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Analog Devices Inc./Maxim Integrated MAX6394US480D2+T
- Part No.:
- MAX6394US480D2+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- TO-253-4, TO-253AA
- Datasheet:
-
MAX6394US480D2+T.pdf
- Description:
- IC MPU/RESET CIRC 4.80V SOT143-4
- Quantity:
- Payment:
- Shipping:
Inventory:2,500
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Product details
Overview
MAX6394US480D2+T from Maxim Integrated is a low-power CMOS microprocessor supervisory circuit that monitors VCC supply voltage and asserts an active-low open-drain RESET signal when VCC drops below 4.800V (±0.6% at +25°C) or when manual reset (MR) is asserted. It features a factory-set 14ms minimum reset timeout period, 5µA typical supply current at +25°C, and operates across –40°C to +125°C for critical μP power monitoring in portable equipment.
For engineers reviewing the MAX6394US480D2+T datasheet, MAX6394US480D2+T pinout, MAX6394US480D2+T application, or MAX6394US480D2+T equivalent, key selection criteria include its ±1.0% reset threshold accuracy over temperature, SOT143-4 package compatibility, open-drain RESET output capable of pull-up beyond VCC, and AEC-Q100 qualification for automotive-grade reliability.
Technical Context
The MAX6394US480D2+T implements a precision voltage-monitoring comparator with laser-trimmed internal resistors to set the 4.800V reset threshold and a monolithic timer circuit to enforce a guaranteed minimum 14ms reset timeout after VCC recovery or MR deassertion. Its reset assertion logic is fully static-no external components required.
It uses an open-drain n-channel MOSFET for RESET output, enabling level-shifting across supplies up to +6.0V, and includes an internal 63kΩ MR pullup resistor with 100ns glitch rejection. The device is immune to transients ≤100ns and supports VCC ramp rates up to 100V/µs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.800V ±0.6% at +25°C; ±1.0% from –40°C to +125°C - ensures reliable brownout detection across full industrial temperature range |
| Reset Timeout Period | 14ms (min), 28ms (typ), 40ms (max) - guarantees sufficient processor initialization time after power recovery |
| Supply Current | 5µA typ at +25°C, 15µA max at +125°C - enables ultra-low-power operation in battery-backed systems |
| Operating Voltage Range | VCC = 1.0V to 5.5V - supports wide input supply range including single-cell Li-ion and 3.3V/5V rails |
| RESET Output Type | Open-drain, rated to 6.0V - allows pull-up to higher-voltage rail (e.g., 5V) while monitoring 3.3V VCC |
| MR Input Logic | Active-low with internal 63kΩ pullup - eliminates need for external pullup; accepts 1µs minimum pulse width |
| Temperature Range | –40°C to +125°C - qualified for under-hood automotive and industrial embedded environments |
Pinout & Package
SOT143-4 (4-pin, 1.3mm × 2.1mm, 0.95mm height) surface-mount package with gull-wing leads and exposed pad not connected internally.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (GND) | Ground reference | Return path for internal circuitry and RESET sink current; must be low-impedance connection to system ground plane |
| 2 (RESET) | Active-low open-drain output | Drives low during reset; requires external pullup (e.g., 10kΩ) to defined logic-high voltage; can interface across supply domains |
| 3 (MR) | Manual reset input | Logic-low assertion forces immediate reset; internal 63kΩ pullup allows direct switch-to-ground connection without external resistor |
| 4 (VCC) | Supply voltage and monitor input | Power source and monitored rail; internal voltage divider compares against 4.800V threshold; valid down to 1.0V |
Key Features
| Feature | Design Value |
|---|---|
| Precision factory-trimmed threshold | 4.800V with ±0.6% tolerance at +25°C enables accurate power-rail supervision without calibration |
| Four programmable timeout options | 14ms minimum timeout (D2 variant) meets boot-time requirements for mid-speed microcontrollers and FPGAs |
| Open-drain RESET with >VCC capability | Supports level-shifted reset signaling-e.g., monitoring 3.3V VCC while pulling RESET to 5V logic domain |
| Immunity to short VCC transients | Rejects glitches ≤100ns, reducing false resets in electrically noisy environments like motor control or automotive systems |
| AEC-Q100 qualification | Validated for automotive applications per Grade 0 (–40°C to +125°C), supporting safety-critical ECU designs |
Applications
| Computers | Controllers |
|---|---|
Use Scenario: Monitoring 5V or 3.3V supply rails in embedded PCs and industrial HMIs during cold start and brownout events. IC Role / Device Role / Timing Role: Supervisory IC asserting active-low RESET to x86 or ARM-based processors until stable VCC is confirmed. Use Value: Prevents code execution errors by holding processor in reset until VCC exceeds 4.800V and remains stable for ≥14ms. | Use Scenario: Power supervision in PLC I/O modules where supply integrity directly affects field-device communication reliability. IC Role / Device Role / Timing Role: Dedicated reset generator ensuring deterministic controller startup after AC/DC converter output stabilizes. Use Value: Eliminates need for RC-based reset circuits, improving long-term accuracy and reducing BOM count. |
| Intelligent Instruments | Critical μP and μC Power Monitoring |
Use Scenario: Battery-powered handheld test equipment requiring precise low-voltage cutoff before data corruption occurs. IC Role / Device Role / Timing Role: Voltage supervisor triggering controlled shutdown sequence when main Li-ion cell drops below 4.8V. Use Value: Leverages ±1.0% threshold accuracy over –40°C to +125°C to maintain consistent cutoff across operating environments. | Use Scenario: Reset assurance in medical diagnostic devices where firmware integrity is safety-critical. IC Role / Device Role / Timing Role: Primary reset source for ARM Cortex-M7 MCU, with MR input tied to emergency stop button. Use Value: Internal 63kΩ MR pullup and 100ns glitch rejection prevent spurious resets during ESD events or cable disconnects. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLV803EC48DBZR | 4.8V threshold, 240ms timeout (fixed), SOT-23-3 package, no MR input | Lacks manual reset functionality and offers longer timeout; suitable only for basic power-on reset without user intervention | Select if MR is unnecessary and board space favors 3-pin SOT-23; verify 240ms timeout aligns with processor boot timing |
| ADM6315-48D2ARTZ-RL | 4.8V threshold, 14ms timeout, SOT-23-4 package, no AEC-Q100 qualification | Same timeout and threshold but lacks automotive qualification; thermal resistance differs due to package variant | Prefer for cost-sensitive industrial designs where AEC-Q100 is not mandated; confirm layout compatibility with SOT-23-4 footprint |
Compared with TLV803EC48DBZR and ADM6315-48D2ARTZ-RL, the MAX6394US480D2+T uniquely combines AEC-Q100 qualification, MR input with internal pullup, and SOT143-4 packaging-making it the only option among the three validated for automotive reset-critical ECUs requiring manual override capability.
