertion even during deep brownout conditions |
Pinout & Package
MAX6318MHUK46CY-T is housed in a RoHS-compliant 5-pin SOT23 package (package code U5+2A, outline 21-0057), optimized for space-constrained PCB layouts and reflow-compatible assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Bidirectional RESET | Active-low open-drain compatible output with integrated 4.7kΩ pullup + active P-FET; asserts reset when pulled low by μP or supervisor |
| 2 | GND | Ground reference for all internal circuitry and reset timing accuracy |
| 3 | MR (Manual Reset) | Active-low input with 52kΩ internal pullup; forces reset when pulled low; glitch-rejected (100ns) |
| 4 | WDI (Watchdog Input) | Edge-sensitive input; clears watchdog timer on rising/falling edges; disabled if left floating or three-stated |
| 5 | VCC | Supply input (1.0–5.5V); reset asserted when VCC falls below 4.63V; monitors system power integrity |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional reset interface | Enables Motorola 68HC11-compatible source discrimination without external pullup or timing compromises |
| Guaranteed reset validity to VCC = 1V | Ensures deterministic reset behavior during severe brownout, eliminating race conditions in low-VCC startup |
| Immunity to short negative VCC transients | Rejects ≤4µs, 100mV-under-threshold glitches-prevents spurious resets in noisy power environments |
| No external components required | Integrates precision voltage reference, watchdog timer, pullup resistor, and active pullup FET-reduces BOM count and layout area |
| AEC-Q100 qualified | Validated for automotive applications including engine control, body electronics, and ADAS subsystems |
Applications
| Automotive Engine Control Unit (ECU) | Industrial PLC I/O Module |
|---|---|
|
Use Scenario: Monitors 5V supply rail in diesel ECU exposed to load dump and cold-crank transients. IC Role / Device Role / Timing Role: Bidirectional reset supervisor ensuring correct reset source identification after watchdog timeout or brownout. Use Value: Prevents misdiagnosis of reset cause by enabling μP to distinguish self-initiated vs. external resets-critical for fault logging and fail-safe response. |
Use Scenario: Supervises power and software health in modular PLC backplane with multiple processors sharing reset bus. IC Role / Device Role / Timing Role: Bidirectional reset driver maintaining fast rise time (<500ns) despite 200pF total bus capacitance. Use Value: Eliminates need for external active pullup, reducing component count while guaranteeing 68HC11-compatible reset timing across temperature. |
| Medical Infusion Pump Controller | Smart Energy Meter MCU |
|
Use Scenario: Ensures safe restart after battery voltage sag during motor actuation in portable infusion pump. IC Role / Device Role / Timing Role: Brownout detector with 4.63V threshold and 140ms timeout, paired with 1.6s watchdog for firmware integrity. Use Value: Guarantees full μP reset before resuming drug delivery-meeting IEC 62304 safety requirements for Class C software. |
Use Scenario: Supervises metrology SoC in ANSI C12.20-certified electricity meter operating across –40°C to +85°C ambient. IC Role / Device Role / Timing Role: AEC-Q100-qualified supervisor providing reset assertion down to VCC = 1V during capacitor discharge events. Use Value: Maintains data integrity during power interruption by holding reset until stable supply returns-preventing EEPROM corruption. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6318LHUK46CY-T | Active-low push/pull reset output (not bidirectional); no internal active pullup FET | Requires external pullup for bidirectional μPs; unsuitable for 68HC11 source-discrimination | Select only for systems using standard CMOS reset inputs without bidirectional requirements |
| MAX6316MUK46CY-T | Same bidirectional output and 4.63V threshold, but 1ms reset timeout (A-suffix) instead of 140ms (C-suffix) | Insufficient hold time for slower μPs requiring >100ms initialization; may cause premature release | Choose only when fast reset deassertion is required and μP startup completes within 1ms |
Compared with MAX6318MHUK46CY-T, MAX6318LHUK46CY-T lacks bidirectional timing support for source-aware reset, while MAX6316MUK46CY-T's 1ms timeout risks incomplete μP initialization-making MAX6318MHUK46CY-T the optimal choice for 68HC11-based designs needing 140ms hold time and robust transient immunity.
Availability
MAX6318MHUK46CY-T is available at Aetrix Electronics and suitable for automotive engine control units, industrial PLC modules, and medical infusion pump controllers requiring stable component supply with AEC-Q100 assurance and long-term lifecycle support.
Supply support for MAX6318MHUK46CY-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 computing applications.
The MAX6316–MAX6322 family delivers integrated power-supply monitoring, watchdog, and manual reset functions in miniature SOT23 packages-targeting space- and reliability-critical embedded systems.
FAQ
What is the reset output configuration of the MAX6318MHUK46CY-T?
The MAX6318MHUK46CY-T features an active-low bidirectional reset output designed specifically for microprocessors like the Motorola 68HC11. It integrates both a 4.7kΩ pullup resistor and an active P-channel pullup FET to ensure rapid rise time-even with multiple devices on the reset bus-enabling accurate reset source identification. This configuration eliminates the need for external pullup components while maintaining strict timing compliance.
Does the MAX6318MHUK46CY-T require external components for basic operation?
No, the MAX6318MHUK46CY-T operates autonomously without external components. It integrates a precision laser-trimmed voltage reference, watchdog timer, 52kΩ MR pullup resistor, 4.7kΩ RESET pullup, and active P-FET pullup. Only decoupling capacitance (e.g., 0.1µF near VCC) is recommended for noise immunity-no resistors, capacitors, or diodes are needed for core supervisory functionality.
What is the significance of the "MH" suffix in MAX6318MHUK46CY-T?
The "MH" in MAX6318MHUK46CY-T denotes two key attributes: "M" indicates the bidirectional reset output type, and "H" specifies the 4.63V reset threshold voltage. This matches Table 1 and Table 2 in the datasheet, where "H" corresponds to VRST = 4.63V (±1.5% at +25°C), and "M" identifies the MAX6318M variant with bidirectional RESET functionality-distinct from "L" (push/pull) or "P" (open-drain) variants.
How does the MAX6318MHUK46CY-T handle VCC transients during operation?
The MAX6318MHUK46CY-T is immune to short negative-going VCC transients: it ignores pulses ≤4µs duration that dip up to 100mV below the 4.63V reset threshold. This prevents false resets caused by switching noise or load dump events. An optional 0.1µF ceramic capacitor placed close to the VCC pin further enhances immunity-ensuring robust operation in electrically harsh automotive and industrial environments.
Is the MAX6318MHUK46CY-T suitable for automotive applications?
Yes, the MAX6318MHUK46CY-T is AEC-Q100 qualified (Grade 1: –40°C to +125°C), making it suitable for automotive applications including engine control units, body control modules, and ADAS subsystems. Its guaranteed operation down to VCC = 1V, 4.63V reset threshold for 5V rail monitoring, and immunity to electrical transients align with ISO 7637-2 and ISO 16750-2 requirements for vehicle electronics.
MAX6318MHUK46CY-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:
- 4.63V
- Output:
- Push-Pull, Bi-Directional
- 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
MAX6318MHUK46CY-T FAQ
1.How can I place an order for MAX6318MHUK46CY-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6318MHUK46CY-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 MAX6318MHUK46CY-T reliable?
The price and inventory of MAX6318MHUK46CY-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6318MHUK46CY-T is usually 5 days.
3.What payment methods are accepted for MAX6318MHUK46CY-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6318MHUK46CY-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6318MHUK46CY-T?
MAX6318MHUK46CY-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6318MHUK46CY-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 MAX6318MHUK46CY-T?
For technical support, including MAX6318MHUK46CY-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6318MHUK46CY-T requirements.
6.How does Aetrix verify that MAX6318MHUK46CY-T is sourced from the original manufacturer or authorized distributors?
All MAX6318MHUK46CY-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 MAX6318MHUK46CY-T meets industry standards.
7.What is the process for return or replacement of MAX6318MHUK46CY-T?
All MAX6318MHUK46CY-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6318MHUK46CY-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 MAX6318MHUK46CY-T part is unused and in its original packaging.
Return procedure for MAX6318MHUK46CY-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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