Availability
MAX6394US480D2+T is available at Aetrix Electronics and suitable for computers, controllers, and intelligent instruments requiring stable component supply, automotive-grade reliability, and precise 4.8V supply monitoring.
Supply support for MAX6394US480D2+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 industrial, automotive, communications, and computing applications.
The MAX6394 family delivers high-accuracy, low-power microprocessor supervisory circuits optimized for systems demanding guaranteed reset behavior across extreme temperatures and transient conditions.
FAQ
What is the exact reset threshold voltage for MAX6394US480D2+T?
The MAX6394US480D2+T has a factory-trimmed nominal reset threshold of 4.800V, with ±0.6% accuracy at +25°C and ±1.0% accuracy over the full –40°C to +125°C operating range. This value is laser-trimmed during production and verified per Tables 1 and 2 in the official datasheet. The "480" suffix explicitly denotes the 4.800V threshold option.
Does MAX6394US480D2+T support manual reset functionality?
Yes, MAX6394US480D2+T includes a dedicated MR (manual reset) input on Pin 3. A logic-low pulse ≥1µs on MR forces immediate reset assertion, and RESET remains active for the full 14ms timeout period after MR returns high. An internal 63kΩ pullup resistor allows MR to be left unconnected if unused, eliminating external components.
Can the RESET output of MAX6394US480D2+T be pulled up to a voltage higher than VCC?
Yes, the MAX6394US480D2+T features an open-drain RESET output rated to 6.0V, allowing it to be pulled up to any voltage between 0V and +6.0V-even higher than the monitored VCC rail. This enables level-shifting applications, such as using a 5V pullup while monitoring a 3.3V VCC supply, as confirmed in the Pin Description and Absolute Maximum Ratings sections.
What is the guaranteed minimum reset timeout period for MAX6394US480D2+T?
The MAX6394US480D2+T has a guaranteed minimum reset timeout period of 14ms, corresponding to the "D2" suffix. Electrical Characteristics specify 14ms (min), 28ms (typ), and 40ms (max) for this variant. This interval begins when VCC rises above 4.800V or when MR is deasserted, and ensures sufficient time for microprocessor initialization before release.
Is MAX6394US480D2+T qualified for automotive applications?
Yes, MAX6394US480D2+T is AEC-Q100 qualified (Grade 0, –40°C to +125°C), as explicitly stated in the Benefits and Features section and Ordering Information table. This qualification covers stress testing for temperature cycling, humidity, ESD, and other automotive reliability requirements, making it suitable for engine control units, ADAS modules, and other safety-relevant vehicle systems.
MAX6394US480D2+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- TO-253-4, TO-253AA
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 4.8V
- Output:
- Open Drain or Open Collector
- Reset:
- Active Low
- Reset Timeout:
- 14ms Minimum
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-143-4
MAX6394US480D2+T FAQ
1.How can I place an order for MAX6394US480D2+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6394US480D2+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 MAX6394US480D2+T reliable?
The price and inventory of MAX6394US480D2+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6394US480D2+T is usually 5 days.
3.What payment methods are accepted for MAX6394US480D2+T?
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4.How is shipping managed for MAX6394US480D2+T?
MAX6394US480D2+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6394US480D2+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 MAX6394US480D2+T?
For technical support, including MAX6394US480D2+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6394US480D2+T requirements.
6.How does Aetrix verify that MAX6394US480D2+T is sourced from the original manufacturer or authorized distributors?
All MAX6394US480D2+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 MAX6394US480D2+T meets industry standards.
7.What is the process for return or replacement of MAX6394US480D2+T?
All MAX6394US480D2+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6394US480D2+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 MAX6394US480D2+T part is unused and in its original packaging.
Return procedure for MAX6394US480D2+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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